{"id":"CVE-2026-45539","summary":"Microsoft APM: Symlinks under `.apm/prompts/` and `.apm/agents/` are dereferenced during `apm install`, copying host-local file contents into the project tree","details":"Microsoft APM is an open-source, community-driven dependency manager for AI agents. From 0.5.4 to 0.12.4, two primitive integrators in apm-cli enumerate package files with bare Path.glob() / Path.rglob() calls and read each match with Path.read_text(), transparently following symbolic links. A symlink committed inside a remote APM dependency under .apm/prompts/\u003cx\u003e.prompt.md or .apm/agents/\u003cx\u003e.agent.md is preserved verbatim into apm_modules/ on clone and then dereferenced during integration, with the resolved content written as a regular file into the project's deploy directories. The package content_hash, the pre-deploy SecurityGate scan, and apm audit do not flag this. The deploy roots are not added to the auto-generated .gitignore, so the resulting files are staged by git add by default. This vulnerability is fixed in 0.13.0.","aliases":["GHSA-q5pp-gvjg-h7v4","PYSEC-2026-2377"],"modified":"2026-08-07T11:31:23.899845142Z","published":"2026-05-15T16:02:37.591Z","database_specific":{"cna_assigner":"GitHub_M","cwe_ids":["CWE-200","CWE-59"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/45xxx/CVE-2026-45539.json"},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/45xxx/CVE-2026-45539.json"},{"type":"ADVISORY","url":"https://github.com/microsoft/apm/security/advisories/GHSA-q5pp-gvjg-h7v4"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-45539"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/microsoft/apm","events":[{"introduced":"56f47dff3c6aab6c5aef59126e5eacf3ef61795d"},{"fixed":"921651639e4bc8231190d816ad4982a163529951"}],"database_specific":{"source":"AFFECTED_FIELD","extracted_events":[{"introduced":"0.5.4"},{"fixed":"0.13.0"}]}}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-45539.json"}}],"schema_version":"1.8.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:N/A:N"}]}