THREATPORT/VULNERABILITY/CVE-2026-42530
HIGH SEVERITY

CVE-2026-42530

Nginx Gateway Fabric vulnerability

CVSS
8.1
EPSS
3.2%
EPSS pct
87th
Exploited
No known
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.
Affected vendor
F5
Affected product
Nginx Gateway Fabric
CVSS vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness type (CWE)
Published
2026-06-17

Risk analysis

Based on its CVSS vector, this vulnerability is exploitable over the network, high attack complexity, requiring no privileges, no user interaction. Successful exploitation leads to high impact to confidentiality, high impact to integrity, high impact to availability.

Its EPSS score of 3.2% reflects a lower probability of exploitation activity in the wild over the next 30 days, placing it above 87% of all scored CVEs.

Check your external exposure to CVE-2026-42530

  • Confirm whether F5 Nginx Gateway Fabric is running on any internet-facing host or subdomain.
  • Match discovered service fingerprints against the version affected by CVE-2026-42530.
  • Prioritise remediation if the asset is public, business-critical, or near authentication/payment flows.

How ThreatPort helps with CVE-2026-42530

ThreatPort's external attack surface scanner checks your internet-facing assets — agentlessly, from the outside in — for the exposed services and versions that CVE-2026-42530 affects, then prioritises the finding by real risk using CISA KEV and FIRST.org EPSS.

Run a free external exposure scan

Are you exposed to CVE-2026-42530?

Run an instant, non-intrusive external scan to check your attack surface for CVE-2026-42530.

Start free scan

No credit card. Agentless.

Related vulnerabilities

HIGH
CVE-2019-8105
Acrobat Dc vulnerability
HIGH
CVE-2019-8106
Acrobat Dc vulnerability
HIGH
CVE-2019-5032
Aspose.Cells vulnerability