Low · CVSS 2.1CVE-2026-117680

jsv treats regex match budget exhaustion as a non-match, bypassing patternProperties and notCVE-2026-117680

Answer in brief

CVE-2026-117680 records a Low severity (CVSS 2.1) vulnerability in jsv treats regex match budget exhaustion as a non-match, bypassing patternProperties and not. The current sources do not mark it as known exploited. The current feed maps lud/jsv (generic), lud/lud/jsv (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Nov 1, 2026Updated Nov 1, 2026Source checked Nov 1, 2026First seen by HOL Nov 1, 2026Material review Nov 1, 2026

Upstream Advisory

Key facts

Risk: Low · CVSS 2.1
Exploitation: Not marked as known exploited
Affected software: 2 mapped packages or products
Fix availability: Available

Why this deserves its current priority

CVSS is 2.1. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps lud/jsv (generic), lud/lud/jsv (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
lud/jsvgeneric	>=0.1.0 <0.26.2	0.26.2
lud/lud/jsvgeneric	>=302a5d0803468f81a1cf08e3b67d8b14cee759ca <defdb8a68ac7f218aa5dfe85190d484017cb8817	defdb8a68ac7f218aa5dfe85190d484017cb8817

Recommended response

Check inventory. Check lockfiles and deployed manifests for lud/jsv, lud/lud/jsv.
Review the reported fix. Source-reported workaround: Pair patternProperties with additionalProperties: false. A key whose match exhausts the budget is then rejected instead of accepted unchecked. Valid keys that need heavy backtracking are rejected as well. Write schema regexes without nested quantifiers or overlapping alternatives, and do not express deny-lists as a not subschema with a pattern on untrusted input.

Evidence timeline and material changes

Published upstream
Nov 1, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Nov 1, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Nov 1, 2026

Sources and claim methodology

Upstream source description

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.

Quoted source text, attributed separately from HOL analysis.