CVE-2026-104436
LOW
CVSS 3.7
Published: 2026-10-02
Modified: 2026-10-02
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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.
Quick Facts
| CVE ID | CVE-2026-104436 |
| CVSS Score | 3.7 |
| Vector | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L |
| Published | 2026-10-02 |
| Exploited | No |
| CISA KEV | No |
| PoC | Not public |