Description
Pillow is a Python imaging library. From 9.2.0 until 13.0.0, Pillow performs quadratic copying when saving a GIF with a long comment. _get_global_header() repeatedly copies portions of comment data while assembling the global header, including comments retained from an untrusted input image. An attacker can supply an image with a large GIF comment to an application that saves it as GIF. This can consume excessive CPU and delay or deny service. This issue is fixed in version 13.0.0.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| python-pillow | Pillow | >= 9.2.0, < 13.0.0 | — |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | pillow | No fix yet | — |
| Debian 13 | pillow | No fix yet | — |
| Debian 12 | pillow | No fix yet | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 26.10 | pillow | 12.3.0-1ubuntu2 | USN-9064-1 |
| Ubuntu 26.04 LTS | pillow | 12.1.1-2ubuntu1.5 | USN-9064-1 |
| Ubuntu 24.04 LTS | pillow | 10.2.0-1ubuntu1.5 | USN-9064-1 |
| Ubuntu 22.04 LTS | pillow | 9.0.1-1ubuntu0.7 | USN-9064-1 |
Show 4 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro 20.04 LTS | pillow | 7.0.0-4ubuntu0.9+esm2 | USN-9064-1 |
| Ubuntu Pro 20.04 LTS | pillow-python2 | No fix yet | — |
| Ubuntu Pro 18.04 LTS | pillow | 5.1.0-1ubuntu0.8+esm3 | USN-9064-1 |
| Ubuntu Pro 16.04 LTS | pillow | 3.1.2-0ubuntu1.6+esm4 | USN-9064-1 |
| Ubuntu Pro 14.04 LTS | pillow | 2.3.0-1ubuntu3.4+esm6 | USN-9064-1 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP7 | python-Pillow | 7.2.0-150300.3.33.1 | SUSE-SU-2026:5038-1 |
| SLES 15 SP6 | python-Pillow | 9.5.0-150400.5.28.1 | SUSE-SU-2026:5194-1 |
| SLES 15 SP5 | python-Pillow | 9.5.0-150400.5.28.1 | SUSE-SU-2026:5194-1 |
| SLES 15 SP4 | python-Pillow | 9.5.0-150400.5.28.1 | SUSE-SU-2026:5194-1 |
| SLES 3 | python-Pillow | 9.5.0-150400.5.28.1 | SUSE-SU-2026:5194-1 |
Show 7 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES for SAP 16.0 | python-Pillow | 11.3.0-160000.9.1 | SUSE-SU-2026:24656-1 |
| SLES for SAP 15 SP6 | python-Pillow | 9.5.0-150400.5.28.1 | SUSE-SU-2026:5194-1 |
| SLES for SAP 15 SP5 | python-Pillow | 9.5.0-150400.5.28.1 | SUSE-SU-2026:5194-1 |
| SLES for SAP 15 SP4 | python-Pillow | 9.5.0-150400.5.28.1 | SUSE-SU-2026:5194-1 |
| SLES 16.0 | python-Pillow | 11.3.0-160000.9.1 | SUSE-SU-2026:24656-1 |
| SLE HPC 15 SP5 | python-Pillow | 9.5.0-150400.5.28.1 | SUSE-SU-2026:5194-1 |
| SLE HPC 15 SP4 | python-Pillow | 9.5.0-150400.5.28.1 | SUSE-SU-2026:5194-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Leap 16.0 | python-Pillow | 11.3.0-160000.9.1 | openSUSE-SU-2026:22246-1 |
Wolfi
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Wolfi rolling | open-webui | 0.12.3-r6 | — |
| Wolfi rolling | py3.10-pillow | No fix yet | — |
| Wolfi rolling | py3.11-pillow +2 | 13.0.0-r0 | — |
Affected packages
| Ecosystem | Package | Affected | Fixed | Record |
|---|---|---|---|---|
| PyPI | pillow | >= 9.2.0, < 13.0.0 | 13.0.0 | GHSA-fc9g-5qg7-mf45 |
Advisories 5
- USN-9064-1 pillow vulnerabilities Ubuntu Security Notices (USN) · Nov 13, 2026
- SUSE-SU-2026:24656-1 Security update for python-Pillow SUSE / openSUSE Security Updates · Nov 12, 2026
- SUSE-SU-2026:5194-1 Security update for python-Pillow SUSE / openSUSE Security Updates · Nov 12, 2026
- openSUSE-SU-2026:22246-1 Security update for python-Pillow SUSE / openSUSE Security Updates · Nov 11, 2026
- SUSE-SU-2026:5038-1 Security update for python-Pillow SUSE / openSUSE Security Updates · Nov 3, 2026