CVE-2026-5500

wolfSSL's wcPKCS7DecodeAuthEnvelopedData does not properly sanitize the AES-GCM authentication tag length received and has no lower bounds check. A man-in-the-middle can therefore truncate the mac field from 16 bytes to 1 byte, reducing the tag check from 2⁻¹²⁸ to 2⁻⁸...

CVE-2026-5500

CVE-2026-5500 affects wolfSSL (library) in wc_PKCS7_DecodeAuthEnvelopedData; the AES-GCM authentication tag length is not properly validated (no lower bound), allowing a MITM to truncate the MAC from 16 bytes to 1 byte and reduce tag verification strength from 2^-128 to 2^-8. This is described in...

Linux Distros Unpatched Vulnerability : CVE-2026-5500

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available. - wolfSSL's wcPKCS7DecodeAuthEnvelopedData does not properly sanitize the AES-GCM authentication tag length received and has no lower bounds check. A...

ANT-2026-P23DVQM2 · wolfSSL · crypto-failure

crypto-failure high CVE-2026-5500 Severity Claude high · Security research firm high · Maintainer - Discovered by Claude Mythos Preview SECURITY RESEARCH FIRM ANALYSIS Triage and disclosure were performed by Calif. Verdict: true positive Severity: high TIMELINE Dates from discovery through public...

cjose: AES GCM decryption uses the Tag length from the actual Authentication Tag provided in the JWE

A vulnerability was found in cjose. The cjose is a C library implementing the Javascript Object Signing and Encryption JOSE. The AES GCM decryption routine incorrectly uses the tag length from the actual Authentication Tag provided in the JSON Web Encryption JWE. A fixed length of 16 octets must ...

AZL-27659 CVE-2023-37464 affecting package cjose 0.6.1-6

OpenIDC/cjose is a C library implementing the Javascript Object Signing and Encryption JOSE. The AES GCM decryption routine incorrectly uses the Tag length from the actual Authentication Tag provided in the JWE. The spec says that a fixed length of 16 octets must be applied. Therefore this bug...

Fedora 28 : python-cryptography / python-cryptography-vectors (2018-a9fe5e183e)

New upstream release 2.3 Fixes possible tag truncation security bug in AEAD API, see RHBZ1602752 2.3 - 2018-07-18 - SECURITY ISSUE: finalizewithtag allowed tag truncation by default which can allow tag forgery in some cases. The method now enforces the mintaglength provided to the GCM constructor...

py-cryptography -- tag forgery vulnerability

The Python Cryptographic Authority PyCA project reports: finalizewithtag allowed tag truncation by default which can allow tag forgery in some cases. The method now enforces the mintaglength provided to the GCM constructor...