PatchTheCVECVE-2026-40881: ZEBRA is a Zcash node written entirely in Rust
CVE-2026-40881 is a high-severity flaw (CVSS 7.5) affecting zebra-network, zebrad. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.
ZEBRA is a Zcash node written entirely in Rust. Prior to zebrad version 4.3.0 and zebra-network version 5.0.1, when deserializing addr or addrv2 messages, which contain vectors of addresses, Zebra would fully deserialize them up to a maximum length (over 233,000) that was derived from the 2 MiB message size limit. This is much larger than the actual limit of 1,000 messages from the specification. Zebra would eventually check that limit but, at th
Why this priority
- High severity
- Remotely exploitable, no login, no user action
A fixed release or distro patch exists.
Risk facts
| CVSS score | 7.5 (High) |
| Attack vector | Network (remote) |
| Attack complexity | Low |
| Privileges needed | None |
| User interaction | None |
| EPSS exploit chance | 0.3% (top 82%) |
| CISA exploited list | No |
| Weakness | CWE-770 |
| Published | 2026-04-21 |
| Last modified | 2026-10-26 |
Last updated 2026-10-26 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score
Am I affected?
Timeline
- Published CVE record published
- Updated Record last modified
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.
Quick answers
How do I fix CVE-2026-40881?
zebra-network: upgrade to 5.0.1; zebrad: upgrade to 4.3.1. Exact commands for each OS are on this page.
Is CVE-2026-40881 being exploited?
CVE-2026-40881 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.
What does CVE-2026-40881 affect?
CVE-2026-40881 affects zebra-network, zebrad. Severity is high (CVSS 7.5). ZEBRA is a Zcash node written entirely in Rust. Prior to zebrad version 4.3.0 and zebra-network version 5.0.1, when deserializing addr or addrv2 messages, which contain vectors of addresses, Zebra would fully deserialize them up to a maximu
How urgent is CVE-2026-40881?
Priority 36/100. High severity; Remotely exploitable, no login, no user action
Related CVEs
- CVE-2026-44500 MEDIUM 5.3 UPGRADE UPGRADE ZEBRA is a Zcash node written entirely in Rust