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CVE-2026-77804 Time-of-check Time-of-use (TOCTOU) Race Condition in Root Certificate Installation in Progress® Telerik® Fiddler® Classic

🗓️ 05 Oct 2026 12:40:26Reported by ProgressSoftwareType 
cvelist
 cvelist
🔗 www.cve.org👁 7 Views

TOCTOU race condition in Fiddler Classic on Windows allows installation of root certificates.

Related
Affected
Refs
ReporterTitlePublishedViews
Family
cve
CVE
CVE-2026-77804
5 Oct 202612:40
–cve
euvd
EUVD
EUVD-2026-92427
5 Oct 202612:40
–euvd
nvd
NVD
CVE-2026-77804
5 Oct 202613:16
–nvd
ptsecurity
Positive Technologies
PT-2026-105989
5 Oct 202600:00
–ptsecurity
[
  {
    "vendor": "Progress Software",
    "product": "Progress® Telerik® Fiddler® Classic",
    "platforms": [
      "Windows"
    ],
    "versions": [
      {
        "status": "affected",
        "version": "1.0.0",
        "lessThan": "6.0.20262.10021",
        "versionType": "custom"
      }
    ],
    "defaultStatus": "unaffected"
  }
]

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