CVE-2026-88243 — Microsoft
CRITICALCVE-2026-88243 is a critical-severity (CVSS 9.8) Out-of-bounds Read vulnerability. The records list no fixed version yet; check the vendor advisory below and apply the mitigations in the meantime.
Out-of-bounds read in Windows DHCP Server allows an unauthorized attacker to execute code over a network.
EPSS Exploitation Probability
Probability of exploitation in the next 30 days, from FIRST.org EPSS.
How urgent is this, really
Where this sits among everything scored
Description
Out-of-bounds read in Windows DHCP Server allows an unauthorized attacker to execute code over a network.
Detection & mitigation playbook
VulnerabilityDetect
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`).
Remediation status
The records we use list no fixed release for CVE-2026-88243. Check the upstream advisory for a patched version, and apply the exposure-reduction steps below in the meantime.
Mitigate without a patch
Constrain what reaches the vulnerable code: limit the size and shape of untrusted input, isolate the affected component in a sandboxed or least-privileged process, and enable the platform's memory-safety mitigations (ASLR, stack protector, hardened allocator) so an out-of-bounds access is more likely to fail closed than to be exploitable.
Frequently Asked Questions
Is CVE-2026-88243 in your dependencies?
Find it across your dependency tree, including transitive dependencies.