CVE-2026-48526 — Security Box Score

CVE · referencelatest edition

Reference page — cumulative record through Wednesday, August 19, 2026 UTC. Reference pages update as the archive grows; only dated daily editions are immutable pages of record.

CVE-2026-48526HIGH

jpadilla pyjwt — PyJWT: Public-key JWK accepted as HMAC secret enables forged HS256 tokens when mixed families are allowed

  AV  AC  PR  UI  S  C  I  A   CVSS    EPSS   %ile   KEV
   N   H   N   N  U  H  H  N    7.4   .0040   32.8     —

AFFECTED
  Product  Versions    Fixed
  pyjwt    < 2.13.0 –  —

TIMELINE
  May 21  Reserved by GitHub_M
  May 28  EXPLOIT PUBLISHED — CVE-2026-48526 (jpadilla pyjwt). Public exploit reference added.
  May 28  Published (CNA: GitHub_M)
  Aug 17  EXPLOIT PUBLISHED — CVE-2026-48526 (jpadilla pyjwt). Public exploit reference added.

CWE-287, CWE-347 · CNA: GitHub_M · CVSS v3.1 · 37 references · NVD status: Modified

Description

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.

Lifecycle

Complete event history — 4 events, chronological
Date	Event	Detail
May 21, 2026	Reserved	Reserved by GitHub_M
May 28, 2026	EXPLOIT PUBLISHED	EXPLOIT PUBLISHED — CVE-2026-48526 (jpadilla pyjwt). Public exploit reference added.
May 28, 2026	Published	Published (CNA: GitHub_M)
August 17, 2026	EXPLOIT PUBLISHED	EXPLOIT PUBLISHED — CVE-2026-48526 (jpadilla pyjwt). Public exploit reference added.

Affected

Affected products and packages — 1 row
Vendor	Product / Package	Ecosystem	Version introduced	Fixed
jpadilla	pyjwt	—	< 2.13.0	—

Weaknesses

CWE-287 · CWE-347

References (37)

Authoritative record: CVE-2026-48526 at cve.org

Vendors: jpadilla

Weaknesses: CWE-287 · CWE-347

About this page

This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2026-48526 from the CVE Program record, NVD enrichment, the CISA KEV catalog, EPSS, and OSV advisories. The box score's numbers (CVSS, EPSS, KEV status) are current as of Wednesday, August 19, 2026 UTC and are re-derived as the archive grows; only dated daily editions are immutable pages of record. The authoritative source for this identifier is cve.org.