onyx

onyx --cves cve-2026-33658

CVE-2026-33658

MEDPOCRuby on Rails
score
0.2
cvss
6.5
epss
0.4%
published
2026-03-26
kev added
—
first seen

Rails Active Storage < 8.1.2.1, 8.0.4.1, and 7.2.3.1 contains a denial of service caused by unlimited byte ranges in HTTP Range header in proxy controller, letting attackers cause high CPU usage, exploit requires crafted HTTP requests.

Timeline

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

events2026-03-26 — PublishedP2026-10-21 — Tracked by OnyxT2026-10-21 — Public PoC: https://github.com/rubysec/ruby-advisory-db/blob/master/gems/activestorage/CVE-2026-33658.ymlXscore2026-10-21: score 0.20.2epss2026-09-22: epss 0.4%2026-09-23: epss 0.4%2026-09-24: epss 0.6%2026-09-25: epss 0.6%2026-09-26: epss 0.6%2026-09-27: epss 0.6%2026-09-29: epss 0.6%2026-09-30: epss 0.6%2026-10-01: epss 0.6%2026-10-02: epss 0.6%2026-10-03: epss 0.6%2026-10-04: epss 0.6%2026-10-05: epss 0.6%2026-10-06: epss 0.6%2026-10-07: epss 0.6%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 https://github.com/rubysec/ruby-advisory-db/blob/master/gems/activestorage/CVE-2026-33658.yml

Exploit availability

Weaknesses

CWE-770

References 5