# DSA-6105-1: modsecurity-crs security update

DSA-6105-1, released January 21, 2026, fixes 1 CVE in modsecurity-crs. None of them is reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/fix/linux/dsa-6105-1
- Platform: Linux
- Released: Jan 21, 2026
- Priority: Routine (Closes CVE-2026-21876)
- CVEs: 1, exploited: 0, on CISA KEV: 0
- Vendor advisory: https://security-tracker.debian.org/tracker/CVE-2026-21876

## Applies to

| Product | Release | Fixed in |
|---|---|---|
| [modsecurity-crs](https://patchblox.com/security/data/product/linux/modsecurity-crs.md) | Debian 12.15 (bookworm) | 3.3.4-1+deb12u1 |
| [modsecurity-crs](https://patchblox.com/security/data/product/linux/modsecurity-crs.md) | Debian 13.5 (trixie) | 3.3.7-1+deb13u1 |

## CVEs this fix closes

| CVE | Priority | Title | CVSS | EPSS | Exploitation |
|---|---|---|---:|---:|---|
| [CVE-2026-21876](https://patchblox.com/security/data/cve/CVE-2026-21876.md) | Routine | modsecurity-crs: modsecurity-crs - security update | 5.3 | 0.1775 |  |

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Data as of 2026-11-07T12:40:37Z 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 Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo