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CVE-2026-54478: DNS Cookie bypass when combined with proxy-protocol use

lowCVSS 3.7CVE-2026-54478

CSIRTS triage

vendor: nullproduct: nullOther
What
DNS Cookie bypass can occur when combined with proxy-protocol use.
Who is affected
Systems using DNS with proxy-protocol are affected.
Urgency
Remediation is low urgency as the risk is limited.
Action
Consider reviewing proxy-protocol configurations.

AI-assisted analysis generated from the source advisory — verify against the original.

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Details

Source
Microsoft Security Response Center (INTL · vendor-psirt · site)
Severity
low — CVSS 3.7
Published
2026-07-14
Exploitation
Not in CISA KEV at last sync

Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-54478

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Referenced CVEs

CVECSIRTS overviewExternal
CVE-2026-54478coverage & exploitation statusNVD · CVE.org

Same CVEs, other sources

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