CVE-2026-23397

In the Linux kernel, the following vulnerability has been resolved: nfnetlinkosf: validate individual option lengths in fingerprints nfnlosfaddcallback validates optnum bounds and string NUL-termination but does not check individual option length fields. A zero-length option causes nfosfmatchone ...

Picomatch 安全漏洞

Picomatch is a fast and accurate Glob-style pattern matching library written in JavaScript, developed by micromatch. Versions prior to Picomatch 4.0.4, 3.0.2, and 2.3.2 contained security vulnerabilities. These vulnerabilities stemmed from method injection in the POSIXREGEXSOURCE object, which...

Prototype Pollution

Overview Affected versions of this package are vulnerable to Prototype Pollution via the POSIXREGEXSOURCE object. An attacker can cause unintended files to be matched by injecting specially crafted POSIX bracket expressions that reference inherited method names, leading to incorrect glob matching...

Picomatch: Method Injection in POSIX Character Classes causes incorrect Glob Matching

Impact picomatch is vulnerable to a method injection vulnerability CWE-1321 affecting the POSIXREGEXSOURCE object. Because the object inherits from Object.prototype, specially crafted POSIX bracket expressions e.g., :constructor: can reference inherited method names. These methods are implicitly...

Prototype Pollution

Overview Affected versions of this package are vulnerable to Prototype Pollution via the POSIXREGEXSOURCE object. An attacker can cause unintended files to be matched by injecting specially crafted POSIX bracket expressions that reference inherited method names, leading to incorrect glob matching...

GHSA-3V7F-55P6-F55P Picomatch: Method Injection in POSIX Character Classes causes incorrect Glob Matching

Impact picomatch is vulnerable to a method injection vulnerability CWE-1321 affecting the POSIXREGEXSOURCE object. Because the object inherits from Object.prototype, specially crafted POSIX bracket expressions e.g., :constructor: can reference inherited method names. These methods are implicitly...

CVE-2026-33248 NATS has mTLS verify_and_map authentication bypass via incorrect Subject DN matching

NATS-Server is a High-Performance server for NATS.io, a cloud and edge native messaging system. Prior to versions 2.11.15 and 2.12.6, when using mTLS for client identity, with verifyandmap to derive a NATS identity from the client certificate's Subject DN, certain patterns of RDN would not be...

CVE-2026-33248

NATS-Server has an authentication bypass vulnerability in mTLS verify_and_map where certain RDN patterns in the client certificate Subject DN were not correctly enforced. A valid certificate from a trusted CA could bypass identity checks on versions prior to 2.11.15 and 2.12.6. The issue is consi...

CVE-2026-33248 NATS has mTLS verify_and_map authentication bypass via incorrect Subject DN matching

NATS-Server is a High-Performance server for NATS.io, a cloud and edge native messaging system. Prior to versions 2.11.15 and 2.12.6, when using mTLS for client identity, with verifyandmap to derive a NATS identity from the client certificate's Subject DN, certain patterns of RDN would not be...

Mattermost allows attackers to take over arbitrary user accounts via overly permissive substring matching flaw

Mattermost versions 11.4.x = 11.4.0, 11.3.x = 11.3.1, 11.2.x = 11.2.3, 10.11.x = 10.11.11 fail to properly validate user identity in the OpenID IsSameUser comparison logic, which allows an attacker to take over arbitrary user accounts via an overly permissive substring matching flaw in the user...

Incorrect Implementation of Authentication Algorithm

Overview github.com/mattermost/mattermost-server is an open source Slack-alternative in Golang and React. Affected versions of this package are vulnerable to Incorrect Implementation of Authentication Algorithm in the IsSameUser function. An attacker can gain unauthorized access to arbitrary user...

GHSA-FG35-5RF6-QG3G Mattermost allows attackers to take over arbitrary user accounts via overly permissive substring matching flaw

Mattermost versions 11.4.x = 11.4.0, 11.3.x = 11.3.1, 11.2.x = 11.2.3, 10.11.x = 10.11.11 fail to properly validate user identity in the OpenID IsSameUser comparison logic, which allows an attacker to take over arbitrary user accounts via an overly permissive substring matching flaw in the user...

CVE-2026-27656

Mattermost versions 11.4.x = 11.4.0, 11.3.x = 11.3.1, 11.2.x = 11.2.3, 10.11.x = 10.11.11 fail to properly validate user identity in the OpenID IsSameUser comparison logic, which allows an attacker to take over arbitrary user accounts via an overly permissive substring matching flaw in the user...

CVE-2026-27656

Mattermost versions 11.4.x = 11.4.0, 11.3.x = 11.3.1, 11.2.x = 11.2.3, 10.11.x = 10.11.11 fail to properly validate user identity in the OpenID IsSameUser comparison logic, which allows an attacker to take over arbitrary user accounts via an overly permissive substring matching flaw in the user...

CVE-2026-27656

Mattermost contains a vulnerability (CVE-2026-27656) where versions 11.4.x <= 11.4.0, 11.3.x <= 11.3.1, 11.2.x <= 11.2.3, and 10.11.x

CVE-2026-27656 Account Takeover via Substring Matching in OpenID Connect Authentication

Mattermost versions 11.4.x = 11.4.0, 11.3.x = 11.3.1, 11.2.x = 11.2.3, 10.11.x = 10.11.11 fail to properly validate user identity in the OpenID IsSameUser comparison logic, which allows an attacker to take over arbitrary user accounts via an overly permissive substring matching flaw in the user...

CVE-2026-27656 Account Takeover via Substring Matching in OpenID Connect Authentication

Mattermost versions 11.4.x = 11.4.0, 11.3.x = 11.3.1, 11.2.x = 11.2.3, 10.11.x = 10.11.11 fail to properly validate user identity in the OpenID IsSameUser comparison logic, which allows an attacker to take over arbitrary user accounts via an overly permissive substring matching flaw in the user...

PT-2026-28173

Name of the Vulnerable Software and Affected Versions Picomatch versions prior to 4.0.4 Picomatch versions prior to 3.0.2 Picomatch versions prior to 2.3.2 Description Picomatch, a JavaScript glob matcher, contains a flaw where specially crafted POSIX bracket expressions, such as :constructor:, c...

CVE-2026-33769

Astro is a web framework. From version 2.10.10 to before version 5.18.1, this issue concerns Astro's remotePatterns path enforcement for remote URLs used by server-side fetchers such as the image optimization endpoint. The path matching logic for / wildcards is unanchored, so a pathname that...

CVE-2026-33769

CVE-2026-33769 affects the Astro web framework. From version 2.10.10 up to before 5.18.1, the remotePatterns path enforcement for remote URLs used by server-side fetchers (e.g., image optimization) uses an unanchored match for /* wildcards, allowing a pathname containing the allowed prefix later ...