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10 vulnerabilities found for hydra by NixOS
CVE-2025-54864 (GCVE-0-2025-54864)
Vulnerability from nvd – Published: 2025-08-12 15:48 – Updated: 2025-08-12 16:06
VLAI
Title
Hydra missing authentication when triggering evaluations through GitHub and Gitea plugins
Summary
Hydra is a continuous integration service for Nix based projects. Prior to commit f7bda02, /api/push-github and /api/push-gitea are called by the corresponding forge without HTTP Basic authentication. Both forges do however feature HMAC signing with a secret key. Triggering an evaluation can be very taxing on the infrastructure when large evaluations are done, introducing potential denial of service attacks on the host running the evaluator. This issue has been patched by commit f7bda02. A workaround involves blocking /api/push-github and /api/push-gitea via a reverse proxy.
Severity
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-306 - Missing Authentication for Critical Function
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://github.com/NixOS/hydra/security/advisorie… | x_refsource_CONFIRM |
| https://github.com/NixOS/hydra/commit/f7bda020c61… | x_refsource_MISC |
Impacted products
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}
],
"metrics": [
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"baseScore": 6.9,
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"userInteraction": "NONE",
"vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N",
"version": "4.0",
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],
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},
{
"name": "https://github.com/NixOS/hydra/commit/f7bda020c6144913f134ec616783e57817f7686f",
"tags": [
"x_refsource_MISC"
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"url": "https://github.com/NixOS/hydra/commit/f7bda020c6144913f134ec616783e57817f7686f"
}
],
"source": {
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"discovery": "UNKNOWN"
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"title": "Hydra missing authentication when triggering evaluations through GitHub and Gitea plugins"
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CVE-2025-54800 (GCVE-0-2025-54800)
Vulnerability from nvd – Published: 2025-08-12 15:47 – Updated: 2025-08-12 15:57
VLAI
Title
Hydra persistent XSS in build metrics
Summary
Hydra is a continuous integration service for Nix based projects. Prior to commit dea1e16, a malicious package can introduce arbitrary JavaScript code into the Hydra database that is automatically evaluated in a client's browser when anyone visits the build page. This could be done by a third-party project as part of its build process. This also happens in other places like with hydra-release-name. This issue has been patched by commit dea1e16. A workaround involves either not building untrusted packages or not visiting the builds page.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://github.com/NixOS/hydra/security/advisorie… | x_refsource_CONFIRM |
| https://github.com/NixOS/hydra/commit/dea1e168f59… | x_refsource_MISC |
Impacted products
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}
],
"metrics": [
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"subConfidentialityImpact": "NONE",
"subIntegrityImpact": "NONE",
"userInteraction": "PASSIVE",
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CVE-2025-32435 (GCVE-0-2025-32435)
Vulnerability from nvd – Published: 2025-04-15 22:19 – Updated: 2025-04-16 13:32
VLAI
Title
Hydra no restricted eval after nix-eval-jobs migration
Summary
Hydra is a Continuous Integration service for Nix based projects. Evaluation of untrusted non-flake nix code could potentially access secrets that are accessible by the hydra user/group. This should not affect the signing keys, that are owned by the hydra-queue-runner and hydra-www users respectively.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-95 - Improper Neutralization of Directives in Dynamically Evaluated Code ('Eval Injection')
Assigner
References
4 references
| URL | Tags |
|---|---|
| https://github.com/NixOS/hydra/security/advisorie… | x_refsource_CONFIRM |
| https://github.com/NixOS/nixpkgs/pull/397919 | x_refsource_MISC |
| https://github.com/NixOS/hydra/commit/8d750265135… | x_refsource_MISC |
| https://github.com/nix-community/nix-eval-jobs/re… | x_refsource_MISC |
Impacted products
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"timestamp": "2025-04-16T13:32:43.320086Z",
"version": "2.0.3"
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"scope": "UNCHANGED",
"userInteraction": "REQUIRED",
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CVE-2024-45049 (GCVE-0-2024-45049)
Vulnerability from nvd – Published: 2024-08-27 20:33 – Updated: 2024-08-28 14:03
VLAI
Title
Nix Hydra Missing authentication when triggering evaluations
Summary
Hydra is a Continuous Integration service for Nix based projects. It is possible to trigger evaluations in Hydra without any authentication. Depending on the size of evaluations, this can impact the availability of systems. The problem can be fixed by applying https://github.com/NixOS/hydra/commit/f73043378907c2c7e44f633ad764c8bdd1c947d5 to any Hydra package. Users are advised to upgrade. Users unable to upgrade should deny the `/api/push` route in a reverse proxy. This also breaks the "Evaluate jobset" button in the frontend.
