CVE-2026-53938

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{"affected": [{"affectedData": [{"product": "cjose", "vendor": "OpenIDC", "versions": [{"status": "affected", "version": "< 0.6.2.5"}]}], "source": "security-advisories@github.com"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "OpenIDC/cjose is a C library implementing the Javascript Object Signing and Encryption (JOSE). Prior to version 0.6.2.5, cjose's JWE decryption path for the AES Key Wrap key-management algorithms (`alg` = `A128KW`, `A192KW`, `A256KW`) does not validate the length of the attacker-supplied `encrypted_key` (JWE Encrypted Key) before unwrapping it into a fixed-size, heap-allocated Content Encryption Key (CEK) buffer. A remote, unauthenticated attacker who can submit a crafted JWE to an application that decrypts it with an AES-KW symmetric key can trigger an out-of-bounds heap write, corrupting the heap. This leads at minimum to a crash (denial of service) and, depending on the heap layout and allocator, may be leverageable for further memory-corruption impact. `cjose_jwe_import()` / `cjose_jwe_decrypt()` are pre-authentication entry points: they parse and process fully attacker-controlled input. Upgrade to cjose 0.6.2.5 to receive a patch. If upgrading is not immediately possible, reject the AES Key Wrap algorithms (`A128KW`/`A192KW`/`A256KW`) for untrusted JWEs at the application layer."}], "id": "CVE-2026-53938", "lastModified": "2026-09-10T19:57:48.533", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 8.2, "baseSeverity": "HIGH", "confidentialityImpact": "NONE", "integrityImpact": "LOW", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 4.2, "source": "security-advisories@github.com", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-53938", "options": [{"exploitation": "none"}, {"automatable": "yes"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-09-09T15:51:50.383252Z", "version": "2.0.3"}}]}, "published": "2026-09-09T00:17:31.557", "references": [{"source": "security-advisories@github.com", "url": "https://github.com/OpenIDC/cjose/commit/8c51d245273583a658f24ef7b08ba22f848a34a5"}, {"source": "security-advisories@github.com", "url": "https://github.com/OpenIDC/cjose/security/advisories/GHSA-75r7-f5cv-g3wj"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Awaiting Analysis", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-122"}, {"lang": "en", "value": "CWE-787"}], "source": "security-advisories@github.com", "type": "Secondary"}]}

{"bugzilla": {"description": "cjose: cjose: Heap buffer overflow in AES Key Wrap decryption leads to denial of service", "id": "2530240", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2530240"}, "csaw": false, "cvss3": {"cvss3_base_score": "8.2", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H", "status": "draft"}, "cwe": "CWE-787", "details": ["A flaw was found in cjose, a C library for Javascript Object Signing and Encryption (JOSE). A remote, unauthenticated attacker can exploit a heap buffer overflow vulnerability in the AES Key Wrap decryption process. By submitting a crafted Javascript Web Encryption (JWE) to an application, the attacker can trigger an out-of-bounds heap write. This can corrupt the heap, leading to a denial of service and potentially further memory corruption."], "mitigation": {"lang": "en:us", "value": "Applications using `cjose` should be configured to reject JWEs that specify the AES Key Wrap key-management algorithms (`A128KW`, `A192KW`, `A256KW`) when processing untrusted input. This application-layer rejection prevents the vulnerable decryption path from being exercised."}, "name": "CVE-2026-53938", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Affected", "package_name": "cjose", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Affected", "package_name": "mod_auth_openidc:2.3/cjose", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "cjose", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-09-08T23:25:30Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-53938\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-53938\nhttps://github.com/OpenIDC/cjose/commit/8c51d245273583a658f24ef7b08ba22f848a34a5\nhttps://github.com/OpenIDC/cjose/security/advisories/GHSA-75r7-f5cv-g3wj"], "threat_severity": "Important"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "[0,0.6.2.5)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "cna", "scores": [{"score": 100.0, "source": "cna"}]}, "original": {"product": "cjose", "source": "cna", "vendor": "OpenIDC"}, "product": "cjose", "vendor": "openidc"}], "created": "2026-09-09T08:45:07.372600+00:00", "updated": "2026-09-13T20:02:59.299444+00:00", "vendors": ["openidc", "openidc$PRODUCT$cjose"]}