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Gnupg CVE-2026-24881

HIGH
Stack-based Buffer Overflow (CWE-121)
2026-01-27 cve@mitre.org
RCE Buffer Overflow Stack Overflow Memory Corruption Denial Of Service Gnupg Gpg4win Red Hat Suse
8.1
CVSS 3.1 · NVD
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Severity by source

NVD PRIMARY
8.1 HIGH
AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
SUSE
HIGH
qualitative
Red Hat
8.1 HIGH
qualitative

Primary rating from NVD.

CVSS VectorNVD

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

Lifecycle Timeline

4
Patch released
Apr 09, 2026 - 20:30 nvd
Patch available
Analysis Generated
Mar 12, 2026 - 21:55 vuln.today
PoC Detected
Feb 12, 2026 - 18:15 vuln.today
Public exploit code
CVE Published
Jan 27, 2026 - 19:16 nvd
HIGH 8.1

DescriptionCVE.org

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.

AnalysisAI

GnuPG's gpg-agent fails to properly validate session key sizes in S/MIME messages, allowing remote attackers to trigger a stack buffer overflow via oversized CMS EnvelopedData payloads. Public exploit code exists for this vulnerability, which affects GnuPG versions before 2.5.17 and can be weaponized for denial of service or potentially remote code execution. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Craft malicious CMS EnvelopedData message
Exploit
Send to gpg-agent PKDECRYPT handler
Execution
Trigger stack buffer overflow
Impact
Execute arbitrary code or crash service
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Vulnerability AssessmentAI

Exploitation GnuPG before version 2.5.17 with gpg-agent running and configured to handle S/MIME CMS EnvelopedData messages; attacker must craft specific oversized wrapped session key structure in CMS message that reaches gpg-agent's PKDECRYPT--kem=CMS parser. Additional conditions and limiting factors are described in the full assessment.
Risk Assessment CVSS 8.1 (HIGH). … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario A remote attacker could exploit this vulnerability to remote code execution.
Remediation Monitor vendor advisories for a patch. … Detailed patch versions, workarounds, and compensating controls in full report.
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Recommended ActionAI

Within 24 hours: Identify all systems running GnuPG versions before 2.5.17 and assess their exposure to untrusted S/MIME messages; disable S/MIME processing where possible. …

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Vendor StatusVendor

SUSE

Severity: High
Product Status
openSUSE Tumbleweed Fixed
SLES15-SP5-CHOST-BYOS-SAP-CCloud Fixed
SLES15-SP6-CHOST-BYOS Fixed
SLES15-SP6-CHOST-BYOS-Aliyun Fixed
SLES15-SP6-CHOST-BYOS-Azure Fixed

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CVE-2026-24881 vulnerability details – vuln.today
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