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0xCERT Security Advisory 0xCERT-2026-0204
============================================================

Advisory-ID:  0xCERT-2026-0204
Severity:     High
Published:    2026-07-02T19:43:08.000Z
Updated:      2026-10-08T22:47:32.967Z
Chains:       n/a
URL:          https://www.0xcert.com/advisory/0xCERT-2026-0204

Title: Zebra has block suppression via NU5 same-header body poisoning of sent-hash cache

Summary
- -------
Zebra has block suppression via NU5 same-header body poisoning of sent-hash cache. You are affected if: 1. You run any version of zebrad up to and including v4.4.1. 2. Your node accepts inbound P2P connections (network.listenaddr is set, which is the default).

Details
- -------
Summary
You are affected if: 1. You run any version of zebrad up to and including v4.4.1. 2. Your node accepts inbound P2P connections (network.listenaddr is set, which is the default).

Affected
- - zebra-state (rust) <= 6.0.0 — fixed in 7.0.0
- - zebrad (rust) <= 4.4.1 — fixed in 4.5.0

Severity
High (CVSS 8.7), as rated by the upstream advisory.

Recommended actions
- - Upgrade zebra-state to 7.0.0 or later
- - Upgrade zebrad to 4.5.0 or later

Source & attribution
This 0xCERT advisory summarises GHSA-4m69-67m6-prqp / CVE-2026-52736 from the GitHub Advisory Database, credited upstream to ipwning, x15-eth, upbqdn, conradoplg, mpguerra: https://github.com/advisories/GHSA-4m69-67m6-prqp. Details may change; refer to the original source for the authoritative record.

References
- ----------
- - https://github.com/advisories/GHSA-4m69-67m6-prqp
- - CVE-2026-52736
- - https://github.com/ZcashFoundation/zebra/security/advisories/GHSA-4m69-67m6-prqp
- - https://github.com/ZcashFoundation/zebra/blob/d4cd662c716382f6397d2a730148025a1ca79fec/zebra-state/src/service.rs#L659-L714
- - https://github.com/ZcashFoundation/zebra/blob/d4cd662c716382f6397d2a730148025a1ca79fec/zebra-state/src/service.rs#L797-L802

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