OpenSSH is widely deployed; this is a remote code execution in OpenSSH for Windows allowing network-based full compromise, likely to impact many organizations.
CVE-2026-88157
Heap overflow in OpenSSH for Windows enables remote code execution.
WAF coverage: Heap-based buffer overflow.
Also consider: patch
Is CVE-2026-88157 being exploited?
Not confirmed. CVE-2026-88157 does not appear in CISA's Known Exploited Vulnerabilities catalog, which records only exploitation that has been observed and reported publicly. That is evidence of absence of a report, not evidence the flaw is unattacked. EPSS currently estimates a 0.53% probability of exploitation in the next 30 days.
How severe is CVE-2026-88157?
CVE-2026-88157 is rated High with a CVSS score of 8.8. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.
Is there a patch for CVE-2026-88157?
Yes. A fix has been recorded for CVE-2026-88157. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-88157 affect?
CVE-2026-88157 affects OpenSSH for Windows, Windows servers running OpenSSH, Windows hosts with OpenSSH server enabled. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-88157?
Apply vendor update immediately; restrict SSH exposure, rotate keys, and monitor SSH logs.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Remote code execution via heap overflow in OpenSSH for Windows; attacker can run arbitrary code as the SSH service user, enabling full system compromise.
Immediate action required