CVE-2026-5194
ECDSA digest size check bypass in signature verification.
Is CVE-2026-5194 being exploited?
Not confirmed. CVE-2026-5194 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 0.45% probability of exploitation in the next 30 days.
How severe is CVE-2026-5194?
CVE-2026-5194 is rated Critical with a CVSS score of 9.3. 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-2026-5194?
Not known from our data. No patch reference has been recorded for CVE-2026-5194, 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 should I do about CVE-2026-5194?
Update crypto libraries to enforce proper digest size checks.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Attackers could bypass cert-based authentication by using too-small digests in ECDSA verification, weakening trust.
Patch when possible
- affected>= 3.12.0 and < 5.9.1
As published in the CVE Program record. A version outside these ranges is not a statement that it is unaffected — vendors sometimes understate a range, and distribution-backported builds carry upstream numbers that do not reflect what was patched into them.