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0xCERT Security Advisory 0xCERT-2026-0223
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Advisory-ID:  0xCERT-2026-0223
Severity:     Critical
Published:    2026-03-27T22:19:24.000Z
Updated:      2026-10-08T22:48:27.550Z
Chains:       n/a
URL:          https://www.0xcert.com/advisory/0xCERT-2026-0223

Title: Zebra node crash — V5 transaction hash panic (P2P reachable)

Summary
- -------
Zebra node crash — V5 transaction hash panic (P2P reachable). --- 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.

Details
- -------
Summary
- --- 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.

Affected
- - zebrad (rust) < 4.3.0 — fixed in 4.3.0
- - zebra-chain (rust) < 6.0.1 — fixed in 6.0.1

Severity
Critical (CVSS 9.2), as rated by the upstream advisory.

Recommended actions
- - Upgrade zebrad to 4.3.0 or later
- - Upgrade zebra-chain to 6.0.1 or later

Source & attribution
This 0xCERT advisory summarises GHSA-qp6f-w4r3-h8wg / CVE-2026-34202 from the GitHub Advisory Database, credited upstream to robustfengbin, arya2, conradoplg, upbqdn, mpguerra: https://github.com/advisories/GHSA-qp6f-w4r3-h8wg. Details may change; refer to the original source for the authoritative record.

References
- ----------
- - https://github.com/advisories/GHSA-qp6f-w4r3-h8wg
- - CVE-2026-34202
- - https://github.com/ZcashFoundation/zebra/security/advisories/GHSA-qp6f-w4r3-h8wg
- - https://github.com/ZcashFoundation/zebra/releases/tag/v4.3.0
- - https://zfnd.org/zebra-4-3-0-critical-security-fixes-zip-235-support-and-performance-improvements
- - https://nvd.nist.gov/vuln/detail/CVE-2026-34202

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