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CRITICAL severity

CVE-2026-83935 — Microsoft

CRITICAL

CVE-2026-83935 is a critical-severity (CVSS 9.8) CWE-122 vulnerability. No vendor fix is recorded yet; mitigation options are listed below.

Heap-based buffer overflow in Microsoft XML allows an unauthorized attacker to execute code over a network.

Published
Updated
Affected
—
Patched
—
Exploits
None indexed
Exploitation data as of Oct 13, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

Description

Heap-based buffer overflow in Microsoft XML allows an unauthorized attacker to execute code over a network.

Detection & mitigation playbook

Vulnerability

  1. Detect

    Identify every host running the affected component and compare the installed build against the fixed version below — for source-built or distro-packaged software the version string, not a lockfile, is the source of truth (`dpkg -l`, `rpm -q`, or the binary's own `--version`).

  2. Remediation status

    No fixed release is recorded for CVE-2026-83935 yet. Track the upstream advisory, and apply the exposure-reduction steps below in the meantime.

  3. Mitigate without a patch

    Stop feeding it untrusted input: reject or quarantine files and payloads from unverified sources until you can upgrade, restrict accepted formats to the ones you actually need, and run the parsing or decoding step in a least-privileged sandbox or short-lived worker so a crash or corrupted read cannot reach the rest of the process.

Frequently Asked Questions

Heap-based buffer overflow in Microsoft XML allows an unauthorized attacker to execute code over a network.
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CVE-2026-83935: Microsoft (Critical 9.8)