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0xCERT Security Advisory 0xCERT-2026-0202
============================================================

Advisory-ID:  0xCERT-2026-0202
Severity:     Medium
Published:    2026-07-02T19:39:02.000Z
Updated:      2026-10-08T22:47:32.387Z
Chains:       n/a
URL:          https://www.0xcert.com/advisory/0xCERT-2026-0202

Title: zebrad has mempool transaction admission denial via single-peer inbound queue saturation

Summary
- -------
zebrad has mempool transaction admission denial via single-peer inbound queue saturation. 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
- - zebrad (rust) <= 4.4.1 — fixed in 4.5.0

Severity
Medium, as rated by the upstream advisory.

Recommended actions
- - Upgrade zebrad to 4.5.0 or later

Source & attribution
This 0xCERT advisory summarises GHSA-4fc2-h7jh-287c / CVE-2026-52732 from the GitHub Advisory Database, credited upstream to dingledropper, mpguerra, oxarbitrage: https://github.com/advisories/GHSA-4fc2-h7jh-287c. Details may change; refer to the original source for the authoritative record.

References
- ----------
- - https://github.com/advisories/GHSA-4fc2-h7jh-287c
- - CVE-2026-52732
- - https://github.com/ZcashFoundation/zebra/security/advisories/GHSA-4fc2-h7jh-287c
- - https://github.com/ZcashFoundation/zebra/blob/d4cd662c716382f6397d2a730148025a1ca79fec/zebrad/src/components/mempool/downloads.rs#L82

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