CVE•Published 2026-09-28•Modified 2026-10-06•0 articles on news•4 live references•NVD data

CVE-2026-102269Pyjwt_project · Pyjwt

Vulnerability data via NVD (ingested)

CVSS v3.1

4.8

MEDIUM

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

EPSS percentile

Exploit Prediction Scoring System · top 91% of all CVEs

Weaknesses (CWE)

CWE-180Incorrect Behavior Order: Validate Before Canonicalize

Description

PyJWT is a Python implementation of JSON Web Token standards. Prior to 2.14.0, PyJWT signature segment is affected because signature segment decoding accepts characters outside the canonical Base64URL representation. This occurs when non-Base64URL characters are appended to a valid compact JWS signature segment. As a result, base64url_decode produces the same signature bytes for different serialized segments. Consequently, raw-token revocation checks can fail to recognize an equivalent modified token. This issue is fixed in version 2.14.0.

Timeline

Published 2026-09-28

Modified 2026-10-06

External references

NVD MITRE Exploit-DB VulnCheck

Search for exposed instances

Shodan + Censys queries derived from NVD's CPE data. The vuln tag catches assets Shodan has explicitly linked to this CVE; the product / banner fingerprints find exposed instances even when the vuln tag was never applied (which is common).

Shodan · vuln tag0 hosts

vuln:CVE-2026-102269

Hosts Shodan has explicitly fingerprinted as vulnerable.

Shodan · product

product:"Pyjwt Project Pyjwt"

All exposed Pyjwt Project Pyjwt instances — cross-reference with the CVE's affected-version range.

Shodan · banner/body mention

http.html:"Pyjwt"

HTTP body or banner mentions "Pyjwt" — catches deploys Shodan didn't identify as a product.

More intel sources (5)

Shodan report

vuln:CVE-2026-102269