Review reviewCritical

CVE-2026-24881

GnuPG GnuPG, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 6

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: 9.8
EPSS: 1.65%
CISA KEV: Not listed
Published: 2026.01.28

PRIORITY ASSESSMENT

Review review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV

Exploit probability1.65%

Technical severityCVSS 9.8

Vulnerability overview

Affected product and versions

Product: GnuPG GnuPG, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 6
Affected versions: >= 2.5.13 < 2.5.17, >= 5.0.0 < 5.0.1
Fixed versions: 2.5.17, 5.0.1

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide

1
Identify
Confirm that GnuPG GnuPG, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 6 and an affected version are present.
2
Prioritize
Combine exploitation signals with asset exposure and business criticality.
3
Remediate
Follow the vendor advisory or supported update path and preserve rollback options.
4
Verify
Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CWE: CWE-121