UBUNTU-CVE-2026-86410

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Source
https://ubuntu.com/security/CVE-2026-86410
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-86410.json
JSON Data
https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-86410
Upstream
  • CVE-2026-86410
Downstream
Related
Published
2026-10-14T06:00:00Z
Modified
2026-10-17T13:01:13Z
Severity
  • Ubuntu - low
Summary
[none]
Details

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. This means --knownhosts, --hostpubsha256, and --hostpubmd5 are never installed when the initial URL is HTTPS. If --location and --proto-redir +sftp is used and the server returns a Location: sftp://example.com redirect, the SFTP connection proceeds without any of the user's requested SSH host verification methods.

References

Affected packages

Ubuntu:26.10 / curl

Package

Name
curl
Purl
pkg:deb/ubuntu/curl?arch=source&distro=stonking

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected

Affected versions

8.*
8.18.0-1ubuntu2
8.20.0-2ubuntu1
8.20.0-2ubuntu3
8.20.0-2ubuntu10
8.20.0-2ubuntu11

Ecosystem specific 

{
    "binaries":  [
        {
            "binary_name":  "curl",
            "binary_version":  "8.20.0-2ubuntu11"
        },
        {
            "binary_name":  "libcurl3t64-gnutls",
            "binary_version":  "8.20.0-2ubuntu11"
        },
        {
            "binary_name":  "libcurl4t64",
            "binary_version":  "8.20.0-2ubuntu11"
        }
    ],
    "priority_reason":  "Upstream defined this as low severity"
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-86410.json"

Ubuntu:26.04:LTS / curl

Package

Name
curl
Purl
pkg:deb/ubuntu/curl?arch=source&distro=resolute

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
8.18.0-1ubuntu2.8

Affected versions

8.*
8.14.1-2ubuntu1
8.17.0-1ubuntu1
8.18.0-1ubuntu1
8.18.0-1ubuntu2
8.18.0-1ubuntu2.1
8.18.0-1ubuntu2.2
8.18.0-1ubuntu2.3
8.18.0-1ubuntu2.4
8.18.0-1ubuntu2.5
8.18.0-1ubuntu2.7

Ecosystem specific 

{
    "availability":  "No subscription required",
    "binaries":  [
        {
            "binary_name":  "curl",
            "binary_version":  "8.18.0-1ubuntu2.8"
        },
        {
            "binary_name":  "libcurl3t64-gnutls",
            "binary_version":  "8.18.0-1ubuntu2.8"
        },
        {
            "binary_name":  "libcurl4t64",
            "binary_version":  "8.18.0-1ubuntu2.8"
        }
    ],
    "priority_reason":  "Upstream defined this as low severity"
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-86410.json"