What’s Vulnerable › Vulnerabilities

CVE-2026-24881

• Severity: critical (CVSS 9.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.8% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2026-01-27 · updated 2026-07-15
• Weakness: CWE-121

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.

Affected products

• GnuPG: from 2.5.13 before 2.5.17 — fixed in 2.5.17
• Gpg4Win: from 5.0.0 before 5.0.1 — fixed in 5.0.1

How to fix

Upgrade to a fixed version: GnuPG 2.5.17; Gpg4Win 5.0.1. Check the vendor advisory for mitigations.

References

• https://dev.gnupg.org/T8044
• https://www.openwall.com/lists/oss-security/2026/01/27/8
• https://access.redhat.com/security/cve/CVE-2026-24881
• https://bugzilla.redhat.com/show_bug.cgi?id=2433480
• https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-24881.json

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