CVE catalog

CVE-2026-42784

rust-sequoia-openpgp: CVE-2026-42784

[CVE catalog]

Severity
High · CVSS 7.4CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:N/I:H/A:N
Published
Source
[NVD] · [CVE record]
EPSS
0.31% · Oct 25, 2026

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.

Vulnerable and fixed packages

Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.

DistributionPackageReleaseVersionStatus
Debianrust-sequoia-openpgpsid2.4.1-2fixed
Debianrust-sequoia-openpgpforky2.4.1-2fixed
Debianrust-sequoia-openpgptrixie2.0.0-2+deb13u1vulnerable
Debianrust-sequoia-openpgpbookworm1.12.0-2vulnerable

Fixed-version evidence

DistributionPackageTypeReleaseFixed versionUrgencyOriginBugs
Debianrust-sequoia-openpgpsourcesid2.2.0-2not yet assignedNot reported[1137328]
Debianrust-sequoia-openpgpsourceforky2.2.0-2not yet assignedNot reported[1137328]
Debianrust-sequoia-openpgpsourcetrixie(unfixed)not yet assignedNot reported[1137328]
Debianrust-sequoia-openpgpsourcebookworm(unfixed)not yet assignedNot reported[1137328]

[Debian bug #1137328]

Notes

[trixie] rust-sequoia-openpgp: Minor issue [bookworm] rust-sequoia-openpgp: Minor issue

OpenFactory catalog packages

[Debian 12 (Bookworm)]

Observed:

References

[CERT-Bund public advisories] · [Debian Security Tracker] · [FIRST EPSS] · [National Vulnerability Database (NVD)] · [Red Hat security advisories and VEX] · [SUSE security advisories and VEX]