CVE catalog
CVE-2025-62706
Authlib vulnerabilities
- Severity
- Medium · CVSS 6.5
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H - Published
- Source
- [NVD] · [CVE record]
- EPSS
- 0.46% · Oct 25, 2026
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.
Vulnerable and fixed packages
Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.
| Distribution | Package | Release | Version | Status |
|---|---|---|---|---|
| Debian | python-authlib | sid | 1.7.2-2 | fixed |
| Debian | python-authlib | forky | 1.7.2-2 | fixed |
| Debian | python-authlib | trixie | 1.6.0-1+deb13u1 | fixed |
| Debian | python-authlib | bookworm | 1.2.0-1+deb12u1 | fixed |
| Debian | python-authlib | bookworm-security | 1.2.0-1+deb12u2 | fixed |
| Ubuntu | python-authlib | noble | Not reported | vulnerable |
| Ubuntu | python-authlib | noble | 1.3.0-1ubuntu0.1~esm1 | fixed |
| Ubuntu | python-authlib-doc | noble | 1.3.0-1ubuntu0.1~esm1 | fixed |
| Ubuntu | python3-authlib | noble | 1.3.0-1ubuntu0.1~esm1 | fixed |
| Cpe | authlib | Not reported | 1.6.5 | fixed |
| Ubuntu | python-authlib | pro | 1.6.0-1 | vulnerable |
| Ubuntu | python-authlib | pro | 1.6.5-1 | vulnerable |
| Ubuntu | python-authlib | pro | 1.6.6-1 | vulnerable |
| Ubuntu | python-authlib | pro | 1.6.7-1 | vulnerable |
| Ubuntu | python-authlib | pro | 1.6.7-1ubuntu0.1~esm1 | vulnerable |
| Ubuntu | python-authlib | 25.10 | 1.5.1-1 | vulnerable |
| Ubuntu | python-authlib | 25.10 | 1.5.2-1 | vulnerable |
| Ubuntu | python-authlib | 25.10 | 1.6.0-1 | vulnerable |
| Suse | python-Authlib | linux enterprise module for python 3 15 sp6 | 1.3.1-150600.3.9.1 | fixed |
| Suse | python-Authlib | linux enterprise module for python 3 15 sp7 | 1.3.1-150600.3.9.1 | fixed |
| Opensuse | python-Authlib | leap 15.6 | 1.3.1-150600.3.9.1 | fixed |
Fixed-version evidence
| Distribution | Package | Type | Release | Fixed version | Urgency | Origin | Bugs |
|---|---|---|---|---|---|---|---|
| Debian | python-authlib | source | sid | 1.6.5-1 | not yet assigned | Not reported | Not reported |
| Debian | python-authlib | source | forky | 1.6.5-1 | not yet assigned | Not reported | Not reported |
| Debian | python-authlib | source | trixie | 1.6.0-1+deb13u1 | not yet assigned | Not reported | Not reported |
| Debian | python-authlib | source | bookworm | 1.2.0-1+deb12u1 | not yet assigned | Not reported | Not reported |
| Ubuntu | python-authlib | deb | noble | 1.3.0-1ubuntu0.1~esm1 | Not reported | Not reported | Not reported |
| Ubuntu | python-authlib-doc | deb | noble | 1.3.0-1ubuntu0.1~esm1 | Not reported | Not reported | Not reported |
| Ubuntu | python3-authlib | deb | noble | 1.3.0-1ubuntu0.1~esm1 | Not reported | Not reported | Not reported |
| Cpe | authlib | cpe | Not reported | 1.6.5 | Not reported | NVD-CVE-2025-62706 | Not reported |
| Suse | python-Authlib | rpm | linux enterprise module for python 3 15 sp6 | 1.3.1-150600.3.9.1 | Not reported | SUSE-SU-2025:3842-1 | Not reported |
