Dragonfly's directories created via os.MkdirAll are not checked for permissions

Exploitation

No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.

CVSS 4.0

2.0 · CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:P · score source

EPSS

• CVE-2025-59349: 0.12% estimated exploitation activity in the next 30 days; percentile 1.61 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.

As published by the source; long descriptions are shortened.

Impact DragonFly2 uses the os.MkdirAll function to create certain directory paths with specific access permissions. This function does not perform any permission checks when a given directory path already exists. This allows a local attacker to create a directory to be used later by DragonFly2 with broad permissions before DragonFly2 does so, potentially allowing the attacker to tamper with the files. Eve has unprivileged access to the machine where Alice uses DragonFly2. Eve watches the commands executed by Alice and introduces new directories/paths with 0777 permissions before DragonFly2 does so. Eve can then delete and forge files in that directory to change the results of further commands executed by Alice. Patches - Dragonfy v2.1.0 and above. Workarounds There are no effective workarounds, beyond upgrading. References A third party security audit was performed by Trail of Bits, you can see the full report. If you have any questions or comments about this advisory, please email…

Published by the source

17 Sep 2025, 19:55 UTC

Last modified by the source

26 Sep 2025, 16:17 UTC

Source last checked

26 Oct 2026, 15:10 UTC

1. Revision 1 · created · 26 Oct 2026

   Published from ghsa record GHSA-8425-8r2f-mrv6

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# Patch Next advisory brief: CVE-2025-59349

Advisory: Dragonfly's directories created via os.MkdirAll are not checked for permissions
IDs: CVE-2025-59349, GHSA-8425-8r2f-mrv6
Record: https://patchnext.com/advisories/cve-2025-59349 (revision 1, source checked 26 Oct 2026, 15:10 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: Low (CVSS 2.0)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: github.com/dragonflyoss/dragonfly 2.1.0; d7y.io/dragonfly/v2 2.1.0. A vendor fix does not mean a deployment is fixed.

## Affected components
- Go github.com/dragonflyoss/dragonfly: affected < 2.1.0; fixed in 2.1.0
- Go d7y.io/dragonfly/v2: affected < 2.1.0; fixed in 2.1.0

## Suggested inspection (read-only)
- Go github.com/dragonflyoss/dragonfly: check the installed version with your package manager.
- Go d7y.io/dragonfly/v2: check the installed version with your package manager.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on github.com/dragonflyoss/dragonfly, d7y.io/dragonfly/v2.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://github.com/advisories/GHSA-8425-8r2f-mrv6 (GitHub-reviewed advisory GHSA-8425-8r2f-mrv6 lists affected ranges: Go github.com/dragonflyoss/dragonfly >=0 =0 <2.1.0)

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