CVE-2026-57826
openHiTLS X.509 CA checks ignore v1/v2 intermediates, enabling forged CA certs.
Is CVE-2026-57826 being exploited?
Not confirmed. CVE-2026-57826 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 0.21% probability of exploitation in the next 30 days.
How severe is CVE-2026-57826?
CVE-2026-57826 is rated Critical with a CVSS score of 9.8. 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-2026-57826?
Not known from our data. No patch reference has been recorded for CVE-2026-57826, which is not the same as no patch existing — a fix may have shipped without a tagged reference, or after this record was written. The vendor advisory is the only authority on whether a fix exists, and mitigations may be available regardless.
What does CVE-2026-57826 affect?
CVE-2026-57826 affects openHiTLS 0.2.0 - 0.3.2, Applications and devices embedding vulnerable openHiTLS builds. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-57826?
Audit for openHiTLS, isolate vulnerable builds, apply vendor patch when released, monitor TLS certificates.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Certificate chain validation bypass: attacker can use v1/v2 intermediate as CA to issue trusted certs, enabling MITM and impersonation.
Immediate action required