CVE-2026-104436

LOWCVSS 3.7

Description

Zebra before 4.5.0 contains an uncontrolled resource consumption vulnerability that allows remote P2P peers to exhaust blocking-pool threads by sending oversized block locator vectors. Attackers can send getblocks or getheaders messages with up to 65,535 locator hashes, triggering per-hash chain lookups that degrade block validation, RPC, and mempool performance.

Timeline

Published:October 2nd, 2026 12:17 PM

Last modified:October 29th, 2026 9:17 PM

CVSS Scoring

CVSS v3: 3.7 (LOW)

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L

Weaknesses (CWE)

CWE-770

References & Reports

Advisories, patches, and third-party reports

https://github.com/ZcashFoundation/zebra/security/advisories/GHSA-443g-gwgp-49x4
https://www.vulncheck.com/advisories/zebra-before-4.5.0-cpu-amplification-via-uncapped-getblocks-getheaders-locator-length

Source: NIST NVD · Data may lag official sources by up to one minute