Service interruption via ungated over-length regex evaluation
Published Sep 1, 2026 · Updated Sep 1, 2026
Resource exhaustion in Ash 0.10.0 through 3.32.1 allows attackers to interrupt services by submitting over-length matched strings. Ash.Type.String.apply_constraints/2 applies the :match regex even after min_length or max_length rejects the same value, leaving regex input unbounded. Exploitation requires an application to combine a match regex with a length constraint and pass attacker-controlled input; a backtracking pattern can monopolize CPU.
Summary
What happened
Resource exhaustion in Ash 0.10.0 through 3.32.1 allows attackers to interrupt services by submitting over-length matched strings. Ash.Type.String.apply_constraints/2 applies the :match regex even after min_length or max_length rejects the same value, leaving regex input unbounded. Exploitation requires an application to combine a match regex with a length constraint and pass attacker-controlled input; a backtracking pattern can monopolize CPU.
The record
- CVE
- CVE-2026-82735
- Published
- Sep 1, 2026
- Updated
- Sep 1, 2026
- Vendor
- Ash Framework
- Product
- Ash
- Classifications
- CWE-400, CAPEC-492, T1499.004
- Attack vector
- local
- Privileges
- unauthenticated
Timeline
How it unfolded
- Sep 1, 2026CVE publishedPublication date reported by the CVE source.
- Sep 1, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=0.10.0 <3.32.2
- Affected versionversion=05848d5f4affe60fddd812222a18ada080c0813b <14928412a1a94a69c47df8e98920d3a2b09cdec4
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
- Upstream regular-expression denial-of-service proof of conceptproof of concept · unverified
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Technologies
Your stack
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Your stack
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