undici: undici: Denial of Service via TLS renegotiation with mismatched certificate

A flaw was found in undici. A remote server can cause a Denial of Service DoS by initiating a Transport Layer Security TLS renegotiation and presenting a certificate with a mismatched hostname. Because the client application fails to properly handle the resulting verification error, an uncaught...

undici: undici: Denial of Service via TLS renegotiation with mismatched certificate

A flaw was found in undici. A remote server can cause a Denial of Service DoS by initiating a Transport Layer Security TLS renegotiation and presenting a certificate with a mismatched hostname. Because the client application fails to properly handle the resulting verification error, an uncaught...

cve-2021-3449

CVE-2021-3449 OpenSSL This issue was reported to OpenSSL on 17th March 2021 by Nokia. The fix was developed by Peter Kästle and Samuel Sapalski from Nokia. Mitigation The only known fix is to update libssl1.1. Even though some applications use hardened TLS configurations by default that disable T...

bash-tls-reneg-attack

bash-tls-reneg-attack A bash script that attempts to flood a server with TLS renegotiations by using the openssl client. See CVE-2011-1473 and CVE-2011-1473 for details. Usage: ./tls-reneg.sh some.hostname.here:port...

cve-2009-3555-test-server

What is this? This is a TLS server using a vendored fork of the Go TLS stack that has renegotation indication extension forcibly disabled, which will trigger CVE-2009-3555 mitigations in OpenSSL 3.0+. Note that it isn't truly vulnerable to CVE-2009-3555 because the Go TLS stack doesn't allow...

Undici Vulnerable To Denial Of Service Via TLS 1.2 Certificate-changing Renegotiation

Impact undici crashes the client process when a TLS 1.2 server renegotiates after the connection is established and presents a different, CA-trusted certificate whose hostname does not match the requested host. Node.js re-runs hostname verification on the renegotiated handshake and destroys the...

npm: undici vulnerable to Denial of Service via TLS 1.2 certificate-changing renegotiation

npm: undici vulnerable to Denial of Service via TLS 1.2 certificate-changing renegotiation vulnerability discovered by ? in WordPress npm undici versions = 4.2.1, 6.29.1...

undici vulnerable to Denial of Service via TLS 1.2 certificate-changing renegotiation

Impact undici crashes the client process when a TLS 1.2 server renegotiates after the connection is established and presents a different, CA-trusted certificate whose hostname does not match the requested host. Node.js re-runs hostname verification on the renegotiated handshake and destroys the...

EUVD-2026-102318

undici vulnerable to Denial of Service via TLS 1.2 certificate-changing renegotiation...

GHSA-QRXM-FQHP-JWVM undici vulnerable to Denial of Service via TLS 1.2 certificate-changing renegotiation

Impact undici crashes the client process when a TLS 1.2 server renegotiates after the connection is established and presents a different, CA-trusted certificate whose hostname does not match the requested host. Node.js re-runs hostname verification on the renegotiated handshake and destroys the...

undici: undici: Denial of Service via TLS renegotiation with mismatched certificate

A flaw was found in undici. A remote server can cause a Denial of Service DoS by initiating a Transport Layer Security TLS renegotiation and presenting a certificate with a mismatched hostname. Because the client application fails to properly handle the resulting verification error, an uncaught...

tls-vuln-poc

TLS Vulnerabilities PoC Secure Communications Systems 2026-27...

undici: undici: Denial of Service via TLS renegotiation with mismatched certificate

A flaw was found in undici. A remote server can cause a Denial of Service DoS by initiating a Transport Layer Security TLS renegotiation and presenting a certificate with a mismatched hostname. Because the client application fails to properly handle the resulting verification error, an uncaught...

undici: undici: Denial of Service via TLS renegotiation with mismatched certificate

A flaw was found in undici. A remote server can cause a Denial of Service DoS by initiating a Transport Layer Security TLS renegotiation and presenting a certificate with a mismatched hostname. Because the client application fails to properly handle the resulting verification error, an uncaught...

Astra Linux – vulnerability in freerdp3, freerdp2

FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to version 3.22.0, AUDIN format renegotiation freed the active format list; however, the capture thread continued to use audin-format, resulting in a use-after-free condition in audioformatcompatible. This vulnerability has be...

undici: undici: Denial of Service via TLS renegotiation with mismatched certificate

A flaw was found in undici. A remote server can cause a Denial of Service DoS by initiating a Transport Layer Security TLS renegotiation and presenting a certificate with a mismatched hostname. Because the client application fails to properly handle the resulting verification error, an uncaught...

SUSE CVE-2026-87018

undici is an HTTP client library for Node.js. In versions 4.2.1 through 6.29.0, 7.0.0 through 7.30.0, and 8.0.0 through 8.12.1, the client process crashes when a TLS 1.2 server renegotiates after the connection is established and presents a different, CA-trusted certificate whose hostname does no...

Linux Distros Unpatched Vulnerability : CVE-2026-87018

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available. - undici is an HTTP client library for Node.js. In versions 4.2.1 through 6.29.0, 7.0.0 through 7.30.0, and 8.0.0 through 8.12.1, the client process crashes when ...

UBUNTU-CVE-2026-87018

undici is an HTTP client library for Node.js. In versions 4.2.1 through 6.29.0, 7.0.0 through 7.30.0, and 8.0.0 through 8.12.1, the client process crashes when a TLS 1.2 server renegotiates after the connection is established and presents a different, CA-trusted certificate whose hostname does no...

CVE-2026-87018

A flaw was found in undici. A remote server can cause a Denial of Service DoS by initiating a Transport Layer Security TLS renegotiation and presenting a certificate with a mismatched hostname. Because the client application fails to properly handle the resulting verification error, an uncaught...