CVE-2026-102473

Summary

A flaw was found in dash. When built without libc fnmatch, the internal pmatch() matcher implements * by unbounded recursion over candidate positions. A local user who can plant filenames, or otherwise feed that matcher, can make a short multi-star pattern such as ....*.tar.gz consume excessive CPU.

Affected Software

Weaknesses

• CWE-1333: Inefficient Regular Expression Complexity

Workarounds

Rebuild dash with –enable-fnmatch so pathname matching uses libc fnmatch. Until then, do not run dash globs, case, or ${var#pat} / ${var%pat} against attacker-controlled names with multi-star patterns. There is no upstream backtracking bound in the internal matcher.

References

• https://access.redhat.com/security/cve/CVE-2026-102473
• https://bugzilla.redhat.com/show_bug.cgi?id=2543005

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