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

Description

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.

Also Affects

Downstream vendors/products affected by this vulnerability

References

• https://ftp.gnu.org/gnu/tramp/tramp-2.8.2.tar.gz(product)
• https://www.openwall.com/lists/oss-security/2026/10/11/1(patch)
• https://www.openwall.com/lists/oss-security/2026/08/21/1(related)

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