CVE-2024-53861
LOWDescription
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.
How to fix
No published remediation has been found for this vulnerability's affected products yet.
Mitigation guidance may be in the linked vendor advisories in the References section below.
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CVSS v3 Vector
Exploitability
Impact
CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:N/I:L/A:N
Exploit Intelligence
Moderate risk: more likely to be exploited than 54% of all known CVEs.
References
Related Vulnerabilities
Other CWE-697 vulnerabilities, ordered by exploit likelihood. View all
| CVE | Severity | CVSS | EPSS | Exploited | Fix |
|---|---|---|---|---|---|
| CVE-2024-5217 | Critical | 9.8 | 100% | KEV | - |
| CVE-2020-5849 | High | 7.5 | 93% | KEV | - |
| CVE-2020-8864 | High | 8.8 | 80% | - | - |
| CVE-2025-3102 | High | 8.1 | 76% | - | - |
| CVE-2023-32571 | Critical | 9.8 | 35% | - | - |
| CVE-2020-8862 | High | 8.8 | 13% | - | - |
Common questions
How do I fix CVE-2024-53861?
No published fix for CVE-2024-53861 has been found yet. Check the linked vendor advisories for guidance as it becomes available.
Is CVE-2024-53861 being actively exploited?
Not that we know of. CVE-2024-53861 is not in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score of 0.81% is the estimated probability that it will be exploited in the next 30 days. That is higher than 54% of all scored CVEs.
How severe is CVE-2024-53861?
CVE-2024-53861 has a CVSS v3 base score of 2.2, rated low. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.
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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2025-09-22.