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0xCERT Security Advisory 0xCERT-2026-0210
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Advisory-ID:  0xCERT-2026-0210
Severity:     Medium
Published:    2026-07-02T20:12:35.000Z
Updated:      2026-10-08T22:47:34.706Z
Chains:       n/a
URL:          https://www.0xcert.com/advisory/0xCERT-2026-0210

Title: zebrad has unbounded memory leak in mempool download pipeline via timeout path cancel_handles retention

Summary
- -------
zebrad has unbounded memory leak in mempool download pipeline via timeout path cancel_handles retention. 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-65jj-fmw8-468q / CVE-2026-52734 from the GitHub Advisory Database, credited upstream to AnticsDecoded, mpguerra: https://github.com/advisories/GHSA-65jj-fmw8-468q. Details may change; refer to the original source for the authoritative record.

References
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- - https://github.com/advisories/GHSA-65jj-fmw8-468q
- - CVE-2026-52734
- - https://github.com/ZcashFoundation/zebra/security/advisories/GHSA-65jj-fmw8-468q
- - https://github.com/ZcashFoundation/zebra/blob/d4cd662c716382f6397d2a730148025a1ca79fec/zebrad/src/components/mempool.rs#L663-L672
- - https://github.com/ZcashFoundation/zebra/blob/d4cd662c716382f6397d2a730148025a1ca79fec/zebrad/src/components/mempool/downloads.rs#L215-L228

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