CVE-2026-12151

The CVE affects the undici WebSocket client (and WebSocketStream API) where maxPayloadSize is enforced per-frame but there is no limit on the number of fragments in a message. A malicious server can send many small or empty continuation frames, each passing validation, causing unbounded memory gr...

CVE-2026-13697

Summary of a known vulnerability in undici (CVE-2026-13697) : The cache interceptor in undici mishandles degenerate private directives in Cache-Control, enabling two issues in shared mode. First, a response with malformed qualified private directives (for example, private="" or private=",") can b...

CVE-2026-1525

CVE-2026-1525 is an Undici HTTP client issue where passing duplicate Content-Length headers (especially with mixed case variants like Content-Length and content-length) can produce malformed HTTP/1.1 requests and enable HTTP Request Smuggling in misconfigured environments. Public advisories indic...

CVE-2026-18540

CVE-2026-18540 affects undici (Node.js HTTP client library). The retry interceptor can append the body of a ranged retry response to bytes already delivered from an earlier partial response, presenting the original status and headers. This causes the response body to exceed the observed Content-L...

CVE-2026-1526

undici WebSocket PerMessageDeflate.decompress() can accumulate decompressed data without a size limit, enabling a decompression bomb that may exhaust Node.js memory and crash or render the process unresponsive. The description specifies a denial-of-service via memory exhaustion. No remediation or...

CVE-2026-11525

The issue affects undici’s cookie parsing in Set-Cookie headers. The root cause is a permissive substring match for the SameSite attribute during parsing, accepting any value containing Strict, Lax, or None instead of enforcing a case-insensitive exact match per RFC 6265. This can cause downstrea...

CVE-2026-15157

undici is vulnerable to CRLF injection via a duck-typed blob-like request body’s type property when used as the Content-Type header on HTTP/1.1 dispatchers. Affected ranges: undici before 6.28.0; 7.0.0–before 7.29.0; and 8.0.0–before 8.9.0. An attacker supplying a hand-rolled blob-like body deriv...

CVE-2026-16729

undici vulnerable to cookie attribute injection via unsanitized domain and unparsed setCookie fields. In undici

CVE-2026-16728

Undici contains a defect in its retry interceptor: after a retry or resume of a partial response, it can assemble a body whose length differs from the Content-Length observed by the application. In affected ranges (before 6.28.0, 7.0.0–7.28.x, and 8.0.0–7.29.0 to 8.8.x), a faulty upstream may ret...

CVE-2026-2229

The CVE affects the undici WebSocket client. It arises from improper validation of the server_max_window_bits parameter in the permessage-deflate extension: isValidClientWindowBits() only checks ASCII digits and not the 8–15 range, and createInflateRaw() is not wrapped in a try-catch. A malicious...

CVE-2026-14643

undici contains a cache-interceptor vulnerability where optional whitespace around the = in qualified no-cache or private Cache-Control directives is not normalized. In affected releases (7.0.0–7.28.x and 8.0.0–8.8.x), the parser may drop the directive or store a quoted field name, causing a cach...

CVE-2026-1528

CVE-2026-1528 : A flaw in undici’s WebSocket handling allows a server to reply with a 64‑bit length frame that specifies an extremely large length. The ByteParser overflows internal math, enters an invalid state, and throws a fatal TypeError that terminates the process. Affected: undici (Node.js ...

CVE-2026-6733

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 issues the next request on that socket, the injected r...

CVE-2026-9679

undici vulnerability CVE-2026-9679 affects the cookie parsing paths (parseSetCookie, parseCookie, getSetCookies). The cookie parser percent-decodes values (via qsUnescape), turning sequences like %0D%0A, %00, %3B, and %3D into literal bytes. RFC 6265 §5.4 does not require decoding and browsers do...

CVE-2026-9678

Undici (node) vulnerability CVE-2026-9678: in shared-cache mode, the cache interceptor may misclassify responses as cacheable when Cache-Control uses whitespace-padded private/no-cache directives (e.g., private=" authorization" or no-cache="\tauthorization"). The whitespace is preserved by the pa...

CVE-2026-22036

Undici (HTTP/1.1 client for Node.js) contains a vulnerability in its decompression chain handling. Before versions 7.18.0 and 6.23.0, the chain can have an unbounded number of links, and the default maxHeaderSize allows a malicious server to insert thousands of compression steps, causing high CPU...

CVE-2026-1527

Undici (Node.js HTTP client) is vulnerable to a CRLF injection via the upgrade option in client.request() when user-controlled input is passed to the upgrade value. The root cause is that the upgrade value is written directly to the socket without validating header characters, allowing an attacke...

CVE-2026-19534

CVE-2026-19534 affects undici , the Node.js HTTP client library. During the WebSocket opening handshake, if a server's 101 response includes a Sec-WebSocket-Protocol header that the client never requested, undici dereferences a null value while checking it against the requested subprotocol list, ...

CVE-2026-85014

CVE-2026-85014 affects undici's experimental WebSocketStream client in Node.js. When a remote peer closes the TCP connection without a proper WebSocket close handshake, the internal socket-close handler calls abort on the locked writable stream and discards the returned promise. Per the WHATWG St...

CVE-2026-85008

undici , a Node.js HTTP client library, contains an integrity flaw in its cache interceptor . The skip-caching logic subtracts configured methods from the set of safe methods, so unsafe methods such as POST , PUT , or DELETE are never excluded and fall through to the cache-read path. The response...

CVE-2026-84933

undici , the Node.js HTTP client library, has a flaw in its cache interceptor that fails to handle the Set-Cookie response header in its cache path—neither refusing to store nor stripping it. In shared cache mode (the default), a cacheable response carrying a Set-Cookie header is stored and re-se...