Sam James <sam () gentoo org> wrote: A crafted CMS (S/MIME) EnvelopedData message carrying an oversized wrapped session key can cause a stack buffer overflow in gpg-agent during the PKDECRYPT--kem=CMS handling. This can easily be used for a DoS but, worse, the memory corruption can very likley also be used to mount a remote code execution attack.

A CVE-id has not been assigned. We track this bug as T8044 under https://dev.gnupg.org/T8044. This vulnerability was discovered by: OpenAI Security Research. Their report was received on 2026-01-18; This vulnerability sounds very similar to the just announced OpenSSL vulnerability CVE-2025-15467. That vulnerability was noted as having been discovered Stanislav Fort (Aisle Research).

Is it a coincident that these two issues were detected shortly after one another by different parties?

-Jan

In GnuPG before 2.5.17, a crafted CMS (S/MIME) EnvelopedData message carrying an oversized wrapped session key can cause a stack-based buffer overflow in gpg-agent during PKDECRYPT--kem=CMS handling. This can easily be leveraged for denial of service; however, there is also memory corruption that could lead to remote code execution.