DEBIAN-CVE-2025-62706

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Source
https://security-tracker.debian.org/tracker/CVE-2025-62706
Import Source
https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2025-62706.json
JSON Data
https://api.osv.dev/v1/vulns/DEBIAN-CVE-2025-62706
Upstream
Published
2025-10-22T22:15:35Z
Modified
2025-10-23T22:17:30.510381Z
Severity
  • 6.5 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H CVSS Calculator
Summary
[none]
Details

Authlib is a Python library which builds OAuth and OpenID Connect servers. Prior to version 1.6.5, Authlib’s JWE zip=DEF path performs unbounded DEFLATE decompression. A very small ciphertext can expand into tens or hundreds of megabytes on decrypt, allowing an attacker who can supply decryptable tokens to exhaust memory and CPU and cause denial of service. This issue has been patched in version 1.6.5. Workarounds for this issue involve rejecting or stripping zip=DEF for inbound JWEs at the application boundary, forking and add a bounded decompression guard via decompressobj().decompress(data, MAX_SIZE)) and returning an error when output exceeds a safe limit, or enforcing strict maximum token sizes and fail fast on oversized inputs; combine with rate limiting.

References

Affected packages

Debian:11 / python-authlib

Package

Name
python-authlib
Purl
pkg:deb/debian/python-authlib?arch=source

Affected ranges

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

Affected versions

0.*

0.15.4-1
0.15.4-2
0.15.5-1

1.*

1.0.0-1
1.0.1-1
1.1.0-1
1.1.0-2
1.2.0-1
1.2.1-1
1.3.0-1
1.3.0-2
1.3.0-3
1.3.1-1
1.3.2-1
1.3.2-2
1.4.0-1
1.4.1-1
1.5.0-1
1.5.1-1
1.5.2-1
1.6.0-1
1.6.1-1
1.6.3-1
1.6.4-1
1.6.5-1

Ecosystem specific 

{
    "urgency": "not yet assigned"
}

Debian:12 / python-authlib

Package

Name
python-authlib
Purl
pkg:deb/debian/python-authlib?arch=source

Affected ranges

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

Affected versions

1.*

1.2.0-1
1.2.1-1
1.3.0-1
1.3.0-2
1.3.0-3
1.3.1-1
1.3.2-1
1.3.2-2
1.4.0-1
1.4.1-1
1.5.0-1
1.5.1-1
1.5.2-1
1.6.0-1
1.6.1-1
1.6.3-1
1.6.4-1
1.6.5-1

Ecosystem specific 

{
    "urgency": "not yet assigned"
}

Debian:13 / python-authlib

Package

Name
python-authlib
Purl
pkg:deb/debian/python-authlib?arch=source

Affected ranges

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

Affected versions

1.*

1.6.0-1
1.6.1-1
1.6.3-1
1.6.4-1
1.6.5-1

Ecosystem specific 

{
    "urgency": "not yet assigned"
}

Debian:14 / python-authlib

Package

Name
python-authlib
Purl
pkg:deb/debian/python-authlib?arch=source

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
1.6.5-1

Affected versions

1.*

1.6.0-1
1.6.1-1
1.6.3-1
1.6.4-1

Ecosystem specific 

{
    "urgency": "not yet assigned"
}