# CVE-2026-40469: gawk: Integer overflow vulnerability has been found in "builtin.c" program file of gawk (do_sub() routine)

CVE-2026-40469 is fixed in gawk on 1 platform, first by gawk 1:5.3.2-1ubuntu1.1, released July 13, 2026. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2026-40469
- Priority: Routine
- CVSS: n/a (Medium)
- EPSS: 0.0021
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Jul 13, 2026

## Description

Integer overflow vulnerability has been found in "builtin.c" program file of gawk (do_sub() routine). This issue could be used to overwrite gawk heap metadata and objects causing the program to crash. It affects 32-bit builds of gawk in versions 5.4.0 and below.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | gawk Ubuntu 18.04.6 LTS (bionic) | 1:4.1.4+dfsg-1ubuntu0.1~esm2 | [gawk 1:4.1.4+dfsg-1ubuntu0.1~esm2](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-gawk-1-4.1.4-dfsg-1ubuntu0.1-esm2.md) | Jul 24, 2026 |
| Linux | gawk Ubuntu 20.04 LTS (focal) | 1:5.0.1+dfsg-1ubuntu0.1+esm1 | [gawk 1:5.0.1+dfsg-1ubuntu0.1+esm1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-gawk-1-5.0.1-dfsg-1ubuntu0.1-esm1.md) | Jul 24, 2026 |
| Linux | gawk Ubuntu 22.04.1 LTS (jammy) | 1:5.1.0-1ubuntu0.2 | [gawk 1:5.1.0-1ubuntu0.2](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-gawk-1-5.1.0-1ubuntu0.2.md) | Jul 24, 2026 |
| Linux | gawk Ubuntu 24.04.5 LTS (noble) | 1:5.2.1-2ubuntu0.1 | [gawk 1:5.2.1-2ubuntu0.1](https://patchblox.com/security/data/fix/linux/ubuntu-noble-gawk-1-5.2.1-2ubuntu0.1.md) | Jul 24, 2026 |
| Linux | gawk Ubuntu 26.04.1 LTS (resolute) | 1:5.3.2-1ubuntu1.1 | [gawk 1:5.3.2-1ubuntu1.1](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-gawk-1-5.3.2-1ubuntu1.1.md) | Jul 13, 2026 |

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Data as of 2026-11-08T00:53:09Z 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 Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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