DEBIAN-CVE-2026-53939
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).
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/versions0.6.2.1-1+deb12u1Source reference:
/affected/0/versions0.6.2.2-1Source reference:
/affected/0/versions0.6.2.3-1Source reference:
/affected/0/versions0.6.2.4-1Source reference:
/affected/0/versions0.6.2.7-1Source reference:
/affected/0/versions0.6.2.8-1Source 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/versions0.6.2.4-1Source 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
- Added to Heist Feed
- Publisher date