# CVE-2021-40633: giflib: A memory leak (out-of-memory) in gif2rgb in util/gif2rgb.c in giflib 5.1.4 allows remote attackers trigger an out of...

CVE-2021-40633 is fixed in 3 products on 1 platform, first by giflib-tools 5.1.9-2ubuntu0.1, released June 14, 2022. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2021-40633
- Priority: High
- CVSS: 8.8 (high)
- EPSS: 0.0172
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Jun 14, 2022

## Description

A memory leak (out-of-memory) in gif2rgb in util/gif2rgb.c in giflib 5.1.4 allows remote attackers trigger an out of memory exception or denial of service via a gif format file.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | giflib Debian 13.5 (trixie) | 5.2.2-1 | [DEBIAN-CVE-2021-40633](https://patchblox.com/security/data/fix/linux/debian-cve-2021-40633.md) | Jun 14, 2022 |
| Linux | giflib Debian 14 | 5.2.2-1 | [DEBIAN-CVE-2021-40633](https://patchblox.com/security/data/fix/linux/debian-cve-2021-40633.md) | Jun 14, 2022 |
| Linux | giflib-tools Ubuntu 18.04.6 LTS (bionic) | 5.1.4-2ubuntu0.1+esm1 | [giflib-tools 5.1.4-2ubuntu0.1+esm1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-giflib-tools-5.1.4-2ubuntu0.1-esm1.md) | Aug 25, 2023 |
| Linux | giflib-tools Ubuntu 20.04 LTS (focal) | 5.1.9-1ubuntu0.1 | [giflib-tools 5.1.9-1ubuntu0.1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-giflib-tools-5.1.9-1ubuntu0.1.md) | Aug 25, 2023 |
| Linux | giflib-tools Ubuntu 22.04.1 LTS (jammy) | 5.1.9-2ubuntu0.1 | [giflib-tools 5.1.9-2ubuntu0.1](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-giflib-tools-5.1.9-2ubuntu0.1.md) | Jun 14, 2022 |
| Linux | libgif7 Ubuntu 18.04.6 LTS (bionic) | 5.1.4-2ubuntu0.1+esm1 | [libgif7 5.1.4-2ubuntu0.1+esm1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-libgif7-5.1.4-2ubuntu0.1-esm1.md) | Aug 25, 2023 |
| Linux | libgif7 Ubuntu 20.04 LTS (focal) | 5.1.9-1ubuntu0.1 | [libgif7 5.1.9-1ubuntu0.1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-libgif7-5.1.9-1ubuntu0.1.md) | Aug 25, 2023 |
| Linux | libgif7 Ubuntu 22.04.1 LTS (jammy) | 5.1.9-2ubuntu0.1 | [libgif7 5.1.9-2ubuntu0.1](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-libgif7-5.1.9-2ubuntu0.1.md) | Jun 14, 2022 |

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Data as of 2026-11-08T19:12:23Z 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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