Answer in brief
CVE-2026-52731 records a Medium severity vulnerability in ZEBRA: Full node denial of service via non-ASCII LongPollId in getblocktemplate. The current sources do not mark it as known exploited. The current feed maps ZcashFoundation/zebra (generic), ZcashFoundation/zebra-rpc (generic), zebrad (rust), zebra-rpc (rust). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
Answer in brief
CVE-2026-52731 records a Medium severity vulnerability in ZEBRA: Full node denial of service via non-ASCII LongPollId in getblocktemplate. The current sources do not mark it as known exploited. The current feed maps ZcashFoundation/zebra (generic), ZcashFoundation/zebra-rpc (generic), zebrad (rust), zebra-rpc (rust). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps ZcashFoundation/zebra (generic), ZcashFoundation/zebra-rpc (generic), zebrad (rust), zebra-rpc (rust). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| ZcashFoundation/zebrageneric | < 4.5.0 | Not reported |
| ZcashFoundation/zebra-rpcgeneric | < 8.0.0 | Not reported |
| zebradrust | <=4.4.1 | 4.5.0 |
| zebra-rpcrust | <=7.0.0 | 8.0.0 |
Published upstream
Aug 18, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 18, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Jul 2, 2026
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.
Quoted source text, attributed separately from HOL analysis.
A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps ZcashFoundation/zebra (generic), ZcashFoundation/zebra-rpc (generic), zebrad (rust), zebra-rpc (rust). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| ZcashFoundation/zebrageneric | < 4.5.0 | Not reported |
| ZcashFoundation/zebra-rpcgeneric | < 8.0.0 | Not reported |
| zebradrust | <=4.4.1 | 4.5.0 |
| zebra-rpcrust | <=7.0.0 | 8.0.0 |
Published upstream
Aug 18, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 18, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Jul 2, 2026
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.
Quoted source text, attributed separately from HOL analysis.