Vulnerability Description
ZEBRA is a Zcash node written entirely in Rust. Prior to zebrad version 4.4.0, prior to zebra-chain version 7.0.0, and prior to zebra-network version 6.0.0, several inbound deserialization paths in Zebra allocated buffers sized against generic transport or block-size ceilings before the tighter protocol or consensus limits were enforced. An unauthenticated or post-handshake peer could therefore force the node to preallocate and parse for orders of magnitude more data than the protocol intended, across headers messages, equihash solutions in block headers, Sapling spend vectors in V5/V4 transactions, and coinbase script bytes in blocks. This issue has been patched in zebrad version 4.4.0, zebra-chain version 7.0.0, and zebra-network version 6.0.0.
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Zfnd | Zebra-Chain | < 7.0.0 |
| Zfnd | Zebra-Network | < 6.0.0 |
| Zfnd | Zebrad | < 4.4.0 |
Related Weaknesses (CWE)
References
- https://github.com/ZcashFoundation/zebra/security/advisories/GHSA-438q-jx8f-cccvExploitVendor Advisory
FAQ
What is CVE-2026-44500?
CVE-2026-44500 is a vulnerability with a CVSS score of 5.3 (MEDIUM). ZEBRA is a Zcash node written entirely in Rust. Prior to zebrad version 4.4.0, prior to zebra-chain version 7.0.0, and prior to zebra-network version 6.0.0, several inbound deserialization paths in Ze...
How severe is CVE-2026-44500?
CVE-2026-44500 has been rated MEDIUM with a CVSS base score of 5.3/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-44500?
Check the references section above for vendor advisories and patch information. Affected products include: Zfnd Zebra-Chain, Zfnd Zebra-Network, Zfnd Zebrad.