DEBIAN-CVE-2026-48525

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Source
https://security-tracker.debian.org/tracker/CVE-2026-48525
Import Source
https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-48525.json
JSON Data
https://api.osv.dev/v1/vulns/DEBIAN-CVE-2026-48525
Upstream
Published
2026-05-28T16:16:29Z
Modified
2026-09-14T17:03:41Z
Severity
  • 5.3 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L CVSS Calculator
Summary
[none]
Details

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.

References

Affected packages

Debian:12 / pyjwt

Package

Name
pyjwt
Purl
pkg:deb/debian/pyjwt?arch=source&distro=bookworm

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected

Affected versions

2.*
2.6.0-1
2.6.0-1+deb12u1
2.7.0-1
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

Ecosystem specific 

{
    "urgency": "not yet assigned"
}

Database specific

source 
"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-48525.json"

Debian:13 / pyjwt

Package

Name
pyjwt
Purl
pkg:deb/debian/pyjwt?arch=source&distro=trixie

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected

Affected versions

2.*
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

Ecosystem specific 

{
    "urgency": "not yet assigned"
}

Database specific

source 
"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-48525.json"

Debian:14 / pyjwt

Package

Name
pyjwt
Purl
pkg:deb/debian/pyjwt?arch=source&distro=forky

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
2.13.0-1

Affected versions

2.*
2.10.1-2
2.10.1-3
2.10.1-4
2.11.0-2
2.12.1-1

Ecosystem specific 

{
    "urgency": "not yet assigned"
}

Database specific

source 
"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-48525.json"