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NVD / CVE Program· CNA f5

CVE-2026-90439: NGINX ngx_http_v3_module vulnerability

Noroxi assessment

Priority: Monitor (action score 27/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.25% (FIRST EPSS).
  • Anyone who can reach it over the internet can trigger it. No account or password is required. No user action is required. No special conditions are required; it is repeatable.
  • According to CISA the attack is automatable: targets can be found by mass scanning.
  • Fixed version: F5 NGINX Open Source 1.30.5, 1.31.6.

Low priority for now. Upgrade to F5 NGINX Open Source 1.30.5, 1.31.6 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

NGINX Plus and NGINX Open Source have a vulnerability in the ngx_http_v3_module module. When using HTTP/3 with OpenSSL versions <= OpenSSL 3.5.0 under certain configurations, a limited heap buffer overflow could happen while processing a TLS handshake. This can happen in a non-deterministic manner that is beyond the attacker's control. This may cause a heap buffer overflow in the NGINX worker process leading to a restart and/or limited data corruption. Impact: This vulnerability may allow remote attackers to cause a denial-of-service (DoS) on the NGINX system or limited data corruption. There is no control plane exposure; this is a data plane issue only. Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.

MediumCVSS 6.9 · v4.0—No exploit Fix available
Published
Sep 15, 2026
Updated
Sep 18, 2026
EPSS
0.2% · 17th percentile

Report tools

JSON

Action score

27

Monitor

Low priority for now.

CVSS
27 / 40 · 6.9 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.2%

CISA SSVC decision

Exploitation
none
Automatable
yes
Technical impact
partial

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
—
CNA · f5
6.5
NVD has not scored this yet; the score shown is the CNA’s.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

If any of these changes, we'll tell you in the daily email digest.

Follow CVE-2026-90439

When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

—

Using nginx plus? Add it to your stack and be the first to know about CVEs like this one. (Nginx)

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When you'll hear from us

  • when a new CVE affecting this product is published
  • when a record in your stack enters KEV or gets exploit code

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Running WordPress? Scan your site free with WP Lens

  • Stack alerts: add the products and versions you run, get the new CVEs that affect them
  • Uptime monitoring: 1 site, instant email when it goes down
  • Add your domain: subdomains and takeover risk scanned every week (1 domain)
  • 10 scans an hour on the security tools (3 a day without an account), an API key and MCP
  • All your scans in one panel: findings, what changed in the last scan, a report per domain or per client (PDF, share link)
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Versions reported by the vendor

Affected version ranges reported by the assigning authority (f5). Independent of NVD's CPE analysis and usually ahead of it.

  • F5 NGINX Open Source

    • 1.29.2 and later · before 1.31.6affected · semver
    • 1.30.4 and later · before 1.30.5affected · semver

  • F5 NGINX Plus

    • 37.1.0.1 and later · before 37.1.1.2affected
    • 37.0.0.1 and later · before 37.0.6.2affected

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Alpine:v3.24nginxbefore 1.30.6-r01.30.6-r0
Debian:14nginxbefore 1.30.4-71.30.4-7
openSUSE:Tumbleweednginxbefore 1.31.6-1.11.31.6-1.1
Red Hat:hummingbird:1nginxbefore 0:1.30.5-4.hum10:1.30.5-4.hum1
Red Hat:hummingbird:1nginx-all-modulesbefore 0:1.30.5-4.hum10:1.30.5-4.hum1
Red Hat:hummingbird:1nginx-corebefore 0:1.30.5-4.hum10:1.30.5-4.hum1
Red Hat:hummingbird:1nginx-filesystembefore 0:1.30.5-4.hum10:1.30.5-4.hum1
Red Hat:hummingbird:1nginx-mod-develbefore 0:1.30.5-4.hum10:1.30.5-4.hum1
Red Hat:hummingbird:1nginx-mod-http-geoipbefore 0:1.30.5-4.hum10:1.30.5-4.hum1
Red Hat:hummingbird:1nginx-mod-http-image-filterbefore 0:1.30.5-4.hum10:1.30.5-4.hum1
Red Hat:hummingbird:1nginx-mod-http-perlbefore 0:1.30.5-4.hum10:1.30.5-4.hum1
Red Hat:hummingbird:1nginx-mod-http-xslt-filterbefore 0:1.30.5-4.hum10:1.30.5-4.hum1
Red Hat:hummingbird:1nginx-mod-mailbefore 0:1.30.5-4.hum10:1.30.5-4.hum1
Red Hat:hummingbird:1nginx-mod-streambefore 0:1.30.5-4.hum10:1.30.5-4.hum1
Red Hat:hummingbird:1nginx-mod-stream-geoipbefore 0:1.30.5-4.hum10:1.30.5-4.hum1

