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0xCERT Security Advisory 0xCERT-2026-0201
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Advisory-ID:  0xCERT-2026-0201
Severity:     Medium
Published:    2026-07-02T19:37:58.000Z
Updated:      2026-10-08T22:47:32.096Z
Chains:       n/a
URL:          https://www.0xcert.com/advisory/0xCERT-2026-0201

Title: zebrad vulnerable to full node denial of service via crafted Sapling receiver in z_listunifiedreceivers

Summary
- -------
zebrad vulnerable to full node denial of service via crafted Sapling receiver in z_listunifiedreceivers. You are affected if: 1. You run zebrad up to and including v4.4.1. 2. Your zebrad.toml sets rpc.listenaddr to a TCP address (RPC server is enabled). 3. An attacker can authenticate to the RPC endpoint.

Details
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Summary
You are affected if: 1. You run zebrad up to and including v4.4.1. 2. Your zebrad.toml sets rpc.listenaddr to a TCP address (RPC server is enabled). 3. An attacker can authenticate to the RPC endpoint.

Affected
- - zebra-rpc (rust) <= 7.0.0 — fixed in 8.0.0
- - zebrad (rust) <= 4.4.1 — fixed in 4.5.0

Severity
Medium, as rated by the upstream advisory.

Recommended actions
- - Upgrade zebra-rpc to 8.0.0 or later
- - Upgrade zebrad to 4.5.0 or later

Source & attribution
This 0xCERT advisory summarises GHSA-c8w6-x74f-vmg3 from the GitHub Advisory Database, credited upstream to robustfengbin, mpguerra, upbqdn: https://github.com/advisories/GHSA-c8w6-x74f-vmg3. Details may change; refer to the original source for the authoritative record.

References
- ----------
- - https://github.com/advisories/GHSA-c8w6-x74f-vmg3
- - https://github.com/ZcashFoundation/zebra/security/advisories/GHSA-c8w6-x74f-vmg3
- - https://github.com/ZcashFoundation/zebra/blob/d4cd662c716382f6397d2a730148025a1ca79fec/Cargo.toml#L305
- - https://github.com/ZcashFoundation/zebra/blob/d4cd662c716382f6397d2a730148025a1ca79fec/zebra-rpc/src/methods.rs#L2867-L2914

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