F5 NGINX Open Source patches DoS flaw
CERT-FR advisory details a NGINX Open Source vulnerability allowing remote denial of service and data integrity compromise, fixed in versions 1.31.6 and 1.30.5.
Sourcecert.ssi.gouv.fr — open the original
What to check
- Applies to
- The 1 CVE named below. Whether you run an affected version is not assessed: check the versions the source lists.
- Exploitation
- No exploitation in the wild and no public exploit is recorded for the CVEs named.
CERT-FR published an advisory on September 2026 covering a vulnerability in F5's NGINX Open Source software, tracked as CVE-2026-90439. The flaw affects NGINX Open Source versions 1.31.x prior to 1.31.6, as well as versions up to 1.30.5, and allows a remote attacker to trigger a denial-of-service condition and compromise the integrity of data. The advisory does not indicate that the vulnerability is currently being exploited in the wild.
Defenders running affected NGINX Open Source deployments should consult F5's security bulletin (K000162604, published 15 September 2026) and apply the vendor's patches promptly. No proof-of-concept or exploitation details are included in this advisory; organizations should prioritize patching based on their exposure of internet-facing NGINX instances and internal risk assessment.
Mentioned in this report
Source reporting: https://www.cert.ssi.gouv.fr/avis/CERTFR-2026-AVI-1182
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