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0xCERT Security Advisory 0xCERT-2026-0227
============================================================

Advisory-ID:  0xCERT-2026-0227
Severity:     Medium
Published:    2026-04-18T00:42:05.000Z
Updated:      2026-10-08T22:48:28.712Z
Chains:       n/a
URL:          https://www.0xcert.com/advisory/0xCERT-2026-0227

Title: Zebra: addr/addrv2 Deserialization Resource Exhaustion

Summary
- -------
Zebra: addr/addrv2 Deserialization Resource Exhaustion. When deserializing addr or addrv2 messages, which contain vectors of addresses, Zebra would fully deserialize them up to a maximum length (over 233,000) that was derived from the 2 MiB message size limit.

Details
- -------
Summary
When deserializing addr or addrv2 messages, which contain vectors of addresses, Zebra would fully deserialize them up to a maximum length (over 233,000) that was derived from the 2 MiB message size limit.

Affected
- - zebrad (rust) < 4.3.1 — fixed in 4.3.1
- - zebra-network (rust) < 5.0.1 — fixed in 5.0.1

Severity
Medium (CVSS 6.3), as rated by the upstream advisory.

Recommended actions
- - Upgrade zebrad to 4.3.1 or later
- - Upgrade zebra-network to 5.0.1 or later

Source & attribution
This 0xCERT advisory summarises GHSA-xr93-pcq3-pxf8 / CVE-2026-40881 from the GitHub Advisory Database, credited upstream to Zk-nd3r, oxarbitrage, conradoplg, mpguerra: https://github.com/advisories/GHSA-xr93-pcq3-pxf8. Details may change; refer to the original source for the authoritative record.

References
- ----------
- - https://github.com/advisories/GHSA-xr93-pcq3-pxf8
- - CVE-2026-40881
- - https://github.com/ZcashFoundation/zebra/security/advisories/GHSA-xr93-pcq3-pxf8
- - https://nvd.nist.gov/vuln/detail/CVE-2026-40881

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