CVE-2023-42806

Hydra is the layer-two scalability solution for Cardano. Prior to version 0.13.0, not signing and verifying `$\mathsf{cid}$` allows an attacker (which must be a participant of this head) to use a snapshot from an old head instance with the same participants to close the head or contest the state with it. This can lead to an incorrect distribution of value (= value extraction attack; hard, but possible) or prevent the head to finalize because the value available is not consistent with the closed utxo state (= denial of service; easy). A patch is planned for version 0.13.0. As a workaround, rotate keys between heads so not to re-use keys and not result in the same multi-signature participants.

• CWE-347

• https://github.com/input-output-hk/hydra/blob/ec6c7a2ab651462228475d0b34264e9a182c22bb/hydra-node/src/Hydra/HeadLogic.hs#L357Product
• https://github.com/input-output-hk/hydra/blob/ec6c7a2ab651462228475d0b34264e9a182c22bb/hydra-node/src/Hydra/Snapshot.hs#L50-L54Product
• https://github.com/input-output-hk/hydra/blob/ec6c7a2ab651462228475d0b34264e9a182c22bb/hydra-plutus/src/Hydra/Contract/Head.hs#L583-L599Product
• https://github.com/input-output-hk/hydra/security/advisories/GHSA-gr36-mc6v-72qqVendor Advisory
• https://github.com/input-output-hk/hydra/blob/ec6c7a2ab651462228475d0b34264e9a182c22bb/hydra-node/src/Hydra/HeadLogic.hs#L357Product
• https://github.com/input-output-hk/hydra/blob/ec6c7a2ab651462228475d0b34264e9a182c22bb/hydra-node/src/Hydra/Snapshot.hs#L50-L54Product
• https://github.com/input-output-hk/hydra/blob/ec6c7a2ab651462228475d0b34264e9a182c22bb/hydra-plutus/src/Hydra/Contract/Head.hs#L583-L599Product
• https://github.com/input-output-hk/hydra/security/advisories/GHSA-gr36-mc6v-72qqVendor Advisory

Published

Sep 21, 2023

Last Modified

Jun 17, 2026

Status

Modified

• Same Subject, Wrong User: A Cross-Issuer Account Takeover in n8nStrix found an identity-binding bug in n8n's token-exchange flow enabling account takeover.
• Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
• PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
• AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.

• CVE-2023-42800Moonlight-common-c contains the core GameStream client code …8.8
• CVE-2023-42801Moonlight-common-c contains the core GameStream client code …7.6
• CVE-2023-42802GLPI is a free asset and IT management software package. Sta…9.8
• CVE-2023-42803BigBlueButton is an open-source virtual classroom. BigBlueBu…8.8
• CVE-2023-42804BigBlueButton is an open-source virtual classroom. BigBlueBu…5.3
• CVE-2023-42805quinn-proto is a state machine for the QUIC transport protoc…7.5
• CVE-2023-42807Frappe LMS is an open source learning management system. In …9.8
• CVE-2023-42808Common Voice is the web app for Mozilla Common Voice, a plat…6.1
• CVE-2023-42809Redisson is a Java Redis client that uses the Netty framewor…8.8
• CVE-2023-4281This Activity Log WordPress plugin before 2.8.8 retrieves cl…5.3
• CVE-2023-42810systeminformation is a System Information Library for Node.J…9.8
• CVE-2023-42811aes-gcm is a pure Rust implementation of the AES-GCM. Starti…5.5