Skip to content
skopnix
Dossier · Vulnerability

Vulnerability

CVE-2026-42533

Signals

Exploited in the wild
Not on KEVNot in CISA's catalogue as of the last daily pull. Absence is not proof of safety.
EPSS · 30-day forecast
1%Chance of exploitation in the next 30 days, 59th percentile of all CVEs. A forecast; KEV outranks it.
CVSS · NVD
not stated by sourcesNo NVD record yet.
Internet exposure
not stated by sourcesNo exposure census on this CVE's dispatches.

Exploits

12 known · links only

GitHub PoCs · by trust, then stars12

  1. imbas007/CVE-2026-42533 ↗Trust ok 100

    nginx heap buffer overflow PoC — CVE-2026-42533 pre-auth RCE via two-pass capture clobbering. Crash confirmed on Ubuntu 24.04.

    ★ 35 · created 2026-07-27

  2. 0xCyberstan/CVE-2026-42533-Config-Scanner ↗Trust ok 100

    Static config scanner that flags nginx configs vulnerable to the complex_value two-pass capture-clobbering bug (regex map + regex capture → heap overflow / info leak).

    ★ 31 · created 2026-07-04

  3. 0xCyberstan/CVE-2026-42533-POC ↗Trust ok 100

    CVE-2026-42533: pre-auth nginx heap overflow and info leak from PCRE capture clobbering in the map/script engine, chained to RCE.

    ★ 1 · created 2026-08-05

  4. Daniyal48/ghostlock-vagrant-box ↗Trust ok 100

    An isolated Vagrant testbed designed to simulate a complete attack chain: Initial access via the Nginx heap buffer overflow (CVE-2026-42533) followed by root privilege escalation using the Ghostlock kernel vulnerability (CVE-2026-43449).

    ★ 1 · created 2026-07-20

  5. seguridadentrerios/CVE-2026-42533 ↗Trust ok 100

    Vulnerabilidad en NGINX

    ★ 1 · created 2026-07-22

  6. FranklinF25/cve-2026-42533 ↗Trust ok 100

    ★ 0 · created 2026-08-29

  7. gagaltotal/CVE-2026-42533-nginx ↗Trust ok 100

    CVE-2026-42533 Nginx

    ★ 0 · created 2026-07-23

  8. ivanesk315/CVE-2026-42533 ↗Trust ok 100

    ★ 0 · created 2026-09-10

  9. jelasin/CVE-2026-42533 ↗Trust ok 100

    ★ 0 · created 2026-07-27

  10. Leeyoonjoo/CVE-2026-42533 ↗Trust ok 100

    ★ 0 · created 2026-08-12

  11. srkyn/nginx-map-risk-audit ↗Trust ok 100

    Defensive NGINX CVE-2026-42533 map regex risk audit with config scanner, Splunk/Defender notes, and lab evidence.

    ★ 0 · created 2026-07-20

  12. suominen/CVE-2026-42533 ↗Trust ok 100

    Tracking the nginx CVE-2026-42533 map/regex capture-clobbering heap overflow

    ★ 0 · created 2026-07-21

Fake proof-of-concept repositories have been used to deliver malware to the researchers who run them. The trust verdict is our engine's heuristic over the repository (account age, what it ships, how its stars arrived); it is a reason to read the code first, not a finding about its author.

On the wire

1 dispatch
  1. UPDATE - Public PoC exploit released for CVE-2026-42533, chaining an #nginx memory leak and heap overflow to bypass ASLR and achieve unauthenticated command execution. Read: https://thehackernews.com/2026/07/critical-nginx-vulnerability-can-crash.htmlEXPL

Watch this one?

KEV additions reach Telegram and the KEV-only RSS as they land.

Follow on TelegramKEV RSSAPI

Check your stack

Paste what you run: the CVEs exploited in the wild against it, and who is cited as exploiting them, with the report.

Stack checkNo key. No signup.