CVE-2026-104421

5.3 MEDIUMpublic exploit available

Published 2026-10-02 · Updated 2026-10-02

AI analysis for this CVE has not been generated yet. Raw NVD data is shown below.

NVD 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.

CVSS vector

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

Weaknesses

CWE-459

Public exploit & PoC references

https://github.com/ZcashFoundation/zebra/security/advisories/GHSA-x93j-mj2f-q338

All references

https://github.com/ZcashFoundation/zebra/security/advisories/GHSA-x93j-mj2f-q338
https://www.vulncheck.com/advisories/zebra-before-6.2.1-block-download-denial-of-service-via-knownblock-senthashes-lockout

Source data: NVD (nvd.nist.gov), public domain. Exploit-DB.ai adds local AI analysis for defensive use only.

Related CVEs

MEDIUMCVE-2026-101100PoC
HIGHCVE-2026-102030
UNSCOREDCVE-2026-103937PoC
MEDIUMCVE-2026-104427PoC
HIGHCVE-2026-106203
MEDIUMCVE-2026-106243
MEDIUMCVE-2026-106262
CRITICALCVE-2026-106294

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