Request suppression via unsafe-method response caching
Published Sep 4, 2026 · Updated Sep 4, 2026
Improper response caching in Undici 7.0.0 through 7.29.0 and 8.0.0 through 8.10.1 allows remote attackers to suppress unsafe requests. The cache interceptor's skip-list excludes configured safe methods rather than unsafe methods, while canCacheResponse stores unsafe-method responses without checking the method. A remote origin can return cacheable headers once, causing later POST, PUT, PATCH, or DELETE requests to be replayed from cache instead of reaching that origin under the default configuration.
Summary
What happened
Improper response caching in Undici 7.0.0 through 7.29.0 and 8.0.0 through 8.10.1 allows remote attackers to suppress unsafe requests. The cache interceptor's skip-list excludes configured safe methods rather than unsafe methods, while canCacheResponse stores unsafe-method responses without checking the method. A remote origin can return cacheable headers once, causing later POST, PUT, PATCH, or DELETE requests to be replayed from cache instead of reaching that origin under the default configuration.
The record
- CVE
- CVE-2026-85008
- Published
- Sep 4, 2026
- Updated
- Sep 4, 2026
- Vendor
- Node.js
- Product
- Undici
- Classifications
- CWE-345
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Sep 4, 2026CVE publishedPublication date reported by the CVE source.
- Sep 4, 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?
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- Affected versionversion=7.0.0 <7.29.1
- Affected versionversion=8.0.0 <8.10.2
What conditions does exploitation require?
What is affected?
Published CVSS scores
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Attacks
What attackers are doing with it
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Technologies
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Your stack
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