Node.js Module Undici 6.17.x < 6.27.0 / 7.x < 7.28.0 / 8.x < 8.5.0 DoS (CVE-2026-12151)

The nodejs module Undici detected on the host is version 6.17.x prior to 6.27.0, 7.x prior to 7.28.0, or 8.x prior to 8.5.0. It is, therefore, affected by a denial of service vulnerability: - The undici WebSocket client enforces maxPayloadSize on the cumulative byte count of fragments in a messag...

Linux Distros Unpatched Vulnerability : CVE-2026-9679

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available. - Impact: undici's cookie parser in parseSetCookie percent-decodes cookie values via qsUnescape, turning encoded sequences like %0D%0A, %00, %3B, and %3D into the...

Linux Distros Unpatched Vulnerability : CVE-2026-9697

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available. - Impact: undici's ProxyAgent silently drops the requestTls option when configured with a SOCKS5 proxy URI socks5:// or socks://. The target HTTPS connection...

Linux Distros Unpatched Vulnerability : CVE-2026-11525

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available. - Impact: When undici parses a Set-Cookie header, it accepts any SameSite attribute value that contains Strict, Lax, or None as a substring, rather than the...

EUVD-2026-37758

undici vulnerable to Set-Cookie SameSite attribute downgrade via permissive substring matching...

EUVD-2026-37764

undici vulnerable to HTTP header injection via Set-Cookie percent-decoding...

undici vulnerable to HTTP header injection via Set-Cookie percent-decoding

Impact undici's cookie parser in parseSetCookie percent-decodes cookie values via qsUnescape, turning encoded sequences like %0D%0A, %00, %3B, and %3D into their literal byte equivalents. RFC 6265 §5.4 does not specify any decoding and browsers do not decode either. Applications that parse a...

NPM: undici vulnerable to HTTP header injection via Set-Cookie percent-decoding

NPM: undici vulnerable to HTTP header injection via Set-Cookie percent-decoding vulnerability discovered by ? in WordPress Npm undici versions 6.27.0...

NPM: undici vulnerable to cross-origin request routing via SOCKS5 proxy pool reuse

NPM: undici vulnerable to cross-origin request routing via SOCKS5 proxy pool reuse vulnerability discovered by ? in WordPress Npm undici versions = 7.23.0, 7.28.0...

GHSA-35P6-XMWP-9G52 undici vulnerable to HTTP response queue poisoning via keep-alive socket reuse

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...

SUSE CVE-2026-11525

Impact: When undici parses a Set-Cookie header, it accepts any SameSite attribute value that contains Strict, Lax, or None as a substring, rather than the case-insensitive exact match specified by RFC 6265. Non-spec values are silently mapped to one of the three standard tokens. For example,...

undici vulnerable to TLS certificate validation bypass via dropped requestTls in SOCKS5 ProxyAgent

Impact undici's ProxyAgent silently drops the requestTls option when configured with a SOCKS5 proxy URI socks5:// or socks://. The target HTTPS connection through the SOCKS5 tunnel falls back to Node's default trust store, ignoring user-configured ca, cert, key, rejectUnauthorized, and servername...

NPM: undici vulnerable to TLS certificate validation bypass via dropped requestTls in SOCKS5 ProxyAgent

NPM: undici vulnerable to TLS certificate validation bypass via dropped requestTls in SOCKS5 ProxyAgent vulnerability discovered by ? in WordPress Npm undici versions = 7.23.0, 7.28.0...

GHSA-PR7R-676H-XCF6 undici vulnerable to cross-user information disclosure via shared cache whitespace bypass

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...

CVE-2026-6734

A flaw was found in undici. When using Socks5ProxyAgent, undici incorrectly reuses a single connection pool across different origins. This can lead to cross-origin request routing, where sensitive credentials and data intended for one destination are sent to another. Consequently, responses from...

CVE-2026-11525

A flaw was found in undici. When undici processes Set-Cookie headers, it incorrectly interprets the SameSite attribute, accepting partial matches instead of exact ones. This allows a malicious server to downgrade a cookie's SameSite policy to a less secure setting, potentially leading to unintend...

Time-of-check Time-of-use (TOCTOU) Race Condition

Overview org.webjars.npm:undici is an An HTTP/1.1 client, written from scratch for Node.js Affected versions of this package are vulnerable to Time-of-check Time-of-use TOCTOU Race Condition in the HTTP/1.1 client when an attacker-controlled upstream server injects an unsolicited response onto an...

Use of Cache Containing Sensitive Information

Overview undici is an An HTTP/1.1 client, written from scratch for Node.js Affected versions of this package are vulnerable to Use of Cache Containing Sensitive Information in the cache interceptor. An attacker can obtain another user's authenticated response data by exploiting whitespace-padded...

CRLF Injection

Overview undici is an An HTTP/1.1 client, written from scratch for Node.js Affected versions of this package are vulnerable to CRLF Injection in the parseSetCookie. An attacker can inject arbitrary HTTP headers by supplying specially crafted percent-encoded values in the Set-Cookie header, which...

Improper Certificate Validation

Overview undici is an An HTTP/1.1 client, written from scratch for Node.js Affected versions of this package are vulnerable to Improper Certificate Validation in the ProxyAgent when configured with a SOCKS5 proxy URI, which causes the requestTls option to be silently dropped. An attacker can...