Medium [CVE-2026-102473] Super-polynomial backtracking in pmatch when libc fnmatch is disabled
This medium-severity Red Hat Linux advisory covers CVE-2026-102473; related products: Red Hat Enterprise Linux 6, Red Hat package: dash.
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Summary
Super-polynomial backtracking in pmatch when libc fnmatch is disabled. Red Hat rates this moderate (CVSS 5.5).
Weakness: CWE-1333.
Affected products named by the advisory: Red Hat Enterprise Linux 6; Red Hat package: dash.
Affected versions
No affected-version range was extracted from the source record. The vendor advisory is authoritative — check it before change work.
Official advisory · high-confidence parse· fetched 2 days ago·verify at source
Fixed versions
No fixed release is recorded yet. That does not prove no patch exists — confirm against the vendor advisory.
Official advisory · high-confidence parse· fetched 2 days ago·verify at source
Mitigation checklist
- 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.
Official advisory · high-confidence parse· fetched 2 days ago·verify at source
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