What’s Vulnerable › Vulnerabilities

CVE-2026-86410: redirect to SFTP or SCP bypasses host verification

• Severity: high (CVSS 8.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.8% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-10-20 · updated 2026-10-29
• Weakness: CWE-297

Description

A flaw in the curl command line tool's logic makes it only set SSH host verification options when interacting directly using SFTP or SCP, and not as a result of following a redirect.

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-2026-86410.html
• https://curl.se/docs/CVE-2026-86410.json
• https://hackerone.com/reports/3973176
• https://hackerone.com/reports/3973176

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