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CVE-2026-6733— undici vulnerable to HTTP response queue poisoning via keep-alive socket reuse

CVSS 3.7 · Low

Affected Version Matrix 6

VendorProductVersion RangeStatus
undiciundici< 6.26.0affected
6.26.0unaffected
7.0.0< 7.28.0affected
7.28.0unaffected
8.0.0< 8.5.0affected
8.5.0unaffected
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I. Basic Information for CVE-2026-6733

Vulnerability Information
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Vulnerability Title
undici vulnerable to HTTP response queue poisoning via keep-alive socket reuse
Source: NVD (National Vulnerability Database)
Vulnerability Description
Impact: Undici's HTTP/1.1 client is vulnerable to response queue poisoning on reused keep-alive sockets. An attacker-controlled upstream server can inject an unsolicited HTTP/1.1 response onto an idle socket after a request completes. When the client dispatches the next request on that socket, it associates the injected response with the new request, causing responses to be delivered to the wrong requests. This requires an attacker-controlled or compromised upstream HTTP/1.1 server and keep-alive connection reuse. Patches: Upgrade to undici v6.26.0, v7.28.0 or v8.5.0. Workarounds: Disable keep-alive connection reuse by setting keepAliveTimeout: 0 on the Client or Pool.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N
Source: NVD (National Vulnerability Database)
Vulnerability Type
检查时间与使用时间(TOCTOU)的竞争条件
Source: NVD (National Vulnerability Database)

Affected Products

VendorProductAffected VersionsCPESubscribe
undiciundici 0 ~ 6.26.0 -

II. Public POCs for CVE-2026-6733

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III. Intelligence Information for CVE-2026-6733

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Vendor Advisories for CVE-2026-6733 (1)

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

CVE-2026-96757.5 HIGHundici WebSocket client vulnerable to denial of service via cumulative fragment bypass
CVE-2026-121517.5 HIGHundici WebSocket client vulnerable to denial of service via fragment count bypass
CVE-2026-67347.5 HIGHundici vulnerable to cross-origin request routing via SOCKS5 proxy pool reuse
CVE-2026-96977.4 HIGHundici vulnerable to TLS certificate validation bypass via dropped requestTls in SOCKS5 Pr
CVE-2026-96795.9 MEDIUMundici vulnerable to HTTP header injection via Set-Cookie percent-decoding
CVE-2026-96785.9 MEDIUMundici vulnerable to cross-user information disclosure via shared cache whitespace bypass
CVE-2026-115253.7 LOWundici vulnerable to Set-Cookie SameSite attribute downgrade via permissive substring matc

IV. Related Vulnerabilities

Same product: undici
Same vendor: undici
Same weakness: CWE-367

V. Comments for CVE-2026-6733

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