onyx

onyx --cves cve-2026-47221

CVE-2026-47221

MEDPOCEnvoy Proxy
score
1.7
cvss
5.9
epss
0.4%
published
2026-06-26
kev added
—
first seen

Envoy 1.18.0 to 1.35.13, 1.36.9, 1.37.5, and 1.38.3 contains a null pointer dereference vulnerability in the router filter when handling HTTP 303 internal redirects for body-less non-GET/HEAD requests, letting unauthenticated attackers cause denial of service by crashing the process, exploit requires specific internal redirect policy and upstream 303 response.

Timeline

How this CVE moved toward exploitation. Chart: last 30 days — trend score, EPSS, community mentions per day; hover the event lane.

events2026-06-26 — PublishedP2026-10-21 — Tracked by OnyxT2026-10-21 — Public PoCXscore2026-10-21: score 1.71.7epss2026-09-22: epss 0.4%2026-09-23: epss 0.4%2026-09-24: epss 0.4%2026-09-25: epss 0.4%2026-09-26: epss 0.4%2026-09-27: epss 0.4%2026-09-29: epss 0.4%2026-09-30: epss 0.4%2026-10-01: epss 0.4%2026-10-02: epss 0.4%2026-10-03: epss 0.4%2026-10-04: epss 0.4%2026-10-05: epss 0.4%2026-10-06: epss 0.4%2026-10-07: epss 0.4%2026-10-08: epss 0.4%2026-10-09: epss 0.4%2026-10-10: epss 0.4%2026-10-11: epss 0.4%2026-10-12: epss 0.4%2026-10-13: epss 0.4%2026-10-14: epss 0.4%2026-10-15: epss 0.4%2026-10-16: epss 0.4%2026-10-18: epss 0.4%2026-10-19: epss 0.4%2026-10-20: epss 0.4%2026-10-21: epss 0.4%0.4%mentions/day0no mentions in 30 days2026-09-22today
  1. Published
  2. Tracked by Onyx
  3. Public PoC

Exploit availability

Public PoC flagged by vulnx; no direct exploit link among the citations.

Weaknesses

CWE-476

References 1