CVE-2026-52731
MediumCVSS 6.5Exploitation Probability (EPSS)
Low risk31th percentile - higher than 31% of all known CVEs
Summary
ZEBRA is a Zcash node written in Rust. Prior to 4.5.0, an attacker authenticated to an enabled RPC endpoint can terminate zebrad by supplying a getblocktemplate LongPollId with multi-byte UTF-8 characters. This triggers a Rust panic, and release builds use panic=abort, killing the process.
Risk Assessment
The risk is remote denial of service by an authenticated attacker, potentially causing node downtime.
Recommendation
Upgrade ZEBRA to version 4.5.0 or later, which fixes the issue by validating char boundaries before slicing.
Original NVD description (English source)
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.