CVE-2026-58166

CRITICALPre-NVD 9.19.1—
EchelonGraph scoreHIGH 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 — 4 sources updated this week
9.1
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 1%CVSS: 9.1Exploit: NoneExposed: 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(high)
EPSS
45.7%
KEV
Not listed

Published

June 30, 2026

Last Modified

July 2, 2026

Advisory Details (4)

Auto-updated Jun 30, 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 92× in last 7d / 92× 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.

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

Related CVEs(same CWE)

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 2, 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 45.7% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
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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