{ "document": { "aggregate_severity": { "text": "Critical" }, "category": "csaf_security_advisory", "csaf_version": "2.0", "distribution": { "text": "TuxCare License Agreement", "tlp": { "label": "WHITE", "url": "https://www.first.org/tlp/" } }, "lang": "en", "notes": [ { "category": "legal_disclaimer", "text": "This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Cloud Linux Inc. and provide a link to the original.", "title": "Terms of Use" }, { "category": "details", "text": "CVE-2026-53939: fix all-zero AES-CBC-HMAC content-encryption key", "title": "Details" } ], "publisher": { "category": "vendor", "contact_details": "https://tuxcare.com/contact/", "name": "TuxCare", "namespace": "https://tuxcare.com/" }, "references": [ { "category": "self", "summary": "https://cve.tuxcare.com/els/releases/CLSA-2026:1792598293", "url": "https://cve.tuxcare.com/els/releases/CLSA-2026:1792598293" }, { "category": "self", "summary": "Canonical URL", "url": "https://security.tuxcare.com/csaf/v2/els_os/tuxcare9.8esu/advisories/2026/clsa-2026_1792598293.json" } ], "tracking": { "current_release_date": "2026-10-21T15:58:56Z", "generator": { "date": "2026-10-21T15:58:56Z", "engine": { "name": "pyCSAF" } }, "id": "CLSA-2026:1792598293", "initial_release_date": "2026-10-21T15:58:56Z", "revision_history": [ { "date": "2026-10-21T15:58:56Z", "number": "1", "summary": "Initial version" } ], "status": "final", "version": "1" }, "title": "cjose: Fix of CVE-2026-53939" }, "product_tree": { "branches": [ { "branches": [ { "branches": [ { "category": "product_name", "name": "AlmaLinux 9.8", "product": { "name": "AlmaLinux 9.8", "product_id": "AlmaLinux-9.8", "product_identification_helper": { "cpe": "cpe:2.3:o:almalinux:almalinux:9.8:*:*:*:*:*:*:*" } } } ], "category": "product_family", "name": "AlmaLinux" } ], "category": "vendor", "name": "AlmaLinux OS Foundation" }, { "branches": [ { "branches": [ { "category": "product_name", "name": "Rocky Linux 9.8", "product": { "name": "Rocky Linux 9.8", "product_id": "Rocky Linux-9.8", "product_identification_helper": { "cpe": "cpe:2.3:o:resf:rocky_linux:9.8:*:*:*:*:*:*:*" } } } ], "category": "product_family", "name": "Rocky Linux" } ], "category": "vendor", "name": "Rocky Linux" }, { "branches": [ { "branches": [ { "category": "product_version", "name": "cjose-devel-0:0.6.1-17.el9.tuxcare.els1.x86_64", "product": { "name": "cjose-devel-0:0.6.1-17.el9.tuxcare.els1.x86_64", "product_id": "cjose-devel-0:0.6.1-17.el9.tuxcare.els1.x86_64", "product_identification_helper": { "purl": "pkg:rpm/tuxcare/cjose-devel@0.6.1-17.el9.tuxcare.els1?arch=x86_64" } } }, { "category": "product_version", "name": "cjose-0:0.6.1-17.el9.tuxcare.els1.x86_64", "product": { "name": "cjose-0:0.6.1-17.el9.tuxcare.els1.x86_64", "product_id": "cjose-0:0.6.1-17.el9.tuxcare.els1.x86_64", "product_identification_helper": { "purl": "pkg:rpm/tuxcare/cjose@0.6.1-17.el9.tuxcare.els1?arch=x86_64" } } } ], "category": "architecture", "name": "x86_64" }, { "branches": [ { "category": "product_version", "name": "cjose-devel-0:0.6.1-17.el9.tuxcare.els1.aarch64", "product": { "name": "cjose-devel-0:0.6.1-17.el9.tuxcare.els1.aarch64", "product_id": "cjose-devel-0:0.6.1-17.el9.tuxcare.els1.aarch64", "product_identification_helper": { "purl": "pkg:rpm/tuxcare/cjose-devel@0.6.1-17.el9.tuxcare.els1?arch=aarch64" } } }, { "category": "product_version", "name": "cjose-0:0.6.1-17.el9.tuxcare.els1.aarch64", "product": { "name": "cjose-0:0.6.1-17.el9.tuxcare.els1.aarch64", "product_id": "cjose-0:0.6.1-17.el9.tuxcare.els1.aarch64", "product_identification_helper": { "purl": "pkg:rpm/tuxcare/cjose@0.6.1-17.el9.tuxcare.els1?arch=aarch64" } } } ], "category": "architecture", "name": "aarch64" }, { "branches": [ { "category": "product_version", "name": "cjose-devel-0:0.6.1-17.el9.tuxcare.els1.i686", "product": { "name": "cjose-devel-0:0.6.1-17.el9.tuxcare.els1.i686", "product_id": "cjose-devel-0:0.6.1-17.el9.tuxcare.els1.i686", "product_identification_helper": { "purl": "pkg:rpm/tuxcare/cjose-devel@0.6.1-17.el9.tuxcare.els1?arch=i686" } } }, { "category": "product_version", "name": "cjose-0:0.6.1-17.el9.tuxcare.els1.i686", "product": { "name": "cjose-0:0.6.1-17.el9.tuxcare.els1.i686", "product_id": "cjose-0:0.6.1-17.el9.tuxcare.els1.i686", "product_identification_helper": { "purl": "pkg:rpm/tuxcare/cjose@0.6.1-17.el9.tuxcare.els1?arch=i686" } } } ], "category": "architecture", "name": "i686" } ], "category": "vendor", "name": "TuxCare" } ], "relationships": [ { "category": "default_component_of", "full_product_name": { "name": "cjose-devel-0:0.6.1-17.el9.tuxcare.els1.x86_64 as a component of AlmaLinux 9.8", "product_id": "AlmaLinux-9.8:cjose-devel-0:0.6.1-17.el9.tuxcare.els1.x86_64" }, "product_reference": "cjose-devel-0:0.6.1-17.el9.tuxcare.els1.x86_64", "relates_to_product_reference": "AlmaLinux-9.8" }, { "category": "default_component_of", "full_product_name": { "name": "cjose-devel-0:0.6.1-17.el9.tuxcare.els1.aarch64 as a component of AlmaLinux 9.8", "product_id": "AlmaLinux-9.8:cjose-devel-0:0.6.1-17.el9.tuxcare.els1.aarch64" }, "product_reference": "cjose-devel-0:0.6.1-17.el9.tuxcare.els1.aarch64", "relates_to_product_reference": "AlmaLinux-9.8" }, { "category": "default_component_of", "full_product_name": { "name": "cjose-devel-0:0.6.1-17.el9.tuxcare.els1.i686 as a component of AlmaLinux 9.8", "product_id": "AlmaLinux-9.8:cjose-devel-0:0.6.1-17.el9.tuxcare.els1.i686" }, "product_reference": "cjose-devel-0:0.6.1-17.el9.tuxcare.els1.i686", "relates_to_product_reference": "AlmaLinux-9.8" }, { "category": "default_component_of", "full_product_name": { "name": "cjose-0:0.6.1-17.el9.tuxcare.els1.aarch64 as a component of AlmaLinux 9.8", "product_id": "AlmaLinux-9.8:cjose-0:0.6.1-17.el9.tuxcare.els1.aarch64" }, "product_reference": "cjose-0:0.6.1-17.el9.tuxcare.els1.aarch64", "relates_to_product_reference": "AlmaLinux-9.8" }, { "category": "default_component_of", "full_product_name": { "name": "cjose-0:0.6.1-17.el9.tuxcare.els1.i686 as a component of AlmaLinux 