CVE & CISA-KEV Catalog

CVE-2026-40460

MEDIUM
6.5
CVSS v3
NVD

Description

When NGINX Plus or NGINX Open Source are configured to use the HTTP/3 QUIC module, an attacker may be able to spoof their source IP address allowing for bypass of authorization or bypass of rate limiting. Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.

CWE-290

How to fix

Remediation Available
nginxDebian
Fixed in:1.26.3-3+deb13u5CVE-2026-40460
Fixed in:1.30.0-4CVE-2026-40460
nginxRocky
Fixed in:main@aarch64RHSA-2026:20351
Fixed in:main@x86_64RHSA-2026:20351
Fixed in:main@noarchRHSA-2026:20351
Fixed in:main@srcRHSA-2026:20351
nginxRed Hat / RHEL
Fixed in:main@noarchRHSA-2026:20351
Fixed in:main@x86_64RHSA-2026:20351
Fixed in:main@srcRHSA-2026:20351
Fixed in:main@aarch64RHSA-2026:20351
nginxUbuntu
Fixed in:1.18.0-6ubuntu14.12USN-8354-1
Fixed in:1.24.0-2ubuntu7.9USN-8354-1
Fixed in:1.28.0-6ubuntu1.4USN-8354-1
nginx-coreUbuntu
Fixed in:1.18.0-6ubuntu14.12USN-8354-1
Fixed in:1.24.0-2ubuntu7.9USN-8354-1
Fixed in:1.28.0-6ubuntu1.4USN-8354-1
nginx-extrasUbuntu
Fixed in:1.18.0-6ubuntu14.12USN-8354-1
Fixed in:1.24.0-2ubuntu7.9USN-8354-1
Fixed in:1.28.0-6ubuntu1.4USN-8354-1
nginx-fullUbuntu
Fixed in:1.18.0-6ubuntu14.12USN-8354-1
Fixed in:1.24.0-2ubuntu7.9USN-8354-1
Fixed in:1.28.0-6ubuntu1.4USN-8354-1
nginx-lightUbuntu
Fixed in:1.18.0-6ubuntu14.12USN-8354-1
Fixed in:1.24.0-2ubuntu7.9USN-8354-1
Fixed in:1.28.0-6ubuntu1.4USN-8354-1

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork
Attack ComplexityLow
Privileges RequiredNone
User InteractionNone
ScopeUnchanged

Impact

ConfidentialityLow
IntegrityNone
AvailabilityLow

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

Exploit Intelligence

0.37%probability of exploitation in 30 days
28thpercentile

Low risk: more likely to be exploited than 28% of all known CVEs.

References

Vendor Advisory1
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CVE-2026-40460 severity badge

Markdown

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HTML

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-06-29.