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CVE-2024-53861
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CVE-2024-53861
MITRE ATT&CK
Collection
Command and Control
Credential Access
Defense Evasion
Discovery
Execution
Exfiltration
Impact
Initial Access
Lateral Movement
Persistence
Privilege Escalation
Topic Tags
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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CVE ID
AttackerKB requires a CVE ID in order to pull vulnerability data and references from the CVE list and the National Vulnerability Database. If available, please supply below: