CVE-2026-24881

Gpg4win: Stack-based Buffer Overflow

CVE-2026-24881 is fixed in Gpg4win on 1 platform by Gpg4win 5.0.1 (version 5.0.1), released January 27, 2026. It is not reported as exploited. Patch Radar priority: Urgent.

Urgent

CVSS

9.8

No vendor severity

Exploitation

None reported

No vendor assessment

CISA KEV

Not listed

Not in the Known Exploited Vulnerabilities catalog

EPSS

0.0181

78th percentile

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.

Where it's fixed

Product	Fixed in	Fix	Released
Windows apps
Gpg4win	5.0.1	Gpg4win 5.0.1	Jan 27, 2026

Details

Published
January 27, 2026
Weakness
CWE-121: Stack-based Buffer Overflow
Vendor advisory
https://nvd.nist.gov/vuln/detail/CVE-2026-24881

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