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CVE-2026-34183: Unbounded Memory Growth in the QUIC PATH_CHALLENGE Handler

highCVSS 7.5CVE-2026-34183

CSIRTS triage

vendor: nullproduct: nullOther
What
There is unbounded memory growth in the QUIC PATH_CHALLENGE handler.
Who is affected
Deployments using the QUIC protocol are affected by this issue.
Urgency
This vulnerability has a high severity with a CVSS score of 7.5, necessitating prompt action.
Action
Implement memory management best practices or update to a fixed version.

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-2026-34183

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-2026-34183coverage & exploitation statusNVD · CVE.org

Same CVEs, other sources

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

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