# CVE-2026-42784: Sequoia-openpgp: sequoia-openpgp: cryptographic integrity compromise via key flag confusion CVE-2026-42784 is fixed in 8 products on 1 platform, first by DEBIAN-CVE-2026-42784, released May 27, 2026. It is not reported as exploited. Patch Radar priority: High. - Web page: https://patchblox.com/security/cve/CVE-2026-42784 - Priority: High - CVSS: 7.4 (Important) - EPSS: 0.0031 - CISA KEV: not listed - Exploited (vendor report): no - Publicly disclosed: no - Published: Sep 16, 2026 - Weakness: Improper Verification of Cryptographic Signature - Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-42784 ## Description A flaw was found in sequoia-openpgp. The library incorrectly infers key flags for older certificates when a key flags subpacket is missing, leading to a discrepancy in how key capabilities are viewed. This key flag confusion allows an attacker to bypass the back-signature check. Consequently, an attacker can illegitimately bind an arbitrary subkey to their own certificate and forge signatures, completely compromising cryptographic integrity. ## Where it's fixed | Platform | Product | Fixed in | Fix | Released | |---|---|---|---|---| | Linux | rpm-sequoia RHEL 9 | 0:1.10.2.1-1.el9_8 | [RHSA-2026:76733](https://patchblox.com/security/data/fix/linux/rhsa-2026-76733.md) | Oct 6, 2026 | | Linux | rpm-sequoia almalinux 10 | 1.10.2.1-1.el10_2 | [ALSA-2026:76734](https://patchblox.com/security/data/fix/linux/alsa-2026-76734.md) | Oct 6, 2026 | | Linux | rpm-sequoia almalinux 9 | 1.10.2.1-1.el9_8 | [ALSA-2026:76733](https://patchblox.com/security/data/fix/linux/alsa-2026-76733.md) | Oct 6, 2026 | | Linux | rpm-sequoia ol 10 | 0:1.10.2.1-1.el10_2 | [ELSA-2026-76734](https://patchblox.com/security/data/fix/linux/elsa-2026-76734.md) | Oct 6, 2026 | | Linux | rpm-sequoia ol 9 | 0:1.10.2.1-1.el9_8 | [ELSA-2026-76733](https://patchblox.com/security/data/fix/linux/elsa-2026-76733.md) | Oct 7, 2026 | | Linux | rpm-sequoia-devel RHEL 9 | 0:1.10.2.1-1.el9_8 | [RHSA-2026:76733](https://patchblox.com/security/data/fix/linux/rhsa-2026-76733.md) | Oct 6, 2026 | | Linux | rpm-sequoia-devel almalinux 10 | 1.10.2.1-1.el10_2 | [ALSA-2026:76734](https://patchblox.com/security/data/fix/linux/alsa-2026-76734.md) | Oct 6, 2026 | | Linux | rpm-sequoia-devel almalinux 9 | 1.10.2.1-1.el9_8 | [ALSA-2026:76733](https://patchblox.com/security/data/fix/linux/alsa-2026-76733.md) | Oct 6, 2026 | | Linux | rpm-sequoia-devel ol 10 | 0:1.10.2.1-1.el10_2 | [ELSA-2026-76734](https://patchblox.com/security/data/fix/linux/elsa-2026-76734.md) | Oct 6, 2026 | | Linux | rpm-sequoia-devel ol 9 | 0:1.10.2.1-1.el9_8 | [ELSA-2026-76733](https://patchblox.com/security/data/fix/linux/elsa-2026-76733.md) | Oct 7, 2026 | | Linux | rust-rpm-sequoia RHEL 10 | 1.10.2.1-1.el10_2 | [RHSA-2026:76734](https://patchblox.com/security/data/fix/linux/rhsa-2026-76734.md) | Oct 7, 2026 | | Linux | rust-rpm-sequoia rocky 10 | 0:1.10.2.1-1.el10_2 | [RLSA-2026:76734](https://patchblox.com/security/data/fix/linux/rlsa-2026-76734.md) | Oct 7, 2026 | | Linux | rust-rpm-sequoia rocky 9 | 0:1.10.2.1-1.el9_8 | [RLSA-2026:76733](https://patchblox.com/security/data/fix/linux/rlsa-2026-76733.md) | Oct 7, 2026 | | Linux | rust-sequoia-openpgp Debian 14 | 2.2.0-2 | [DEBIAN-CVE-2026-42784](https://patchblox.com/security/data/fix/linux/debian-cve-2026-42784.md) | May 27, 2026 | | Linux | rust-sequoia-sq RHEL 10 | 1.4.0.1-2.el10_2 | [RHSA-2026:76737](https://patchblox.com/security/data/fix/linux/rhsa-2026-76737.md) | Oct 8, 2026 | | Linux | rust-sequoia-sq rocky 10 | 0:1.4.0.1-2.el10_2 | [RLSA-2026:76737](https://patchblox.com/security/data/fix/linux/rlsa-2026-76737.md) | Oct 7, 2026 | | Linux | rust-sequoia-sqv RHEL 10 | 1.3.0.2-1.el10_2 | [RHSA-2026:76735](https://patchblox.com/security/data/fix/linux/rhsa-2026-76735.md) | Oct 7, 2026 | | Linux | rust-sequoia-sqv rocky 10 | 0:1.3.0.2-1.el10_2 | [RLSA-2026:76735](https://patchblox.com/security/data/fix/linux/rlsa-2026-76735.md) | Oct 7, 2026 | | Linux | sequoia-sq almalinux 10 | 1.4.0.1-2.el10_2 | [ALSA-2026:76737](https://patchblox.com/security/data/fix/linux/alsa-2026-76737.md) | Oct 6, 2026 | | Linux | sequoia-sq ol 10 | 0:1.4.0.1-2.0.1.el10_2 | [ELSA-2026-76737](https://patchblox.com/security/data/fix/linux/elsa-2026-76737.md) | Oct 8, 2026 | | Linux | sequoia-sqv almalinux 10 | 1.3.0.2-1.el10_2 | [ALSA-2026:76735](https://patchblox.com/security/data/fix/linux/alsa-2026-76735.md) | Oct 6, 2026 | | Linux | sequoia-sqv ol 10 | 0:1.3.0.2-1.el10_2 | [ELSA-2026-76735](https://patchblox.com/security/data/fix/linux/elsa-2026-76735.md) | Oct 6, 2026 | --- Data as of 2026-11-08T19:12:23Z UTC. 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