undici vulnerabilities
CVEs whose affected-version data names the undici package (npm). Each record lists the affected and patched versions; check a specific version with the dependency checker or POST /api/sbom.
24 CVEsRSS
CVE-2026-84890Medium· 5.9undici's decompress interceptor decompresses response bodies according to the untrusted Content-Encoding header
undici's decompress interceptor decompresses response bodies according to the untrusted Content-Encoding header. While the number of content-encoding layers is capped, the total decompressed output size is unbounded and there is no confi…
CVE-2026-85152High· 7.4undici 8.10.0 omits the destination origin from the cache and request-deduplication keys when the cache or deduplicate interceptor is composed directly onto a Client or Pool
undici 8.10.0 omits the destination origin from the cache and request-deduplication keys when the cache or deduplicate interceptor is composed directly onto a Client or Pool. Because the internal cache key falls back to an empty origin s…
CVE-2026-85024Medium· 5.9undici bundles a WebSocket client whose permessage-deflate size-limit cleanup removes all listeners from the internal zlib inflate stream, including its error listener, while that stream can still emit
undici bundles a WebSocket client whose permessage-deflate size-limit cleanup removes all listeners from the internal zlib inflate stream, including its error listener, while that stream can still emit. When a remote peer sends a compres…
CVE-2026-85014Medium· 5.9undici's experimental WebSocketStream client crashes the whole Node.js process when a remote peer closes the TCP connection without a WebSocket close handshake
undici's experimental WebSocketStream client crashes the whole Node.js process when a remote peer closes the TCP connection without a WebSocket close handshake. On an unclean close the internal socket-close handler calls abort on the wri…
CVE-2026-85008Low· 3.7undici's cache interceptor documents that only safe HTTP methods are cached, but its logic to skip caching is built by subtracting the configured methods from the set of safe methods, so an unsafe method such as POST, PUT, or DELETE is n…
undici's cache interceptor documents that only safe HTTP methods are cached, but its logic to skip caching is built by subtracting the configured methods from the set of safe methods, so an unsafe method such as POST, PUT, or DELETE is n…
CVE-2026-84961High· 7.4undici's BalancedPool constructor passes its entire options object through an internal deep-clone that serializes and reparses the value as JSON
undici's BalancedPool constructor passes its entire options object through an internal deep-clone that serializes and reparses the value as JSON. Because JSON cannot represent functions, any function-valued TLS option, such as a caller-s…
CVE-2026-84947Low· 3.7⚖ disputedundici's dump interceptor reads and discards a response body up to a configurable maximum size
undici's dump interceptor reads and discards a response body up to a configurable maximum size. When a response declares a Content-Length that exceeds the maximum, the interceptor aborts cleanly, but when a response has no Content-Length…
CVE-2026-84933Medium· 6.5undici's cache interceptor does not handle the Set-Cookie response header anywhere in its cache path, so it neither refuses to store nor strips that header
undici's cache interceptor does not handle the Set-Cookie response header anywhere in its cache path, so it neither refuses to store nor strips that header. In shared cache mode, which is the default, an otherwise cacheable response that…
CVE-2026-19534High· 7.5undici's WebSocket client crashes the whole Node.js process during the opening handshake when a server responds with a subprotocol that the client never requested
undici's WebSocket client crashes the whole Node.js process during the opening handshake when a server responds with a subprotocol that the client never requested. A default WebSocket connection sends no subprotocol, but if the server's …
CVE-2026-18540Low· 3.7undici's retry interceptor can append the body of a ranged retry response to bytes already delivered from an earlier partial response while still presenting the original response's status and headers
undici's retry interceptor can append the body of a ranged retry response to bytes already delivered from an earlier partial response while still presenting the original response's status and headers. This happens when an upstream server…
CVE-2026-18149Medium· 5.9undici's retry handler can leave an already-exposed response body pending forever
undici's retry handler can leave an already-exposed response body pending forever. When a server returns a successful response that declares a Content-Length, sends only part of the body, and closes the connection, the retry handler retr…
CVE-2026-16729Medium· 4.8undici vulnerable to cookie attribute injection via unsanitized domain and unparsed setCookie fields
undici vulnerable to cookie attribute injection via unsanitized domain and unparsed setCookie fields
CVE-2026-14643Medium· 5.9undici vulnerable to cross-user information disclosure via whitespace around equals in Cache-Control directives
undici vulnerable to cross-user information disclosure via whitespace around equals in Cache-Control directives
CVE-2026-15157Medium· 4.2undici vulnerable to CRLF Injection via blob-like body 'type' property
undici vulnerable to CRLF Injection via blob-like body 'type' property
CVE-2026-13697High· 7.4undici vulnerable to cross-user information disclosure and parse-time crash via degenerate private cache directives
undici vulnerable to cross-user information disclosure and parse-time crash via degenerate private cache directives
CVE-2026-16728Medium· 4.8undici vulnerable to downstream response desynchronization via retry interceptor
undici vulnerable to downstream response desynchronization via retry interceptor
CVE-2026-6733Low· 3.7undici vulnerable to HTTP response queue poisoning via keep-alive socket reuse
undici vulnerable to HTTP response queue poisoning via keep-alive socket reuse
CVE-2026-9679Medium· 5.9undici vulnerable to HTTP header injection via Set-Cookie percent-decoding
undici vulnerable to HTTP header injection via Set-Cookie percent-decoding
CVE-2026-11525Low· 3.7undici vulnerable to Set-Cookie SameSite attribute downgrade via permissive substring matching
undici vulnerable to Set-Cookie SameSite attribute downgrade via permissive substring matching
CVE-2026-9675High· 7.5undici WebSocket client vulnerable to denial of service via cumulative fragment bypass
undici WebSocket client vulnerable to denial of service via cumulative fragment bypass
CVE-2026-9678Medium· 5.9undici vulnerable to cross-user information disclosure via shared cache whitespace bypass
undici vulnerable to cross-user information disclosure via shared cache whitespace bypass
CVE-2026-2229High· 7.5ImpactThe undici WebSocket client is vulnerable to a denial-of-service attack due to improper validation of the server_max_window_bits parameter in the permessage-deflate extension
ImpactThe undici WebSocket client is vulnerable to a denial-of-service attack due to improper validation of the server_max_window_bits parameter in the permessage-deflate extension. When a WebSocket client connects to a server, it automa…
CVE-2026-1528High· 7.5ImpactA server can reply with a WebSocket frame using the 64-bit length form and an extremely large length
ImpactA server can reply with a WebSocket frame using the 64-bit length form and an extremely large length. undici's ByteParser overflows internal math, ends up in an invalid state, and throws a fatal TypeError that terminates the proces…
CVE-2026-1526High· 7.5The undici WebSocket client is vulnerable to a denial-of-service attack via unbounded memory consumption during permessage-deflate decompression
The undici WebSocket client is vulnerable to a denial-of-service attack via unbounded memory consumption during permessage-deflate decompression. When a WebSocket connection negotiates the permessage-deflate extension, the client decompr…