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CVE-2026-34180: Heap Buffer Over-read in ASN.1 Content Parsing

highCVSS 7.5CVE-2026-34180

CSIRTS triage

vendor: nullproduct: nullOther
What
A heap buffer over-read can occur in ASN.1 content parsing.
Who is affected
Systems that parse ASN.1 content.
Urgency
Remediation is urgent due to the high severity and potential for information leakage.
Action
Patch the ASN.1 parsing implementation to prevent buffer over-reads.

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
high — CVSS 7.5
Published
2026-08-06
Exploitation
Not in CISA KEV at last sync

Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-34180

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-2026-34180coverage & exploitation statusNVD · CVE.org

Same CVEs, other sources

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

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