CVEvulnerability

CVE-2024-53861

7.5 HIGH Published 2024-11-29 Modified 2026-06-17 Official page ↗
Status
Analyzed
Published
2024-11-29
Last modified
2026-06-17
Assigner
[email protected]
CVSS 3.1 ([email protected])
2.2 LOW — CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:N/I:L/A:N
CVSS 3.1 ([email protected])
7.5 HIGH — CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weaknesses
CWE-697

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.

Affected configurations

• pyjwt project pyjwt 2.10.0

Related

Weakness · CWE (1)

  • CWE-697 Incorrect Comparison weakness

References