{ "document": { "aggregate_severity": { "text": "Low" }, "category": "csaf_security_advisory", "csaf_version": "2.0", "distribution": { "text": "TuxCare License Agreement", "tlp": { "label": "WHITE", "url": "https://www.first.org/tlp/" } }, "lang": "en", "notes": [ { "category": "legal_disclaimer", "text": "This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Cloud Linux Inc. and provide a link to the original.", "title": "Terms of Use" }, { "category": "details", "text": "CVE-2024-33655: add the upstream wait-limit and discard-timeout mechanism\n so accumulated recursion replies can no longer be released as a pulsing\n burst (DNSBomb), including every upstream follow-up to that mechanism:\n discard only UDP replies and never a reply on an open stream connection,\n clear the HTTP/2 stream back-pointer on the drop paths, account discarded\n replies in mesh num_reply_addrs, and fix CVE-2026-56444 in the\n serve-expired discard path\n- CVE-2024-43167: NULL-check the first forward stub name in ub_ctx_set_fwd()\n to prevent a NULL pointer dereference in libunbound, and reject a\n forward-zone, stub-zone or view without a name at config parse time so no\n name-less object reaches the daemon\n- CVE-2026-42955: clamp the cached TTL of parent-side A/AAAA glue as well as\n NS records so a client query can no longer renew a ghost domain delegation\n- CVE-2026-46582: keep a secure wildcard RRset out of the rrset cache until\n the NSEC wildcard proof completes, preventing poisoning via the\n serve-expired reply path\n- CVE-2026-50243: skip the response-ip/RPZ rewrite for BOGUS answers so a\n spoofed DNSSEC-protected answer is no longer redirected as INSECURE\n- CVE-2026-55708: enter the default-protected local zones when\n unbound-control view_local_data creates a view-specific local zone tree", "title": "Details" } ], "publisher": { "category": "vendor", "contact_details": "https://tuxcare.com/contact/", "name": "TuxCare", "namespace": "https://tuxcare.com/" }, "references": [ { "category": "self", "summary": "https://cve.tuxcare.com/els/releases/CLSA-2026:1786637650", "url": "https://cve.tuxcare.com/els/releases/CLSA-2026:1786637650" }, { "category": "self", "summary": "Canonical URL", "url": "https://security.tuxcare.com/csaf/v2/els_os/almalinux9.2esu/advisories/2026/clsa-2026_1786637650.json" } ], "tracking": { "current_release_date": "2026-08-13T16:15:21Z", "generator": { "date": "2026-08-13T16:15:21Z", "engine": { "name": "pyCSAF" } }, "id": "CLSA-2026:1786637650", "initial_release_date": "2026-08-13T16:15:21Z", "revision_history": [ { "date": "2026-08-13T16:15:21Z", "number": "1", "summary": "Initial version" } ], "status": "final", "version": "1" }, "title": "unbound: Fix of 6 CVEs" }, "product_tree": { "branches": [ { "branches": [ { "branches": [ { "category": "product_name", "name": "AlmaLinux 9.2", "product": { "name": "AlmaLinux 9.2", "product_id": "AlmaLinux-9.2", "product_identification_helper": { "cpe": "cpe:2.3:o:almalinux:almalinux:9.2:*:*:*:*:*:*:*" } } } ], "category": "product_family", "name": "AlmaLinux" } ], "category": "vendor", "name": "AlmaLinux OS Foundation" }, { "branches": [ { "branches": [ { "category": "product_version", "name": 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] }, "vulnerabilities": [ { "cve": "CVE-2024-43167", "cwe": { "id": "CWE-476", "name": "NULL Pointer Dereference" }, "notes": [ { "category": "description", "text": "DISPUTE NOTE: this issue does not pose a security risk as it (according to analysis by the original software developer, NLnet Labs) falls within the expected functionality and security controls of the application. Red Hat has made a claim that there is a security risk within Red Hat products. NLnet Labs has no further information about the claim, and suggests that affected Red Hat customers