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Low severityNVD Advisory· Published Nov 29, 2024· Updated Dec 2, 2024

Issuer field partial matches allowed in pyjwt

CVE-2024-53861

Description

pyjwt is a JSON Web Token implementation in Python. An incorrect string comparison is run for iss checking, resulting in "acb" being accepted for "_abc_". This is a bug introduced in version 2.10.0: checking the "iss" claim changed from isinstance(issuer, list) to isinstance(issuer, Sequence). Since str is a Sequnce, but not a list, in is also used for string comparison. This results in if "abc" not in "__abcd__": being checked instead of if "abc" != "__abc__":. Signature checks are still present so real world impact is likely limited to denial of service scenarios. This issue has been patched in version 2.10.1. All users are advised to upgrade. There are no known workarounds for this vulnerability.

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Affected packages

Versions sourced from the GitHub Security Advisory.

PackageAffected versionsPatched versions
PyJWTPyPI
>= 2.10.0, < 2.10.12.10.1

Affected products

26

Patches

Vulnerability mechanics

References

5

News mentions

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