CVE-2026-53938

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Source
https://cve.org/CVERecord?id=CVE-2026-53938
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-53938.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-53938
Aliases
  • GHSA-75r7-f5cv-g3wj
Downstream
Published
2026-09-08T23:25:30Z
Modified
2026-09-10T08:13:49Z
Severity
  • 8.2 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H CVSS Calculator
Summary
OpenIDC/cjose has a heap buffer overflow in AES Key Wrap decryption (A128KW/A192KW/A256KW)
Details

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.

Database specific 
{
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
        "CWE-122",
        "CWE-787"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/53xxx/CVE-2026-53938.json"
}
References

Affected packages

Git / github.com/openidc/cjose

Affected ranges

Type
GIT
Repo
https://github.com/openidc/cjose
Events
Introduced
0 Unknown introduced commit / All previous commits are affected
Fixed
8c51d245273583a658f24ef7b08ba22f848a34a5
Database specific
Show details 
{
    "extracted_events": [
        {
            "introduced": "0"
        },
        {
            "fixed": "0.6.2.5"
        }
    ],
    "source": [
        "AFFECTED_FIELD",
        "REFERENCES"
    ]
}

Affected versions

0.*
0.1.2
0.2.0
0.3.0
0.4.0
0.4.1
0.5.0
0.5.1
0.6.0
0.6.1
Other
latest
v0.*
v0.6.2
v0.6.2.1
v0.6.2.2
v0.6.2.3
v0.6.2.4

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-53938.json"
vanir_signatures 
[
    {
        "deprecated": false,
        "digest": {
            "function_hash": "227948661207335015589447400002653325515",
            "length": 1191
        },
        "id": "CVE-2026-53938-200e94d1",
        "signature_type": "Function",
        "signature_version": "v1",
        "source": "https://github.com/openidc/cjose/commit/8c51d245273583a658f24ef7b08ba22f848a34a5",
        "target": {
            "file": "test/check_jwe.c",
            "function": "cjose_jwe_suite"
        }
    },
    {
        "deprecated": false,
        "digest": {
            "function_hash": "161931903890814537683872254549009418699",
            "length": 804
        },
        "id": "CVE-2026-53938-452d5e5d",
        "signature_type": "Function",
        "signature_version": "v1",
        "source": "https://github.com/openidc/cjose/commit/8c51d245273583a658f24ef7b08ba22f848a34a5",
        "target": {
            "file": "src/jwe.c",
            "function": "_cjose_jwe_decrypt_ek_aes_kw"
        }
    },
    {
        "deprecated": false,
        "digest": {
            "line_hashes": [
                "138060202361687335793341313506705854914",
                "9602786020914180282565357196378149638",
                "314060815727875009379907015202352312800",
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                "41156694486392137207876770394593059328",
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                "142102957200804462419006836527052069854"
            ],
            "threshold": 0.9
        },
        "id": "CVE-2026-53938-a0b76305",
        "signature_type": "Line",
        "signature_version": "v1",
        "source": "https://github.com/openidc/cjose/commit/8c51d245273583a658f24ef7b08ba22f848a34a5",
        "target": {
            "file": "test/check_jwe.c"
        }
    },
    {
        "deprecated": false,
        "digest": {
            "line_hashes": [
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                "275997964570305028092695272182276930776"
            ],
            "threshold": 0.9
        },
        "id": "CVE-2026-53938-e09779da",
        "signature_type": "Line",
        "signature_version": "v1",
        "source": "https://github.com/openidc/cjose/commit/8c51d245273583a658f24ef7b08ba22f848a34a5",
        "target": {
            "file": "src/jwe.c"
        }
    }
]
vanir_signatures_modified 
"2026-09-10T08:13:49Z"