EUVD-2026-39802Severity by source
AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
Local-only exploitation (AV:L) requires an existing shell account (PR:L) and a prior admin git:auth invocation (UI:R); only plaintext credential confidentiality is impacted (C:H, I:N, A:N).
Primary rating from Vendor (GitHub_M).
CVSS VectorNVD
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
Lifecycle Timeline
4DescriptionNVD
Dokku is a docker-powered PaaS. Prior to 0.38.2, the git:auth command creates $DOKKU_ROOT/.netrc using bash's touch command, which applies the default umask of 0644. This pre-creation defeats the netrc binary's built-in 0600 permission setting, leaving git credentials readable by any local user who can traverse the dokku home directory. This vulnerability is fixed in 0.38.2.
AnalysisAI
Insufficiently protected credential storage in Dokku prior to 0.38.2 exposes git authentication secrets stored in $DOKKU_ROOT/.netrc to any local user who can traverse the Dokku home directory. The git:auth command pre-creates the .netrc file using bash's touch, which applies the process umask (0644) before the netrc binary runs - defeating the netrc binary's own 0600 enforcement because the file already exists at write time. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Three conditions must all be true for exploitation: (1) Dokku version prior to 0.38.2 must be installed; (2) the Dokku administrator must have previously executed the git:auth command at least once, which creates $DOKKU_ROOT/.netrc - without this step, no .netrc file exists and there is nothing to read; (3) the attacker must hold a local shell account on the same host and have execute (traverse) permission on the Dokku home directory. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.1 score of 5.0 with vector AV:L/AC:L/PR:L/UI:R/S:U/C:H/I:N/A:N is well-calibrated for this vulnerability. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | A local user on a multi-tenant Dokku server lists or reads $DOKKU_ROOT/.netrc directly - no exploit code required, only standard file read access. The file, left world-readable at 0644 by the touch pre-creation, yields plaintext git credentials for any configured hosts (e.g., GitHub, GitLab, internal Gitea). … |
| Remediation | Upgrade Dokku to version 0.38.2 or later, which is the vendor-released patch confirmed by the GitHub security advisory GHSA-xh7p-9crg-pchr and the merged PR at https://github.com/dokku/dokku/pull/8589. … Detailed patch versions, workarounds, and compensating controls in full report. |
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Same weakness CWE-522 – Insufficiently Protected Credentials
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External POC / Exploit Code
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