CVE-2026-104431CWE-405

CVE-2026-104431

High · published October 2, 2026

CVSS v3.1
7.5
EPSS
0%
Percentile
26.6
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
7.5 · HIGH
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CVSS v4.0
8.7 · CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
EPSS
0.00343 · 26.6th percentile
Weakness
CWE-405 · Asymmetric Resource Consumption (Amplification)
Published
2026-10-02T16:17Z
References (2)
https://github.com/ZcashFoundation/zebra/security/advisories/GHSA-84j3-rw4c-gqmj · [email protected]https://www.vulncheck.com/advisories/zebra-before-6.0.0-denial-of-service-via-synchronous-script-ffi-verification · [email protected]
EPSS history
Timeline
  • 04 OCT 03:27Z
    EPSS moved — → 0%
    epss
  • 02 OCT 11:38Z
    Zebra before 6.0.0 Denial of Service via Synchronous Script FFI Verification
    cvelistv5