refer to available Red Hat documentation or support channels. ORIGINAL DESCRIPTION: A NULL pointer dereference flaw was found in the ub_ctx_set_fwd function in Unbound. This issue could allow an attacker who can invoke specific sequences of API calls to cause a segmentation fault. When certain API functions such as ub_ctx_set_fwd and ub_ctx_resolvconf are called in a particular order, the program attempts to read from a NULL pointer, leading to a crash. This issue can result in a denial of service by causing the application to terminate unexpectedly.", "title": "Vulnerability description" }, { "category": "general", "text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.", "title": "CVSS score applicability" } ], "product_status": { "fixed": [ "AlmaLinux-9.2:python3-unbound-0:1.16.2-3.el9_2.tuxcare.els14.x86_64", "AlmaLinux-9.2:unbound-0:1.16.2-3.el9_2.tuxcare.els14.x86_64", "AlmaLinux-9.2:unbound-devel-0:1.16.2-3.el9_2.tuxcare.els14.i686", "AlmaLinux-9.2:unbound-devel-0:1.16.2-3.el9_2.tuxcare.els14.x86_64", "AlmaLinux-9.2:unbound-libs-0:1.16.2-3.el9_2.tuxcare.els14.i686", "AlmaLinux-9.2:unbound-libs-0:1.16.2-3.el9_2.tuxcare.els14.x86_64" ], "known_affected": [ "AlmaLinux-9.2:python3-unbound-0:1.16.2-3.el9.tuxcare.els1.x86_64", 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"https://cve.tuxcare.com/els/cve/CVE-2024-43167" }, { "category": "external", "summary": "https://access.redhat.com/security/cve/CVE-2024-43167", "url": "https://access.redhat.com/security/cve/CVE-2024-43167" }, { "category": "external", "summary": "https://bugzilla.redhat.com/show_bug.cgi?id=2303456", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2303456" }, { "category": "external", "summary": "https://github.com/NLnetLabs/unbound/issues/1072", "url": "https://github.com/NLnetLabs/unbound/issues/1072" }, { "category": "external", "summary": "https://github.com/NLnetLabs/unbound/pull/1073/files", "url": "https://github.com/NLnetLabs/unbound/pull/1073/files" }, { "category": "external", "summary": "http://www.openwall.com/lists/oss-security/2024/08/16/6", "url": "http://www.openwall.com/lists/oss-security/2024/08/16/6" }, { "category": "external", "summary": "https://lists.debian.org/debian-lts-announce/2024/09/msg00046.html", "url": "https://lists.debian.org/debian-lts-announce/2024/09/msg00046.html" } ], "release_date": "2024-08-12T13:38:00Z", "remediations": [ { "category": "vendor_fix", "date": "2026-08-13T16:14:11.949920Z", "details": "Details on how to apply the fix are available at: https://cve.tuxcare.com/els/releases/CLSA-2026:1786637650", "product_ids": [ "AlmaLinux-9.2:python3-unbound-0:1.16.2-3.el9_2.tuxcare.els14.x86_64", "AlmaLinux-9.2:unbound-0:1.16.2-3.el9_2.tuxcare.els14.x86_64", "AlmaLinux-9.2:unbound-devel-0:1.16.2-3.el9_2.tuxcare.els14.i686", "AlmaLinux-9.2:unbound-devel-0:1.16.2-3.el9_2.tuxcare.els14.x86_64", "AlmaLinux-9.2:unbound-libs-0:1.16.2-3.el9_2.tuxcare.els14.i686", "AlmaLinux-9.2:unbound-libs-0:1.16.2-3.el9_2.tuxcare.els14.x86_64" ], "url": "https://cve.tuxcare.com/els/releases/CLSA-2026:1786637650" }, { "category": "none_available", "date": "2024-08-12T13:38:00Z", "details": "Affected", "product_ids": [ "AlmaLinux-9.2:python3-unbound-0:1.16.2-3.el9.tuxcare.els1.x86_64", 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However, the creation through the control interface omits adding the default-protected zones (e.g., RFC 1918 reverse, AS112 zones, .onion, .localhost). Once the local zone tree exists without the defaults, every query for a default-protected name from a client mapped to that view escapes to the public DNS via the iterator instead of being answered locally, bypassing local policy expectations.", "title": "Vulnerability description" } ], "product_status": { "fixed": [ "AlmaLinux-9.2:python3-unbound-0:1.16.2-3.el9_2.tuxcare.els14.x86_64", "AlmaLinux-9.2:unbound-0:1.16.2-3.el9_2.tuxcare.els14.x86_64", "AlmaLinux-9.2:unbound-devel-0:1.16.2-3.el9_2.tuxcare.els14.i686", "AlmaLinux-9.2:unbound-devel-0:1.16.2-3.el9_2.tuxcare.els14.x86_64", "AlmaLinux-9.2:unbound-libs-0:1.16.2-3.el9_2.tuxcare.els14.i686", "AlmaLinux-9.2:unbound-libs-0:1.16.2-3.el9_2.tuxcare.els14.x86_64" ], "known_affected": [ "AlmaLinux-9.2:python3-unbound-0:1.16.2-3.el9.tuxcare.els1.x86_64", "AlmaLinux-9.2:python3-unbound-0:1.16.2-3.el9.tuxcare.els2.x86_64", "AlmaLinux-9.2:python3-unbound-0:1.16.2-3.el9.tuxcare.els3.x86_64", 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"threats": [ { "category": "impact", "details": "Low" } ] }, { "cve": "CVE-2026-50243", "cwe": { "id": "CWE-348", "name": "Use of Less Trusted Source" }, "notes": [ { "category": "description", "text": "In NLnet Labs Unbound 1.6.2 up to and including 1.25.1, when Unbound is configured with the 'respip' module in front of the validator together with a 'response-ip' redirect rule or an RPZ file with an RPZ-IP trigger, the rewriting handler does not check the security status of the upstream answer and can instead rewrite a BOGUS A/AAAA answer to point to an operator's configured IP. If the validator finds an expired or otherwise invalid RRSIG on an answer whose A record falls within a 'response-ip'/RPZ configuration, the answer is still rewritten and given a hard coded security level of INSECURE. This results in the client receiving an INSECURE NOERROR reply rewritten by the operator's configured IP. A malicious actor can exploit the possible poisonous effect by spoofing a BOGUS A/AAAA answer that falls inside the operator's configured subnet rewrites. Such DNSSEC protected answers are then insecurely redirected to the operator's configured target.", "title": "Vulnerability description" }, { "category": "general", "text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.", "title": "CVSS score applicability" } ], "product_status": { "fixed": [ "AlmaLinux-9.2:python3-unbound-0:1.16.2-3.el9_2.tuxcare.els14.x86_64", "AlmaLinux-9.2:unbound-0:1.16.2-3.el9_2.tuxcare.els14.x86_64", "AlmaLinux-9.2:unbound-devel-0:1.16.2-3.el9_2.tuxcare.els14.i686", "AlmaLinux-9.2:unbound-devel-0:1.16.2-3.el9_2.tuxcare.els14.x86_64", "AlmaLinux-9.2:unbound-libs-0:1.16.2-3.el9_2.tuxcare.els14.i686", "AlmaLinux-9.2:unbound-libs-0:1.16.2-3.el9_2.tuxcare.els14.x86_64" ], "known_affected": [ "AlmaLinux-9.2:python3-unbound-0:1.16.2-3.el9.tuxcare.els1.x86_64", 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"https://cve.tuxcare.com/els/cve/CVE-2026-50243" }, { "category": "external", "summary": "https://www.nlnetlabs.nl/downloads/unbound/CVE-2026-50243.txt", "url": "https://www.nlnetlabs.nl/downloads/unbound/CVE-2026-50243.txt" } ], "release_date": "2026-07-22T14:17:00Z", "remediations": [ { "category": "vendor_fix", "date": "2026-08-13T16:14:11.949920Z", "details": "Details on how to apply the fix are available at: https://cve.tuxcare.com/els/releases/CLSA-2026:1786637650", "product_ids": [ "AlmaLinux-9.2:python3-unbound-0:1.16.2-3.el9_2.tuxcare.els14.x86_64", "AlmaLinux-9.2:unbound-0:1.16.2-3.el9_2.tuxcare.els14.x86_64", "AlmaLinux-9.2:unbound-devel-0:1.16.2-3.el9_2.tuxcare.els14.i686", "AlmaLinux-9.2:unbound-devel-0:1.16.2-3.el9_2.tuxcare.els14.x86_64", "AlmaLinux-9.2:unbound-libs-0:1.16.2-3.el9_2.tuxcare.els14.i686", "AlmaLinux-9.2:unbound-libs-0:1.16.2-3.el9_2.tuxcare.els14.x86_64" ], "url": "https://cve.tuxcare.com/els/releases/CLSA-2026:1786637650" }, { "category": 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RRSIG validation and stored into cache, before later validation treats it as bogus based on NSEC validation. When the resolving thread puts secure on the rrset, and another thread that is on the serve expired path then picks up the updated rrset