Hydra
CVE-2023-42806
MEDIUM
Vulnerability Assessment
| Weakness |
CWE
OWASP Top 10:2025
A04:2025 - Cryptographic Failures
ASVS 5.0
V11 - Cryptography Signature verification
|
| Impact | CVSS score of 6.5 (MEDIUM). Attack characteristics: network attack vector, low complexity, high privileges required, no user interaction not required. |
| Exploit ScenarioDerived | This vulnerability can be exploited remotely over the network. Successful exploitation could compromise the medium-severity affected system. |
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Alert meAnalysisAI
Hydra is the layer-two scalability solution for Cardano. Rated medium severity (CVSS 6.5), this vulnerability is remotely exploitable, low attack complexity. No vendor patch available.
RemediationAI
No vendor patch is available at time of analysis. Monitor vendor advisories for updates. Apply vendor patches when available. Implement network segmentation and monitoring as interim mitigations.
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Technical ContextAI · show details
This vulnerability is classified under CWE-347. 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. Affected products include: Iohk Hydra. Version information: version 0.13.0.
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Severity by source
AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:H
Primary rating from NVD · only source for this CVE.
CVSS VectorNVD
DescriptionNVD
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.
Threat Intelligence Overview
NVD
CVE.org
EPSS
GitHub
How this decision was reached
The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.
What every action level means
SSVC AssessmentENISA
Priority Score
Attack Technique
Denial of Service attacks render applications or systems unavailable by overwhelming resources or triggering failure conditions.
Affected Products (CPE)NVD
Hydra is the layer-two scalability solution for Cardano. Rated critical severity (CVSS 9.1), this vulnerability is remot
Hydra is the two-layer scalability solution for Cardano. Rated high severity (CVSS 8.1), this vulnerability is remotely
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Code execution with the hosting application's privileges is possible in Hydra 1.3.4 through versions before 1.3.7 (and b
Pending deposits in Cardano Hydra heads can be stolen by any third party who can observe the chain and submit a standard
Hydra is the layer-two scalability solution for Cardano. Rated high severity (CVSS 8.1), this vulnerability is remotely
Configuration-controlled code execution in the hydra-optuna-sweeper package (Hydra 1.2.0 up to but not including 1.3.0,
Arbitrary code execution in Facebook Research Hydra prior to version 1.3.4 allows any party who can supply untrusted con
Hydra is a Continuous Integration service for Nix based projects. Rated high severity (CVSS 7.5), this vulnerability is
Hydra is a Continuous Integration service for Nix based projects. Rated medium severity (CVSS 5.4), this vulnerability i
In Hydra (an OAuth2 Server and OpenID Certified™ OpenID Connect Provider written in Go), before version 1.4.0+oryOS.17,
Exploit-DB