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Findings

SUSE-SU-2026:24135-1

Security update for unbound

Published Oct 9, 2026 · corrected/updated Oct 15, 2026 · evidence confidence medium

This update for unbound fixes the following issues: - CVE-2026-77860: 'serve-expired' can bypass Unbound 'wait-limit' (bsc#1280403). - CVE-2026-77955: Possible ZONEMD verification bypass window (bsc#1280404). - CVE-2026-78227: Use-after-free in DoQ stream output buffer on reset re-transmission (bsc#1280405). - CVE-2026-80225: Possible degradation of service from continuous queries on the same TCP/DoT connection (bsc#1280406). - CVE-2026-81634: Possible heap buffer overflow during DNSSEC canonicalization (bsc#1280409). - CVE-2026-81642: Heap buffer overflow and possible Remote Code Execution when digesting DNSKEY (bsc#1280411). - CVE-2026-82717: CNAME synthesis could lead to heap corruption (bsc#1280412). - CVE-2026-82720: Use-after-free in DoH stream cleanup code path (bsc#1280413). - CVE-2026-85501: Retrap: Novel Vulnerabilities to launch Algorithmic Complexity Attacks on DNSSEC (bsc#1280414). Changes for unbound: - Update to 1.26.1: * Update icannbundle.pem certificates in unbound-anchor, valid for 2009-2029 and 2025-2045 * Add max-transfer-size and max-transfer-time options to limit auth-zone and rpz transfer size and time, default disabled * Overload local_data_remove in unbound-control to also remove specific records * Add local-zone types block_aaaa, block_a_wdata and block_aaaa_wdata; fix respip+dns64 to use original A records instead of ones already modified by respip * ipsecmod hook script now needs to start with '#!/bin/sh', it is executed with execv instead of system for security * Server now continues to start if a secondary zone fails to load from its zonefile, or if a primary zonefile is missing; $INCLUDE is no longer allowed in secondary zone zonefiles * Auth-zone and RPZ zones now drop out-of-zone content on load * Primary hostname for zone transfers can now use CNAME(s) * Fix windows 64bit build for libssp dependency * Update IANA portlist * Fix heap out-of-bounds write via size_t-to-int truncation in setup_if()/outside_network_create() for large nu

Grounded briefings

Catalog interpretations for three audiences. Each brief cites ingested metadata and the original advisories below. They are not independent research and they do not invent exploit steps.

Executive

SUSE-SU-2026:24135-1 is a unknown public vulnerability record for this product. It is not currently listed in the CISA Known Exploited catalog. Check the linked vendor or CERT advisories for patch status. This summary is a catalog interpretation of the ingested metadata and cites the original advisories below.

System administrator

Identify whether this product is in your estate, then compare installed versions with the affected ranges. Affected packages or ranges on record: unbound (0 → 1.26.1-159998.1.1). Check the linked vendor or CERT advisories for patch status. Prefer the vendor or distribution advisory linked in Sources before changing production systems. This is a catalog interpretation, not a runbook.

Security analyst

Signals on file: no CVSS/EPSS yet. It is not currently listed in the CISA Known Exploited catalog. Sources contributing to this record: osv. Public exploit references, when present, are outbound links only and are not proof of active exploitation. This is a catalog interpretation of stored metadata.

Exploitation and remediation

  • Exploitation evidence

    Not listed as known exploited in CISA KEV. Not in CISA KEV or VulnCheck KEV.

  • Patch and remediation

    No required-action text is stored yet. Use the vendor or CERT links in Sources for patch availability.

  • Safe detection guidance

    Compare installed versions with the affected ranges below and verify the advisory from the original publisher. This site stores metadata and outbound links only; it does not ship exploit code or proof-of-concept payloads.

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. Oct 9, 2026 · OpenSSF OSV / OSV Scanner

    Detected

    This update for unbound fixes the following issues: - CVE-2026-77860: 'serve-expired' can bypass Unbound 'wait-limit' (bsc#1280403). - CVE-2026-77955: Possible ZONEMD verification bypass window (bsc#1280404). - CVE-2026-78227: Use-after-free in DoQ stream output buffer on reset re-transmission (bsc#1280405). - CVE-2026-80225: Possible degradation of service from continuous queries on the same TCP/

  2. Oct 15, 2026 · OpenSSF OSV / OSV Scanner

    Fix available

    unbound fixed in 1.26.1-159998.1.1

  3. Oct 15, 2026 · OpenSSF OSV / OSV Scanner

    Fix available

    unbound fixed in 1.26.1-159998.1.1

  4. Oct 15, 2026 · OpenSSF OSV / OSV Scanner

    Updated

    This update for unbound fixes the following issues: - CVE-2026-77860: 'serve-expired' can bypass Unbound 'wait-limit' (bsc#1280403). - CVE-2026-77955: Possible ZONEMD verification bypass window (bsc#1280404). - CVE-2026-78227: Use-after-free in DoQ stream output buffer on reset re-transmission (bsc#1280405). - CVE-2026-80225: Possible degradation of service from continuous queries on the same TCP/

Affected

  • SUSE:Linux Micro 6.0 unbound0 → 1.26.1-159998.1.1

Sources

References