# CVE-2023-37464: Incorrect Authentication Tag length usage in AES GCM decryption in OpenIDC/cjose CVE-2023-37464 is fixed in 4 products on 1 platform, first by libcjose0 0.6.0+dfsg1-1ubuntu0.1~esm1, released July 14, 2023. It is not reported as exploited. Patch Radar priority: High. - Web page: https://patchblox.com/security/cve/CVE-2023-37464 - Priority: High - CVSS: 7.5 (high) - EPSS: 0.0071 - CISA KEV: not listed - Exploited (vendor report): no - Publicly disclosed: no - Published: Jul 14, 2023 - Weakness: Use of a Broken or Risky Cryptographic Algorithm - Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2023-37464 ## Description 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 allows an attacker to provide a truncated Authentication Tag and to modify the JWE accordingly. Users should upgrade to a version >= 0.6.2.2. Users unable to upgrade should avoid using AES GCM encryption and replace it with another encryption algorithm (e.g. AES CBC). ## Where it's fixed | Platform | Product | Fixed in | Fix | Released | |---|---|---|---|---| | Linux | cjose Debian 11.6 (bullseye) | 0.6.1+dfsg1-1+deb11u1 | [DSA-5472-1](https://patchblox.com/security/data/fix/linux/dsa-5472-1.md) | Aug 8, 2023 | | Linux | cjose Debian 12.15 (bookworm) | 0.6.2.1-1+deb12u1 | [DSA-5472-1](https://patchblox.com/security/data/fix/linux/dsa-5472-1.md) | Aug 8, 2023 | | Linux | cjose Debian 13.5 (trixie) | 0.6.2.2-1 | [DEBIAN-CVE-2023-37464](https://patchblox.com/security/data/fix/linux/debian-cve-2023-37464.md) | Jul 14, 2023 | | Linux | cjose Debian 14 | 0.6.2.2-1 | [DEBIAN-CVE-2023-37464](https://patchblox.com/security/data/fix/linux/debian-cve-2023-37464.md) | Jul 14, 2023 | | Linux | cjose RHEL 8 | 0:0.6.1-3.module+el8.8.0+19464+578f4546 | [RHSA-2023:4418](https://patchblox.com/security/data/fix/linux/rhsa-2023-4418.md) | Aug 1, 2023 | | Linux | cjose RHEL 9 | 0:0.6.1-13.el9_2 | [RHSA-2023:4411](https://patchblox.com/security/data/fix/linux/rhsa-2023-4411.md) | Aug 1, 2023 | | Linux | cjose almalinux 8 | 0.6.1-3.module_el8.8.0+3591+c9939da8 | [ALSA-2023:4418](https://patchblox.com/security/data/fix/linux/alsa-2023-4418.md) | Aug 1, 2023 | | Linux | cjose almalinux 9 | 0.6.1-13.el9_2.alma | [ALSA-2023:4411](https://patchblox.com/security/data/fix/linux/alsa-2023-4411.md) | Aug 1, 2023 | | Linux | cjose ol 8 | 0:0.6.1-3.module+el8.8.0+21137+b6cedbc2 | [ELSA-2023-4418](https://patchblox.com/security/data/fix/linux/elsa-2023-4418.md) | Aug 2, 2023 | | Linux | cjose ol 9 | 0:0.6.1-13.el9_2 | [ELSA-2023-4411](https://patchblox.com/security/data/fix/linux/elsa-2023-4411.md) | Aug 2, 2023 | | Linux | cjose rocky 8 | 0:0.6.1-3.module+el8.8.0+1406+4a7f5371 | [RLSA-2023:4418](https://patchblox.com/security/data/fix/linux/rlsa-2023-4418.md) | Aug 8, 2023 | | Linux | cjose-devel RHEL 8 | 0:0.6.1-3.module+el8.8.0+19464+578f4546 | [RHSA-2023:4418](https://patchblox.com/security/data/fix/linux/rhsa-2023-4418.md) | Aug 1, 2023 | | Linux | cjose-devel almalinux 8 | 0.6.1-3.module_el8.8.0+3591+c9939da8 | [ALSA-2023:4418](https://patchblox.com/security/data/fix/linux/alsa-2023-4418.md) | Aug 1, 2023 | | Linux | cjose-devel ol 8 | 0:0.6.1-3.module+el8.8.0+21137+b6cedbc2 | [ELSA-2023-4418](https://patchblox.com/security/data/fix/linux/elsa-2023-4418.md) | Aug 2, 2023 | | Linux | libcjose0 Ubuntu 18.04.6 LTS (bionic) | 0.6.0+dfsg1-1ubuntu0.1~esm1 | [libcjose0 0.6.0+dfsg1-1ubuntu0.1~esm1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-libcjose0-0.6.0-dfsg1-1ubuntu0.1-esm1.md) | Jul 14, 2023 | | Linux | libcjose0 Ubuntu 20.04 LTS (focal) | 0.6.1+dfsg1-1ubuntu0.1 | [libcjose0 0.6.1+dfsg1-1ubuntu0.1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-libcjose0-0.6.1-dfsg1-1ubuntu0.1.md) | Jul 14, 2023 | | Linux | libcjose0 Ubuntu 22.04.1 LTS (jammy) | 0.6.1+dfsg1-3ubuntu1.1 | [libcjose0 0.6.1+dfsg1-3ubuntu1.1](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-libcjose0-0.6.1-dfsg1-3ubuntu1.1.md) | Jul 14, 2023 | | Linux | mod_auth_openidc RHEL 8 | 0:2.4.9.4-1.module+el8.7.0+14797+4085fcb6 | [RHSA-2023:4418](https://patchblox.com/security/data/fix/linux/rhsa-2023-4418.md) | Aug 1, 2023 | | Linux | mod_auth_openidc almalinux 8 | 2.4.9.4-1.module_el8.7.0+3305+9a59f0c3 | [ALSA-2023:4418](https://patchblox.com/security/data/fix/linux/alsa-2023-4418.md) | Aug 1, 2023 | | Linux | mod_auth_openidc ol 8 | 0:2.4.9.4-1.module+el8.7.0+20769+fca4d9d0 | [ELSA-2023-4418](https://patchblox.com/security/data/fix/linux/elsa-2023-4418.md) | Aug 2, 2023 | | Linux | mod_auth_openidc rocky 8 | 0:2.4.9.4-1.module+el8.7.0+1061+55d14382 | [RLSA-2023:4418](https://patchblox.com/security/data/fix/linux/rlsa-2023-4418.md) | Aug 8, 2023 | --- Data as of 2026-11-08T06:59:42Z UTC. 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