DEBIAN-CVE-2026-39373
JWCrypto implements JWK, JWS, and JWE specifications using python-cryptography. Prior to 1.5.7, an unauthenticated attacker can exhaust server memory by sending crafted JWE tokens with ZIP compression. The existing patch for CVE-2024-28102 limits input token size to 250KB but does not validate the decompressed output size. An unauthenticated attacker can cause memory exhaustion on memory-constrained systems. A token under the 250KB input limit can decompress to approximately 100MB. This vulnerability is fixed in 1.5.7.
DEBIAN-CVE-2026-39373
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-2026-39373
python-jwcrypto
Source reference: /affected/0/package/name
- Affected versions
- 1.1.0-1
Source reference:
/affected/0/versions1.1.0-1+deb12u1Source reference:
/affected/0/versions1.5.4-1Source reference:
/affected/0/versions1.5.6-1Source reference:
/affected/0/versions1.5.6-1.1Source reference:
/affected/0/versions1.5.6-1.1~deb13u1Source reference:
/affected/0/versions1.5.6-1.2Source reference:
/affected/0/versions - Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
python-jwcrypto
Source reference: /affected/1/package/name
- Affected versions
- 1.5.6-1
Source reference:
/affected/1/versions - Fixed versions
- 1.5.6-1.1~deb13u1
Source reference:
/affected/1/ranges - Prerequisites
- Not stated in this record
python-jwcrypto
Source reference: /affected/2/package/name
- Affected versions
- 1.5.6-1
Source reference:
/affected/2/versions1.5.6-1.1~deb13u1Source reference:
/affected/2/versions - Fixed versions
- 1.5.6-1.1
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": "python-jwcrypto",
"purl": "pkg:deb/debian/python-jwcrypto?arch=source&distro=bookworm",
"ecosystem": "Debian:12"
},
"versions": [
"1.1.0-1",
"1.1.0-1+deb12u1",
"1.5.4-1",
"1.5.6-1",
"1.5.6-1.1",
"1.5.6-1.1~deb13u1",
"1.5.6-1.2"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-39373.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "1.5.6-1.1~deb13u1"
}
]
}
],
"package": {
"name": "python-jwcrypto",
"purl": "pkg:deb/debian/python-jwcrypto?arch=source&distro=trixie",
"ecosystem": "Debian:13"
},
"versions": [
"1.5.6-1"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-39373.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "1.5.6-1.1"
}
]
}
],
"package": {
"name": "python-jwcrypto",
"purl": "pkg:deb/debian/python-jwcrypto?arch=source&distro=forky",
"ecosystem": "Debian:14"
},
"versions": [
"1.5.6-1",
"1.5.6-1.1~deb13u1"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-39373.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
}
]Publisher severity
No explicit severity was provided.
- Event
- #56863 · Revision 1
- Added to Heist Feed
- Publisher date