CVE-2026-42784 — Sequoia-openpgp: sequoia-openpgp: cryptographic integrity compromise via key flag confusion
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 c…
Published: 2026-09-16 · CVSS: 7.4 · CVSS 3.1
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.
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7