CVE-2026-42784 sequoia-openpgp - Authentication Bypass

sequoia-openpgp contains a cryptographic integrity bypass caused by incorrect inference of key flags for older certificates missing key flags subpacket, letting attackers forge signatures and bind arbitrary subkeys, exploit requires crafted certificates.

CVSS base score 7.4 /10
High
CISA KEV
Not listed
Public exploit
None known
EPSS
0.31% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Authentication Bypass
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:N/I:H/A:N
Published
16 September 2026
Updated
15 October 2026
Weakness
CWE-347

Vendor fix

Update to the latest version of sequoia-openpgp.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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