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.

High

CVSS

7.8

Important

Exploitation

None reported

No vendor assessment

CISA KEV

Not listed

Not in the Known Exploited Vulnerabilities catalog

EPSS

0.0065

51st percentile

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

Product	Fixed in	Fix	Released
Linux
emacs · amzn 2023	1:28.2-3.amzn2023.0.13	ALAS2023-2026-3338	Nov 7, 2026
emacs · sles 15.6	27.2-150400.3.37.1	SUSE-SU-2026:4893-1	Nov 7, 2026
emacs · sles 15.7	27.2-150400.3.37.1	SUSE-SU-2026:4893-1	Nov 7, 2026
emacs-common · amzn 2023	1:28.2-3.amzn2023.0.13	ALAS2023-2026-3338	Nov 7, 2026
emacs-common-debuginfo · amzn 2023	1:28.2-3.amzn2023.0.13	ALAS2023-2026-3338	Nov 7, 2026
emacs-debuginfo · amzn 2023	1:28.2-3.amzn2023.0.13	ALAS2023-2026-3338	Nov 7, 2026
emacs-debugsource · amzn 2023	1:28.2-3.amzn2023.0.13	ALAS2023-2026-3338	Nov 7, 2026
emacs-devel · amzn 2023	1:28.2-3.amzn2023.0.13	ALAS2023-2026-3338	Nov 7, 2026
emacs-filesystem · amzn 2023	1:28.2-3.amzn2023.0.13	ALAS2023-2026-3338	Nov 7, 2026
emacs-lucid · amzn 2023	1:28.2-3.amzn2023.0.13	ALAS2023-2026-3338	Nov 7, 2026
emacs-lucid-debuginfo · amzn 2023	1:28.2-3.amzn2023.0.13	ALAS2023-2026-3338	Nov 7, 2026
emacs-nox · amzn 2023	1:28.2-3.amzn2023.0.13	ALAS2023-2026-3338	Nov 7, 2026
emacs-nox-debuginfo · amzn 2023	1:28.2-3.amzn2023.0.13	ALAS2023-2026-3338	Nov 7, 2026
emacs-terminal · amzn 2023	1:28.2-3.amzn2023.0.13	ALAS2023-2026-3338	Nov 7, 2026

Details

Published
October 13, 2026
Weakness
Incomplete List of Disallowed Inputs
Vendor advisory
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-108976

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