onyx

onyx --cves cve-2025-6491

CVE-2025-6491

MEDPOCPHP
score
<0.1
cvss
5.9
epss
1.0%
published
2025-07-13
kev added
—
first seen

PHP 8.1.* < 8.1.33, 8.2.* < 8.2.29, 8.3.* < 8.3.23, and 8.4.* < 8.4.10 contain a null pointer dereference caused by parsing overly large XML namespace prefixes in SOAP extensions, letting attackers cause server crashes and denial of service, exploit requires sending large XML data.

Timeline

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

events2025-07-13 — PublishedP2026-10-21 — Tracked by OnyxT2026-10-21 — Public PoCXscore2026-10-21: score <0.1<0.1epss2026-09-22: epss 1.0%2026-09-23: epss 1.0%2026-09-24: epss 1.0%2026-09-25: epss 1.0%2026-09-26: epss 1.0%2026-09-27: epss 1.0%2026-09-29: epss 1.0%2026-09-30: epss 1.0%2026-10-01: epss 1.0%2026-10-02: epss 1.0%2026-10-03: epss 1.0%2026-10-04: epss 1.0%2026-10-05: epss 1.0%2026-10-06: epss 1.0%2026-10-07: epss 1.0%2026-10-08: epss 1.0%2026-10-09: epss 1.0%2026-10-10: epss 1.0%2026-10-11: epss 1.0%2026-10-12: epss 1.0%2026-10-13: epss 1.0%2026-10-14: epss 1.0%2026-10-15: epss 1.0%2026-10-16: epss 1.0%2026-10-18: epss 1.0%2026-10-19: epss 1.0%2026-10-20: epss 1.0%2026-10-21: epss 1.0%1.0%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 3