| Suse | python-Authlib | rpm | linux enterprise module for python 3 15 sp7 | 1.3.1-150600.3.9.1 | Not reported | SUSE-SU-2025:3842-1 | Not reported |
| Opensuse | python-Authlib | rpm | leap 15.6 | 1.3.1-150600.3.9.1 | Not reported | SUSE-SU-2025:3842-1 | Not reported |
OpenFactory catalog packages
[Debian 12 (Bookworm)]
- [python3-authlib]Fixed
Source package: [python-authlib]
Details (4)
1.2.0-1+deb12u1· all · bookwormFixed · Fixed:
1.2.0-1+deb12u1usn · python-authlib · debian · bookworm; usn · python-authlib · debian · 12
1.2.0-1+deb12u1· all · bookwormFixed · Fixed:
1.2.0-1+deb12u1usn · python-authlib · debian · bookworm; usn · python-authlib · debian · 12
1.2.0-1+deb12u2· all · bookworm-securityFixed · Fixed:
1.2.0-1+deb12u1usn · python-authlib · debian · bookworm; usn · python-authlib · debian · 12
1.2.0-1+deb12u2· all · bookworm-securityFixed · Fixed:
1.2.0-1+deb12u1usn · python-authlib · debian · bookworm; usn · python-authlib · debian · 12
- [python-authlib-doc]Fixed
Source package: [python-authlib]
Details (4)
1.2.0-1+deb12u1· all · bookwormFixed · Fixed:
1.2.0-1+deb12u1usn · python-authlib · debian · bookworm; usn · python-authlib · debian · 12
1.2.0-1+deb12u1· all · bookwormFixed · Fixed:
1.2.0-1+deb12u1usn · python-authlib · debian · bookworm; usn · python-authlib · debian · 12
1.2.0-1+deb12u2· all · bookworm-securityFixed · Fixed:
1.2.0-1+deb12u1usn · python-authlib · debian · bookworm; usn · python-authlib · debian · 12
1.2.0-1+deb12u2· all · bookworm-securityFixed · Fixed:
1.2.0-1+deb12u1usn · python-authlib · debian · bookworm; usn · python-authlib · debian · 12
[Debian 13 (Trixie)]
- [python3-authlib]Fixed
Source package: [python-authlib]
Details (2)
1.6.0-1+deb13u1· all · trixieFixed · Fixed:
1.6.0-1+deb13u1usn · python-authlib · debian · 13
1.6.0-1+deb13u1· all · trixieFixed · Fixed:
1.6.0-1+deb13u1usn · python-authlib · debian · 13
- [python-authlib-doc]Fixed
Source package: [python-authlib]
Details (2)
1.6.0-1+deb13u1· all · trixieFixed · Fixed:
1.6.0-1+deb13u1usn · python-authlib · debian · 13
1.6.0-1+deb13u1· all · trixieFixed · Fixed:
1.6.0-1+deb13u1usn · python-authlib · debian · 13
Observed:
References
- [https://ftp.suse.com/pub/projects/security/csaf/suse-su-2025_3842-1.json]
- [https://nvd.nist.gov/vuln/detail/CVE-2025-62706]
- [https://osv.dev/vulnerability/DEBIAN-CVE-2025-62706]
- [https://osv.dev/vulnerability/SUSE-SU-2025:3842-1]
- [https://osv.dev/vulnerability/UBUNTU-CVE-2025-62706]
- [https://security-tracker.debian.org/tracker/CVE-2025-62706]
- [https://security.access.redhat.com/data/csaf/v2/vex/2025/cve-2025-62706.json]
- [https://ubuntu.com/security/notices/USN-8065-1]
- [https://wid.cert-bund.de/.well-known/csaf/white/2026/wid-sec-w-2026-0120.json]
[CERT-Bund public advisories] · [Debian Security Tracker] · [FIRST EPSS] · [National Vulnerability Database (NVD)] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX] · [SUSE security advisories and VEX] · [Ubuntu Security Notices (USN)]