TI-2026-20067 Aliases CVE-2026-24881 GHSA-5w36-x85h-pphm

Stack-based buffer overflow in GnuPG

MEDIUM 46CWE-121Published 2026-01-27 · Updated 2026-07-15

Key facts

Attack vector: Network
Privileges required: None
User interaction: None
Attack complexity: Low
Impact type: Code execution
Confidentiality · integrity · availability: High · High · High
Fix status: Partial Red Hat: 1 without a fix

Attack profile from CVSS 3.1 · NVD. Fix status from CNA and Red Hat. Impact type from CWE-121 and the CVSS impact.

Summary

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.01813 78th percentileScored 2026-11-07

Public exploit Yes 1 exploit referenceTagged by NVD

Fix Partial GnuPG (GnuPG): 2.5.17Red Hat: 1 without a fix

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: None
Automatable: No
Technical impact: Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
GnuPG	GnuPG	2.5.13 to before 2.5.17	2.5.17	Patch available	CNA

GnuPG VendorGnuPG Affected 2.5.13 to before 2.5.17 Fixed in 2.5.17 Patch available CNA

CPE configurations NVD · 2

CPE	Versions	Role	Vendor
cpe:2.3:a:gnupg:gnupg:::::-:::*	2.5.13 to before 2.5.17	Vulnerable	GnuPG
cpe:2.3:a:gpg4win:gpg4win::::::::	5.0.0 to before 5.0.1	Vulnerable	Gpg4win

cpe:2.3:a:gnupg:gnupg:*:*:*:*:-:*:*:* Versions 2.5.13 to before 2.5.17 Vulnerable ·GnuPG
cpe:2.3:a:gpg4win:gpg4win:*:*:*:*:*:*:*:* Versions 5.0.0 to before 5.0.1 Vulnerable ·Gpg4win

Remediation

Fix · CNA GnuPG (GnuPG) Fixed in 2.5.17

Fixed in the same release

Records fixed by the same vendor advisory or release, as the CNA lists them.

Release · 2026-01-27
GnuPG 2.5.17
3 records Highest priority Priority MEDIUM 1 MEDIUM, 2 LOW
Other records, highest priority first
- TI-2026-20068 Stack-based buffer overflow in GnuPGPriority LOW 39
- TI-2026-20069 NULL pointer dereference in GnuPGPriority LOW 25
Show all 3 records →

Vendor assessments

Red Hat

Red Hat rating: Important. Red Hat's page for this CVE →

Product	Status	Plan or fix
Red Hat Enterprise Linux 6	Affected	No fix planned: Will not fix

Not affected: 4 products

Red Hat Enterprise Linux 10
Red Hat Enterprise Linux 7
Red Hat Enterprise Linux 8
Red Hat Enterprise Linux 9

Timeline

2026-10-02 Threatist record created from CVE-2026-24881
2026-10-03 Alias added: GHSA-5w36-x85h-pphm

References

Exploit 1

https://dev.gnupg.org/T8044

Advisory 1

https://www.openwall.com/lists/oss-security/2026/01/27/8

TI-2022-03243 Integer overflow in libksba CVSS 3.1CRITICAL 9.8
TI-2025-42429 Out-of-bounds write in GnuPG CVSS 3.1HIGH 7.8
TI-2025-42428 Improper signature verification in GnuPG CVSS 3.1MEDIUM 5.9
TI-2008-01464 GnuPG (gpg) 1.4.8 and 2.0.8 allows remote attackers to cause a denial of service (crash)… CVSS 2.0HIGH 9.3
TI-2018-08614 mainproc.c in GnuPG before 2.2.8 mishandles the original filename during decryption and… CVSS 3.1HIGH 7.5
TI-2010-02445 Use-after-free vulnerability in kbx/keybox-blob.c in GPGSM in GnuPG 2.x through 2.0.16… CVSS 3.1HIGH 8.1

See all 34 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences