Vulnerability Description
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.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Gnupg | Gnupg | >= 2.5.13, < 2.5.17 |
| Gpg4Win | Gpg4Win | >= 5.0.0, < 5.0.1 |
Related Weaknesses (CWE)
References
- https://dev.gnupg.org/T8044ExploitProduct
- https://www.openwall.com/lists/oss-security/2026/01/27/8Mailing ListThird Party Advisory
FAQ
What is CVE-2026-24881?
CVE-2026-24881 is a vulnerability with a CVSS score of 8.1 (HIGH). 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. ...
How severe is CVE-2026-24881?
CVE-2026-24881 has been rated HIGH with a CVSS base score of 8.1/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-24881?
Check the references section above for vendor advisories and patch information. Affected products include: Gnupg Gnupg, Gpg4Win Gpg4Win.