Same product

f5: all records

Other highest-scoring records for the same primary product.

Published before and after this one in the same product

  • ← EarlierCVE-2026-28755Mar 24, 2026 · NGINX ngx_stream_ssl_module vulnerability
    21Monitor
  • ← EarlierCVE-2026-32647Mar 24, 2026 · NGINX ngx_http_mp4_module vulnerability
    34Monitor
  • Later →CVE-2026-15176Oct 14, 2026 · NGINX ngx_http_core_module vulnerability
    36Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
F5 NGINX Open Source1.30.5Vendor (CNA)
F5 NGINX Open Source1.31.6Vendor (CNA)
alpine:nginx1.30.6-r0 · Alpine:v3.24Package registry (OSV)
debian:nginx1.30.4-7 · Debian:14Package registry (OSV)
opensuse:nginx1.31.6-1.1 · openSUSE:TumbleweedPackage registry (OSV)
red hat:nginx0:1.30.5-4.hum1 · Red Hat:hummingbird:1Package registry (OSV)
red hat:nginx-all-modules0:1.30.5-4.hum1 · Red Hat:hummingbird:1Package registry (OSV)
red hat:nginx-core0:1.30.5-4.hum1 · Red Hat:hummingbird:1Package registry (OSV)
red hat:nginx-filesystem0:1.30.5-4.hum1 · Red Hat:hummingbird:1Package registry (OSV)
red hat:nginx-mod-devel0:1.30.5-4.hum1 · Red Hat:hummingbird:1Package registry (OSV)
red hat:nginx-mod-http-geoip0:1.30.5-4.hum1 · Red Hat:hummingbird:1Package registry (OSV)
red hat:nginx-mod-http-image-filter0:1.30.5-4.hum1 · Red Hat:hummingbird:1Package registry (OSV)
red hat:nginx-mod-http-perl0:1.30.5-4.hum1 · Red Hat:hummingbird:1Package registry (OSV)
red hat:nginx-mod-http-xslt-filter0:1.30.5-4.hum1 · Red Hat:hummingbird:1Package registry (OSV)
red hat:nginx-mod-mail0:1.30.5-4.hum1 · Red Hat:hummingbird:1Package registry (OSV)
red hat:nginx-mod-stream0:1.30.5-4.hum1 · Red Hat:hummingbird:1Package registry (OSV)
red hat:nginx-mod-stream-geoip0:1.30.5-4.hum1 · Red Hat:hummingbird:1Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

  • CVE-2026-27654175 days apartNGINX ngx_http_dav_module vulnerability
    43Plan
  • CVE-2026-1517629 days apartNGINX ngx_http_core_module vulnerability
    36Monitor
  • CVE-2026-9347929 days apartNGINX map directive and regex matching vulnerability
    36Monitor

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

  • Anyone who can reach it over the internet can trigger it.
  • No account or password is required.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
Integrity
Availability
Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
X

Weakness class (CWE)

CWE-122 · Heap-based Buffer Overflow

CVSS vector

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

nvd-secondary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

ATT&CK techniques

—

Change log

  1. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records