CVE-2026-42764: NULL Pointer Dereference in QUIC Server Initial Packet Handling

highCVSS 7.5CVE-2026-42764

CSIRTS triage

Other

What: This vulnerability is a NULL Pointer Dereference in QUIC Server Initial Packet Handling.
Who is affected: Deployments using QUIC are affected by this vulnerability.
Urgency: Remediation is urgent due to a high severity rating.
Action: Implement necessary updates to address this vulnerability.

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 7.5
Published: 2026-08-06
Exploitation: Not in CISA KEV at last sync

Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-42764

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.

Moderate exploitation riskCVE-2026-427641.2% 30-day exploitation probability. Patch within normal cadence, watch for KEV listing. Riskier than 65% of all EPSS-scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2026-42764	coverage & exploitation status	NVD · CVE.org

Same CVEs, other sources

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

high[UPDATE] [high] OpenSSL: Multiple Vulnerabilitiescert-bund
high[NEW] [high] IBM App Connect Enterprise: Multiple vulnerabilitiescert-bund
unknownNCSC-2026-0307 [1.00] [M/H] Vulnerabilities resolved in Oracle Database Productsncsc-nl
unknownMultiple vulnerabilities in Oracle Database Server (July 23, 2026)cert-fr-avis

Recent advisories for NULL Pointer Dereference

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.

unknownCVE-2026-65367: A null pointer dereference was addressed with improved input validation. This issue is fixed i…nvd · 2026-08-25
mediumCVE-2026-48429: Substance3D - Designer is affected by a NULL Pointer Dereference vulnerability that could resu…nvd · 2026-08-25
highCVE-2026-24263: NVIDIA DGX Spark contains a vulnerability in the system firmware, where a privileged attacker …nvd · 2026-08-25
highCVE-2023-54354: Nokogiri before 1.14.3 (CRuby implementation only, when using the packaged libxml2) bundles li…nvd · 2026-08-25
highCVE-2026-71922: Multiple DrayTek VigorSwitch models contain a pre-authentication null pointer dereference vuln…nvd · 2026-08-24
mediumCVE-2026-71920: Multiple DrayTek VigorSwitch models contain a null pointer dereference vulnerability in the fo…nvd · 2026-08-24