CVE-2026-10512: X25519 x86_64 assembly final reduction leaves non-canonical field element

highCVSS 7.5CVE-2026-10512

CSIRTS triage

vendor: null product: nullOther

What: The X25519 x86_64 assembly final reduction leaves a non-canonical field element.
Who is affected: Deployments using affected implementations of X25519.
Urgency: Remediation is high urgency due to the high severity of the issue.
Action: Update to a patched version for CVE-2026-10512.

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

⚡ Watch null

Get an email when a new null advisory drops — max one per day, one-click unsubscribe.

Details

Source: Microsoft Security Response Center (INTL · vendor-psirt · site)
Severity: high — CVSS 7.5
Published: 2026-06-09
Exploitation: Not in CISA KEV at last sync

Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-10512

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-2026-105120.26% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 18% of all scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2026-10512	coverage & exploitation status	NVD · CVE.org

Same CVEs, other sources

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

highCVE-2026-10512: The X25519 x86_64 assembly implementation fails to clear the most significant bit during the f…nvd

Recent advisories for X25519 x86_64 assembly

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.

highCVE-2026-10512: The X25519 x86_64 assembly implementation fails to clear the most significant bit during the f…nvd · 2026-06-25