CVE-2026-45539

HIGHNVD 7.47.4
EchelonGraph scoreMEDIUM confidence

“—” beside the score: it is equal to NVD's CVSS score.

This high-severity CVE scores 7.4 under NVD CVSS v3. EPSS exploit probability: 1.1% (63rd percentile of EPSS-scored CVEs). No GitHub Security Advisory CVSS is on record for this CVE.

Triggered by: Headline CVSS from NVD CVSS v3
Sources: EPSS, NVD CVSS v3
7.4EG
EchelonGraph verdictPlan a fixRemediate within your standard update timelines (the SSVC decision on this page).
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1.1%CVSS: 7.4Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

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
7.4HIGHmedium confidence
EG Risk
34
EG Risk 34/100

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed (value × EchelonGraph’s weight)
Severity74% × 45%
The EG Score, 7.4 of 10.
Exploitation1.1% × 40%
FIRST EPSS: the 30-day exploitation probability when EchelonGraph scored this CVE.
Automatability0% × 15%
CISA's SSVC Automatable value: no (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at every mission impact level.
Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE.
Action: A fix is available. Apply it within your standard update timelines.
EPSS PROB
1.1%
EPSS %ILE
63rd
KEV
Not listed

SSVC (CISA's decision table, applied by EchelonGraph)Track at every mission impact level.

A fix is available. Apply it within your standard update timelines.

Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE. Mission impact is CISA's Mission & Well-being decision point, and only you can judge it. CISA's table makes it high when Mission Prevalence is Essential — the vulnerable component "directly provides capabilities that constitute at least one MEF for at least one entity" (MEF: mission essential function) — or when Public Well-Being Impact is Irreversible: "multiple fatalities are likely", the cyber-physical system "is likely lost or destroyed", "extreme or serious externalities" are imposed on other parties, or social systems such as elections or the financial grid "are destabilized and potentially collapse". CISA's decision table

BOD 26-04 (CISA's remediation timeline, Table 1)60 days if the affected system is publicly exposed; Fix on system upgrade if it is not.

In CISA KEV no (CISA's KEV catalog) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Whether your system is publicly exposed is yours to answer. BOD 26-04 binds US Federal Civilian Executive Branch agencies; for anyone else it is CISA's published timeline, a reference rather than an obligation. The directive · how EchelonGraph applies it

Published

May 15, 2026

Last Modified

May 18, 2026

Advisory Details (1)

Auto-updated May 15, 2026
Patch available. Sources: github.
GitHub advisoryMentions a patch (unverified)

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 rangeFix by version rangeDependents
apm—
  • 0.5.4 up to 0.13.0: fixed in 0.13.0
—

Weakness Classification(2)

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

Data Freshness Timeline

(refreshed 11× in last 7d / 28× in last 30d)

Each row is a time one of our pipelines fetched, updated or re-scored this CVE. 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. An arrow marks a change the record states ("CVSS v3 → 9.1"); EPSS and GHSA rows show the values recorded at that time, not what changed (EPSS values are rounded; hover one for the exact figures). Most recent first.

Showing the most recent 99 of 172 refreshes on record for this CVE.

