CVE-2026-44500 Details
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.
A denial-of-service vulnerability has been identified in ZEBRA, a Zcash node implementation in Rust, affecting versions prior to zebrad 4.4.0, zebra-chain 7.0.0, and zebra-network 6.0.0. The vulnerability arises from several inbound deserialization paths that allocated buffers based on generic transport or block-size limits, before applying stricter protocol or consensus rules. This flaw allowed an unauthenticated or post-handshake peer to force the node to preallocate and parse significantly more data than intended, leading to increased memory usage and parsing costs. The issue is particularly pronounced when multiple peer connections are active, amplifying the impact.
Users are advised to upgrade to ZEBRA version 4.4.0 or later. There are no known workarounds for this vulnerability.
Metrics
CVSS 4.0 Severity and Vector Strings:
No CVSS 4.0 data is available for this CVE.
CVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
CISA-ADP
Assessed May 8, 2026References to Advisories, Solutions, and Tools
By selecting these links, you will be leaving this site. These are references gathered from the official CVE record and are not endorsed by Volerion.
| URL | Source(s) | Tag(s) |
|---|---|---|
| https://github.com/ZcashFoundation/zebra/security/advisories/GHSA-438q-jx8f-cccv | [email protected] | ExploitVendor Advisory |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-770 | Allocation of Resources Without Limits or Throttling | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| zfnd zebra-chain | < 7.0.0 |
CPE
Remediation
| |
| zfnd zebra-network | < 6.0.0 |
CPE
Remediation
| |
| zfnd zebrad | < 4.4.0 |
CPE
Remediation
| |
Change History
4 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jun 17, 2026 | CVE Modified | [email protected] |
| Jun 17, 2026 | CVE Modified | CISA-ADP |
| May 8, 2026 | Initial Analysis | [email protected] |
| May 8, 2026 | New CVE Received | [email protected] |