CVE-2026-104436 — Zebra before 4.5.0 CPU Amplification via Uncapped getblocks/getheaders Locator Length
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 v…
Published: 2026-10-02 · CVSS: 6.3 · CVSS 4.0
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.
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7