CVE-2025-59342

MEDIUMNVD 5.55.5—
EchelonGraph scoreMEDIUM confidence

This medium-severity CVE scores 5.5 under NVD CVSS v3. EPSS exploit probability: 2.8%, top 15% 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
Elevated
5.5EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 3.0%CVSS: 5.5Exploit: Elevated riskExposed services: Not assessed

A fix is available — apply it.

esm.sh is a nobuild content delivery network(CDN) for modern web development. In 136 and earlier, a path-traversal flaw in the handling of the X-Zone-Id HTTP header allows an attacker to cause the application to write files outside the intended storage location. The header value is used to build a filesystem path but is not properly canonicalized or restricted to the application’s storage base directory. As a result, supplying ../ sequences in X-Zone-Id causes files to be written to arbitrary directories. Version 136.1 contains a patch.

CVSS v3
5.5
EG Score
5.5MEDIUMmedium confidence
EG Risk
56
EG Risk 56/100

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
Severity55% × 45%
Exploitation40% × 40%
Automatability100% × 15%
EPSS PROB
3.0%
EPSS %ILE
87th
KEV
Not listed

Published

September 17, 2025

Last Modified

April 15, 2026

References (4)

Affected Packages

(1 across 1 ecosystem)
Go(1)
PackageVulnerable rangeFix by version rangeDependents
github.com/esm-dev/esm.sh—
  • every version up to 136.1: fixed in 136.1
  • every version on: no fix on record
—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 8× in last 7d / 32× 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 201 total refreshes for this CVE.

  1. 2026-10-10 19:59 UTCEPSS rescore
  2. 2026-10-10 16:55 UTCOSV refresh
  3. 2026-10-09 20:06 UTCEPSS rescore
  4. 2026-10-08 17:10 UTCEPSS rescore
  5. 2026-10-07 23:47 UTCEPSS rescore
  6. 2026-10-06 15:17 UTCEPSS rescore
  7. 2026-10-05 17:42 UTCEPSS rescore
  8. 2026-10-04 23:21 UTCEPSS rescore
  9. 2026-10-03 14:24 UTCEPSS rescore
  10. 2026-10-01 19:49 UTCEPSS rescore
  11. 2026-10-01 19:49 UTCEPSS rescore
  12. 2026-09-30 15:02 UTCEPSS rescore
  13. 2026-09-28 13:50 UTCEPSS rescore
  14. 2026-09-26 15:58 UTCEPSS rescore
  15. 2026-09-26 15:58 UTCEPSS rescore
  16. 2026-09-26 00:25 UTCEPSS rescore
  17. 2026-09-24 14:02 UTCEPSS rescore
  18. 2026-09-23 13:47 UTCEPSS rescore
  19. 2026-09-21 21:06 UTCEPSS rescore
  20. 2026-09-21 03:49 UTCOSV refresh
  21. 2026-09-20 20:15 UTCEPSS rescore
  22. 2026-09-20 20:15 UTCEPSS rescore
  23. 2026-09-19 15:42 UTCEPSS rescore
  24. 2026-09-18 19:27 UTCEPSS rescore
  25. 2026-09-18 19:27 UTCEPSS rescore
Show 75 more
  1. 2026-09-17 19:29 UTCEPSS rescore
  2. 2026-09-16 14:07 UTCEPSS rescore
  3. 2026-09-16 05:14 UTCEPSS rescore
  4. 2026-09-13 16:46 UTCEPSS rescore
  5. 2026-09-12 15:00 UTCEPSS rescore
  6. 2026-09-11 14:52 UTCEPSS rescore
  7. 2026-09-11 09:36 UTCEPSS rescore
  8. 2026-09-10 09:34 UTCEPSS rescore
  9. 2026-09-08 21:59 UTCEPSS rescore
  10. 2026-09-07 16:00 UTCEPSS rescore
  11. 2026-09-06 13:47 UTCEPSS rescore
  12. 2026-09-05 15:28 UTCEPSS rescore
  13. 2026-09-04 05:06 UTCEPSS rescore
  14. 2026-09-02 14:11 UTCEPSS rescore
  15. 2026-09-02 01:58 UTCOSV refresh
  16. 2026-09-01 13:53 UTCEPSS rescore
  17. 2026-09-01 04:38 UTCEPSS rescore
  18. 2026-08-30 19:16 UTCEPSS rescore
  19. 2026-08-30 01:21 UTCEPSS rescore
  20. 2026-08-28 21:40 UTCEPSS rescore
  21. 2026-08-27 14:24 UTCEPSS rescore
  22. 2026-08-26 14:45 UTCEPSS rescore
  23. 2026-08-25 13:48 UTCEPSS rescore
  24. 2026-08-24 14:16 UTCEPSS rescore
  25. 2026-08-24 09:22 UTCEPSS rescore
  26. 2026-08-23 00:18 UTCEPSS rescore
  27. 2026-08-21 23:48 UTCEPSS rescore
  28. 2026-08-20 22:54 UTCEPSS rescore
  29. 2026-08-19 17:03 UTCEPSS rescore
  30. 2026-08-18 13:47 UTCEPSS rescore
  31. 2026-08-17 13:46 UTCEPSS rescore
  32. 2026-08-16 14:55 UTCEPSS rescore
  33. 2026-08-16 05:08 UTCOSV refresh
  34. 2026-08-16 02:13 UTCEPSS rescore
  35. 2026-08-15 01:29 UTCEPSS rescore
  36. 2026-08-13 21:59 UTCEPSS rescore
  37. 2026-08-12 13:50 UTCEPSS rescore
  38. 2026-08-12 13:50 UTCEPSS rescore
  39. 2026-08-11 13:42 UTCEPSS rescore
  40. 2026-08-10 23:59 UTCEPSS rescore
  41. 2026-08-09 13:46 UTCEPSS rescore
  42. 2026-08-08 16:36 UTCEPSS rescore
  43. 2026-08-07 16:26 UTCEPSS rescore
  44. 2026-08-06 13:46 UTCEPSS rescore
  45. 2026-08-05 19:16 UTCEPSS rescore
  46. 2026-08-04 15:09 UTCEPSS rescore
  47. 2026-08-04 15:09 UTCEPSS rescore
  48. 2026-08-04 10:37 UTCEPSS rescore
  49. 2026-08-03 10:35 UTCEPSS rescore
  50. 2026-08-02 02:26 UTCEPSS rescore
  51. 2026-08-01 04:15 UTCEPSS rescore
  52. 2026-07-31 22:42 UTCOSV refresh
  53. 2026-07-30 16:27 UTCEPSS rescore
  54. 2026-07-30 01:30 UTCEPSS rescore
  55. 2026-07-28 15:35 UTCEPSS rescore
  56. 2026-07-26 14:54 UTCEPSS rescore
  57. 2026-07-25 14:17 UTCEPSS rescore
  58. 2026-07-24 14:17 UTCEPSS rescore
  59. 2026-07-23 14:18 UTCEPSS rescore
  60. 2026-07-23 02:59 UTCEG score recompute
  61. 2026-07-22 14:08 UTCEPSS rescore
  62. 2026-07-22 14:07 UTCEPSS rescore
  63. 2026-07-21 15:24 UTCEPSS rescore
  64. 2026-07-20 17:08 UTCEPSS rescore
  65. 2026-07-19 14:30 UTCEPSS rescore
  66. 2026-07-19 14:30 UTCEPSS rescore
  67. 2026-07-19 02:28 UTCEPSS rescore
  68. 2026-07-18 10:04 UTCEPSS rescore
  69. 2026-07-16 17:02 UTCEPSS rescore
  70. 2026-07-15 16:57 UTCEPSS rescore
  71. 2026-07-15 16:57 UTCEPSS rescore
  72. 2026-07-15 01:59 UTCEPSS rescore
  73. 2026-07-15 01:59 UTCEPSS rescore
  74. 2026-07-14 05:55 UTCOSV refresh
  75. 2026-07-13 22:29 UTCEPSS rescore

Publicly available exploits

(2 references)

Public exploit code is referenced for this CVE (1 Exploit-DB entry), as is 1 Nuclei detection template. A detection template checks whether a system is affected; it is not necessarily exploit code. Defenders should treat patch urgency accordingly.

  • Nucleihttp/cves/2025/CVE-2025-59342.yaml
    Published Apr 17, 2026

    esm.sh <= v136 - Arbitrary File Write via Path Traversal

    Open source ↗
  • Exploit-DBEDB-52461
    Published Dec 16, 2025

    esm-dev 136 - Path Traversal

    Open source ↗

Related CVEs(same product + same CWE)

Frequently asked(5)

What is CVE-2025-59342?
CVE-2025-59342 is a medium vulnerability published on September 17, 2025. esm.sh is a nobuild content delivery network(CDN) for modern web development. In 136 and earlier, a path-traversal flaw in the handling of the X-Zone-Id HTTP header allows an attacker to cause the application to write files outside the intended storage location. The header value is used to build a…
When was CVE-2025-59342 disclosed?
CVE-2025-59342 was first published on September 17, 2025, with the most recent update on April 15, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2025-59342 actively exploited?
CVE-2025-59342 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 3.0% probability of exploitation in the next 30 days (87th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2025-59342?
CVE-2025-59342 has a CVSS v3 base score of 5.5 (NVD).
How do I remediate CVE-2025-59342?
A fix for CVE-2025-59342 is available: update to the fixed version the vendor names in its advisory.

Dependency Blast Radius

See which npm, PyPI, Go, and Maven packages are affected by CVE-2025-59342

Explore →

Is Your Infrastructure Affected by CVE-2025-59342?

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

Book a Demo →Browse All CVEs