CVE-2026-42784
HighCVSS 7.4Exploitation Probability (EPSS)
Low risk24th percentile - higher than 24% of all known CVEs
Summary
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, illegitimately bind an arbitrary subkey to their own certificate, and forge signatures, completely compromising cryptographic integrity.
Risk Assessment
An attacker can bypass signature verification and forge signatures, completely undermining trust in cryptography relying on sequoia-openpgp.
Recommendation
Update the sequoia-openpgp library to a version containing the fix.
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Original NVD description (English source)
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.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS

