VulnerabilityAnalyzed

CVE-2026-34202

Prior to zebrad version 4.3.0 and zebra-chain version 6.0.1, a vulnerability in Zebra's transaction processing logic allows a remote, unauthenticated attacker to cause a Zebra node to panic (crash).

CRITICAL 9.2EPSS 0.73%

Does this matter?

High impact if exploited, but EPSS currently rates exploitation as unlikely (0.73%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.

Description

ZEBRA is a Zcash node written entirely in Rust. Prior to zebrad version 4.3.0 and zebra-chain version 6.0.1, a vulnerability in Zebra's transaction processing logic allows a remote, unauthenticated attacker to cause a Zebra node to panic (crash). This is triggered by sending a specially crafted V5 transaction that passes initial deserialization but fails during transaction ID calculation. This issue has been patched in zebrad version 4.3.0 and zebra-chain version 6.0.1.

CVSS 4.0: 9.2 CRITICALCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:H/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/M
EPSS: 0.73% probability · 52th percentile
CISA KEV: Not listed
Weakness: CWE-94, CWE-1336, CWE-502
Affected: zfnd/zebra · zfnd/zebra-chain
Source: security-advisories@github.com

References

https://github.com/ZcashFoundation/zebra/releases/tag/v4.3.0Release Notes
https://github.com/ZcashFoundation/zebra/security/advisories/GHSA-qp6f-w4r3-h8wgVendor Advisory
https://zfnd.org/zebra-4-3-0-critical-security-fixes-zip-235-support-and-performance-improvementsVendor Advisory

Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.