CVE-2026-109365Zebra before 6.4.0 Denial of Service via Same-Hash Forged Block Bodies
Updated under an hour ago ()
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It affects ZcashFoundation zebra. Add what you run to find out whether that includes you.
No exploitation reported and no EPSS estimate yet.
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Zebra before 6.4.0 contains an uncontrolled resource consumption vulnerability that allows unauthenticated peers to force full proof verification by serving forged block bodies with valid header hashes. Attackers can flip authorizing-only bytes such as a coinbase scriptSig, wasting Sapling, Orchard, and Ironwood proof verification without penalty and stalling sync for 67 seconds.
- CVSS
- 3.7 LOW (v3.1, CNA)CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L
- Weakness (CWE)
- CWE-345
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- VulnCheck
- NVD analysis
- Deferred
- Record last updated
- Oct 13, 2026
- First seen by InfoSec Signals
- Oct 12, 2026
Affected products
ZcashFoundation zebra zcashfoundation:zebra (from the name) | before 6.4.0; 6.4.0 not affected | CNA record |
References
- https://github.com/ZcashFoundation/zebra/security/advisories/GHSA-3c94-hf7p-g5mfvendor-advisory
- https://www.vulncheck.com/advisories/zebra-before-6.4.0-denial-of-service-via-same-hash-forged-block-bodiesthird-party-advisory
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.