9.8", "product_id": "AlmaLinux-9.8:cjose-0:0.6.1-17.el9.tuxcare.els1.i686" }, "product_reference": "cjose-0:0.6.1-17.el9.tuxcare.els1.i686", "relates_to_product_reference": "AlmaLinux-9.8" }, { "category": "default_component_of", "full_product_name": { "name": "cjose-0:0.6.1-17.el9.tuxcare.els1.x86_64 as a component of AlmaLinux 9.8", "product_id": "AlmaLinux-9.8:cjose-0:0.6.1-17.el9.tuxcare.els1.x86_64" }, "product_reference": "cjose-0:0.6.1-17.el9.tuxcare.els1.x86_64", "relates_to_product_reference": "AlmaLinux-9.8" }, { "category": "default_component_of", "full_product_name": { "name": "cjose-devel-0:0.6.1-17.el9.tuxcare.els1.x86_64 as a component of Rocky Linux 9.8", "product_id": "Rocky Linux-9.8:cjose-devel-0:0.6.1-17.el9.tuxcare.els1.x86_64" }, "product_reference": "cjose-devel-0:0.6.1-17.el9.tuxcare.els1.x86_64", "relates_to_product_reference": "Rocky Linux-9.8" }, { "category": "default_component_of", "full_product_name": { "name": "cjose-devel-0:0.6.1-17.el9.tuxcare.els1.aarch64 as a component of Rocky Linux 9.8", "product_id": "Rocky Linux-9.8:cjose-devel-0:0.6.1-17.el9.tuxcare.els1.aarch64" }, "product_reference": "cjose-devel-0:0.6.1-17.el9.tuxcare.els1.aarch64", "relates_to_product_reference": "Rocky Linux-9.8" }, { "category": "default_component_of", "full_product_name": { "name": "cjose-devel-0:0.6.1-17.el9.tuxcare.els1.i686 as a component of Rocky Linux 9.8", "product_id": "Rocky Linux-9.8:cjose-devel-0:0.6.1-17.el9.tuxcare.els1.i686" }, "product_reference": "cjose-devel-0:0.6.1-17.el9.tuxcare.els1.i686", "relates_to_product_reference": "Rocky Linux-9.8" }, { "category": "default_component_of", "full_product_name": { "name": "cjose-0:0.6.1-17.el9.tuxcare.els1.aarch64 as a component of Rocky Linux 9.8", "product_id": "Rocky Linux-9.8:cjose-0:0.6.1-17.el9.tuxcare.els1.aarch64" }, "product_reference": "cjose-0:0.6.1-17.el9.tuxcare.els1.aarch64", "relates_to_product_reference": "Rocky Linux-9.8" }, { "category": "default_component_of", "full_product_name": { "name": "cjose-0:0.6.1-17.el9.tuxcare.els1.i686 as a component of Rocky Linux 9.8", "product_id": "Rocky Linux-9.8:cjose-0:0.6.1-17.el9.tuxcare.els1.i686" }, "product_reference": "cjose-0:0.6.1-17.el9.tuxcare.els1.i686", "relates_to_product_reference": "Rocky Linux-9.8" }, { "category": "default_component_of", "full_product_name": { "name": "cjose-0:0.6.1-17.el9.tuxcare.els1.x86_64 as a component of Rocky Linux 9.8", "product_id": "Rocky Linux-9.8:cjose-0:0.6.1-17.el9.tuxcare.els1.x86_64" }, "product_reference": "cjose-0:0.6.1-17.el9.tuxcare.els1.x86_64", "relates_to_product_reference": "Rocky Linux-9.8" } ] }, "vulnerabilities": [ { "cve": "CVE-2026-53939", "notes": [ { "category": "description", "text": "OpenIDC/cjose is a C library implementing the Javascript Object Signing and Encryption (JOSE). In versions 0.6.1 through 0.6.2.5, when cjose encrypts a JWE using an AES-CBC-HMAC content-encryption algorithm (`A128CBC-HS256`, `A192CBC-HS384`, or `A256CBC-HS512`) together with any key-management algorithm that generates a fresh content-encryption