CVE-2026-102474

A flaw was found in dash. The printf builtin reserves four bytes before converting a Unicode \u or \U escape, but the multi-byte token can need five or six bytes. A local user who can supply such an escape to dash printf or echo %b, including through dash -c and a positional argument, can write one or two bytes past that reservation.

• CWE-787

• https://access.redhat.com/security/cve/CVE-2026-102474
• https://bugzilla.redhat.com/show_bug.cgi?id=2543004

Published

Sep 29, 2026

Last Modified

Nov 5, 2026

Status

Awaiting Analysis

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