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0xCERT Security Advisory 0xCERT-2026-0203
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Advisory-ID:  0xCERT-2026-0203
Severity:     Low
Published:    2026-07-02T19:42:05.000Z
Updated:      2026-10-08T22:47:32.676Z
Chains:       n/a
URL:          https://www.0xcert.com/advisory/0xCERT-2026-0203

Title: Zebra has pre-handshake buffer capacity reservation based on attacker-claimed body length

Summary
- -------
Zebra has pre-handshake buffer capacity reservation based on attacker-claimed body length. You are affected if: 1. You run 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 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-network (rust) <= 6.0.0 — fixed in 7.0.0
- - zebrad (rust) <= 4.4.1 — fixed in 4.5.0

Severity
Low, as rated by the upstream advisory.

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

Source & attribution
This 0xCERT advisory summarises GHSA-h72h-ppcx-998p from the GitHub Advisory Database, credited upstream to ouicate, oxarbitrage: https://github.com/advisories/GHSA-h72h-ppcx-998p. Details may change; refer to the original source for the authoritative record.

References
- ----------
- - https://github.com/advisories/GHSA-h72h-ppcx-998p
- - https://github.com/ZcashFoundation/zebra/security/advisories/GHSA-h72h-ppcx-998p
- - https://github.com/ZcashFoundation/zebra/blob/d4cd662c716382f6397d2a730148025a1ca79fec/zebra-network/src/peer/handshake.rs#L917-L934
- - https://github.com/ZcashFoundation/zebra/blob/d4cd662c716382f6397d2a730148025a1ca79fec/zebra-network/src/protocol/external/codec.rs#L359-L416

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