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Vulnerability record · CVE-2026-24881 · published 27 January 2026

CVE-2026-24881: Gnupg stack-based buffer overflow vulnerability

Gnupg · Gnupg

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.

9.8 CVSS 3.1 Critical EPSS 1.8% · top 21.9% CWE-121 · Stack-based buffer overflow
9.8CVSS 3.1 base score
1.8%EPSS exploitation probability, 30 days
NoNot in CISA KEV
2Affected product versions listed by NVD
5References, 1 tagged exploit
15 Jul 2026Last modified by NVD

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.

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

Affected products

2 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://dev.gnupg.org/T8044 ExploitProduct
https://www.openwall.com/lists/oss-security/2026/01/27/8 Mailing ListThird Party Advisory
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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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

10.0CVE-2006-6235Gnu privacy guard vulnerabilityA "stack overwrite" vulnerability in GnuPG (gpg) 1.x before 1.4.6, 2.x before 2.0.2, and 1.9.0 through 1.9.95 allows attackers to execute arbitrary c…EPSS 5.9%9.8CVE-2022-3515Gnupg libksba integer overflow vulnerabilityA vulnerability was found in the Libksba library due to an integer overflow within the CRL parser. The vulnerability can be exploited remotely for co…EPSS 1.6%9.3CVE-2008-1530Gnupg vulnerabilityGnuPG (gpg) 1.4.8 and 2.0.8 allows remote attackers to cause a denial of service (crash) and possibly execute arbitrary code via crafted duplicate ke…EPSS 4.3%8.8CVE-2018-1000858Gnupg cross-site request forgery vulnerabilityGnuPG version 2.1.12 - 2.2.11 contains a Cross ite Request Forgery (CSRF) vulnerability in dirmngr that can result in Attacker controlled CSRF, Infor…EPSS 1.0%8.1CVE-2010-2547Gnupg use after free vulnerabilityUse-after-free vulnerability in kbx/keybox-blob.c in GPGSM in GnuPG 2.x through 2.0.16 allows remote attackers to cause a denial of service (crash) a…EPSS 5.3%7.8CVE-2026-24882Gnupg stack-based buffer overflow vulnerabilityIn GnuPG before 2.5.17, a stack-based buffer overflow exists in tpm2daemon during handling of the PKDECRYPT command for TPM-backed RSA and ECC keys.EPSS 0.44%7.8CVE-2020-25125Gnupg classic buffer overflow vulnerabilityGnuPG 2.2.21 and 2.2.22 (and Gpg4win 3.1.12) has an array overflow, leading to a crash or possibly unspecified other impact, when a victim imports an…EPSS 1.3%7.5CVE-2019-14855Gnupg inadequate encryption strength vulnerabilityA flaw was found in the way certificate signatures could be forged using collisions found in the SHA-1 algorithm. An attacker could use this weakness…EPSS 1.1%

Source: NIST National Vulnerability Database (record CVE-2026-24881), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.