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Fencer Intel
high 8.1

CVE-2026-24881 json

In GnuPG before 2.5.17, a crafted CMS (S/MIME) EnvelopedData message carrying an oversized wrapped...

published 9mo ago modified 3mo ago also EUVD-2026-4768 , GHSA-5w36-x85h-pphm , JLSEC-2026-564

cvss
8.1
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
1.8%
EPSS 1.8% chance of exploitation in 30 days, percentile 78%
public exploits
0
none known

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.

Patch / fix

  • julia GnuPG_jll 2.5.17+0
  • GnuPG GnuPG 2.5.17
  • gpg2 openSUSE Tumbleweed 2.5.17-1.1

opensuse advisories openSUSE-SU-2026:10112-1

Is CVE-2026-24881 in your dependencies? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.

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Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-24881 updated cvss 8.1

GnuPG: GnuPG: Remote code execution and denial of service via crafted CMS EnvelopedData message

  • Red Hat Enterprise Linux 6 gnupg2, gnupg2-smime
    affected: workaround, no fix planned “Will not fix”
  • Red Hat Enterprise Linux 7 gnupg2, gnupg2-smime Red Hat Enterprise Linux 8 gnupg2, gnupg2-smime Red Hat Enterprise Linux 9 gnupg2, gnupg2-smime Red Hat Enterprise Linux 10 gnupg2
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
total
Assessed
9mo ago

Exploit prediction

1.81% chance of exploitation in the next 30 days, higher than 78% of all scored CVEs (FIRST EPSS, 2026-11-09).

Exploits and checks

  • dev.gnupg.org https://dev.gnupg.org/T8044 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CNA 3.1 8.1 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
CISA ADP 3.1 8.1 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
NVD 3.1 9.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
OSV 3.1 9.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected packages

ecosystem package affected fixed in
julia GnuPG_jll
>=2.5.16+0, <2.5.17+0
2.5.17+0

Affected products

  • GnuPG GnuPG
  • Red Hat Red Hat Enterprise Linux 10
  • Red Hat Red Hat Enterprise Linux 6
  • Red Hat Red Hat Enterprise Linux 7
  • Red Hat Red Hat Enterprise Linux 8
  • Red Hat Red Hat Enterprise Linux 9

Classification

Weakness
  • CWE-121 Stack-based Buffer Overflow

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.