DEBIAN-CVE-2026-48522

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Source
https://security-tracker.debian.org/tracker/CVE-2026-48522
Import Source
https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-48522.json
JSON Data
https://api.osv.dev/v1/vulns/DEBIAN-CVE-2026-48522
Upstream
  • CVE-2026-48522
Published
2026-05-28T16:16:29.150Z
Modified
2026-05-29T09:00:24.748229935Z
Severity
  • 4.2 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:N CVSS Calculator
Summary
[none]
Details

PyJWT is a JSON Web Token implementation in Python. Prior to 2.13.0, PyJWKClient passes its uri argument directly to urllib.request.urlopen() which uses Python stdlib's default OpenerDirector registering HTTPHandler, HTTPSHandler, FTPHandler, FileHandler, and DataHandler. There is currently no documented option to restrict which schemes PyJWKClient will fetch. If an application's jku URL ingestion path accepts attacker-influenced URLs (e.g., from JWT header, configuration file, OAuth flow parameter), the attacker can cause PyJWKClient to read arbitrary local files via file:// (SSRF on local filesystem), cause PyJWKClient to attempt FTP / data-URI fetches (broader SSRF surface), or forge tokens that PyJWT verifies as valid. The library does not directly return non-HTTP(S) URI contents to the attacker; the chained "plant a JWKS to forge tokens" scenario described in the original report requires additional application-layer flaws (attacker write access to a filesystem path, untrusted jku derivation) that this fix does not address. This vulnerability is fixed in 2.13.0.

References

Affected packages

Debian:11 / pyjwt

Package

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

Affected ranges

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

Affected versions

1.*
1.7.1-2
1.7.1-2+deb11u1
2.*
2.1.0-1~bpo11+1
2.1.0-1
2.3.0-1
2.4.0-1
2.4.0-2
2.6.0-1
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

Ecosystem specific 

{
    "urgency": "not yet assigned"
}

Database specific

source 
"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-48522.json"

Debian:12 / pyjwt

Package

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

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown 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

Ecosystem specific 

{
    "urgency": "not yet assigned"
}

Database specific

source 
"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-48522.json"

Debian:13 / pyjwt

Package

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

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown 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

Ecosystem specific 

{
    "urgency": "not yet assigned"
}

Database specific

source 
"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-48522.json"

Debian:14 / pyjwt

Package

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

Affected ranges

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

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-2026-48522.json"