CVE-2026-44498
Critical: Zebra validator under-counts sigops, may cause network split.
Is CVE-2026-44498 being exploited?
Not confirmed. CVE-2026-44498 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 0.28% probability of exploitation in the next 30 days.
How severe is CVE-2026-44498?
CVE-2026-44498 is rated Critical with a CVSS score of 9.2. 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-2026-44498?
Yes. A fix has been recorded for CVE-2026-44498. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-44498 affect?
CVE-2026-44498 affects Zebra (Zcash) prior to 4.4.0. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-44498?
Upgrade to 4.4.0 or newer
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Allows a miner to publish blocks with too few sigops; Zebra accepts, zcashd rejects, risking a blockchain split.
Patch when possible
- affected< 4.4.0
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.