Ash.Type.CiString validates length and match constraints before case folding, allowing constraint bypass (CVE-2026-82736) | HOL Guard CVE

Unknown severity · Source severity not reportedCVE-2026-82736

Ash.Type.CiString validates length and match constraints before case folding, allowing constraint bypass

Answer in brief

CVE-2026-82736 records a Unknown severity vulnerability in Ash.Type.CiString validates length and match constraints before case folding, allowing constraint bypass. The current sources do not mark it as known exploited. The current feed maps ash-project/ash (generic), ash-project/ash (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 Sep 1, 2026Updated Sep 1, 2026Source checked Sep 1, 2026First seen by HOL Sep 1, 2026Material review Sep 1, 2026

Upstream Advisory

Key facts

Risk: Unknown severitySource severity not reported
Exploitation: Not marked as known exploited
Affected software: 2 mapped packages or products
Fix availability: Available

Why this deserves its current priority

A CVSS score is not reported in the current record. 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 ash-project/ash (generic), ash-project/ash (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
ash-project/ashgeneric	>=1.29.0-rc0 <3.32.2	3.32.2
ash-project/ashgeneric	>=f6f5d194bfc7802bd32e48bf2eabd2d97a0109a4 <d8320b0127c8ef453679d70e5dd23a9506951d21	d8320b0127c8ef453679d70e5dd23a9506951d21

Recommended response

Check inventory. Check lockfiles and deployed manifests for ash-project/ash, ash-project/ash.
Review the reported fix. Update ash-project/ash to 3.32.2; ash-project/ash to d8320b0127c8ef453679d70e5dd23a9506951d21 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

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

Sources and claim methodology

Upstream source description

Incorrect Behavior Order: Validate Before Canonicalize vulnerability in ash-project ash lets an attacker store a case-insensitive string value that violates its length or match constraints. Ash.Type.CiString.apply_constraints/2 (lib/ash/type/ci_string.ex) validated the max_length, min_length, and match constraints against the value as submitted, while the type case-folds the string (per its casing) for storage and comparison. Because validation ran before folding, an attacker can submit a value whose folded form breaks a constraint but whose original form passes: for example, against a match pattern requiring uppercase, an uppercase value that is stored lowercased persists a value the pattern rejects. The fix case-folds the value at the start of apply_constraints/2, so the constraints are checked against the form that is actually stored. This issue affects ash: from 1.29.0-rc0 before 3.32.2.

Quoted source text, attributed separately from HOL analysis.