---
cve: "CVE-2026-42530"
severity: "CRITICAL"
cvss: 9.2
epss: "3.7%"
vendor: "F5"
kev: false
exploited: false
published: "2026-06-17 15:16:50"
tags: [cve, security, critical]
source: tsecurity.de CVE-Dossier
exported: "2026-09-05T17:53:12+02:00"
---

# CVE-2026-42530

> 9.2 CRITICAL

## Beschreibung

NGINX Open Source has a vulnerability in the ngx_http_v3_module module. When NGINX Open Source is configured to use the HTTP/3 QUIC module, a remote unauthenticated attacker along with conditions beyond their control can use a specially crafted HTTP/3 session to reopen a QPACK encoder stream. This may cause a Use-after-Free in the NGINX worker process leading to a restart. Additionally, attackers can execute code on systems with Address Space Layout Randomization (ASLR) disabled or when the attacker can bypass ASLR.  


Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.

## CVSS-Vektor

```
CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
```

| Metrik | Wert | Bewertung |
|---|---|---|
| AV Angriffsvektor | Netzwerk | bad |
| AC Komplexität | Hoch | good |
| PR Privilegien | Keine | bad |
| UI Interaktion | Keine | bad |

## Patch verfügbar (OSV)

- 2fd01ed47a1fd2965754c83f53b33a789d0e07f1 (Commit)
- 66691213cd771fe56b124786ea6701c7fb8e467a (Commit)

## Referenzen

- <https://my.f5.com/manage/s/article/K000161616>
- <https://access.redhat.com/errata/RHSA-2026:20351>
- <https://access.redhat.com/security/cve/CVE-2026-42530>
- <https://bugzilla.redhat.com/show_bug.cgi?id=2489872>
- <https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-42530.json>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-42530) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_