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.
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
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| rpm-sequoia · RHEL 9 | 0:1.10.2.1-1.el9_8 | RHSA-2026:76733 | Oct 6, 2026 |
| rpm-sequoia · almalinux 10 | 1.10.2.1-1.el10_2 | ALSA-2026:76734 | Oct 6, 2026 |
| rpm-sequoia · almalinux 9 | 1.10.2.1-1.el9_8 | ALSA-2026:76733 | Oct 6, 2026 |
| rpm-sequoia · ol 10 | 0:1.10.2.1-1.el10_2 | ELSA-2026-76734 | Oct 6, 2026 |
| rpm-sequoia · ol 9 | 0:1.10.2.1-1.el9_8 | ELSA-2026-76733 | Oct 7, 2026 |
| rpm-sequoia-devel · RHEL 9 | 0:1.10.2.1-1.el9_8 | RHSA-2026:76733 | Oct 6, 2026 |
| rpm-sequoia-devel · almalinux 10 | 1.10.2.1-1.el10_2 | ALSA-2026:76734 | Oct 6, 2026 |
| rpm-sequoia-devel · almalinux 9 | 1.10.2.1-1.el9_8 | ALSA-2026:76733 | Oct 6, 2026 |
| rpm-sequoia-devel · ol 10 | 0:1.10.2.1-1.el10_2 | ELSA-2026-76734 | Oct 6, 2026 |
| rpm-sequoia-devel · ol 9 | 0:1.10.2.1-1.el9_8 | ELSA-2026-76733 | Oct 7, 2026 |
| rust-rpm-sequoia · RHEL 10 | 1.10.2.1-1.el10_2 | RHSA-2026:76734 | Oct 7, 2026 |
| rust-rpm-sequoia · rocky 10 | 0:1.10.2.1-1.el10_2 | RLSA-2026:76734 | Oct 7, 2026 |
| rust-rpm-sequoia · rocky 9 | 0:1.10.2.1-1.el9_8 | RLSA-2026:76733 | Oct 7, 2026 |
| rust-sequoia-openpgp · Debian 14 | 2.2.0-2 | DEBIAN-CVE-2026-42784 | May 27, 2026 |
| rust-sequoia-sq · RHEL 10 | 1.4.0.1-2.el10_2 | RHSA-2026:76737 | Oct 8, 2026 |
| rust-sequoia-sq · rocky 10 | 0:1.4.0.1-2.el10_2 | RLSA-2026:76737 | Oct 7, 2026 |
| rust-sequoia-sqv · RHEL 10 | 1.3.0.2-1.el10_2 | RHSA-2026:76735 | Oct 7, 2026 |
| rust-sequoia-sqv · rocky 10 | 0:1.3.0.2-1.el10_2 | RLSA-2026:76735 | Oct 7, 2026 |
| sequoia-sq · almalinux 10 | 1.4.0.1-2.el10_2 | ALSA-2026:76737 | Oct 6, 2026 |
| sequoia-sq · ol 10 | 0:1.4.0.1-2.0.1.el10_2 | ELSA-2026-76737 | Oct 8, 2026 |
| sequoia-sqv · almalinux 10 | 1.3.0.2-1.el10_2 | ALSA-2026:76735 | Oct 6, 2026 |
| sequoia-sqv · ol 10 | 0:1.3.0.2-1.el10_2 | ELSA-2026-76735 | Oct 6, 2026 |
Patch Radar data is free to use with attribution. Terms and how to credit it.
Product names, logos and trademarks shown on Patch Radar belong to their respective owners. They are used only to identify the software each security fix applies to and to help readers find their platform. Their use does not imply any affiliation with, or endorsement by, those owners, and Patchblox is not affiliated with any of them.