{"id":"CVE-2026-11752","aliases":["GHSA-hgw6-8c77-v4gq"],"url":"https://o3.security/vulnerability/CVE-2026-11752","summary":"Armeria: External Control of File Name or Path in xDS SDS DataSource","details":"## External Control of File Name or Path in xDS SDS DataSource\n\n### Summary\n\n`DataSourceStream` in the `:xds` module resolves control-plane-supplied `filename` and `environment_variable` fields from SDS Secret resources without any allow-list or base-directory confinement. A semi-trusted or compromised xDS control plane (or an attacker who can MITM SDS responses) can read arbitrary local files and environment variables on the xDS client host.\n\n**Affected component:** `xds/src/main/java/com/linecorp/armeria/xds/DataSourceStream.java`\n**Introduced in:** Armeria 1.38.0 (commit `b199560b10`, \"Add support for SDS\", #6597)\n**Affected versions:** 1.38.0, 1.39.0\n\n### Impact\n\nA semi-trusted or compromised xDS control plane (or an attacker who can inject/MITM SDS responses) can:\n\n- **Read arbitrary files** on the xDS client host — TLS private keys, `/etc/passwd`, mounted Kubernetes service-account tokens, cloud credential files, etc.\n- **Read arbitrary environment variables** — `AWS_SECRET_ACCESS_KEY`, CI tokens, database credentials, etc.\n\nThe read bytes are consumed as TLS key/cert/CA material. Combined with CWE-295 (silent disabling of upstream TLS peer verification), the exfiltrated secret can be presented to an attacker-chosen upstream, enabling data exfiltration. This is a confused-deputy / information-disclosure primitive driven entirely by control-plane-supplied configuration.\n\n**Severity:** High — arbitrary host-level file and environment variable read via control-plane-pushed configuration.\n\n### Patches\n\n1.40.0\n\nThe fix should:\n\n1. **Confine `filename` resolution** to an operator-configured allow-list of base directories. After normalization, reject any path that escapes the allow-listed root.\n2. **Gate `environment_variable`** behind an explicit operator allow-list of permitted variable names.\n3. **Default to denying** both `filename` and `environment_variable` DataSources for control-plane-delivered (SDS) secrets unless explicitly enabled by the operator. This is stricter than upstream Envoy but appropriate when the control plane is not fully trusted.\n4. **Document the trust model** clearly so operators understand that enabling file/env DataSources grants the control plane host-level read capability.\n\n### Workarounds\n\n- Ensure the xDS control plane channel is authenticated and encrypted (mTLS) to prevent MITM injection of malicious SDS responses.\n- Run the xDS client with minimal filesystem permissions and a restricted environment to limit the blast radius of arbitrary reads.\n- If SDS file-based secrets are not needed, consider using inline `DataSource` bytes only (delivered over the SDS stream itself) and auditing control-plane configurations to ensure no `filename` or `environment_variable` DataSources are present.","published":"2026-06-19T04:29:31.970Z","modified":"2026-10-28T02:30:47.056650448Z","cvss":null,"epss":{"score":0.00317,"percentile":0.24649,"asOf":"2026-09-17"},"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"Maven","name":"com.linecorp.armeria:armeria-xds","fixedVersion":"1.40.0"}],"fix":null,"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/11xxx/CVE-2026-11752.json"},{"type":"ADVISORY","url":"https://github.com/line/armeria/security/advisories/GHSA-hgw6-8c77-v4gq"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-11752"},{"type":"PACKAGE","url":"https://github.com/line/armeria"},{"type":"WEB","url":"https://github.com/line/armeria/security/advisories/xds/src/main/java/com/linecorp/armeria/xds/DataSourceStream.java"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-10-28T02:30:47.056650448Z"}}