# CVE-2015-20109: glibc: end_pattern (called from internal_fnmatch) in the GNU C Library (aka glibc or libc6) before 2.22 might allow context-...

CVE-2015-20109 is fixed in glibc on 1 platform, first by DEBIAN-CVE-2015-20109, released June 25, 2023. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2015-20109
- Priority: Routine
- CVSS: 5.5 (medium)
- EPSS: 0.0032
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Jun 25, 2023

## Description

end_pattern (called from internal_fnmatch) in the GNU C Library (aka glibc or libc6) before 2.22 might allow context-dependent attackers to cause a denial of service (application crash), as demonstrated by use of the fnmatch library function with the **(!() pattern. NOTE: this is not the same as CVE-2015-8984; also, some Linux distributions have fixed CVE-2015-8984 but have not fixed this additional fnmatch issue.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | glibc Debian 12.15 (bookworm) | 2.22-1 | [DEBIAN-CVE-2015-20109](https://patchblox.com/security/data/fix/linux/debian-cve-2015-20109.md) | Jun 25, 2023 |
| Linux | glibc Debian 13.5 (trixie) | 2.22-1 | [DEBIAN-CVE-2015-20109](https://patchblox.com/security/data/fix/linux/debian-cve-2015-20109.md) | Jun 25, 2023 |
| Linux | glibc Debian 14 | 2.22-1 | [DEBIAN-CVE-2015-20109](https://patchblox.com/security/data/fix/linux/debian-cve-2015-20109.md) | Jun 25, 2023 |

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Data as of 2026-11-07T06:34:28Z 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 Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo