CVE-2024-37568

lepture Authlib before 1.3.1 has algorithm confusion with asymmetric public keys. Unless an algorithm is specified in a jwt.decode call, HMAC verification is allowed with any asymmetric public key. (This is similar to CVE-2022-29217 and CVE-2024-33663.)
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
NISTNIST
7.5 HIGH
NETWORK
LOW
NONE
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
mitreCNA
---
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CVEADP
---
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CISA-ADPADP
7.5 HIGH
NETWORK
LOW
NONE
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Base Score
CVSS 3.x
EPSS Score
Percentile: 31%
VendorProductVersion
authlibauthlib
𝑥
< 1.3.1
𝑥
= Vulnerable software versions
Debian logo
Debian Releases
Debian Product
Codename
python-authlib
bullseye
vulnerable
bookworm
no-dsa
bullseye (security)
0.15.4-1+deb11u1
fixed
trixie
1.6.0-1
fixed
forky
1.6.5-1
fixed
sid
1.6.5-1
fixed
Ubuntu logo
Ubuntu Releases
Ubuntu Product
Codename
python-authlib
questing
needs-triage
plucky
needs-triage
oracular
ignored
noble
needed
mantic
ignored
jammy
needed
focal
dne
Common Weakness Enumeration
References
https://github.com/lepture/authlib/issues/654
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/FHJI32SN4FNAUVNALVGOKWHNSQ6XS3M5/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/IZI7HYGN7VZAYFV6UV3SRLYF7QGERXIU/
https://www.vicarius.io/vsociety/posts/algorithm-confusion-in-lepture-authlib-cve-2024-37568
https://github.com/lepture/authlib/issues/654
https://lists.debian.org/debian-lts-announce/2025/10/msg00032.html
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/FHJI32SN4FNAUVNALVGOKWHNSQ6XS3M5/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/IZI7HYGN7VZAYFV6UV3SRLYF7QGERXIU/
https://www.vicarius.io/vsociety/posts/algorithm-confusion-in-lepture-authlib-cve-2024-37568