Cross-user disclosure and crash via private directives
Published Jul 29, 2026 · Updated Jul 29, 2026
Information disclosure and DoS in Undici 7.0.0 through 7.28.0 and 8.0.0 through 8.8.0 allow remote attackers to expose data or crash processes. The cache parser represents empty qualified private directives as arrays that bypass a boolean-only shared-cache guard, while mixed forms call concat on a boolean and throw. Exploitation requires the cache interceptor in shared mode, a crafted upstream Cache-Control response, and a later request with the same cache key; process termination requires an unhandled rejection.
Summary
What happened
Information disclosure and DoS in Undici 7.0.0 through 7.28.0 and 8.0.0 through 8.8.0 allow remote attackers to expose data or crash processes. The cache parser represents empty qualified private directives as arrays that bypass a boolean-only shared-cache guard, while mixed forms call concat on a boolean and throw. Exploitation requires the cache interceptor in shared mode, a crafted upstream Cache-Control response, and a later request with the same cache key; process termination requires an unhandled rejection.
The record
- CVE
- CVE-2026-13697
- Published
- Jul 29, 2026
- Updated
- Jul 29, 2026
- Vendor
- Node.js
- Product
- Undici
- Classifications
- CWE-248, CWE-200, CWE-525
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Jul 29, 2026CVE publishedPublication date reported by the CVE source.
- Jul 29, 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=7.0.0 <7.29.0
- Affected versionversion=8.0.0 <8.9.0
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
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Technologies
Your stack
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Your stack
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