contents with the secure status for a reply, it can be used to change a specific record, next to a wildcard that could be covered by the wildcard, into the wildcard. A malicious actor can exploit the possible poisonous effect by having any DNSSEC-singed domain (irrelevant to the victim domain) and a CNAME wrapper record that points to a record next to a wildcard (that could be covered by the wildcard). Then quering Unbound for the wildcard sibling record would seed the secure message. A later (after expiry) query for the CNAME wrapper would need to resolve the target sibling record. If the wildcard replay is injected into the response, the wildcard rrset will update the expired sibling record with a secure status before completing proper wildcard validation with NSEC records and eventually treating the CNAME wrapper answer as bogus. The updated poisoned rrset is now secure and points to the wildcard. This vulnerability is explicit for the serve expired path and needs injection of the signed wildcard rrset without the NSEC accompanying rrset.", "title": "Vulnerability description" } ], "product_status": { "fixed": [ "AlmaLinux-9.2:python3-unbound-0:1.16.2-3.el9_2.tuxcare.els14.x86_64", "AlmaLinux-9.2:unbound-0:1.16.2-3.el9_2.tuxcare.els14.x86_64", "AlmaLinux-9.2:unbound-devel-0:1.16.2-3.el9_2.tuxcare.els14.i686", "AlmaLinux-9.2:unbound-devel-0:1.16.2-3.el9_2.tuxcare.els14.x86_64", "AlmaLinux-9.2:unbound-libs-0:1.16.2-3.el9_2.tuxcare.els14.i686", "AlmaLinux-9.2:unbound-libs-0:1.16.2-3.el9_2.tuxcare.els14.x86_64" ], "known_affected": [ "AlmaLinux-9.2:python3-unbound-0:1.16.2-3.el9.tuxcare.els1.x86_64", "AlmaLinux-9.2:python3-unbound-0:1.16.2-3.el9.tuxcare.els2.x86_64", "AlmaLinux-9.2:python3-unbound-0:1.16.2-3.el9.tuxcare.els3.x86_64", "AlmaLinux-9.2:python3-unbound-0:1.16.2-3.el9.tuxcare.els4.x86_64", "AlmaLinux-9.2:python3-unbound-0:1.16.2-3.el9_2.tuxcare.els10.x86_64", 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"https://github.com/TechnitiumSoftware/DnsServer/blob/master/CHANGELOG.md#version-120", "url": "https://github.com/TechnitiumSoftware/DnsServer/blob/master/CHANGELOG.md#version-120" }, { "category": "external", "summary": "https://gitlab.isc.org/isc-projects/bind9/-/issues/4398", "url": "https://gitlab.isc.org/isc-projects/bind9/-/issues/4398" }, { "category": "external", "summary": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/3TBXPRJ2Q235YUZKYDRWOSYNDFBJQWJ3/", "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/3TBXPRJ2Q235YUZKYDRWOSYNDFBJQWJ3/" }, { "category": "external", "summary": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/QITY2QBX2OCBTZIXD2A5ES62STFIA4AL/", "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/QITY2QBX2OCBTZIXD2A5ES62STFIA4AL/" }, { "category": "external", "summary": "https://meterpreter.org/researchers-uncover-dnsbomb-a-new-pdos-attack-exploiting-legitimate-dns-features/", "url": "https://meterpreter.org/researchers-uncover-dnsbomb-a-new-pdos-attack-exploiting-legitimate-dns-features/" }, { "category": "external", "summary": "https://nlnetlabs.nl/downloads/unbound/CVE-2024-33655.txt", "url": "https://nlnetlabs.nl/downloads/unbound/CVE-2024-33655.txt" }, { "category": "external", "summary": "https://nlnetlabs.nl/projects/unbound/security-advisories/", "url": "https://nlnetlabs.nl/projects/unbound/security-advisories/" }, { "category": "external", "summary": "https://sp2024.ieee-security.org/accepted-papers.html", "url": "https://sp2024.ieee-security.org/accepted-papers.html" }, { "category": "external", "summary": "https://www.isc.org/blogs/2024-dnsbomb/", "url": "https://www.isc.org/blogs/2024-dnsbomb/" }, { "category": "external", "summary": "https://lists.debian.org/debian-lts-announce/2025/08/msg00019.html", "url": "https://lists.debian.org/debian-lts-announce/2025/08/msg00019.html" }, { "category": "external", "summary": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/3TBXPRJ2Q235YUZKYDRWOSYNDFBJQWJ3/", "url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/3TBXPRJ2Q235YUZKYDRWOSYNDFBJQWJ3/" }, { "category": "external", "summary": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/QITY2QBX2OCBTZIXD2A5ES62STFIA4AL/", "url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/QITY2QBX2OCBTZIXD2A5ES62STFIA4AL/" } ], "release_date": "2024-06-06T17:15:00Z", "remediations": [ { "category": "vendor_fix", "date": "2026-08-13T16:14:11.949920Z", "details": "Details on how to apply the fix are available at: https://cve.tuxcare.com/els/releases/CLSA-2026:1786637650", "product_ids": [ 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"threats": [ { "category": "impact", "details": "Low" } ] }, { "cve": "CVE-2026-42955", "cwe": { "id": "CWE-672", "name": "Operation on a Resource after Expiration or Release" }, "notes": [ { "category": "description", "text": "In NLnet Labs Unbound 1.16.2 up to and including 1.25.1, a similar vulnerability as with CVE-2026-40622 in the 'ghost domain names' family of attacks was found in Unbound that could extend the ghost domain window by up to one cached TTL configured value for A/AAAA glue records. Similar to other 'ghost domain names' attacks, an adversary needs to control a (ghost) zone and be able to query a vulnerable Unbound. A single client A/AAAA query can cause Unbound to overwrite the cached expired parent-side glue rrset and essentially extend the ghost domain window by up to one cached TTL configured value ('cache-max-ttl'). In configurations where 'harden-referral-path: yes' is used (non-default configuration), no client query is required since Unbound implicitly performs that query. This is a variant of CVE-2026-40622 which only addressed the NS query.", "title": "Vulnerability description" } ], "product_status": { "fixed": [ "AlmaLinux-9.2:python3-unbound-0:1.16.2-3.el9_2.tuxcare.els14.x86_64", "AlmaLinux-9.2:unbound-0:1.16.2-3.el9_2.tuxcare.els14.x86_64", "AlmaLinux-9.2:unbound-devel-0:1.16.2-3.el9_2.tuxcare.els14.i686", "AlmaLinux-9.2:unbound-devel-0:1.16.2-3.el9_2.tuxcare.els14.x86_64", "AlmaLinux-9.2:unbound-libs-0:1.16.2-3.el9_2.tuxcare.els14.i686", "AlmaLinux-9.2:unbound-libs-0:1.16.2-3.el9_2.tuxcare.els14.x86_64" ], "known_affected": [ "AlmaLinux-9.2:python3-unbound-0:1.16.2-3.el9.tuxcare.els1.x86_64", "AlmaLinux-9.2:python3-unbound-0:1.16.2-3.el9.tuxcare.els2.x86_64", "AlmaLinux-9.2:python3-unbound-0:1.16.2-3.el9.tuxcare.els3.x86_64", "AlmaLinux-9.2:python3-unbound-0:1.16.2-3.el9.tuxcare.els4.x86_64", "AlmaLinux-9.2:python3-unbound-0:1.16.2-3.el9_2.tuxcare.els10.x86_64", "AlmaLinux-9.2:python3-unbound-0:1.16.2-3.el9_2.tuxcare.els11.x86_64", 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"2026-08-13T16:14:11.949920Z", "details": "Details on how to apply the fix are available at: https://cve.tuxcare.com/els/releases/CLSA-2026:1786637650", "product_ids": [ "AlmaLinux-9.2:python3-unbound-0:1.16.2-3.el9_2.tuxcare.els14.x86_64", "AlmaLinux-9.2:unbound-0:1.16.2-3.el9_2.tuxcare.els14.x86_64", "AlmaLinux-9.2:unbound-devel-0:1.16.2-3.el9_2.tuxcare.els14.i686", "AlmaLinux-9.2:unbound-devel-0:1.16.2-3.el9_2.tuxcare.els14.x86_64", "AlmaLinux-9.2:unbound-libs-0:1.16.2-3.el9_2.tuxcare.els14.i686", "AlmaLinux-9.2:unbound-libs-0:1.16.2-3.el9_2.tuxcare.els14.x86_64" ], "url": "https://cve.tuxcare.com/els/releases/CLSA-2026:1786637650" }, { "category": "none_available", "date": "2026-07-22T14:17:00Z", "details": "Affected", "product_ids": [ "AlmaLinux-9.2:python3-unbound-0:1.16.2-3.el9.tuxcare.els1.x86_64", "AlmaLinux-9.2:python3-unbound-0:1.16.2-3.el9.tuxcare.els2.x86_64", "AlmaLinux-9.2:python3-unbound-0:1.16.2-3.el9.tuxcare.els3.x86_64", 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