CVE-2026-117680 LOW 2.1
Published: 2026-11-01 14:18:51 UTC · CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Categories:
Improper Check for Unusual or Exceptional Conditions vulnerability in the pattern and patternProperties keywords in lud jsv allows an unauthenticated remote attacker to bypass schema validation via a string that matches a schema regex only after heavy backtracking. JSV.Helpers.RegexExt.bounded_match?/2 runs schema regexes with a backtracking budget but calls :re.run/3 without :report_errors, so a match that exhausts the budget returns the same :nomatch as a real non-match. A key that matches a patternProperties regex is then checked against additionalProperties or not at all, and a string that matches a not subschema with a pattern is accepted. Before the budget existed, Regex.match?/2 failed the same way at Erlang's default match limit.
Only schemas whose regex explores a catastrophic branch before the branch that matches are affected. The attacker controls the data, not the schema, and linear patterns never exhaust the budget.
This issue affects jsv: from 0.1.0 before 0.26.2.
Weakness: CWE-754
References
- https://cna.erlef.org/cves/CVE-2026-117680.html
- https://github.com/lud/jsv/commit/302a5d0803468f81a1cf08e3b67d8b14cee759ca
- https://github.com/lud/jsv/commit/defdb8a68ac7f218aa5dfe85190d484017cb8817
- https://github.com/lud/jsv/security/advisories/GHSA-cvmg-hgv6-jqcp
- https://osv.dev/vulnerability/EEF-CVE-2026-117680
- https://github.com/lud/jsv/security/advisories/GHSA-cvmg-hgv6-jqcp