CVE-2026-44881

high

Published 2026-05-14 · Modified 2026-05-29

💬 Discuss on Community ✚ Propose mitigation

CVSS v3

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CVSS v4 NEW

8.5

CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:H/SI:H/SA:H

VIR risk

8.0

Description

Portainer Community Edition is a lightweight service delivery platform for containerized applications that can be used to manage Docker, Swarm, Kubernetes and ACI environments. From 2.33.0 to before 2.33.8, 2.39.2, and 2.41.0, Portainer supports deploying stacks from Git repositories. When a Git-backed stack is created or updated, Portainer clones the repository using go-git v5, which translates Git blob entries with mode 0o120000 (symlink) into real OS symlinks on the host filesystem via os.Symlink. The only entry blocked from becoming a symlink is .gitmodules; every other path is created as a symlink without validation. Portainer's GET /api/stacks/{id}/file endpoint then reads the stack entry point with os.ReadFile, which follows OS symlinks transparently. A repository containing docker-compose.yml as a symlink to an arbitrary filesystem path causes the symlink target's contents to be returned verbatim in the HTTP response. Any authenticated user with rights to create or update a Git-backed stack — the default configuration in Portainer CE — can read arbitrary files accessible to the Portainer process. This vulnerability is fixed in 2.33.8, 2.39.2, and 2.41.0.

Predictions

Exploit likelihood

20%

Patch ETA

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Heuristic predictions, AS-IS, for prioritization only.

Mitigations

No mitigations published for this CVE yet.

The vendor-content worker queues fetches as references arrive (check back in a few minutes). Or — if you've already worked around this in production — publish your fix to the community-verified tier.

✚ Propose a mitigation on Community → Mitigations published via the community go through AI scoring + 2 human reviewers + 7-day silent objection window before landing here with source_tier=community-verified.

Package impact

Ecosystem	Package	Vulnerable	Fixed
Go	github.com/portainer/portainer	`>=2.33.0,<2.33.8`	`2.33.8`
Go	github.com/portainer/portainer	`>=2.39.0,<2.39.2`	`2.39.2`
Go	github.com/portainer/portainer	`>=2.40.0,<2.41.0`	`2.41.0`
GO	github.com/portainer/portainer	`>= 2.40.0, < 2.41.0`	`2.41.0`
GO	github.com/portainer/portainer	`>= 2.39.0, < 2.39.2`	`2.39.2`
GO	github.com/portainer/portainer	`>= 2.33.0, < 2.33.8`	`2.33.8`

References

CWEs

CWE-59 CWE-200

Community-verified mitigations for this CVE will appear above when contributors publish them.

Verify integrity in audit chain (admin only). AS-IS.