Is CVE-2026-48525 actively exploited?

No active exploitation of CVE-2026-48525 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2026-48525 be exploited remotely?

Yes. CVE-2026-48525 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2026-48525?

CVE-2026-48525 has a CVSS score of 5.3 (MEDIUM).

HOME VULNERABILITIESCVE-2026-48525

MEDIUM

CVE-2026-48525

CWE-400Published: May 28, 2026· Updated: Jun 1, 2026

5.3

CVSS v3.1

EPSS:0.04%probability of exploitation in 30 daysPercentile:12.0th

Official Description

PyJWT is a JSON Web Token implementation in Python. From 2.8.0 to 2.12.1, when verifying detached JWS tokens using the unencoded-payload option ("b64": false, RFC 7797), PyJWT performs Base64URL decoding of the compact-serialization payload segment before enforcing the detached-payload rules. For b64=false, PyJWT later discards that decoded payload and replaces it with the caller-provided detached_payload. In practice, this turns the middle segment into an attacker-controlled “work amplifier”: a remote client can supply an arbitrarily large Base64URL payload segment that forces CPU work + memory allocations even if the signature is invalid. This creates an unauthenticated DoS vector against any endpoint that verifies detached JWS using PyJWT. This vulnerability is fixed in 2.13.0.

NVD Source

Technical Analysis

CVE-2026-48525 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.