A repeat, a row identical to one the same pipeline wrote less than 10 seconds earlier, is not a separate refresh and is not counted. 1 repeat row among the latest 100 is merged into the row it repeats. The 73 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-10-15 16:32 UTCEPSS rescoreEPSS 1.1% · 63rd percentile
  2. 2026-10-14 16:33 UTCEPSS rescoreEPSS 1.1% · 63rd percentile
  3. 2026-10-13 16:34 UTCEPSS rescoreEPSS 1.1% · 63rd percentile
  4. 2026-10-12 16:34 UTCEPSS rescoreEPSS 1.1% · 63rd percentile
  5. 2026-10-12 16:04 UTCEG score recompute
  6. 2026-10-11 19:46 UTCEG score recompute
  7. 2026-10-11 17:01 UTCEG score recompute
  8. 2026-10-11 14:26 UTCEG score recompute
  9. 2026-10-11 13:48 UTCEPSS rescoreEPSS 1.1% · 63rd percentile
  10. 2026-10-10 20:00 UTCEPSS rescoreEPSS 1.1% · 63rd percentile
  11. 2026-10-09 20:07 UTCEPSS rescoreEPSS 1.1% · 63rd percentile
  12. 2026-10-08 17:12 UTCEPSS rescoreEPSS 1.1% · 63rd percentile
  13. 2026-10-07 23:48 UTCEPSS rescoreEPSS 1.1% · 63rd percentile
  14. 2026-10-06 15:18 UTCEPSS rescoreEPSS 1.1% · 63rd percentile
  15. 2026-10-05 17:43 UTCEPSS rescoreEPSS 1.1% · 63rd percentile
  16. 2026-10-04 23:22 UTCEPSS rescoreEPSS 1.1% · 63rd percentile
  17. 2026-10-03 14:25 UTCEPSS rescoreEPSS 1.1% · 63rd percentile
  18. 2026-10-01 19:50 UTCEPSS rescoreEPSS 1.1% · 63rd percentile
  19. 2026-09-30 15:03 UTCEPSS rescoreEPSS 1.1% · 63rd percentile
  20. 2026-09-30 04:28 UTCOSV refresh
  21. 2026-09-27 13:48 UTCEPSS rescoreEPSS 1.1% · 63rd percentile
  22. 2026-09-26 15:58 UTCEPSS rescoreEPSS 1.1% · 63rd percentile
  23. 2026-09-23 17:53 UTCEPSS rescoreEPSS 0.7% · 49th percentile
  24. 2026-09-20 20:15 UTCEPSS rescoreEPSS 0.7% · 49th percentile
  25. 2026-09-18 19:28 UTCEPSS rescoreEPSS 0.7% · 49th percentile
Show 74 more
  1. 2026-09-17 19:31 UTCEPSS rescoreEPSS 0.7% · 49th percentile
  2. 2026-09-16 14:08 UTCEPSS rescoreEPSS 0.7% · 49th percentile
  3. 2026-09-16 05:15 UTCEPSS rescoreEPSS 0.7% · 49th percentile
  4. 2026-09-13 16:47 UTCEPSS rescoreEPSS 0.7% · 49th percentile
  5. 2026-09-12 15:01 UTCEPSS rescoreEPSS 0.7% · 49th percentile
  6. 2026-09-11 14:53 UTCEPSS rescoreEPSS 0.7% · 49th percentile
  7. 2026-09-11 09:37 UTCEPSS rescoreEPSS 0.7% · 49th percentile
  8. 2026-09-11 07:23 UTCOSV refresh
  9. 2026-09-10 09:34 UTCEPSS rescoreEPSS 0.7% · 49th percentile
  10. 2026-09-08 22:00 UTCEPSS rescoreEPSS 0.7% · 49th percentile
  11. 2026-09-07 16:01 UTCEPSS rescoreEPSS 0.7% · 49th percentile
  12. 2026-09-06 13:47 UTCEPSS rescoreEPSS 0.7% · 49th percentile
  13. 2026-09-04 05:06 UTCEPSS rescoreEPSS 0.7% · 48th percentile
  14. 2026-09-02 14:12 UTCEPSS rescoreEPSS 0.7% · 48th percentile
  15. 2026-09-01 13:54 UTCEPSS rescoreEPSS 0.7% · 48th percentile
  16. 2026-08-30 19:17 UTCEPSS rescoreEPSS 0.7% · 48th percentile
  17. 2026-08-30 01:22 UTCEPSS rescoreEPSS 0.7% · 48th percentile
  18. 2026-08-28 21:41 UTCEPSS rescoreEPSS 0.7% · 48th percentile
  19. 2026-08-27 14:25 UTCEPSS rescoreEPSS 0.7% · 48th percentile
  20. 2026-08-26 14:46 UTCEPSS rescoreEPSS 0.7% · 48th percentile
  21. 2026-08-25 13:49 UTCEPSS rescoreEPSS 0.7% · 48th percentile
  22. 2026-08-23 17:28 UTCEG score recompute
  23. 2026-08-23 00:19 UTCEPSS rescoreEPSS 0.7% · 48th percentile
  24. 2026-08-22 01:30 UTCEG score recompute
  25. 2026-08-21 23:49 UTCEPSS rescoreEPSS 0.7% · 48th percentile
  26. 2026-08-20 22:55 UTCEPSS rescoreEPSS 0.7% · 48th percentile
  27. 2026-08-20 19:24 UTCEG score recompute
  28. 2026-08-19 17:04 UTCEPSS rescoreEPSS 0.7% · 48th percentile
  29. 2026-08-18 13:48 UTCEPSS rescoreEPSS 0.7% · 48th percentile
  30. 2026-08-17 13:47 UTCEPSS rescoreEPSS 0.7% · 48th percentile
  31. 2026-08-17 10:16 UTCEG score recompute
