CVE-2026-44885
MediumCVSS 5.5Exploitation Probability (EPSS)
Low risk45th percentile - higher than 45% of all known CVEs
Summary
A vulnerability in Portainer Community Edition from version 2.33.0 to 2.33.7 allows writing files to arbitrary locations on the server filesystem via a crafted .tar.gz archive. The ExtractTarGz function does not prevent directory traversal, enabling overwriting of critical system files.
Risk Assessment
An attacker can exploit this vulnerability to place malicious files, e.g., in the cron directory, potentially leading to server compromise or privilege escalation.
Recommendation
Immediately update Portainer CE to version 2.33.8 or later. Restrict access to the backup restore feature to trusted users only.
Other vulnerabilities in Portainer
See all- CVE-2026-44881Critical
Portainer Community Edition from version 2.33.0 to 2.33.8, 2.39.2, and 2.41.0 contains a vulnerability where, during creation or update of Git-backed stacks, go-git v5 creates OS symlinks on the host filesystem without validation, except for .gitmodules. An authenticated user with rights to manage Git stacks can include a docker-compose.yml file as a symlink to an arbitrary path, causing the GET /api/stacks/{id}/file endpoint to read and return the symlink target's contents in the HTTP response.
- CVE-2026-44883High
Portainer Community Edition versions 2.33.0 through 2.33.8, 2.39.2, and 2.41.0 accept JWT tokens via the ?token= URL parameter, leading to token leakage through proxy logs, browser history, and Referer headers. A leaked token grants full user privileges until expiration (default 8 hours).
- CVE-2026-44882High
In Portainer Community Edition from version 2.33.0 to 2.33.7, there is a vulnerability due to a missing return statement after a token validation error in the kubeClientMiddleware layer. This causes a request with an invalid token to be forwarded to the Kubernetes cluster, bypassing authorization checks.
- CVE-2026-44850High
Portainer Community Edition versions 2.33.0 through 2.33.7, 2.39.1, and 2.40.0 have a vulnerability in the Disable bind mounts security setting for non-administrators. The enforcement check only inspected the HostConfig.Binds array, ignoring the equivalent HostConfig.Mounts array, allowing authenticated users to mount arbitrary host paths into containers.
- CVE-2026-44849High
A vulnerability in Portainer Community Edition allows bypassing seven EndpointSecuritySettings restrictions when creating Docker Swarm services. These restrictions are enforced on the standard container creation path but not applied on the Swarm service API, enabling unprivileged users to launch containers with dangerous configurations.
- CVE-2026-44848High
In Portainer Community Edition versions 2.33.0 through 2.33.8, 2.39.2, and 2.41.0, the Docker plugin management endpoints (/plugins/*) were not registered with a handler. This allowed standard users with endpoint access to perform privileged plugin operations, including installing and enabling plugins, directly against the underlying Docker daemon.
Original NVD description (English source)
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, Portainer's backup restore feature accepts a .tar.gz archive and extracts it to a target directory on the server. The extraction function (ExtractTarGz in api/archive/targz.go) constructed output paths using filepath.Clean(filepath.Join(outputDirPath, header.Name)). This combination does not prevent directory traversal — a tar entry named ../../etc/cron.d/evil resolves to a path outside the extraction root, so a crafted archive can write files to arbitrary locations on the server filesystem. This vulnerability is fixed in 2.33.8.