CVE-2026-24881

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 v3 8.1 HIGH

8.1^/10

CVSS v3 : HIGH

Vector :

Exploitability : 2.2 / Impact : 5.9

Attack Vector NETWORK

Attack Complexity HIGH

Privileges Required NONE

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact HIGH

Scope UNCHANGED

References

Link	Resource
https://dev.gnupg.org/T8044	Exploit Product
https://www.openwall.com/lists/oss-security/2026/01/27/8	Mailing List Third Party Advisory

Configurations

Configuration 1 (hide)

OR	cpe:2.3:a:gnupg:gnupg:::::-:::*
	cpe:2.3:a:gpg4win:gpg4win::::::::

History

17 Jun 2026, 10:23

Type	Values Removed	Values Added
Summary		(es) En GnuPG anterior a 2.5.17, un mensaje CMS (S/MIME) EnvelopedData manipulado que transporta una clave de sesión envuelta de tamaño excesivo puede causar un desbordamiento de búfer basado en pila en gpg-agent durante el manejo de PKDECRYPT--kem=CMS. Esto puede ser fácilmente aprovechado para una denegación de servicio; sin embargo, también hay corrupción de memoria que podría conducir a la ejecución remota de código.

12 Feb 2026, 18:15

Type	Values Removed	Values Added
CPE		cpe:2.3:a:gnupg:gnupg:::::-:::* cpe:2.3:a:gpg4win:gpg4win::::::::
First Time		Gnupg gnupg Gpg4win Gnupg Gpg4win gpg4win
References	~~() https://dev.gnupg.org/T8044 -~~	() https://dev.gnupg.org/T8044 - Exploit, Product
References	~~() https://www.openwall.com/lists/oss-security/2026/01/27/8 -~~	() https://www.openwall.com/lists/oss-security/2026/01/27/8 - Mailing List, Third Party Advisory

27 Jan 2026, 19:16

Type	Values Removed	Values Added
New CVE

Information

Published : 2026-01-27 19:16

Updated : 2026-06-17 10:23

NVD link : CVE-2026-24881

Mitre link : CVE-2026-24881

CVE.ORG link : CVE-2026-24881

JSON object : View

Products Affected

gpg4win

gpg4win

gnupg

gnupg

CWE

CWE-121

Stack-based Buffer Overflow

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