Cross-user information disclosure via Cache-Control whitespace
Published Jul 29, 2026 · Updated Jul 29, 2026
Information disclosure in Undici 7.0.0 through 7.28.0 and 8.0.0 through 8.8.0 allows remote attackers to read cached user data. The cache interceptor parser drops qualified no-cache or private directives or retains literal quote characters when optional whitespace surrounds the equals sign, causing shared-cache decisions to store protected responses. Exposure requires shared-cache mode, forwarded Authorization headers, a matching cache key, and a cacheable response with a whitespace-padded qualified directive.
Summary
What happened
Information disclosure in Undici 7.0.0 through 7.28.0 and 8.0.0 through 8.8.0 allows remote attackers to read cached user data. The cache interceptor parser drops qualified no-cache or private directives or retains literal quote characters when optional whitespace surrounds the equals sign, causing shared-cache decisions to store protected responses. Exposure requires shared-cache mode, forwarded Authorization headers, a matching cache key, and a cacheable response with a whitespace-padded qualified directive.
The record
- CVE
- CVE-2026-14643
- Published
- Jul 29, 2026
- Updated
- Jul 29, 2026
- Vendor
- Node.js
- Product
- Undici
- Classifications
- CWE-436, CWE-524, T1190
- 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?
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
No public exploit references are available in this record.
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Technologies
Your stack
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Your stack
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