CVE-2026-58166

CRITICALPre-NVD 9.19.1—
EchelonGraph scoreMEDIUM confidence

Score 9.1 from GitHub Security Advisory (severity: HIGH) published 2026-06-30. a secondary CVSS source baseline 9.1; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this weekElevated
9.1EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 9.1Exploit: Elevated riskExposed: 0

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

OpenBMB ChatDev through 2.2.0, fixed in commit 4fd4da6, contains a path traversal vulnerability that allows unauthenticated remote attackers to write or delete arbitrary files by supplying a malicious multipart filename in the file upload endpoint. Attackers can send a crafted filename containing path traversal sequences or an absolute path to the POST uploads session endpoint, which constructs the destination path without sanitization in save_upload_file, causing file write and cleanup operations to target attacker-chosen paths on the server filesystem.

CVSS v3
9.1
EG Score
9.1(medium)
EG Risk
72(Attend)
EG Risk 72/100SSVC: Attend

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
Severity91% × 45%
Exploitation40% × 40%
Automatability100% × 15%
Action: Remediate soon — notable exploitation risk.
EPSS PROB
1%
EPSS %ILE
56%
KEV
Not listed

Published

June 30, 2026

Last Modified

July 14, 2026

Advisory Details (4)

Auto-updated Sep 7, 2026
Upstream fix merged — awaiting tagged release. Sources: github_commit, github_pr.
generic

OpenBMB ChatDev - Unauthenticated Path Traversal in Upload Handler Allows Arbitrary File Write and Delete | Advisories | VulnCheck

https://www.vulncheck.com/advisories/openbmb-chatdev-unauthenticated-path-traversal-in-upload-handler-allows-arbitrary-file-write-and-delete
github_pr

fix: sanitize upload filename to prevent path traversal (#638)

Fix merged in OpenBMB/ChatDev PR #641 on 2026-06-29 — awaiting tagged release

https://github.com/OpenBMB/ChatDev/pull/641
generic

Arbitrary file write and delete via unsanitized upload filename in the ChatDev workflow server · Issue #638 · OpenBMB/ChatDev · GitHub

https://github.com/OpenBMB/ChatDev/issues/638
github_commit

commit 4fd4da603801 (OpenBMB/ChatDev)

Fix landed in OpenBMB/ChatDev commit 4fd4da603801 — awaiting tagged release

https://github.com/OpenBMB/ChatDev/commit/4fd4da603801766b14ad8788649cfc1ad21f99a6

Vendor Advisories for CVE-2026-58166(1)

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

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 7× in last 7d / 110× 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 390 total refreshes for this CVE.

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

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Frequently asked(5)

What is CVE-2026-58166?
CVE-2026-58166 is a critical vulnerability published on June 30, 2026. OpenBMB ChatDev through 2.2.0, fixed in commit 4fd4da6, contains a path traversal vulnerability that allows unauthenticated remote attackers to write or delete arbitrary files by supplying a malicious multipart filename in the file upload endpoint. Attackers can send a crafted filename containing…
When was CVE-2026-58166 disclosed?
CVE-2026-58166 was first published in the National Vulnerability Database on June 30, 2026, with the most recent update on July 14, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-58166 actively exploited?
CVE-2026-58166 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1% probability of exploitation in the next 30 days, which ranks it in the top 43.8% of all scored CVEs.
What is the CVSS score of CVE-2026-58166?
CVE-2026-58166 has a CVSS v3 base score of 9.1 (NVD).
How do I remediate CVE-2026-58166?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-58166, 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.

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