zebrad has full node denial of service via non-ASCII LongPollId in getblocktemplate
zebrad has full node denial of service via non-ASCII LongPollId in getblocktemplate. You are affected if: 1. You run zebrad up to and including v4.4.1. 2. Your zebrad.toml sets rpc.listenaddr to a TCP address (RPC server is enabled). 3. An attacker can authenticate to the RPC endpoint.
Vuln-watch · relayed from the GitHub Advisory Database; see Source & attribution below
Summary
You are affected if: 1. You run zebrad up to and including v4.4.1. 2. Your zebrad.toml sets rpc.listenaddr to a TCP address (RPC server is enabled). 3. An attacker can authenticate to the RPC endpoint.
Affected
- zebra-rpc (rust) <= 7.0.0 — fixed in 8.0.0
- zebrad (rust) <= 4.4.1 — fixed in 4.5.0
Severity
Medium, as rated by the upstream advisory.
Recommended actions
- Upgrade zebra-rpc to 8.0.0 or later
- Upgrade zebrad to 4.5.0 or later
Source & attribution
This 0xCERT advisory summarises GHSA-qv2r-v3mx-f4pf / CVE-2026-52731 from the GitHub Advisory Database, credited upstream to sangsoo-osec, mpguerra, upbqdn: https://github.com/advisories/GHSA-qv2r-v3mx-f4pf. Details may change; refer to the original source for the authoritative record.
References
OpenPGP-signed. The signed text of this advisory verifies against the 0xCERT key CCC7 D9EC 9415 723D.
Published 2026-07-02 · last updated 2026-10-08
curl -s https://www.0xcert.com/pgp.asc | gpg --import && curl -s https://www.0xcert.com/advisory/0xCERT-2026-0199/signed.txt | gpg --verify