Signal is active with 1 mentions in latest observed window
Recommended action window: Monitor and triage in normal cycle
NVD 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.
Priority
LOW
Exploitation
NONE
PoC
YES
Patch
NONE
Momentum
NONE
If you run products in this scope, you should treat this CVE as relevant to your environment.
🟠 PyJWT, Unauthenticated Denial of Service (DoS), #CVE-2026-48525 (Medium) -DC-Jun2026-427 https://dailycve.com/pyjwt-unauthenticated-denial-of-service-dos-cve-2026-48525-medium-dc-jun2026-427/
Post summary
The post announces the CVE-2026-48525 vulnerability in PyJWT, indicating an unauthenticated DoS with a Medium CVSS score, but offers no PoC, exploit code, or mitigation details.
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| Part | Vendor | Product | Version | Target SW | Target HW |
|---|---|---|---|---|---|
| App | pyjwt_project | pyjwt | - | - | - |