What is CVE-2025-53864?

CVE-2025-53864 is a medium-severity vulnerability in Connect2id Nimbus Jose+jwt, classified under Uncontrolled Recursion. CVSS score: 5.8/10. Published 2025-07-11.

How severe is CVE-2025-53864?

Medium severity. CVSS v3 base score is 5.8 out of 10.

Is CVE-2025-53864 known to be exploited?

1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Vulnerability in Connect2id Nimbus Jose+jwt

CVE-2025-53864

Connect2id Nimbus JOSE + JWT 10.0.x before 10.0.2 and 9.37.x before 9.37.4 allows a remote attacker to cause a denial of service via a deeply nested JSON object supplied in a JWT claim set, because of uncontrolled recursion. NOTE: this is…

EPSS: 0.008 (52.2th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 5.8 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:L.

Affected products

Connect2id Nimbus Jose+jwt — versions 0

Weakness classification (CWE)

CWE-674 — Uncontrolled Recursion

Public proof-of-concept exploits

th2-net/th2-bom

References

Frequently asked questions

What is CVE-2025-53864?: CVE-2025-53864 is a medium-severity vulnerability in Connect2id Nimbus Jose+jwt, classified under Uncontrolled Recursion. CVSS score: 5.8/10. Published 2025-07-11.
How severe is CVE-2025-53864?: Medium severity. CVSS v3 base score is 5.8 out of 10.
Is CVE-2025-53864 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.