# CVE-2026-42960: Possible cache poisoning via promiscuous records for the authority section CVE-2026-42960 is fixed in 17 products on 1 platform, first by libunbound2 1.6.7-1ubuntu2.6+esm4, released May 19, 2026. It is not reported as exploited. Patch Radar priority: High. - Web page: https://patchblox.com/security/cve/CVE-2026-42960 - Priority: High - CVSS: 10.0 (Moderate) - EPSS: 0.0026 - CISA KEV: not listed - Exploited (vendor report): no - Publicly disclosed: no - Published: May 19, 2026 - Weakness: Acceptance of Extraneous Untrusted Data With Trusted Data - Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-42960 ## Description Possible cache poisoning attack while following delegation (bsc#1265588). ## Where it's fixed | Platform | Product | Fixed in | Fix | Released | |---|---|---|---|---| | Linux | libunbound2 Ubuntu 18.04.6 LTS (bionic) | 1.6.7-1ubuntu2.6+esm4 | [libunbound2 1.6.7-1ubuntu2.6+esm4](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-libunbound2-1.6.7-1ubuntu2.6-esm4.md) | May 19, 2026 | | Linux | libunbound8 Ubuntu 20.04 LTS (focal) | 1.9.4-2ubuntu1.11+esm1 | [libunbound8 1.9.4-2ubuntu1.11+esm1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-libunbound8-1.9.4-2ubuntu1.11-esm1.md) | May 19, 2026 | | Linux | libunbound8 Ubuntu 22.04.1 LTS (jammy) | 1.13.1-1ubuntu5.15 | [libunbound8 1.13.1-1ubuntu5.15](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-libunbound8-1.13.1-1ubuntu5.15.md) | May 27, 2026 | | Linux | libunbound8 Ubuntu 24.04.5 LTS (noble) | 1.19.2-1ubuntu3.8 | [libunbound8 1.19.2-1ubuntu3.8](https://patchblox.com/security/data/fix/linux/ubuntu-noble-libunbound8-1.19.2-1ubuntu3.8.md) | May 27, 2026 | | Linux | libunbound8 Ubuntu 25.10 (questing) | 1.22.0-2ubuntu2.3 | [libunbound8 1.22.0-2ubuntu2.3](https://patchblox.com/security/data/fix/linux/ubuntu-questing-libunbound8-1.22.0-2ubuntu2.3.md) | May 27, 2026 | | Linux | libunbound8 Ubuntu 26.04.1 LTS (resolute) | 1.24.2-1ubuntu2.1 | [libunbound8 1.24.2-1ubuntu2.1](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-libunbound8-1.24.2-1ubuntu2.1.md) | May 19, 2026 | | Linux | python-unbound Ubuntu 18.04.6 LTS (bionic) | 1.6.7-1ubuntu2.6+esm4 | [python-unbound 1.6.7-1ubuntu2.6+esm4](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-python-unbound-1.6.7-1ubuntu2.6-esm4.md) | May 19, 2026 | | Linux | python-unbound Ubuntu 20.04 LTS (focal) | 1.9.4-2ubuntu1.11+esm1 | [python-unbound 1.9.4-2ubuntu1.11+esm1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-python-unbound-1.9.4-2ubuntu1.11-esm1.md) | May 19, 2026 | | Linux | python3-unbound RHEL 9 | 0:1.26.1-1.el9_9 | [RHSA-2026:97497](https://patchblox.com/security/data/fix/linux/rhsa-2026-97497.md) | Nov 11, 2026 | | Linux | python3-unbound Ubuntu 18.04.6 LTS (bionic) | 1.6.7-1ubuntu2.6+esm4 | [python3-unbound 1.6.7-1ubuntu2.6+esm4](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-python3-unbound-1.6.7-1ubuntu2.6-esm4.md) | May 19, 2026 | | Linux | python3-unbound Ubuntu 20.04 LTS (focal) | 1.9.4-2ubuntu1.11+esm1 | [python3-unbound 1.9.4-2ubuntu1.11+esm1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-python3-unbound-1.9.4-2ubuntu1.11-esm1.md) | May 19, 2026 | | Linux | python3-unbound Ubuntu 22.04.1 LTS (jammy) | 1.13.1-1ubuntu5.15 | [python3-unbound 1.13.1-1ubuntu5.15](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-python3-unbound-1.13.1-1ubuntu5.15.md) | May 27, 2026 | | Linux | python3-unbound Ubuntu 24.04.5 LTS (noble) | 1.19.2-1ubuntu3.8 | [python3-unbound 1.19.2-1ubuntu3.8](https://patchblox.com/security/data/fix/linux/ubuntu-noble-python3-unbound-1.19.2-1ubuntu3.8.md) | May 27, 2026 | | Linux | python3-unbound Ubuntu 25.10 (questing) | 1.22.0-2ubuntu2.3 | [python3-unbound 1.22.0-2ubuntu2.3](https://patchblox.com/security/data/fix/linux/ubuntu-questing-python3-unbound-1.22.0-2ubuntu2.3.md) | May 27, 2026 | | Linux | python3-unbound Ubuntu 26.04.1 LTS (resolute) | 1.24.2-1ubuntu2.1 | [python3-unbound 1.24.2-1ubuntu2.1](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-python3-unbound-1.24.2-1ubuntu2.1.md) | May 19, 2026 | | Linux | python3-unbound amzn 2023 | 1.17.1-1.amzn2023.0.12 | [ALAS2023-2026-1756](https://patchblox.com/security/data/fix/linux/alas2023-2026-1756.md) | May 25, 2026 | | Linux | python3-unbound-debuginfo amzn 2023 | 1.17.1-1.amzn2023.0.12 | [ALAS2023-2026-1756](https://patchblox.com/security/data/fix/linux/alas2023-2026-1756.md) | May 25, 2026 | | Linux | unbound Debian 13.5 (trixie) | 1.22.0-2+deb13u3 | [DEBIAN-CVE-2026-42960](https://patchblox.com/security/data/fix/linux/debian-cve-2026-42960.md) | May 27, 2026 | | Linux | unbound Debian 14 | 1.25.1-1 | [DEBIAN-CVE-2026-42960](https://patchblox.com/security/data/fix/linux/debian-cve-2026-42960.md) | May 27, 2026 | | Linux | unbound RHEL 10 | 1.26.1-2.el10_3 | [RHSA-2026:97121](https://patchblox.com/security/data/fix/linux/rhsa-2026-97121.md) | May 20, 2026 | | Linux | unbound RHEL 9 | 0:1.26.1-1.el9_9 | [RHSA-2026:97497](https://patchblox.com/security/data/fix/linux/rhsa-2026-97497.md) | Nov 11, 2026 | | Linux | unbound Ubuntu 18.04.6 LTS (bionic) | 1.6.7-1ubuntu2.6+esm4 | [unbound 1.6.7-1ubuntu2.6+esm4](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-unbound-1.6.7-1ubuntu2.6-esm4.md) | May 19, 2026 | | Linux | unbound Ubuntu 20.04 LTS (focal) | 1.9.4-2ubuntu1.11+esm1 | [unbound 1.9.4-2ubuntu1.11+esm1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-unbound-1.9.4-2ubuntu1.11-esm1.md) | May 19, 2026 | | Linux | unbound Ubuntu 22.04.1 LTS (jammy) | 1.13.1-1ubuntu5.15 | [unbound 1.13.1-1ubuntu5.15](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-unbound-1.13.1-1ubuntu5.15.md) | May 27, 2026 | | Linux | unbound Ubuntu 24.04.5 LTS (noble) | 1.19.2-1ubuntu3.8 | [unbound 