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.
Metrics
Affected Vendors & Products
Advisories
No advisories yet.
Fixes
Solution
No solution given by the vendor.
Workaround
No workaround given by the vendor.
References
History
Fri, 02 Oct 2026 13:15:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| First Time appeared |
Zcashfoundation
Zcashfoundation zebra |
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| Vendors & Products |
Zcashfoundation
Zcashfoundation zebra |
Fri, 02 Oct 2026 11:45:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| 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. | |
| Title | Zebra before 4.5.0 CPU Amplification via Uncapped getblocks/getheaders Locator Length | |
| First Time appeared |
Zfnd
Zfnd zebra |
|
| Weaknesses | CWE-770 | |
| CPEs | cpe:2.3:a:zfnd:zebra:*:*:*:*:*:*:*:* | |
| Vendors & Products |
Zfnd
Zfnd zebra |
|
| References |
| |
| Metrics |
cvssV3_1
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Projects
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Status: PUBLISHED
Assigner: VulnCheck
Published:
Updated: 2026-10-02T14:51:28.130Z
Reserved: 2026-10-02T00:50:26.604Z
Link: CVE-2026-104436
No data.
Status : Received
Published: 2026-10-02T12:17:14.210
Modified: 2026-10-02T12:17:14.210
Link: CVE-2026-104436
No data.
OpenCVE Enrichment
Updated: 2026-10-02T13:00:13Z
Weaknesses