Zebra before 6.2.1 contains an incomplete cleanup vulnerability that allows unauthenticated peers to block downloading of valid blocks by leaving rejected hashes in SentHashes. Attackers can send a contextually invalid block sharing an honest block's header hash, causing Request::KnownBlock to skip the honest block and keep nodes behind the tip.
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 11:45:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| Description | Zebra before 6.2.1 contains an incomplete cleanup vulnerability that allows unauthenticated peers to block downloading of valid blocks by leaving rejected hashes in SentHashes. Attackers can send a contextually invalid block sharing an honest block's header hash, causing Request::KnownBlock to skip the honest block and keep nodes behind the tip. | |
| Title | Zebra before 6.2.1 Block Download Denial of Service via KnownBlock SentHashes Lockout | |
| First Time appeared |
Zfnd
Zfnd zebra |
|
| Weaknesses | CWE-459 | |
| CPEs | cpe:2.3:a:zfnd:zebra:*:*:*:*:*:*:*:* | |
| Vendors & Products |
Zfnd
Zfnd zebra |
|
| References |
| |
| Metrics |
cvssV3_1
|
Projects
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Status: PUBLISHED
Assigner: VulnCheck
Published:
Updated: 2026-10-02T12:28:10.585Z
Reserved: 2026-10-02T00:46:23.830Z
Link: CVE-2026-104421
No data.
Status : Received
Published: 2026-10-02T12:17:12.143
Modified: 2026-10-02T12:17:12.143
Link: CVE-2026-104421
No data.
OpenCVE Enrichment
Updated: 2026-10-02T12:30:20Z
Weaknesses