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VulnerabilityPublished Updated

CVE-2024-37568: Python authlib · lepture Authlib before 1.3.1 has algorithm confusion with asymmetric public keys

Affects python-authlibSource GCVE Database

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Mentioned vulnerabilities

Authoritative record:CVE-2024-37568· High 7.5

Not known to be exploited · CVSS 7.5 High · fixed in 0.15.5-1ubuntu0.1~esm1 : patch python-authlib soon.

Data as of 9 Nov 2026, 14:35 UTC

CVSS 3.1 base score
7.5High
How severe the flaw is on the 0–10 CVSS scale.
Patch
Available – fixed in 0.15.5-1ubuntu0.1~esm1, 1.3.0-1ubuntu0.1~esm1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 3 Nov 2025

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 9 Nov 2026.

What to do

Upgrade the Ubuntu python-authlib to 0.15.5-1ubuntu0.1~esm1 (package) or 1.3.0-1ubuntu0.1~esm1 (package).

Affected software

ProductAffectedFixed in
Ubuntu 26.10python-authlibpkg:deb/ubuntu/python-authlib?arch=source&distro=stonkingOther threatsAffected
  • =1.6.7-1
  • =1.7.2-1
  • =1.7.2-2
Fixed in–
Ubuntu 25.10python-authlibpkg:deb/ubuntu/python-authlib?arch=source&distro=questingOther threatsAffected
  • =1.5.1-1
  • =1.5.2-1
  • =1.6.0-1
Fixed in–
Ubuntu Pro 24.04 LTSpython-authlibpkg:deb/ubuntu/python-authlib?arch=source&distro=esm-apps/nobleOther threatsAffected
  • <1.3.0-1ubuntu0.1~esm1
Fixed in
  • 1.3.0-1ubuntu0.1~esm1
Ubuntu Pro 22.04 LTSpython-authlibpkg:deb/ubuntu/python-authlib?arch=source&distro=esm-apps/jammyOther threatsAffected
  • <0.15.5-1ubuntu0.1~esm1
Fixed in
  • 0.15.5-1ubuntu0.1~esm1

Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.

AI-suggested

A fix is available and users should update Authlib to versions 0.15.5-1ubuntu0.1~esm1 or 1.3.0-1ubuntu0.1~esm1 or later. Applying the official patches from the Ubuntu security notice USN-8065-1 will remediate this vulnerability. No additional mitigation steps are required once the update is applied.

Description

Authlib versions before 1.3.1 have a vulnerability where the JWT verification process allows algorithm confusion with asymmetric public keys. Specifically, if no algorithm is specified in a jwt.decode call, HMAC verification is permitted using any asymmetric public key. This flaw can enable attackers to bypass signature verification and forge tokens, potentially leading to authentication bypass or privilege escalation. The issue is fixed in versions 0.15.5-1ubuntu0.1~esm1 and 1.3.0-1ubuntu0.1~esm1.

References

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