# CVE-2026-108976: GNU Emacs before 31.2 (and TRAMP through 2.8.2) allows OS command injection via a filename because tramp-user-regexp has an incomplete list of disallowed inputs. NOTE: this issue exists because of an incomplete fix for CVE-2026-79992.

CVE-2026-108976 is fixed in 12 products on 1 platform, first by SUSE-SU-2026:4893-1, released November 7, 2026. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2026-108976
- Priority: High
- CVSS: 7.8 (Important)
- EPSS: 0.0065
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Oct 13, 2026
- Weakness: Incomplete List of Disallowed Inputs
- Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-108976

## Description

This update for emacs fixes the following issues:  - CVE-2026-79992: zero-click local command execution via TRAMP (bsc#1275927). - CVE-2026-108976: flawed username input regex validation in TRAMP can cause arbitrary OS command injection   (bsc#1284345, bsc#1284990).

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | emacs amzn 2023 | 1:28.2-3.amzn2023.0.13 | [ALAS2023-2026-3338](https://patchblox.com/security/data/fix/linux/alas2023-2026-3338.md) | Nov 7, 2026 |
| Linux | emacs sles 15.6 | 27.2-150400.3.37.1 | [SUSE-SU-2026:4893-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-4893-1.md) | Nov 7, 2026 |
| Linux | emacs sles 15.7 | 27.2-150400.3.37.1 | [SUSE-SU-2026:4893-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-4893-1.md) | Nov 7, 2026 |
| Linux | emacs-common amzn 2023 | 1:28.2-3.amzn2023.0.13 | [ALAS2023-2026-3338](https://patchblox.com/security/data/fix/linux/alas2023-2026-3338.md) | Nov 7, 2026 |
| Linux | emacs-common-debuginfo amzn 2023 | 1:28.2-3.amzn2023.0.13 | [ALAS2023-2026-3338](https://patchblox.com/security/data/fix/linux/alas2023-2026-3338.md) | Nov 7, 2026 |
| Linux | emacs-debuginfo amzn 2023 | 1:28.2-3.amzn2023.0.13 | [ALAS2023-2026-3338](https://patchblox.com/security/data/fix/linux/alas2023-2026-3338.md) | Nov 7, 2026 |
| Linux | emacs-debugsource amzn 2023 | 1:28.2-3.amzn2023.0.13 | [ALAS2023-2026-3338](https://patchblox.com/security/data/fix/linux/alas2023-2026-3338.md) | Nov 7, 2026 |
| Linux | emacs-devel amzn 2023 | 1:28.2-3.amzn2023.0.13 | [ALAS2023-2026-3338](https://patchblox.com/security/data/fix/linux/alas2023-2026-3338.md) | Nov 7, 2026 |
| Linux | emacs-filesystem amzn 2023 | 1:28.2-3.amzn2023.0.13 | [ALAS2023-2026-3338](https://patchblox.com/security/data/fix/linux/alas2023-2026-3338.md) | Nov 7, 2026 |
| Linux | emacs-lucid amzn 2023 | 1:28.2-3.amzn2023.0.13 | [ALAS2023-2026-3338](https://patchblox.com/security/data/fix/linux/alas2023-2026-3338.md) | Nov 7, 2026 |
| Linux | emacs-lucid-debuginfo amzn 2023 | 1:28.2-3.amzn2023.0.13 | [ALAS2023-2026-3338](https://patchblox.com/security/data/fix/linux/alas2023-2026-3338.md) | Nov 7, 2026 |
| Linux | emacs-nox amzn 2023 | 1:28.2-3.amzn2023.0.13 | [ALAS2023-2026-3338](https://patchblox.com/security/data/fix/linux/alas2023-2026-3338.md) | Nov 7, 2026 |
| Linux | emacs-nox-debuginfo amzn 2023 | 1:28.2-3.amzn2023.0.13 | [ALAS2023-2026-3338](https://patchblox.com/security/data/fix/linux/alas2023-2026-3338.md) | Nov 7, 2026 |
| Linux | emacs-terminal amzn 2023 | 1:28.2-3.amzn2023.0.13 | [ALAS2023-2026-3338](https://patchblox.com/security/data/fix/linux/alas2023-2026-3338.md) | Nov 7, 2026 |

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Data as of 2026-11-10T13:56:55Z 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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