HIGH 8.7 NVD
CVE-2026-104431
Zebra before 6.0.0 contains a denial of service vulnerability that allows unauthenticated peers to stall Tokio workers by submitting mempool transactions requir
Zebra before 6.0.0 contains a denial of service vulnerability that allows unauthenticated peers to stall Tokio workers by submitting mempool transactions requiring expensive synchronous script verification. Attackers can send non-standard high-sigop P2SH transactions that reach CachedFfiTransaction::is_valid() before standardness checks, saturating the verifier buffer and rendering the node unresponsive.
References
- https://github.com/ZcashFoundation/zebra/security/advisories/GHSA-84j3-rw4c-gqmj
- https://www.vulncheck.com/advisories/zebra-before-6.0.0-denial-of-service-via-synchronous-
This high severity vulnerability with a CVSS score of 8.7 was published on 2026-10-02 via NVD.
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