Severity
7.5 (High)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-306 - Missing Authentication for Critical Function
Assigner
References
4 references
| URL | Tags |
|---|---|
| https://github.com/NixOS/hydra/security/advisorie… | x_refsource_CONFIRM |
| https://github.com/NixOS/nixpkgs/pull/337766 | x_refsource_MISC |
| https://github.com/NixOS/hydra/commit/f7304337890… | x_refsource_MISC |
| https://mastodon.delroth.net/@delroth/11302983263… | x_refsource_MISC |
Impacted products
{
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"cpe:2.3:a:nixos:hydra:-:*:*:*:*:*:*:*"
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"vendor": "nixos",
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"version": "2.0.3"
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"vendor": "NixOS",
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"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
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{
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"tags": [
"x_refsource_MISC"
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},
{
"name": "https://mastodon.delroth.net/@delroth/113029832631860419",
"tags": [
"x_refsource_MISC"
],
"url": "https://mastodon.delroth.net/@delroth/113029832631860419"
}
],
"source": {
"advisory": "GHSA-xv29-v93r-2f5v",
"discovery": "UNKNOWN"
},
"title": "Nix Hydra Missing authentication when triggering evaluations"
}
},
"cveMetadata": {
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"assignerShortName": "GitHub_M",
"cveId": "CVE-2024-45049",
"datePublished": "2024-08-27T20:33:01.326Z",
"dateReserved": "2024-08-21T17:53:51.331Z",
"dateUpdated": "2024-08-28T14:03:00.616Z",
"state": "PUBLISHED"
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CVE-2024-32657 (GCVE-0-2024-32657)
Vulnerability from nvd – Published: 2024-04-22 22:24 – Updated: 2024-08-02 02:13
VLAI
Title
Hydra has persistent XSS vulnerability serving HTML build outputs
Summary
Hydra is a Continuous Integration service for Nix based projects. Attackers can execute arbitrary code in the browser context of Hydra and execute authenticated HTTP requests. The abused feature allows Nix builds to specify files that Hydra serves to clients. One use of this functionality is serving NixOS `.iso` files. The issue is only with html files served by Hydra. The issue has been patched on https://hydra.nixos.org around 2024-04-21 14:30 UTC. The nixpkgs package were fixed in unstable and 23.11. Users with custom Hydra packages can apply the fix commit to their local installations. The vulnerability is only triggered when opening HTML build artifacts, so not opening them until the vulnerability is fixed works around the issue.
Severity
4.6 (Medium)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Assigner
References
4 references
| URL | Tags |
|---|---|
| https://github.com/NixOS/hydra/security/advisorie… | x_refsource_CONFIRM |
| https://github.com/NixOS/nixpkgs/pull/306017 | x_refsource_MISC |
| https://github.com/NixOS/nixpkgs/pull/306018 | x_refsource_MISC |
| https://github.com/NixOS/hydra/commit/b72528be507… | x_refsource_MISC |
Impacted products
3 products
{
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{
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"cpe:2.3:a:nixos:hydra:*:*:*:*:*:*:*:*"
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CVE-2025-54864 (GCVE-0-2025-54864)
Vulnerability from cvelistv5 – Published: 2025-08-12 15:48 – Updated: 2025-08-12 16:06
VLAI
Title
Hydra missing authentication when triggering evaluations through GitHub and Gitea plugins
Summary
Hydra is a continuous integration service for Nix based projects. Prior to commit f7bda02, /api/push-github and /api/push-gitea are called by the corresponding forge without HTTP Basic authentication. Both forges do however feature HMAC signing with a secret key. Triggering an evaluation can be very taxing on the infrastructure when large evaluations are done, introducing potential denial of service attacks on the host running the evaluator. This issue has been patched by commit f7bda02. A workaround involves blocking /api/push-github and /api/push-gitea via a reverse proxy.
