Vulnerability Description
ZEBRA is a Zcash node written entirely in Rust. Prior to 4.5.0, an attacker authenticated to an enabled Zebra RPC endpoint can terminate zebrad by supplying a getblocktemplate LongPollId containing multi-byte UTF-8 characters. In zebra-rpc/src/methods/types/long_poll.rs, LongPollId::from_str originally checked the input byte length and then sliced fixed byte ranges to parse encoded fields. A slice boundary can land inside a multi-byte character and trigger Rust's byte index is not a char boundary panic. Zebra release builds use panic equals abort, so one malformed authenticated RPC request terminates the entire node process and can be repeated after restart. This issue is fixed in version 4.5.0.
CVSS Score
MEDIUM
Related Weaknesses (CWE)
References
- https://github.com/ZcashFoundation/zebra/commit/1440b43ca7df59aca948090d45117557
- https://github.com/ZcashFoundation/zebra/releases/tag/v4.5.0
- https://github.com/ZcashFoundation/zebra/security/advisories/GHSA-qv2r-v3mx-f4pf
FAQ
What is CVE-2026-52731?
CVE-2026-52731 is a vulnerability with a CVSS score of 6.5 (MEDIUM). ZEBRA is a Zcash node written entirely in Rust. Prior to 4.5.0, an attacker authenticated to an enabled Zebra RPC endpoint can terminate zebrad by supplying a getblocktemplate LongPollId containing mu...
How severe is CVE-2026-52731?
CVE-2026-52731 has been rated MEDIUM with a CVSS base score of 6.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-52731?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.