Is there a public exploit for CVE-2026-48524?

No public exploit for CVE-2026-48524 was found in Exploit-DB, Metasploit, Nuclei templates or public proof-of-concept repositories. That is an absence of evidence rather than proof that none exists.

How severe is CVE-2026-48524?

CVE-2026-48524 scores CVSS 3.7 (v3.1), rated low. EPSS puts the chance of exploitation in the next 30 days at 0.4%.

What does CVE-2026-48524 affect?

CVE-2026-48524 affects jpadilla pyjwt.

3.7 Low

PyJWT is a JSON Web Token implementation in Python.

CVE-2026-48524

[!NOTE] The vulnerability surfaces only when a JWKS fetch fails; an attacker can attempt to provoke that with sustained unknown-kid traffic, but the outcome depends on upstream JWKS-endpoint behavior (rate limiting, transient errors) which is beyond the attacker's control. Impact is reduced auth availability until the next successful fetch, not complete denial of service. Summary PyJWKClient.getsigningkey() forces a fresh HTTP request to the JWKS endpoint for every JWT with an unknown kid value, with no rate limiting. Since kid comes from the unverified token header, an attacker can trigger unlimited outbound requests. Additionally, fetchdata() finally block clears the JWKS cache on network error. Root Cause jwt/jwksclient.py:172-198 - getsigningkey(kid) calls getsigningkeys(refresh=True) for unknown kids, bypassing TTL cache with no cooldown. jwt/jwksclient.py:120-122 - finally block writes None to cache on error, clearing valid data. Impact DoS against JWKS endpoint (unlimited requests per invalid token) DoS against application (network I/O latency) Cascading failure (rate limiting clears cache, breaking legitimate auth) Suggested Fix 1. Add refresh cooldown (refuse refresh more…

Assessment

CVSS: 3.7 (v3.1)
Severity: Low
EPSS: 0.4% chance of exploitation in the next 30 days
Known exploited: Not listed in CISA KEV
Exploit availability: Nothing found in Exploit-DB, Metasploit, Nuclei or public PoC repositories
Published: 28 May 2026
Last updated: 26 October 2026
Affected: jpadilla · pyjwt · pyjwt
Weakness: CWE-460, CWE-755
Assigner: security-advisories@github.com

CVSS vectorCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L

At the source

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