CVE-2026-50046: Possible heap use-after-free in an error path when a DoT forwarded query is jostled out

CSIRTS triage

What

A possible heap use-after-free vulnerability exists in an error path for DoT forwarded queries.

Who is affected

Deployments using DoT are affected by this vulnerability.

Urgency

Remediation is medium priority due to the medium severity of the vulnerability.

Action

Apply patches or mitigations as soon as they are available.

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

Details

Source

Microsoft Security Response Center (INTL · vendor-psirt · site)

Severity

medium — CVSS 5.9

Published

2026-07-14

Exploitation

Not in CISA KEV at last sync

Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-50046

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.

• Low exploitation riskCVE-2026-500460.24% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 15% of all scored CVEs.

Referenced CVEs

Same CVEs, other sources

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

• medium[NEW] [medium] Unbound: Multiple vulnerabilitiescert-bund
• mediumCVE-2026-50046: In NLnet Labs Unbound 1.15.0 up to and including 1.25.1, the TLS server name used for DNS-over…nvd

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