Skip to content
Fencer Vulns
critical 9.8

CVE-2026-11526 json

GD versions before 2.86 for Perl allow OS command injection and file overwrite via a 2-arg open() of filename arguments in _make_filehandle

published 2026-06-14 4 mo ago modified 2026-07-23 3 mo ago also EUVD-2026-36659

cvss
9.8
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
1.4%
EPSS 1.4% chance of exploitation in 30 days, percentile 71%
public exploits
0
none known

Summary

GD versions before 2.86 for Perl allow OS command injection and file overwrite via a 2-arg open() of filename arguments in _make_filehandle.

GD::Image::_make_filehandle opens a filename argument with Perl's 2-arg open(), so a filename that begins or ends with a pipe ("| cmd", "cmd |") or begins with a redirect ("> path", ">> path") is run as a command or redirect rather than opened as a file. _make_filehandle is the single open path behind every filename-accepting constructor (new, newFromPng, newFromJpeg, and the rest); the in-memory *Data variants do not open a path and are unaffected.

Any caller that forwards untrusted input to one of these constructors as a pathname can run an arbitrary command or truncate a file under the process UID.

Patch / fix

  • RURBAN GD 2.86
  • libgd-perl Debian 12 2.76-4+deb12u1
  • libgd-perl Debian 13 2.78-1+deb13u1
  • libgd-perl Debian 14 2.84-3

debian advisories DEBIAN-CVE-2026-11526

  • libgd-perl Ubuntu 22.04 LTS 2.76-2ubuntu0.1
  • libgd-perl Ubuntu 24.04 LTS 2.78-1ubuntu0.24.04.1
  • libgd-perl Ubuntu 25.10 2.78-1ubuntu0.25.10.1
  • libgd-perl Ubuntu 26.04 LTS 2.84-2ubuntu0.1

ubuntu advisories UBUNTU-CVE-2026-11526

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • perl-GD RHEL 7 ELS 2.49-3.el7_9.1

red hat advisories RHSA-2026:49758

  • perl-GD openSUSE Tumbleweed 2.860.0-1.1

opensuse advisories openSUSE-SU-2026:11017-1

  • perl-gd Alpine 3.24, Alpine 3.23, Alpine 3.22 +1 more 2.86-r0

alpine advisories ALPINE-CVE-2026-11526

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

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-2026-11526 updated cvss 9.8

perl-GD: perl-GD: Arbitrary command execution and file overwrite via crafted filenames

  • Red Hat Enterprise Linux 6 perl-GD 2.44-3.el6
    affected: workaround, no fix planned “Out of support scope”
  • Red Hat Enterprise Linux Server (v. 7 ELS) perl-GD 2.49-3.el7_9.1
    fixed: vendor fix RHSA-2026:49758

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
yes
Technical impact
total
Assessed
4 mo ago

Exploit prediction

1.35% chance of exploitation in the next 30 days, higher than 71% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

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

Affected products

  • RURBAN GD

Classification

Weakness
  • CWE-78 Improper Neutralization of Special Elements used in an OS Command
  • CWE-73 External Control of File Name or Path

References

Sources

Fencer Vulns 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.