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CVE-2026-53246: sctp: validate cached peer INIT chunk length in COOKIE_ECHO processing

highCVSS 7.8CVE-2026-53246

CSIRTS triage

Other
What
The vulnerability involves validating the length of a cached peer INIT chunk during COOKIE_ECHO processing.
Who is affected
Deployments using SCTP may be affected.
Urgency
Remediation is urgent due to the high severity rating of 7.8.
Action
Apply the necessary patches as they become available.

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

Details

Source
Microsoft Security Response Center (INTL · vendor-psirt · site)
Severity
high — CVSS 7.8
Published
2026-06-09
Exploitation
Not in CISA KEV at last sync

Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-53246

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-2026-53246coverage & exploitation statusNVD · CVE.org

Same CVEs, other sources

How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.

Recent advisories for sctp

A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.

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