# libx11-data 2:1.6.4-3ubuntu0.4+esm3: libx11-data 2:1.6.4-3ubuntu0.4+esm3 for Ubuntu 18.04.6 LTS (bionic)

libx11-data 2:1.6.4-3ubuntu0.4+esm3, released October 13, 2026, fixes 4 CVEs in libx11-data. None of them is reported as exploited. Patch Radar priority: High. The product is no longer supported.

- Web page: https://patchblox.com/security/fix/linux/ubuntu-bionic-libx11-data-2-1.6.4-3ubuntu0.4-esm3
- Platform: Linux
- Released: Oct 13, 2026
- Priority: High (Closes CVE-2026-88806, high severity)
- CVEs: 4, exploited: 0, on CISA KEV: 0

## Applies to

| Product | Release | Fixed in |
|---|---|---|
| [libx11-data](https://patchblox.com/security/data/product/linux/libx11-data.md) | Ubuntu 18.04.6 LTS (bionic) | 2:1.6.4-3ubuntu0.4+esm3 |

## CVEs this fix closes

| CVE | Priority | Title | CVSS | EPSS | Exploitation |
|---|---|---|---:|---:|---|
| [CVE-2026-88806](https://patchblox.com/security/data/cve/CVE-2026-88806.md) | High | libX11 XkbGetMap Reply Heap-based Buffer Overflow | 7.5 | 0.0020 |  |
| [CVE-2026-94283](https://patchblox.com/security/data/cve/CVE-2026-94283.md) | Routine | Out-of-bounds read vulnerability in libX11's XIM (X Input Method) attribute parser | 6.5 | 0.0021 |  |
| [CVE-2026-94285](https://patchblox.com/security/data/cve/CVE-2026-94285.md) | Routine | Out-of-bounds read in libX11's byte-oriented codeset parser | 5.1 | 0.0015 |  |
| [CVE-2026-94284](https://patchblox.com/security/data/cve/CVE-2026-94284.md) | Routine | Out-of-bounds read vulnerability in libX11's XIM trigger-keyregistration parser.registration parser | 5.5 | 0.0013 |  |

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Data as of 2026-11-12T07:53:35Z 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 Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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