# CVE-2026-31789: Heap Buffer Overflow in Hexadecimal Conversion CVE-2026-31789 is fixed in 7 products on 1 platform, first by libssl3t64 3.5.5-1ubuntu3, released April 6, 2026. It is not reported as exploited. Patch Radar priority: High. - Web page: https://patchblox.com/security/cve/CVE-2026-31789 - Priority: High - CVSS: 9.8 (Moderate) - EPSS: 0.0025 - CISA KEV: not listed - Exploited (vendor report): no - Publicly disclosed: no - Published: Apr 6, 2026 - Weakness: Out-of-bounds Write - Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-31789 ## Description This update for openssl-1_0_0 fixes the following issues: - CVE-2026-28387: Potential use-after-free in DANE client code (bsc#1260441). - CVE-2026-28388: NULL Pointer Dereference When Processing a Delta CRL (bsc#1260442). - CVE-2026-28389: Possible NULL dereference when processing CMS KeyAgreeRecipientInfo (bsc#1260443). - CVE-2026-31789: Heap buffer overflow in hexadecimal conversion (bsc#1260444). - CVE-2026-31790: Incorrect failure handling in RSA KEM RSASVE encapsulation (bsc#1260445). ## Where it's fixed | Platform | Product | Fixed in | Fix | Released | |---|---|---|---|---| | Linux | libssl3 Ubuntu 22.04.1 LTS (jammy) | 3.0.2-0ubuntu1.23 | [libssl3 3.0.2-0ubuntu1.23](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-libssl3-3.0.2-0ubuntu1.23.md) | Apr 15, 2026 | | Linux | libssl3t64 Ubuntu 24.04.5 LTS (noble) | 3.0.13-0ubuntu3.9 | [libssl3t64 3.0.13-0ubuntu3.9](https://patchblox.com/security/data/fix/linux/ubuntu-noble-libssl3t64-3.0.13-0ubuntu3.9.md) | Apr 15, 2026 | | Linux | libssl3t64 Ubuntu 25.10 (questing) | 3.5.3-1ubuntu3.3 | [libssl3t64 3.5.3-1ubuntu3.3](https://patchblox.com/security/data/fix/linux/ubuntu-questing-libssl3t64-3.5.3-1ubuntu3.3.md) | Apr 15, 2026 | | Linux | libssl3t64 Ubuntu 26.04.1 LTS (resolute) | 3.5.5-1ubuntu3 | [libssl3t64 3.5.5-1ubuntu3](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-libssl3t64-3.5.5-1ubuntu3.md) | Apr 6, 2026 | | Linux | openssl Debian 12.15 (bookworm) | 3.0.19-1~deb12u2 | [DEBIAN-CVE-2026-31789](https://patchblox.com/security/data/fix/linux/debian-cve-2026-31789.md) | Apr 7, 2026 | | Linux | openssl Debian 13.5 (trixie) | 3.5.5-1~deb13u2 | [DEBIAN-CVE-2026-31789](https://patchblox.com/security/data/fix/linux/debian-cve-2026-31789.md) | Apr 7, 2026 | | Linux | openssl Debian 14 | 3.6.2-1 | [DEBIAN-CVE-2026-31789](https://patchblox.com/security/data/fix/linux/debian-cve-2026-31789.md) | Apr 7, 2026 | | Linux | openssl Ubuntu 22.04.1 LTS (jammy) | 3.0.2-0ubuntu1.23 | [openssl 3.0.2-0ubuntu1.23](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-openssl-3.0.2-0ubuntu1.23.md) | Apr 15, 2026 | | Linux | openssl Ubuntu 24.04.5 LTS (noble) | 3.0.13-0ubuntu3.9 | [openssl 3.0.13-0ubuntu3.9](https://patchblox.com/security/data/fix/linux/ubuntu-noble-openssl-3.0.13-0ubuntu3.9.md) | Apr 15, 2026 | | Linux | openssl Ubuntu 25.10 (questing) | 3.5.3-1ubuntu3.3 | [openssl 3.5.3-1ubuntu3.3](https://patchblox.com/security/data/fix/linux/ubuntu-questing-openssl-3.5.3-1ubuntu3.3.md) | Apr 15, 2026 | | Linux | openssl Ubuntu 26.04.1 LTS (resolute) | 3.5.5-1ubuntu3 | [openssl 3.5.5-1ubuntu3](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-openssl-3.5.5-1ubuntu3.md) | Apr 6, 2026 | | Linux | openssl-1_0_0 opensuse-leap 15.6 | 1.0.2p-150000.3.105.1 | [SUSE-SU-2026:1291-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-1291-1.md) | Apr 13, 2026 | | Linux | openssl-1_0_0 sles 15.6 | 1.0.2p-150000.3.105.1 | [SUSE-SU-2026:1291-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-1291-1.md) | Apr 13, 2026 | | Linux | openssl-1_0_0 sles 15.7 | 1.0.2p-150000.3.105.1 | [SUSE-SU-2026:1291-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-1291-1.md) | Apr 13, 2026 | | Linux | openssl-1_1 sles 15.6 | 1.1.1w-150600.5.26.2 | [SUSE-SU-2026:1577-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-1577-1.md) | Apr 23, 2026 | | Linux | openssl-1_1 sles 15.7 | 1.1.1w-150700.11.16.1 | [SUSE-SU-2026:1386-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-1386-1.md) | Apr 16, 2026 | | Linux | openssl-3 opensuse-leap 15.6 | 3.1.4-150600.5.45.1 | [SUSE-SU-2026:1215-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-1215-1.md) | Apr 8, 2026 | | Linux | openssl-3 opensuse-leap 16.0 | 3.5.0-160000.7.1 | [OPENSUSE-SU-2026:20525-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-20525-1.md) | Apr 13, 2026 | | Linux | openssl-3 sles 15.6 | 3.1.4-150600.5.45.1 | [SUSE-SU-2026:1215-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-1215-1.md) | Apr 8, 2026 | | Linux | openssl-3 sles 15.7 | 3.2.3-150700.5.31.1 | [SUSE-SU-2026:1375-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-1375-1.md) | Apr 15, 2026 | | Linux | openssl-3 sles 16.0 | 3.5.0-160000.7.1 | [SUSE-SU-2026:21186-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-21186-1.md) | Apr 13, 2026 | | Linux | openssl-provider-legacy Ubuntu 25.10 (questing) | 3.5.3-1ubuntu3.3 | [openssl-provider-legacy 3.5.3-1ubuntu3.3](https://patchblox.com/security/data/fix/linux/ubuntu-questing-openssl-provider-legacy-3.5.3-1ubuntu3.3.md) | Apr 15, 2026 | | Linux | openssl-provider-legacy Ubuntu 26.04.1 LTS (resolute) | 3.5.5-1ubuntu3 | [openssl-provider-legacy 3.5.5-1ubuntu3](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-openssl-provider-legacy-3.5.5-1ubuntu3.md) | Apr 6, 2026 | --- Data as of 2026-11-08T13:06:02Z UTC. 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