{"cve":"CVE-2023-42448","nvd":{"published":"2023-10-04T19:15:10.407","modified":"2026-06-17T06:23:51.070","status":"Modified","description":"Hydra is the layer-two scalability solution for Cardano. Prior to version 0.13.0, the specification states that the contestation period in the datum of the UTxO at the head validator must stay unchanged as the state progresses from Open to Closed (Close transaction), but no such check appears to be performed in the `checkClose` function of the head validator. This would allow a malicious participant to modify the contestation deadline of the head to either allow them to fanout the head without giving another participant the chance to contest, or prevent any participant from ever redistributing the funds locked in the head via a fan-out. Version 0.13.0 contains a patch for this issue.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H","score":8.1},"cwes":["CWE-1284","CWE-20"],"references":["https://github.com/input-output-hk/hydra/blob/master/CHANGELOG.md#0130---2023-10-03","https://github.com/input-output-hk/hydra/blob/master/hydra-plutus/src/Hydra/Contract/Head.hs#L284-L296","https://github.com/input-output-hk/hydra/blob/master/hydra-plutus/src/Hydra/Contract/Head.hs#L320-L323","https://github.com/input-output-hk/hydra/commit/2f45529729e28254a62f7a7c8d6649066923ed1f","https://github.com/input-output-hk/hydra/security/advisories/GHSA-mgcx-6p7h-5996"],"products":["iohk:hydra"],"source":"nvd","synced_at":"2026-10-19T21:39:34.467980132+00:00"},"epss":{"cve":"CVE-2023-42448","score":0.00977,"percentile":0.62163,"date":"2026-10-31"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}