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0xCERT Security Advisory 0xCERT-2026-0208
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Advisory-ID:  0xCERT-2026-0208
Severity:     Medium
Published:    2026-07-02T19:46:35.000Z
Updated:      2026-10-08T22:47:34.128Z
Chains:       n/a
URL:          https://www.0xcert.com/advisory/0xCERT-2026-0208

Title: Zebra: Repeated Non-Finalized Shielded Transaction Aborts Zebra Before Duplicate-Nullifier Rejection

Summary
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Zebra: Repeated Non-Finalized Shielded Transaction Aborts Zebra Before Duplicate-Nullifier Rejection. You are affected if: 1. You run zebrad up to and including v4.4.1. 2. Your node processes blocks past the checkpoint height (non-finalized state is active). 3. The network has NU5 or later activated.

Details
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Summary
You are affected if: 1. You run zebrad up to and including v4.4.1. 2. Your node processes blocks past the checkpoint height (non-finalized state is active). 3. The network has NU5 or later activated.

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

Severity
Medium, 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-hhm7-qrv5-h4r6 / CVE-2026-52739 from the GitHub Advisory Database, credited upstream to Haxatron, mpguerra, conradoplg: https://github.com/advisories/GHSA-hhm7-qrv5-h4r6. Details may change; refer to the original source for the authoritative record.

References
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- - https://github.com/advisories/GHSA-hhm7-qrv5-h4r6
- - CVE-2026-52739
- - https://github.com/ZcashFoundation/zebra/security/advisories/GHSA-hhm7-qrv5-h4r6
- - https://github.com/ZcashFoundation/zebra/blob/d4cd662c716382f6397d2a730148025a1ca79fec/Cargo.toml#L304-L305
- - https://github.com/ZcashFoundation/zebra/blob/d4cd662c716382f6397d2a730148025a1ca79fec/zebra-consensus/src/transaction.rs#L521-L526
- - https://github.com/ZcashFoundation/zebra/blob/d4cd662c716382f6397d2a730148025a1ca79fec/zebra-state/src/service/non_finalized_state/chain.rs#L1608-L1628

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