1.19.2-1ubuntu3.8](https://patchblox.com/security/data/fix/linux/ubuntu-noble-unbound-1.19.2-1ubuntu3.8.md) | May 27, 2026 | | Linux | unbound Ubuntu 25.10 (questing) | 1.22.0-2ubuntu2.3 | [unbound 1.22.0-2ubuntu2.3](https://patchblox.com/security/data/fix/linux/ubuntu-questing-unbound-1.22.0-2ubuntu2.3.md) | May 27, 2026 | | Linux | unbound Ubuntu 26.04.1 LTS (resolute) | 1.24.2-1ubuntu2.1 | [unbound 1.24.2-1ubuntu2.1](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-unbound-1.24.2-1ubuntu2.1.md) | May 19, 2026 | | Linux | unbound amzn 2023 | 1.17.1-1.amzn2023.0.12 | [ALAS2023-2026-1756](https://patchblox.com/security/data/fix/linux/alas2023-2026-1756.md) | May 25, 2026 | | Linux | unbound opensuse-leap 16.0 | 1.24.1-160000.2.1 | [OPENSUSE-SU-2026:21083-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-21083-1.md) | Jun 18, 2026 | | Linux | unbound sles 16.0 | 1.24.1-160000.2.1 | [SUSE-SU-2026:22160-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-22160-1.md) | Jun 18, 2026 | | Linux | unbound-anchor Ubuntu 18.04.6 LTS (bionic) | 1.6.7-1ubuntu2.6+esm4 | [unbound-anchor 1.6.7-1ubuntu2.6+esm4](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-unbound-anchor-1.6.7-1ubuntu2.6-esm4.md) | May 19, 2026 | | Linux | unbound-anchor Ubuntu 20.04 LTS (focal) | 1.9.4-2ubuntu1.11+esm1 | [unbound-anchor 1.9.4-2ubuntu1.11+esm1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-unbound-anchor-1.9.4-2ubuntu1.11-esm1.md) | May 19, 2026 | | Linux | unbound-anchor Ubuntu 22.04.1 LTS (jammy) | 1.13.1-1ubuntu5.15 | [unbound-anchor 1.13.1-1ubuntu5.15](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-unbound-anchor-1.13.1-1ubuntu5.15.md) | May 27, 2026 | | Linux | unbound-anchor Ubuntu 24.04.5 LTS (noble) | 1.19.2-1ubuntu3.8 | [unbound-anchor 1.19.2-1ubuntu3.8](https://patchblox.com/security/data/fix/linux/ubuntu-noble-unbound-anchor-1.19.2-1ubuntu3.8.md) | May 27, 2026 | | Linux | unbound-anchor Ubuntu 25.10 (questing) | 1.22.0-2ubuntu2.3 | [unbound-anchor 1.22.0-2ubuntu2.3](https://patchblox.com/security/data/fix/linux/ubuntu-questing-unbound-anchor-1.22.0-2ubuntu2.3.md) | May 27, 2026 | | Linux | unbound-anchor Ubuntu 26.04.1 LTS (resolute) | 1.24.2-1ubuntu2.1 | [unbound-anchor 1.24.2-1ubuntu2.1](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-unbound-anchor-1.24.2-1ubuntu2.1.md) | May 19, 2026 | | Linux | unbound-anchor amzn 2023 | 1.17.1-1.amzn2023.0.12 | [ALAS2023-2026-1756](https://patchblox.com/security/data/fix/linux/alas2023-2026-1756.md) | May 25, 2026 | | Linux | unbound-anchor-debuginfo amzn 2023 | 1.17.1-1.amzn2023.0.12 | [ALAS2023-2026-1756](https://patchblox.com/security/data/fix/linux/alas2023-2026-1756.md) | May 25, 2026 | | Linux | unbound-debuginfo amzn 2023 | 1.17.1-1.amzn2023.0.12 | [ALAS2023-2026-1756](https://patchblox.com/security/data/fix/linux/alas2023-2026-1756.md) | May 25, 2026 | | Linux | unbound-debugsource amzn 2023 | 1.17.1-1.amzn2023.0.12 | [ALAS2023-2026-1756](https://patchblox.com/security/data/fix/linux/alas2023-2026-1756.md) | May 25, 2026 | | Linux | unbound-devel RHEL 9 | 0:1.26.1-1.el9_9 | [RHSA-2026:97497](https://patchblox.com/security/data/fix/linux/rhsa-2026-97497.md) | Nov 11, 2026 | | Linux | unbound-devel amzn 2023 | 1.17.1-1.amzn2023.0.12 | [ALAS2023-2026-1756](https://patchblox.com/security/data/fix/linux/alas2023-2026-1756.md) | May 25, 2026 | | Linux | unbound-dracut RHEL 9 | 0:1.26.1-1.el9_9 | [RHSA-2026:97497](https://patchblox.com/security/data/fix/linux/rhsa-2026-97497.md) | Nov 11, 2026 | | Linux | unbound-host Ubuntu 18.04.6 LTS (bionic) | 1.6.7-1ubuntu2.6+esm4 | [unbound-host 1.6.7-1ubuntu2.6+esm4](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-unbound-host-1.6.7-1ubuntu2.6-esm4.md) | May 19, 2026 | | Linux | unbound-host Ubuntu 20.04 LTS (focal) | 1.9.4-2ubuntu1.11+esm1 | [unbound-host 1.9.4-2ubuntu1.11+esm1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-unbound-host-1.9.4-2ubuntu1.11-esm1.md) | May 19, 2026 | | Linux | unbound-host Ubuntu 22.04.1 LTS (jammy) | 1.13.1-1ubuntu5.15 | [unbound-host 1.13.1-1ubuntu5.15](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-unbound-host-1.13.1-1ubuntu5.15.md) | May 27, 2026 | | Linux | unbound-host Ubuntu 24.04.5 LTS (noble) | 1.19.2-1ubuntu3.8 | [unbound-host 1.19.2-1ubuntu3.8](https://patchblox.com/security/data/fix/linux/ubuntu-noble-unbound-host-1.19.2-1ubuntu3.8.md) | May 27, 2026 | | Linux | unbound-host Ubuntu 25.10 (questing) | 1.22.0-2ubuntu2.3 | [unbound-host 1.22.0-2ubuntu2.3](https://patchblox.com/security/data/fix/linux/ubuntu-questing-unbound-host-1.22.0-2ubuntu2.3.md) | May 27, 2026 | | Linux | unbound-host Ubuntu 26.04.1 LTS (resolute) | 1.24.2-1ubuntu2.1 | [unbound-host 1.24.2-1ubuntu2.1](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-unbound-host-1.24.2-1ubuntu2.1.md) | May 19, 2026 | | Linux | unbound-libs RHEL 9 | 0:1.26.1-1.el9_9 | [RHSA-2026:97497](https://patchblox.com/security/data/fix/linux/rhsa-2026-97497.md) | Nov 11, 2026 | | Linux | unbound-libs amzn 2023 | 1.17.1-1.amzn2023.0.12 | [ALAS2023-2026-1756](https://patchblox.com/security/data/fix/linux/alas2023-2026-1756.md) | May 25, 2026 | | Linux | unbound-libs-debuginfo amzn 2023 | 1.17.1-1.amzn2023.0.12 | [ALAS2023-2026-1756](https://patchblox.com/security/data/fix/linux/alas2023-2026-1756.md) | May 25, 2026 | | Linux | unbound-utils amzn 2023 | 1.17.1-1.amzn2023.0.12 | [ALAS2023-2026-1756](https://patchblox.com/security/data/fix/linux/alas2023-2026-1756.md) | May 25, 2026 | | Linux | unbound-utils-debuginfo amzn 2023 | 1.17.1-1.amzn2023.0.12 | [ALAS2023-2026-1756](https://patchblox.com/security/data/fix/linux/alas2023-2026-1756.md) | May 25, 2026 | --- Data as of 2026-11-11T07:45:43Z UTC. 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