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.

Reserved 2024-11-22 | Published 2024-11-29 | Updated 2024-12-02 | Assigner GitHub_M

Problem types

CWE-697: Incorrect Comparison

Product status

= 2.10.0
affected

References

github.com/.../pyjwt/security/advisories/GHSA-75c5-xw7c-p5pm

github.com/...ommit/1570e708672aa9036bc772476beae8bfa48f4131

github.com/...ommit/33022c25525c1020869c71ce2a4109e44ae4ced1

cve.org (CVE-2024-53861)

nvd.nist.gov (CVE-2024-53861)

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