# DSA-5517-1: libx11 security update

DSA-5517-1, released October 5, 2023, fixes 1 CVE in libx11. None of them is reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/fix/linux/dsa-5517-1
- Platform: Linux
- Released: Oct 5, 2023
- Priority: High (Closes CVE-2023-43785, high severity)
- CVEs: 1, exploited: 0, on CISA KEV: 0
- Vendor advisory: https://security-tracker.debian.org/tracker/CVE-2023-43785

## Applies to

| Product | Release | Fixed in |
|---|---|---|
| [libx11](https://patchblox.com/security/data/product/linux/libx11.md) | Debian 11.6 (bullseye) | 2:1.7.2-1+deb11u2 |
| [libx11](https://patchblox.com/security/data/product/linux/libx11.md) | Debian 12.15 (bookworm) | 2:1.8.4-2+deb12u2 |

## CVEs this fix closes

| CVE | Priority | Title | CVSS | EPSS | Exploitation |
|---|---|---|---:|---:|---|
| [CVE-2023-43785](https://patchblox.com/security/data/cve/CVE-2023-43785.md) | High | libx11: A vulnerability was found in libX11 due to a boundary condition within the _XkbReadKeySyms() function | 7.8 | 0.0067 |  |

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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 Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo