CVE-2026-27626
Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.
NVD · uneditedOliveTin gives access to predefined shell commands from a web interface. In versions up to and including 3000.10.0, OliveTin's shell mode safety check (`checkShellArgumentSafety`) blocks several dangerous argument types but not `password`. A user supplying a `password`-typed argument can inject shell metacharacters that execute arbitrary OS commands. A second independent vector allows unauthenticated RCE via webhook-extracted JSON values that skip type safety checks entirely before reaching `sh -c`. When exploiting vector 1, any authenticated user (registration enabled by default, `authType: none` by default) can execute arbitrary OS commands on the OliveTin host with the permissions of the OliveTin process. When exploiting vector 2, an unauthenticated attacker can achieve the same if the instance receives webhooks from external sources, which is a primary OliveTin use case. When an attacker exploits both vectors, this results in unauthenticated RCE on any OliveTin instance using Shell mode with webhook-triggered actions. As of time of publication, a patched version is not available.
Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.
dbcve analysis · high confidenceOliveTin versions up to 3000.10.0 contain two critical RCE vectors: (1) the `checkShellArgumentSafety` function fails to sanitize 'password'-typed arguments, allowing shell metacharacter injection; (2) webhook-extracted JSON values bypass type safety checks entirely before reaching `sh -c`. When combined with the default `authType: none` setting and webhook-enabled actions, this enables unauthenticated arbitrary command execution on the host OS.
Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.
Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.
NVD · CPE data<= 3000.10.0CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.
From the vector- Attack vector
- Network
- Complexity
- Low
- Privileges
- Low
- User interaction
- None
- Scope
- Changed
- Confidentiality
- High
- Integrity
- High
- Availability
- High
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.
dbcve checksWork through these to decide whether this CVE applies to you.
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Identify OliveTin versionCheck the running container or installed binary version (e.g., docker ps, helm list, or check /opt/olivetin/config.yaml for version field)Affected if Version is 3000.10.0 or lower
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Verify authentication settingInspect the configuration file (config.yaml) for the authType parameter under the auth: sectionAffected if authType is set to none or is absent (defaulting to none)
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Confirm execution modeExamine config.yaml for the execution mode setting - look for execConfig: or shell: blocks under action definitionsAffected if Shell mode is enabled (actions use shell: instead of exec:)
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Check user registration policyReview config.yaml for registration settings - look for allowRegistration or similar fields under auth:Affected if Open registration is enabled (no invite code required)
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Identify exposed webhook actionsReview action definitions in config.yaml for any actions that accept webhook-triggered JSON input (webhook: true or webhookUrl: fields)Affected if Webhook-triggered actions exist that pass external JSON to shell execution
You are affected if running OliveTin <= 3000.10.0 with Shell execution mode enabled and either authType set to none or open user registration allowing unauthenticated access.
Generated from the published advisory. Verify against your own configuration.
Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.
From vendor dataImplement compensating controls: enable authentication (`authType` to non-none), disable shell mode actions where possible, implement network segmentation for webhook endpoints, and add input validation/sanitization layers before shell execution until an official patch is available.
- Consultation6.0 h
- Implementation16.0 h
- Testing10.0 h
- Review / QA6.0 h
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Free · runs locallyCheck whether your project pulls in CVE-2026-27626 — or any other known-vulnerable package — straight from your lock files. Free and open source; it runs locally and uploads nothing.
References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.
Primary sourcesPractitioner notes
ContributedPeer-ranked notes from engineers who’ve handled CVE-2026-27626 in production — separate from our analysis above.
The advisory tells you what broke. It rarely tells you what actually worked. If you’ve dealt with this one, that detail is what the next engineer is searching for.
- The version that genuinely resolved it — not the one the vendor claimed
- A config change or rule that shut the vector down
- A gotcha in the upgrade path that cost you an afternoon
No notes yet
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- Version or environment caveats, and links to real fixes
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