CVE-2026-21713

A flaw was found in Node.js. The HMAC Hash-based Message Authentication Code verification process uses a comparison method that does not take a constant amount of time. This non-constant-time comparison can leak timing information, which, under specific conditions where precise timing measurement...

ALPINE-CVE-2026-21713

A flaw in Node.js HMAC verification uses a non-constant-time comparison when validating user-provided signatures, potentially leaking timing information proportional to the number of matching bytes. Under certain threat models where high-resolution timing measurements are possible, this behavior...

CVE-2026-21713

A flaw in Node.js HMAC verification uses a non-constant-time comparison when validating user-provided signatures, potentially leaking timing information proportional to the number of matching bytes. Under certain threat models where high-resolution timing measurements are possible, this behavior...

CVE-2026-21713

A flaw in Node.js HMAC verification uses a non-constant-time comparison when validating user-provided signatures, potentially leaking timing information proportional to the number of matching bytes. Under certain threat models where high-resolution timing measurements are possible, this behavior...

CVE-2026-21713

A flaw in Node.js HMAC verification uses a non-constant-time comparison when validating user-provided signatures, potentially leaking timing information proportional to the number of matching bytes. Under certain threat models where high-resolution timing measurements are possible, this behavior...

CVE-2026-21713

A flaw in Node.js HMAC verification uses a non-constant-time comparison when validating user-provided signatures, potentially leaking timing information proportional to the number of matching bytes. Under certain threat models where high-resolution timing measurements are possible, this behavior...

Linux Distros Unpatched Vulnerability : CVE-2026-21713

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available. - A flaw in Node.js HMAC verification uses a non-constant-time comparison when validating user-provided signatures, potentially leaking timing information...

CVE-2026-33143

OneUptime is a solution for monitoring and managing online services. Prior to version 10.0.34, the WhatsApp POST webhook handler /notification/whatsapp/webhook processes incoming status update events without verifying the Meta/WhatsApp X-Hub-Signature-256 HMAC signature, allowing any...

PT-2026-21958

Name of the Vulnerable Software and Affected Versions OpenFUN Richie LMS affected versions not specified Description The application uses a non-constant time comparison operator for HMAC signature verification within the sync course run from request function, located in...

CVE-2026-26717

An issue in OpenFUN Richie LMS in src/richie/apps/courses/api.py. The application used the non-constant time == operator for HMAC signature verification in the synccourserunfromrequest function. This allows remote attackers to forge valid signatures and bypass authentication by measuring response...

CVE-2026-26717

OpenFUN Richie (LMS) is affected. The issue is in src/richie/apps/courses/api.py: sync_course_run_from_request uses a non-constant time == operator for HMAC signature verification, enabling timing-based forgery of valid signatures and authentication bypass. Documented in Red Hat/Snyk advisories w...

Improper Verification of Cryptographic Signature

Overview Affected versions of this package are vulnerable to Improper Verification of Cryptographic Signature via the HMAC computation. An attacker can bypass intended challenge expiration and reuse previously solved challenges by submitting a valid proof-of-work with a modified expiration value,...

Amazon Linux 2023 : openvpn, openvpn-devel (ALAS2023-2025-1312)

It is, therefore, affected by a vulnerability as referenced in the ALAS2023-2025-1312 advisory. HMAC verification check: fix incorrect memcmp call NOTE: https://community.openvpn.net/Security%20Announcements/CVE-2025-13086 CVE-2025-13086 Tenable has extracted the preceding description block...

Important: openvpn

Issue Overview: HMAC verification check: fix incorrect memcmp call NOTE: https://community.openvpn.net/Security%20Announcements/CVE-2025-13086 CVE-2025-13086 Affected Packages: openvpn Issue Correction: Run dnf update openvpn --releasever 2023.9.20251208 or dnf update --advisory ALAS2023-2025-131...

EUVD-2025-201250

auth0/node-jws Improperly Verifies HMAC Signature...

CVE-2025-13086

Improper validation of source IP addresses in OpenVPN version 2.6.0 through 2.6.15 and 2.7alpha1 through 2.7rc1 allows an attacker to open a session from a different IP address which did not initiate the connection resulting in a denial of service for the originating client...

Ubuntu 24.04 LTS / 25.04 / 25.10 : OpenVPN vulnerability (USN-7898-1)

The remote Ubuntu 24.04 LTS / 25.04 / 25.10 host has a package installed that is affected by a vulnerability as referenced in the USN-7898-1 advisory. Joshua Rogers discovered that OpenVPN incorrectly handled HMAC verification checks. A remote attacker could possibly use this issue to bypass sour...

Ubuntu: Security Advisory (USN-7898-1)

The remote host is missing an update for the SPDX-FileCopyrightText: 2025 Greenbone AG Some text descriptions might be excerpted from a referenced sources, and are Copyright C by the respective right holders. SPDX-License-Identifier: GPL-2.0-only ifdescription...

Linux Distros Unpatched Vulnerability : CVE-2025-13086

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available. - Improper validation of source IP addresses in OpenVPN version 2.6.0 through 2.6.15 and 2.7alpha1 through 2.7rc1 allows an attacker to open a session from a...

FreeBSD : OpenVPN -- HMAC verification on source IP address ineffective (17a40d76-c3fd-11f0-b513-0da7be77c170)

The version of FreeBSD installed on the remote host is prior to tested version. It is, therefore, affected by a vulnerability as referenced in the 17a40d76-c3fd-11f0-b513-0da7be77c170 advisory. Arne Schwabe reports: Fix memcmp check for the hmac verification in the 3way handshake being inverted...