DEBIAN-CVE-2026-48525
PyJWT is a JSON Web Token implementation in Python. From 2.8.0 to 2.12.1, when verifying detached JWS tokens using the unencoded-payload option ("b64": false, RFC 7797), PyJWT performs Base64URL decoding of the compact-serialization payload segment before enforcing the detached-payload rules. For b64=false, PyJWT later discards that decoded payload and replaces it with the caller-provided detached_payload. In practice, this turns the middle segment into an attacker-controlled “work amplifier”: a remote client can supply an arbitrarily large Base64URL payload segment that forces CPU work + memory allocations even if the signature is invalid. This creates an unauthenticated DoS vector against any endpoint that verifies detached JWS using PyJWT. This vulnerability is fixed in 2.13.0.
DEBIAN-CVE-2026-48525
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-2026-48525
pyjwt
Source reference: /affected/0/package/name
- Affected versions
- 2.10.1-1
Source reference:
/affected/0/versions2.10.1-2Source reference:
/affected/0/versions2.10.1-3Source reference:
/affected/0/versions2.10.1-4Source reference:
/affected/0/versions2.11.0-2Source reference:
/affected/0/versions2.12.1-1Source reference:
/affected/0/versions2.13.0-1Source reference:
/affected/0/versions2.14.0-1Source reference:
/affected/0/versions2.15.0-1Source reference:
/affected/0/versions2.15.1-1Source reference:
/affected/0/versions2.6.0-1Source reference:
/affected/0/versions2.6.0-1+deb12u1Source reference:
/affected/0/versions2.7.0-1Source reference:
/affected/0/versions - Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
pyjwt
Source reference: /affected/1/package/name
- Affected versions
- 2.10.1-2
Source reference:
/affected/1/versions2.10.1-2+deb13u1Source reference:
/affected/1/versions2.10.1-3Source reference:
/affected/1/versions2.10.1-4Source reference:
/affected/1/versions2.11.0-2Source reference:
/affected/1/versions2.12.1-1Source reference:
/affected/1/versions2.13.0-1Source reference:
/affected/1/versions2.14.0-1Source reference:
/affected/1/versions2.15.0-1Source reference:
/affected/1/versions2.15.1-1Source reference:
/affected/1/versions - Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
pyjwt
Source reference: /affected/2/package/name
- Affected versions
- 2.10.1-2
Source reference:
/affected/2/versions2.10.1-3Source reference:
/affected/2/versions2.10.1-4Source reference:
/affected/2/versions2.11.0-2Source reference:
/affected/2/versions2.12.1-1Source reference:
/affected/2/versions - Fixed versions
- 2.13.0-1
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": "pyjwt",
"purl": "pkg:deb/debian/pyjwt?arch=source&distro=bookworm",
"ecosystem": "Debian:12"
},
"versions": [
"2.10.1-1",
"2.10.1-2",
"2.10.1-3",
"2.10.1-4",
"2.11.0-2",
"2.12.1-1",
"2.13.0-1",
"2.14.0-1",
"2.15.0-1",
"2.15.1-1",
"2.6.0-1",
"2.6.0-1+deb12u1",
"2.7.0-1"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-48525.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "pyjwt",
"purl": "pkg:deb/debian/pyjwt?arch=source&distro=trixie",
"ecosystem": "Debian:13"
},
"versions": [
"2.10.1-2",
"2.10.1-2+deb13u1",
"2.10.1-3",
"2.10.1-4",
"2.11.0-2",
"2.12.1-1",
"2.13.0-1",
"2.14.0-1",
"2.15.0-1",
"2.15.1-1"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-48525.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "2.13.0-1"
}
]
}
],
"package": {
"name": "pyjwt",
"purl": "pkg:deb/debian/pyjwt?arch=source&distro=forky",
"ecosystem": "Debian:14"
},
"versions": [
"2.10.1-2",
"2.10.1-3",
"2.10.1-4",
"2.11.0-2",
"2.12.1-1"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-48525.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
}
]Publisher severity
No explicit severity was provided.
- Event
- #57206 · Revision 1
- Added to Heist Feed
- Publisher date