CVE-2026-45539

HIGHNVD 7.47.4—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 7.4 under NVD CVSS v3. EPSS exploit probability: 0.7%, top 53% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, nvd
7.4
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 1%CVSS: 7.4Exploit: NoneExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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/.prompt.md or .apm/agents/.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.

CVSS v3
7.4
EG Score
7.4(medium)
EPSS
47.0%
KEV
Not listed

Published

May 15, 2026

Last Modified

May 18, 2026

Advisory Details (1)

Auto-updated May 15, 2026
🔬 Proof of concept available. Patch available. Sources: github.
github Patch Available🟡 PoC Available

Symlinks under `.apm/prompts/` and `.apm/agents/` are dereferenced during `apm install`, copying host-local file contents into the project tree · Advisory · microsoft/apm · GitHub

https://github.com/microsoft/apm/security/advisories/GHSA-q5pp-gvjg-h7v4

Vendor Advisories for CVE-2026-45539(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Affected Packages

(1 across 1 ecosystem)
PyPI(1)
PackageVulnerable rangeFixed inDependents
apm—0.13.0—

Weakness Classification(2)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 7× in last 7d / 50× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 108 total refreshes for this CVE.

  1. 2026-07-12 05:46 UTCEPSS rescore
  2. 2026-07-11 08:27 UTCEPSS rescore
  3. 2026-07-09 19:10 UTCEPSS rescore
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  1. 2026-06-23 21:33 UTCEPSS rescore
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  22. 2026-06-13 23:00 UTCEPSS rescore
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  26. 2026-06-12 12:33 UTCEG score recompute
  27. 2026-06-12 01:27 UTCEG score recompute
  28. 2026-06-11 14:22 UTCEG score recompute
  29. 2026-06-11 14:00 UTCEPSS rescore
  30. 2026-06-11 03:16 UTCEG score recompute
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  39. 2026-06-08 14:17 UTCEPSS rescore
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  42. 2026-06-07 16:56 UTCEG score recompute
  43. 2026-06-07 15:25 UTCEPSS rescore
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  45. 2026-06-07 05:50 UTCEG score recompute
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  47. 2026-06-06 13:47 UTCEPSS rescore
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  49. 2026-06-06 07:39 UTCEG score recompute
  50. 2026-06-05 22:47 UTCEPSS rescore
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  64. 2026-06-01 13:52 UTCEPSS rescore
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  67. 2026-05-31 22:30 UTCEPSS rescore
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  71. 2026-05-29 13:44 UTCEPSS rescore
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  73. 2026-05-28 13:44 UTCEPSS rescore
  74. 2026-05-28 13:44 UTCEPSS rescore
  75. 2026-05-27 13:40 UTCEPSS rescore

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-45539?
CVE-2026-45539 is a high vulnerability published on May 15, 2026. 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.readtext(), transparently following symbolic links. A…
When was CVE-2026-45539 disclosed?
CVE-2026-45539 was first published in the National Vulnerability Database on May 15, 2026, with the most recent update on May 18, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-45539 actively exploited?
CVE-2026-45539 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 47.0% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-45539?
CVE-2026-45539 has a CVSS v3 base score of 7.4 (NVD).
How do I remediate CVE-2026-45539?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-45539, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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