CVE-2026-44452 h2o is vulnerable to heap overrun

h2o is an HTTP server with support for HTTP/1.x, HTTP/2 and HTTP/3. Prior to commit 8dc37cb, when h2o receives a ClientHello message over TLS or QUIC and it contains a zero-length SNI extension, the h2o server runs over the zero-length hostname while trying to copy the hostname, assuming that it ...

CVE-2026-44452

h2o is an HTTP server with support for HTTP/1.x, HTTP/2 and HTTP/3. Prior to commit 8dc37cb, when h2o receives a ClientHello message over TLS or QUIC and it contains a zero-length SNI extension, the h2o server runs over the zero-length hostname while trying to copy the hostname, assuming that it ...

CVE-2026-44452

h2o is an HTTP server with support for HTTP/1.x, HTTP/2 and HTTP/3. Prior to commit 8dc37cb, when h2o receives a ClientHello message over TLS or QUIC and it contains a zero-length SNI extension, the h2o server runs over the zero-length hostname while trying to copy the hostname, assuming that it ...

CVE-2026-44452

CVE-2026-44452 affects the h2o HTTP server (supports HTTP/1.x, 2, 3). Affected behavior occurs when a TLS/QUIC ClientHello contains a zero-length SNI extension; h2o can attempt to copy the hostname assuming NULL-termination, causing a heap/segmentation fault that may enable a denial-of-service. T...

Golang 1.25.x < 1.25.12 / 1.26.x < 1.26.5 Multiple Vulnerabilities

The version of Golang running on the remote host is 1.25.x prior to 1.25.12 or 1.26.x prior to 1.26.5. It is, therefore, affected by multiple vulnerabilities: - On Unix systems, opening a file in an os.Root improperly follows symlinks to locations outside of the Root when the final path component...

openSUSE 16 Security Update : go1.26 (openSUSE-SU-2026:21341-1)

The remote openSUSE 16 host has packages installed that are affected by multiple vulnerabilities as referenced in the openSUSE-SU-2026:21341-1 advisory. This update for go1.26 fixes the following issues - Update to version go1.26.5 bsc1255111. - CVE-2026-39822: os: Root escape via symlink plus...

JLSEC-2026-708

Heap Overflow in TLS 1.3 ECH parsing. An integer underflow existed in ECH extension parsing logic when calculating a buffer length, which resulted in writing beyond the bounds of an allocated buffer. Note that in wolfSSL, ECH is off by default, and the ECH standard is still evolving...

JLSEC-2026-711 Stack Buffer Overflow in `wc_HpkeLabeledExtract` via Oversized ECH Config

Stack Buffer Overflow in wcHpkeLabeledExtract via Oversized ECH Config. A vulnerability existed in wolfSSL 5.8.4 ECH Encrypted Client Hello support, where a maliciously crafted ECH config could cause a stack buffer overflow on the client side, leading to potential remote execution and client...

BIT-GOLANG-2026-42505 Invoking Encrypted Client Hello privacy leak in crypto/tls

Handshakes which used Encrypted Client Hello could be de-anonymized by a passive network observer due to a disclosure of pre-shared key identities in the unencrypted client hello...

SUSE-SU-2026:22656-1 Security update for go1.26

This update for go1.26 fixes the following issues - Update to version go1.26.5 bsc1255111. - CVE-2026-39822: os: Root escape via symlink plus trailing slash bsc1271014. - CVE-2026-42505: crypto/tls: omit PSK in ECH outer client hello bsc1271015...

PT-2026-58910

Handshakes which used Encrypted Client Hello could be de-anonymized by a passive network observer due to a disclosure of pre-shared key identities in the unencrypted client hello...

SUSE-SU-2026:22643-1 Security update for go1.25

This update for go1.25 fixes the following issues - Update to version go1.25.12 bsc1244485. - CVE-2026-25679: net/url: reject IPv6 literal not at start of host bsc1259264. - CVE-2026-27139: os: FileInfo can escape from a Root bsc1259268. - CVE-2026-27142: html/template: URLs in meta content...

crypto/tls: golang: Go crypto/tls: Information disclosure in Encrypted Client Hello

A flaw was found in the crypto/tls package in Go. Handshakes utilizing Encrypted Client Hello ECH could lead to de-anonymization by a passive network observer. This is due to the disclosure of pre-shared key identities within the unencrypted client hello, allowing an attacker to potentially link...

OPENSUSE-SU-2026:21321-1 Security update for go1.26-openssl

This update for go1.26-openssl fixes the following issues - Update to version go1.26.5 bsc1255111. - CVE-2026-39822: os: Root escape via symlink plus trailing slash bsc1271014. - CVE-2026-42505: crypto/tls: omit PSK in ECH outer client hello bsc1271015...

SUSE SLED15 / SLES15 Security Update : go1.26 (SUSE-SU-2026:2818-1)

The remote SUSE Linux SLED15 / SLEDSAP15 / SLES15 / SLESSAP15 host has packages installed that are affected by multiple vulnerabilities as referenced in the SUSE-SU-2026:2818-1 advisory. This update for go1.26 fixes the following issues - Update to version go1.26.5 bsc1255111 - CVE-2026-39822: os...

crypto/tls: golang: Go crypto/tls: Information disclosure in Encrypted Client Hello

A flaw was found in the crypto/tls package in Go. Handshakes utilizing Encrypted Client Hello ECH could lead to de-anonymization by a passive network observer. This is due to the disclosure of pre-shared key identities within the unencrypted client hello, allowing an attacker to potentially link...

crypto/tls: golang: Go crypto/tls: Information disclosure in Encrypted Client Hello

A flaw was found in the crypto/tls package in Go. Handshakes utilizing Encrypted Client Hello ECH could lead to de-anonymization by a passive network observer. This is due to the disclosure of pre-shared key identities within the unencrypted client hello, allowing an attacker to potentially link...

Security update for go1.26

This update for go1.26 fixes the following issues Update to version go1.26.5 bsc1255111 CVE-2026-39822: os: Root escape via symlink plus trailing slash bsc1271014. CVE-2026-42505: crypto/tls: omit PSK in ECH outer client hello bsc1271015. Patch Instructions: To install this SUSE update use the SU...

CVE-2026-11404

Cesanta Mongoose before 7.22 contains an out-of-bounds read in the built-in TLS server function mgtlsserverrecvhello, which uses an attacker-controlled sessionidlen byte from a TLS ClientHello as a buffer index without validating it against the length of received data. A remote, unauthenticated...

netty-handler: Netty: Denial of Service due to eager buffer allocation in TLS handshake

A flaw was found in Netty, a network application framework. A remote attacker can exploit this vulnerability by sending a crafted TLS Transport Layer Security ClientHello message. This can lead to an eager allocation of a large memory buffer, causing a Denial of Service DoS due to excessive memor...