Unauthenticated error disclosure via fail-open handler
Published Sep 1, 2026 · Updated Sep 1, 2026
Information disclosure in Ash Framework AshTypescript 0.8.0 through 0.17.3 allows remote attackers to receive unredacted RPC errors. The apply_error_handler/3 rescue clause returns the original pre-handler error map when a pattern-matching handler raises, exposing secrets in vars. Exploitation requires an HTTP-exposed RPC endpoint, a custom error_handler, and a crafted request that produces an unmatched error shape.
Summary
What happened
Information disclosure in Ash Framework AshTypescript 0.8.0 through 0.17.3 allows remote attackers to receive unredacted RPC errors. The apply_error_handler/3 rescue clause returns the original pre-handler error map when a pattern-matching handler raises, exposing secrets in vars. Exploitation requires an HTTP-exposed RPC endpoint, a custom error_handler, and a crafted request that produces an unmatched error shape.
The record
- CVE
- CVE-2026-77950
- Published
- Sep 1, 2026
- Updated
- Sep 1, 2026
- Vendor
- Ash Framework
- Product
- AshTypescript
- Classifications
- CWE-209, CAPEC-54
- Attack vector
- network
- 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=0.8.0 <0.18.0
- Affected versionversion=cb01cc8749e5a2a17fb45aedbe75df30a9f1126e <59d8e985a98cf2e01794dbe5b919b897a95311f4
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 advisory proof of conceptproof of concept · demonstrated
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Technologies
Your stack
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Your stack
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