Severity
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-306 - Missing Authentication for Critical Function
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://github.com/NixOS/hydra/security/advisorie… | x_refsource_CONFIRM |
| https://github.com/NixOS/hydra/commit/f7bda020c61… | x_refsource_MISC |
Impacted products
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CVE-2025-54800 (GCVE-0-2025-54800)
Vulnerability from cvelistv5 – Published: 2025-08-12 15:47 – Updated: 2025-08-12 15:57
VLAI
Title
Hydra persistent XSS in build metrics
Summary
Hydra is a continuous integration service for Nix based projects. Prior to commit dea1e16, a malicious package can introduce arbitrary JavaScript code into the Hydra database that is automatically evaluated in a client's browser when anyone visits the build page. This could be done by a third-party project as part of its build process. This also happens in other places like with hydra-release-name. This issue has been patched by commit dea1e16. A workaround involves either not building untrusted packages or not visiting the builds page.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://github.com/NixOS/hydra/security/advisorie… | x_refsource_CONFIRM |
| https://github.com/NixOS/hydra/commit/dea1e168f59… | x_refsource_MISC |
Impacted products
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CVE-2025-32435 (GCVE-0-2025-32435)
Vulnerability from cvelistv5 – Published: 2025-04-15 22:19 – Updated: 2025-04-16 13:32
VLAI
Title
Hydra no restricted eval after nix-eval-jobs migration
Summary
Hydra is a Continuous Integration service for Nix based projects. Evaluation of untrusted non-flake nix code could potentially access secrets that are accessible by the hydra user/group. This should not affect the signing keys, that are owned by the hydra-queue-runner and hydra-www users respectively.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-95 - Improper Neutralization of Directives in Dynamically Evaluated Code ('Eval Injection')
Assigner
References
4 references
| URL | Tags |
|---|---|
| https://github.com/NixOS/hydra/security/advisorie… | x_refsource_CONFIRM |
| https://github.com/NixOS/nixpkgs/pull/397919 | x_refsource_MISC |
| https://github.com/NixOS/hydra/commit/8d750265135… | x_refsource_MISC |
| https://github.com/nix-community/nix-eval-jobs/re… | x_refsource_MISC |
Impacted products
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CVE-2024-45049 (GCVE-0-2024-45049)
Vulnerability from cvelistv5 – Published: 2024-08-27 20:33 – Updated: 2024-08-28 14:03
VLAI
Title
Nix Hydra Missing authentication when triggering evaluations
Summary
Hydra is a Continuous Integration service for Nix based projects. It is possible to trigger evaluations in Hydra without any authentication. Depending on the size of evaluations, this can impact the availability of systems. The problem can be fixed by applying https://github.com/NixOS/hydra/commit/f73043378907c2c7e44f633ad764c8bdd1c947d5 to any Hydra package. Users are advised to upgrade. Users unable to upgrade should deny the `/api/push` route in a reverse proxy. This also breaks the "Evaluate jobset" button in the frontend.
Severity
7.5 (High)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-306 - Missing Authentication for Critical Function
Assigner
References
4 references
| URL | Tags |
|---|---|
| https://github.com/NixOS/hydra/security/advisorie… | x_refsource_CONFIRM |
| https://github.com/NixOS/nixpkgs/pull/337766 | x_refsource_MISC |
| https://github.com/NixOS/hydra/commit/f7304337890… | x_refsource_MISC |
| https://mastodon.delroth.net/@delroth/11302983263… | x_refsource_MISC |
Impacted products
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CVE-2024-32657 (GCVE-0-2024-32657)
Vulnerability from cvelistv5 – Published: 2024-04-22 22:24 – Updated: 2024-08-02 02:13
VLAI
Title
Hydra has persistent XSS vulnerability serving HTML build outputs
Summary
Hydra is a Continuous Integration service for Nix based projects. Attackers can execute arbitrary code in the browser context of Hydra and execute authenticated HTTP requests. The abused feature allows Nix builds to specify files that Hydra serves to clients. One use of this functionality is serving NixOS `.iso` files. The issue is only with html files served by Hydra. The issue has been patched on https://hydra.nixos.org around 2024-04-21 14:30 UTC. The nixpkgs package were fixed in unstable and 23.11. Users with custom Hydra packages can apply the fix commit to their local installations. The vulnerability is only triggered when opening HTML build artifacts, so not opening them until the vulnerability is fixed works around the issue.
Severity
4.6 (Medium)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Assigner
References
4 references
| URL | Tags |
|---|---|
| https://github.com/NixOS/hydra/security/advisorie… | x_refsource_CONFIRM |
| https://github.com/NixOS/nixpkgs/pull/306017 | x_refsource_MISC |
| https://github.com/NixOS/nixpkgs/pull/306018 | x_refsource_MISC |
| https://github.com/NixOS/hydra/commit/b72528be507… | x_refsource_MISC |
Impacted products
3 products
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