# CVE-2026-11526: 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

CVE-2026-11526 is fixed in 4 products on 1 platform, first by libgd-perl 2.84-2ubuntu0.1, released June 14, 2026. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2026-11526
- Priority: High
- CVSS: 9.8 (Moderate)
- EPSS: 0.0135
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Jun 14, 2026
- Weakness: Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
- Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-11526

## Description

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.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | libgd-perl Debian 12.15 (bookworm) | 2.76-4+deb12u1 | [DEBIAN-CVE-2026-11526](https://patchblox.com/security/data/fix/linux/debian-cve-2026-11526.md) | Jun 24, 2026 |
| Linux | libgd-perl Debian 13.5 (trixie) | 2.78-1+deb13u1 | [DEBIAN-CVE-2026-11526](https://patchblox.com/security/data/fix/linux/debian-cve-2026-11526.md) | Jun 24, 2026 |
| Linux | libgd-perl Debian 14 | 2.84-3 | [DEBIAN-CVE-2026-11526](https://patchblox.com/security/data/fix/linux/debian-cve-2026-11526.md) | Jun 24, 2026 |
| Linux | libgd-perl Ubuntu 22.04.1 LTS (jammy) | 2.76-2ubuntu0.1 | [libgd-perl 2.76-2ubuntu0.1](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-libgd-perl-2.76-2ubuntu0.1.md) | Jul 3, 2026 |
| Linux | libgd-perl Ubuntu 24.04.5 LTS (noble) | 2.78-1ubuntu0.24.04.1 | [libgd-perl 2.78-1ubuntu0.24.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-noble-libgd-perl-2.78-1ubuntu0.24.04.1.md) | Jul 3, 2026 |
| Linux | libgd-perl Ubuntu 25.10 (questing) | 2.78-1ubuntu0.25.10.1 | [libgd-perl 2.78-1ubuntu0.25.10.1](https://patchblox.com/security/data/fix/linux/ubuntu-questing-libgd-perl-2.78-1ubuntu0.25.10.1.md) | Jul 3, 2026 |
| Linux | libgd-perl Ubuntu 26.04.1 LTS (resolute) | 2.84-2ubuntu0.1 | [libgd-perl 2.84-2ubuntu0.1](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-libgd-perl-2.84-2ubuntu0.1.md) | Jun 14, 2026 |
| Linux | perl-GD amzn 2023 | 2.80-1.amzn2023.0.3 | [ALAS2023-2026-1890](https://patchblox.com/security/data/fix/linux/alas2023-2026-1890.md) | Jun 22, 2026 |
| Linux | perl-GD-debuginfo amzn 2023 | 2.80-1.amzn2023.0.3 | [ALAS2023-2026-1890](https://patchblox.com/security/data/fix/linux/alas2023-2026-1890.md) | Jun 22, 2026 |
| Linux | perl-GD-debugsource amzn 2023 | 2.80-1.amzn2023.0.3 | [ALAS2023-2026-1890](https://patchblox.com/security/data/fix/linux/alas2023-2026-1890.md) | Jun 22, 2026 |

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Data as of 2026-11-09T01:18:40Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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