Answer in brief
CVE-2026-48526 records a High severity (CVSS 7.4) vulnerability in PyJWT: Public-key JWK accepted as HMAC secret enables forged HS256 tokens when mixed families are allowed. The current sources do not mark it as known exploited. The current feed maps jpadilla/pyjwt (generic), pyjwt (pip). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 7.4. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps jpadilla/pyjwt (generic), pyjwt (pip). Check affected ranges and fixed versions before updating.
| Product | Affected versions | Fixed versions |
|---|---|---|
| cpe:2.3:a:pyjwt_project:pyjwt:*:*:*:*:*:*:*:* | Not reported | Not reported |
| Package | Affected range | Fixed version |
|---|---|---|
| jpadilla/pyjwtgeneric | < 2.13.0 | Not reported |
| pyjwtpip | <2.13.0 | 2.13.0 |
Published upstream
May 28, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Sep 10, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Jun 19, 2026
PyJWT is a JSON Web Token implementation in Python. Prior to 2.13.0, when the verifier is decoding JSON Web Tokens, while supporting both asymmetric and HMAC algorithms, the library does not validate use of JSON Web Keys in HMAC algorithm, allowing attacker to use the issuer public key as the secret key for HMAC algorithm. This vulnerability is fixed in 2.13.0.
Quoted source text, attributed separately from HOL analysis.