What’s Vulnerable › Vulnerabilities

CVE-2026-94266: password leak in CURLINFO_EFFECTIVE_URL

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-10-20 · updated 2026-10-30
• Weakness: CWE-522

Description

libcurl could accidentally return a URL for `curl_easy_getinfo()`'s `CURLINFO_EFFECTIVE_URL` option containing credentials, even though neither the URL provided to libcurl nor the redirected URL did.

Affected products

• curl: from 8.22.0 through 8.22.0; from 8.21.0 through 8.21.0; from 8.20.0 through 8.20.0; from 8.19.0 through 8.19.0; from 8.18.0 through 8.18.0; from 8.17.0 through 8.17.0

References

• https://curl.se/docs/CVE-2026-94266.html
• https://curl.se/docs/CVE-2026-94266.json
• https://hackerone.com/reports/4041053
• https://hackerone.com/reports/4041053

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