key (CEK), the CEK is all zero bytes instead of being randomly generated. The resulting JWE is therefore encrypted and authenticated under a fixed, publicly known key, so anyone who obtains the JWE can recover the plaintext and forge or modify the content. This is fixed in version 0.6.2.6 by `_cjose_jwe_set_cek_aes_cbc()` generating the CEK from `RAND_bytes`. A regression test asserts that the `encrypted_key` differs across two encryptions for each AES-CBC-HMAC variant. Until upgrading, for data encrypted with cjose, three options are available. Use an AES-GCM `enc` (`A128GCM` / `A192GCM` / `A256GCM`) instead of an AES-CBC-HMAC `enc`, use `alg=dir` with a caller-supplied CEK, or avoid using cjose for JWE encryption with the affected algorithm pair. These are mitigations for new ciphertexts only; data already encrypted under the zero key remains compromised and should be re-encrypted (and any secrets it contained rotated).", "title": "Vulnerability description" } ], "product_status": { "fixed": [ "AlmaLinux-9.8:cjose-0:0.6.1-17.el9.tuxcare.els1.aarch64", "AlmaLinux-9.8:cjose-0:0.6.1-17.el9.tuxcare.els1.i686", "AlmaLinux-9.8:cjose-0:0.6.1-17.el9.tuxcare.els1.x86_64", "AlmaLinux-9.8:cjose-devel-0:0.6.1-17.el9.tuxcare.els1.aarch64", "AlmaLinux-9.8:cjose-devel-0:0.6.1-17.el9.tuxcare.els1.i686", "AlmaLinux-9.8:cjose-devel-0:0.6.1-17.el9.tuxcare.els1.x86_64", "Rocky Linux-9.8:cjose-0:0.6.1-17.el9.tuxcare.els1.aarch64", "Rocky Linux-9.8:cjose-0:0.6.1-17.el9.tuxcare.els1.i686", "Rocky Linux-9.8:cjose-0:0.6.1-17.el9.tuxcare.els1.x86_64", "Rocky Linux-9.8:cjose-devel-0:0.6.1-17.el9.tuxcare.els1.aarch64", "Rocky Linux-9.8:cjose-devel-0:0.6.1-17.el9.tuxcare.els1.i686", "Rocky Linux-9.8:cjose-devel-0:0.6.1-17.el9.tuxcare.els1.x86_64" ] }, "references": [ { "category": "self", "summary": "Canonical URL", "url": "https://cve.tuxcare.com/els/cve/CVE-2026-53939" } ], "release_date": "2026-09-08T23:36:13Z", "remediations": [ { "category": "vendor_fix", "date": "2026-10-21T15:58:15.244785Z", "details": "Details on how to apply the fix are available at: https://cve.tuxcare.com/els/releases/CLSA-2026:1792598293", "product_ids": [ "AlmaLinux-9.8:cjose-0:0.6.1-17.el9.tuxcare.els1.aarch64", "AlmaLinux-9.8:cjose-0:0.6.1-17.el9.tuxcare.els1.i686", "AlmaLinux-9.8:cjose-0:0.6.1-17.el9.tuxcare.els1.x86_64", "AlmaLinux-9.8:cjose-devel-0:0.6.1-17.el9.tuxcare.els1.aarch64", "AlmaLinux-9.8:cjose-devel-0:0.6.1-17.el9.tuxcare.els1.i686", "AlmaLinux-9.8:cjose-devel-0:0.6.1-17.el9.tuxcare.els1.x86_64", "Rocky Linux-9.8:cjose-0:0.6.1-17.el9.tuxcare.els1.aarch64", "Rocky Linux-9.8:cjose-0:0.6.1-17.el9.tuxcare.els1.i686", "Rocky Linux-9.8:cjose-0:0.6.1-17.el9.tuxcare.els1.x86_64", "Rocky Linux-9.8:cjose-devel-0:0.6.1-17.el9.tuxcare.els1.aarch64", "Rocky Linux-9.8:cjose-devel-0:0.6.1-17.el9.tuxcare.els1.i686", "Rocky Linux-9.8:cjose-devel-0:0.6.1-17.el9.tuxcare.els1.x86_64" ], "url": "https://cve.tuxcare.com/els/releases/CLSA-2026:1792598293" } ], "threats": [ { "category": "impact", "details": "Critical" } ] } ] }