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CVE-2026-9678— undici vulnerable to cross-user information disclosure via shared cache whitespace bypass

Quick assessment

Affected
undici undici
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Node.js undici是Node.js基金会开源的一个HTTP/1.1客户端。 Node.js undici 7.28.0之前版本和8.5.0之前版本存在信息泄露漏洞，该漏洞源于缓存拦截器对Cache-Control标头中带空格的限定字段名处理不当，可能导致共享缓存模式下认证用户数据泄露给后续调用者。

CVSS 5.9 · Medium EPSS 0.42% · P35

Affected Version Matrix 4

VendorProduct Version RangeStatus
undici undici 7.0.0< 7.28.0 affected
7.28.0 unaffected
8.0.0< 8.5.0 affected
8.5.0 unaffected
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I. Basic Information for CVE-2026-9678

Vulnerability Information
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Vulnerability Title
undici vulnerable to cross-user information disclosure via shared cache whitespace bypass
Source: CVE Program / CVE List V5
Vulnerability Description
Impact: Undici's cache interceptor incorrectly classifies some responses as cacheable when the upstream Cache-Control header uses whitespace-padded qualified private or no-cache field names such as private=" authorization" or no-cache="\tauthorization". The parser preserves the surrounding whitespace, so later comparisons against the literal authorization field name fail and the response is stored. In shared-cache mode, this allows a response containing one user's authenticated data to be served from cache to a subsequent caller, including an unauthenticated caller, when both requests resolve to the same cache key. Affected applications are those that explicitly enable the cache interceptor (interceptors.cache()) in shared mode, forward Authorization headers upstream, and receive cacheable responses with non-canonical qualified private or no-cache directives. Patches: Upgrade to undici v7.28.0 or v8.5.0. Workarounds: If upgrade is not immediately possible, disable shared-cache mode for traffic that includes Authorization headers, avoid caching responses to authenticated requests, or add Vary: Authorization upstream.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
通过缓存导致的信息暴露
Source: CVE Program / CVE List V5
Vulnerability Title
Node.js undici 信息泄露漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Node.js undici是Node.js基金会开源的一个HTTP/1.1客户端。 Node.js undici 7.28.0之前版本和8.5.0之前版本存在信息泄露漏洞，该漏洞源于缓存拦截器对Cache-Control标头中带空格的限定字段名处理不当，可能导致共享缓存模式下认证用户数据泄露给后续调用者。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
undici undici 7.0.0 ~ 7.28.0 -

II. Public POCs for CVE-2026-9678

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III. Intelligence Information for CVE-2026-9678

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Vendor Advisories for CVE-2026-9678 (1)

Same Patch Batch · undici · 2026-06-17 · 8 CVEs total

CVE-2026-9675 7.5 HIGH undici WebSocket client vulnerable to denial of service via cumulative fragment bypass
CVE-2026-12151 7.5 HIGH undici WebSocket client vulnerable to denial of service via fragment count bypass
CVE-2026-6734 7.5 HIGH undici vulnerable to cross-origin request routing via SOCKS5 proxy pool reuse
CVE-2026-9697 7.4 HIGH undici vulnerable to TLS certificate validation bypass via dropped requestTls in SOCKS5 Pr
CVE-2026-9679 5.9 MEDIUM undici vulnerable to HTTP header injection via Set-Cookie percent-decoding
CVE-2026-6733 3.7 LOW undici vulnerable to HTTP response queue poisoning via keep-alive socket reuse
CVE-2026-11525 3.7 LOW undici vulnerable to Set-Cookie SameSite attribute downgrade via permissive substring matc

IV. Related Vulnerabilities

Same product: undici
Same vendor: undici
Same weakness: CWE-524

V. Comments for CVE-2026-9678

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