CVE-2026-32665: Remote DNS-over-QUIC denial of service due to `quic-size` budget bypass
CSIRTS triage
- What
- A denial of service vulnerability exists due to a `quic-size` budget bypass in DNS-over-QUIC.
- Who is affected
- Deployments using DNS-over-QUIC are affected.
- Urgency
- Remediation is urgent due to the high 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
Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-32665
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-2026-326650.29% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 21% of all scored CVEs.
Referenced CVEs
| CVE | CSIRTS overview | External |
|---|---|---|
| CVE-2026-32665 | coverage & exploitation status | NVD · CVE.org |
Same CVEs, other sources
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