  32. 2026-08-16 14:56 UTCEPSS rescoreEPSS 0.7% · 48th percentile
  33. 2026-08-16 03:49 UTCEG score recompute
  34. 2026-08-16 02:14 UTCEPSS rescoreEPSS 0.7% · 48th percentile
  35. 2026-08-15 01:30 UTCEPSS rescoreEPSS 0.7% · 48th percentile
  36. 2026-08-14 02:18 UTCEG score recompute
  37. 2026-08-13 22:00 UTCEPSS rescoreEPSS 0.7% · 48th percentile
  38. 2026-08-12 14:51 UTCEG score recompute
  39. 2026-08-12 13:51 UTCEPSS rescoreEPSS 0.7% · 48th percentile
  40. 2026-08-11 14:00 UTCEG score recompute
  41. 2026-08-11 00:48 UTCEG score recompute
  42. 2026-08-11 00:00 UTCEPSS rescoreEPSS 0.7% · 47th percentile
  43. 2026-08-09 23:59 UTCEG score recompute
  44. 2026-08-09 13:46 UTCEPSS rescoreEPSS 0.7% · 47th percentile
  45. 2026-08-09 01:45 UTCEG score recompute
  46. 2026-08-08 16:37 UTCEPSS rescoreEPSS 0.7% · 47th percentile
  47. 2026-08-07 18:01 UTCEG score recompute
  48. 2026-08-06 19:41 UTCEG score recompute
  49. 2026-08-06 13:47 UTCEPSS rescoreEPSS 0.7% · 47th percentile
  50. 2026-08-05 21:30 UTCEG score recompute
  51. 2026-08-05 19:17 UTCEPSS rescoreEPSS 0.7% · 47th percentile
  52. 2026-08-04 15:10 UTCEPSS rescoreEPSS 0.7% · 47th percentile
  53. 2026-08-04 10:38 UTCEPSS rescoreEPSS 0.7% · 47th percentile
  54. 2026-08-03 18:55 UTCEG score recompute
  55. 2026-08-03 10:36 UTCEPSS rescoreEPSS 0.7% · 47th percentile
  56. 2026-08-02 07:26 UTCEG score recompute
  57. 2026-08-02 02:27 UTCEPSS rescoreEPSS 0.7% · 47th percentile
  58. 2026-08-01 18:56 UTCEG score recompute
  59. 2026-08-01 04:16 UTCEPSS rescoreEPSS 0.7% · 47th percentile
  60. 2026-07-30 16:28 UTCEPSS rescoreEPSS 0.7% · 47th percentile
  61. 2026-07-30 01:30 UTCEPSS rescoreEPSS 0.7% · 47th percentile
  62. 2026-07-28 15:36 UTCEPSS rescoreEPSS 0.7% · 47th percentile
  63. 2026-07-27 14:13 UTCEPSS rescoreEPSS 0.7% · 47th percentile
  64. 2026-07-26 14:54 UTCEPSS rescoreEPSS 0.7% · 47th percentile
  65. 2026-07-25 14:18 UTCEPSS rescoreEPSS 0.7% · 47th percentile
  66. 2026-07-24 14:17 UTCEPSS rescoreEPSS 0.7% · 47th percentile
  67. 2026-07-23 14:18 UTCEPSS rescoreEPSS 0.7% · 47th percentile
  68. 2026-07-23 03:16 UTCEG score recompute
  69. 2026-07-22 14:08 UTCEPSS rescoreEPSS 0.7% · 47th percentile
  70. 2026-07-21 15:24 UTCEPSS rescoreEPSS 0.7% · 47th percentile
  71. 2026-07-20 17:08 UTCEPSS rescoreEPSS 0.7% · 47th percentile
  72. 2026-07-19 14:31 UTCEPSS rescoreEPSS 0.7% · 47th percentile
  73. 2026-07-19 02:29 UTCEPSS rescoreEPSS 0.7% · 47th percentile
  74. 2026-07-18 10:04 UTCEPSS rescoreEPSS 0.7% · 47th percentile

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-45539?
CVE-2026-45539 is a high-severity vulnerability; its CVE record was 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 the CVE record for CVE-2026-45539 published?
The CVE record for CVE-2026-45539 was published on May 15, 2026. That is the record's publication date; the vulnerability itself may have been made public earlier. EchelonGraph's copy of the record carries a last-modified date of May 18, 2026; the record at its source may have been updated since.
Is CVE-2026-45539 actively exploited?
CVE-2026-45539 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1.1% probability of exploitation in the next 30 days (63rd percentile of EPSS-scored CVEs).
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?
A fix for CVE-2026-45539 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-45539 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

See which npm, PyPI, Go, and Maven packages are affected by CVE-2026-45539

Explore →

Is Your Infrastructure Affected by CVE-2026-45539?

EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.

Book a Demo →Browse All CVEs