DEBIAN-CVE-2026-27932
joserfc is a Python library that provides an implementation of several JSON Object Signing and Encryption (JOSE) standards. In 1.6.2 and earlier, a resource exhaustion vulnerability in joserfc allows an unauthenticated attacker to cause a Denial of Service (DoS) via CPU exhaustion. When the library decrypts a JSON Web Encryption (JWE) token using Password-Based Encryption (PBES2) algorithms, it reads the p2c (PBES2 Count) parameter directly from the token's protected header. This parameter defines the number of iterations for the PBKDF2 key derivation function. Because joserfc does not validate or bound this value, an attacker can specify an extremely large iteration count (e.g., 2^31 - 1), forcing the server to expend massive CPU resources processing a single token. This vulnerability exists at the JWA layer and impacts all high-level JWE and JWT decryption interfaces if PBES2 algorithms are allowed by the application's policy.
DEBIAN-CVE-2026-27932
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-2026-27932
joserfc
Source reference: /affected/0/package/name
- Affected versions
- 1.1.0-1
Source reference:
/affected/0/versions1.2.0-1Source reference:
/affected/0/versions1.2.2-1Source reference:
/affected/0/versions1.3.1-1Source reference:
/affected/0/versions1.3.2-1Source reference:
/affected/0/versions1.3.4-1Source reference:
/affected/0/versions1.4.0-1Source reference:
/affected/0/versions1.4.1-1Source reference:
/affected/0/versions1.4.3-1Source reference:
/affected/0/versions1.5.0-1Source reference:
/affected/0/versions1.6.0-1Source reference:
/affected/0/versions1.6.1-1Source reference:
/affected/0/versions1.6.2-1Source reference:
/affected/0/versions1.6.3-1Source reference:
/affected/0/versions1.6.4-1Source reference:
/affected/0/versions1.6.5-1Source reference:
/affected/0/versions1.6.8-1Source reference:
/affected/0/versions1.7.0-1Source reference:
/affected/0/versions1.7.1-1Source reference:
/affected/0/versions1.7.2-1Source reference:
/affected/0/versions1.7.3-1Source reference:
/affected/0/versions1.7.4-1Source reference:
/affected/0/versions - Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
joserfc
Source reference: /affected/1/package/name
- Affected versions
- 1.1.0-1
Source reference:
/affected/1/versions1.2.0-1Source reference:
/affected/1/versions1.2.2-1Source reference:
/affected/1/versions1.3.1-1Source reference:
/affected/1/versions1.3.2-1Source reference:
/affected/1/versions1.3.4-1Source reference:
/affected/1/versions1.4.0-1Source reference:
/affected/1/versions1.4.1-1Source reference:
/affected/1/versions1.4.3-1Source reference:
/affected/1/versions1.5.0-1Source reference:
/affected/1/versions1.6.0-1Source reference:
/affected/1/versions1.6.1-1Source reference:
/affected/1/versions1.6.2-1Source reference:
/affected/1/versions - Fixed versions
- 1.6.3-1
Source reference:
/affected/1/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": "joserfc",
"purl": "pkg:deb/debian/joserfc?arch=source&distro=trixie",
"ecosystem": "Debian:13"
},
"versions": [
"1.1.0-1",
"1.2.0-1",
"1.2.2-1",
"1.3.1-1",
"1.3.2-1",
"1.3.4-1",
"1.4.0-1",
"1.4.1-1",
"1.4.3-1",
"1.5.0-1",
"1.6.0-1",
"1.6.1-1",
"1.6.2-1",
"1.6.3-1",
"1.6.4-1",
"1.6.5-1",
"1.6.8-1",
"1.7.0-1",
"1.7.1-1",
"1.7.2-1",
"1.7.3-1",
"1.7.4-1"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-27932.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "1.6.3-1"
}
]
}
],
"package": {
"name": "joserfc",
"purl": "pkg:deb/debian/joserfc?arch=source&distro=forky",
"ecosystem": "Debian:14"
},
"versions": [
"1.1.0-1",
"1.2.0-1",
"1.2.2-1",
"1.3.1-1",
"1.3.2-1",
"1.3.4-1",
"1.4.0-1",
"1.4.1-1",
"1.4.3-1",
"1.5.0-1",
"1.6.0-1",
"1.6.1-1",
"1.6.2-1"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-27932.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
}
]Publisher severity
No explicit severity was provided.
- Event
- #56339 · Revision 1
- Added to Heist Feed
- Publisher date