{"id":"CVE-2025-24371","aliases":["GHSA-22qq-3xwm-r5x4","GO-2025-3442"],"url":"https://o3.security/vulnerability/CVE-2025-24371","summary":"Malicious peer can make node stuck in blocksync in github.com/cometbft/cometbft","details":"CometBFT is a distributed, Byzantine fault-tolerant, deterministic state machine replication engine. In the `blocksync` protocol peers send their `base` and `latest` heights when they connect to a new node (`A`), which is syncing to the tip of a network. `base` acts as a lower ground and informs `A` that the peer only has blocks starting from height `base`. `latest` height informs `A` about the latest block in a network. Normally, nodes would only report increasing heights. If `B` fails to provide the latest block, `B` is removed and the `latest` height (target height) is recalculated based on other nodes `latest` heights. The existing code however doesn't check for the case where `B` first reports `latest` height `X` and immediately after height `Y`, where `X > Y`. `A` will be trying to catch up to 2000 indefinitely. This condition requires the introduction of malicious code in the full node first reporting some non-existing `latest` height, then reporting lower `latest` height and nodes which are syncing using `blocksync` protocol. This issue has been patched in versions 1.0.1 and 0.38.17 and all users are advised to upgrade. Operators may attempt to ban malicious peers from the network as a workaround.","published":"2025-02-03T21:20:56.024Z","modified":"2026-08-07T11:49:30.268293537Z","cvss":null,"epss":null,"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"Go","name":"github.com/cometbft/cometbft","fixedVersion":"1.0.1"},{"ecosystem":"Go","name":"github.com/cometbft/cometbft","fixedVersion":"0.38.17"}],"fix":null,"references":[{"type":"WEB","url":"https://github.com/cometbft/cometbft/releases/tag/v0.38.17"},{"type":"WEB","url":"https://github.com/cometbft/cometbft/releases/tag/v1.0.1"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/24xxx/CVE-2025-24371.json"},{"type":"ADVISORY","url":"https://github.com/cometbft/cometbft/security/advisories/GHSA-22qq-3xwm-r5x4"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2025-24371"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-07T11:49:30.268293537Z"}}