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DEBIAN-CVE-2026-53939

Type: advisorySource: OSV1 source record

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).

Announced Source revision 1
Original source ↗

DEBIAN-CVE-2026-53939

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: osv:DEBIAN-CVE-2026-53939

cjose

Source reference: /affected/0/package/name

Affected versions
0.6.2.1-1

Source reference: /affected/0/versions

0.6.2.1-1+deb12u1

Source reference: /affected/0/versions

0.6.2.2-1

Source reference: /affected/0/versions

0.6.2.3-1

Source reference: /affected/0/versions

0.6.2.4-1

Source reference: /affected/0/versions

0.6.2.7-1

Source reference: /affected/0/versions

0.6.2.8-1

Source reference: /affected/0/versions

Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

cjose

Source reference: /affected/1/package/name

Affected versions
0.6.2.3-1

Source reference: /affected/1/versions

Fixed versions
0.6.2.3-1+deb13u1

Source reference: /affected/1/ranges

Prerequisites
Not stated in this record

cjose

Source reference: /affected/2/package/name

Affected versions
0.6.2.3-1

Source reference: /affected/2/versions

0.6.2.4-1

Source reference: /affected/2/versions

Fixed versions
0.6.2.7-1

Source reference: /affected/2/ranges

Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "ranges": [
      {
        "type": "ECOSYSTEM",
        "events": [
          {
            "introduced": "0"
          }
        ]
      }
    ],
    "package": {
      "name": "cjose",
      "purl": "pkg:deb/debian/cjose?arch=source&distro=bookworm",
      "ecosystem": "Debian:12"
    },
    "versions": [
      "0.6.2.1-1",
      "0.6.2.1-1+deb12u1",
      "0.6.2.2-1",
      "0.6.2.3-1",
      "0.6.2.4-1",
      "0.6.2.7-1",
      "0.6.2.8-1"
    ],
    "database_specific": {
      "source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-53939.json"
    },
    "ecosystem_specific": {
      "urgency": "not yet assigned"
    }
  },
  {
    "ranges": [
      {
        "type": "ECOSYSTEM",
        "events": [
          {
            "introduced": "0"
          },
          {
            "fixed": "0.6.2.3-1+deb13u1"
          }
        ]
      }
    ],
    "package": {
      "name": "cjose",
      "purl": "pkg:deb/debian/cjose?arch=source&distro=trixie",
      "ecosystem": "Debian:13"
    },
    "versions": [
      "0.6.2.3-1"
    ],
    "database_specific": {
      "source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-53939.json"
    },
    "ecosystem_specific": {
      "urgency": "not yet assigned"
    }
  },
  {
    "ranges": [
      {
        "type": "ECOSYSTEM",
        "events": [
          {
            "introduced": "0"
          },
          {
            "fixed": "0.6.2.7-1"
          }
        ]
      }
    ],
    "package": {
      "name": "cjose",
      "purl": "pkg:deb/debian/cjose?arch=source&distro=forky",
      "ecosystem": "Debian:14"
    },
    "versions": [
      "0.6.2.3-1",
      "0.6.2.4-1"
    ],
    "database_specific": {
      "source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-53939.json"
    },
    "ecosystem_specific": {
      "urgency": "not yet assigned"
    }
  }
]

Publisher severity

No explicit severity was provided.

Event
#57814 · Revision 1
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Publisher date
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