Stack-based buffer overflow in gawk
CVE-2026-40553 is fixed in 6 products 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.
Buffer overflow vulnerability has been found in "extension/readdir.c" program file of gawk (ftype() routine). This issue could be used to crash the program and potentially to achieve code execution, although the latter has not been confirmed to be feasible. It affects gawk in versions 5.4.0 and below.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| gawk · RHEL 10 | 5.3.0-6.el10_2.1 | RHSA-2026:73429 | Jul 13, 2026 |
| gawk · RHEL 9 | 0:5.1.0-6.el9_8.1 | RHSA-2026:73512 | Sep 30, 2026 |
| gawk · Ubuntu 26.04.1 LTS (resolute) | 1:5.3.2-1ubuntu1.1 | gawk 1:5.3.2-1ubuntu1.1 | Jul 13, 2026 |
| gawk · almalinux 10 | 5.3.0-6.el10_2.1 | ALSA-2026:73429 | Sep 29, 2026 |
| gawk · almalinux 9 | 5.1.0-6.el9_8.1 | ALSA-2026:73512 | Sep 29, 2026 |
| gawk · amzn 2023 | 5.1.0-3.amzn2023.0.4 | ALAS2023-2026-2035 | Aug 3, 2026 |
| gawk · ol 10 | 0:5.3.0-6.el10_2.1 | ELSA-2026-73429 | Sep 30, 2026 |
| gawk · ol 9 | 0:5.1.0-6.el9_8.1 | ELSA-2026-73512 | Sep 30, 2026 |
| gawk · opensuse-leap 16.0 | 5.3.2-160000.3.1 | OPENSUSE-SU-2026:21393-1 | Jul 20, 2026 |
| gawk · rocky 10 | 0:5.3.0-6.el10_2.1 | RLSA-2026:73429 | Sep 30, 2026 |
| gawk · rocky 9 | 0:5.1.0-6.el9_8.1 | RLSA-2026:73512 | Sep 30, 2026 |
| gawk · sles 15.7 | 4.2.1-150000.3.6.1 | SUSE-SU-2026:3455-1 | Aug 3, 2026 |
| gawk · sles 16.0 | 5.3.2-160000.3.1 | SUSE-SU-2026:22831-1 | Jul 20, 2026 |
| gawk-all-langpacks · RHEL 9 | 0:5.1.0-6.el9_8.1 | RHSA-2026:73512 | Sep 30, 2026 |
| gawk-all-langpacks · almalinux 10 | 5.3.0-6.el10_2.1 | ALSA-2026:73429 | Sep 29, 2026 |
| gawk-all-langpacks · almalinux 9 | 5.1.0-6.el9_8.1 | ALSA-2026:73512 | Sep 29, 2026 |
| gawk-all-langpacks · amzn 2023 | 5.1.0-3.amzn2023.0.4 | ALAS2023-2026-2035 | Aug 3, 2026 |
| gawk-all-langpacks · ol 10 | 0:5.3.0-6.el10_2.1 | ELSA-2026-73429 | Sep 30, 2026 |
| gawk-all-langpacks · ol 9 | 0:5.1.0-6.el9_8.1 | ELSA-2026-73512 | Sep 30, 2026 |
| gawk-debuginfo · amzn 2023 | 5.1.0-3.amzn2023.0.4 | ALAS2023-2026-2035 | Aug 3, 2026 |
| gawk-debugsource · amzn 2023 | 5.1.0-3.amzn2023.0.4 | ALAS2023-2026-2035 | Aug 3, 2026 |
| gawk-devel · amzn 2023 | 5.1.0-3.amzn2023.0.4 | ALAS2023-2026-2035 | Aug 3, 2026 |
| gawk-doc · amzn 2023 | 5.1.0-3.amzn2023.0.4 | ALAS2023-2026-2035 | Aug 3, 2026 |
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