GHSA-cpjf-6666-r8fx

Suggest an improvement
Source
https://github.com/advisories/GHSA-cpjf-6666-r8fx
Import Source
https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/09/GHSA-cpjf-6666-r8fx/GHSA-cpjf-6666-r8fx.json
JSON Data
https://api.osv.dev/v1/vulns/GHSA-cpjf-6666-r8fx
Aliases
Published
2026-09-02T21:29:57Z
Modified
2026-09-02T21:45:09Z
Severity
  • 7.5 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N CVSS Calculator
Summary
link-preview-js DNS Rebinding SSRF Bypass / Incomplete Fix for CVE-2026-43897
Details

The existing advisory GHSA-4gp8-rjrq-ch6q / CVE-2026-43897 states that the SSRF issue was fixed in 4.0.1. However, 4.0.3 remains bypassable when the documented resolveDNSHost mitigation is used.

Root cause: The library validates one resolved IP address through resolveDNSHost, but later performs fetch() against the original hostname without pinning the connection to the validated IP. An attacker-controlled DNS server can return a public IP during validation and a loopback/internal IP during the final connection.

Impact: This allows an attacker to bypass the documented SSRF mitigation and make the server-side fetch reach loopback or internal addresses under DNS rebinding conditions.

This appears to be either an incomplete fix for CVE-2026-43897 or a new DNS rebinding SSRF bypass affecting the latest version.

The PoC was reproduced in a local-only controlled environment to avoid targeting production or third-party systems. Evidence and reproduction details can be provided privately.

Database specific 
{
    "cwe_ids": [
        "CWE-918"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-09-02T21:29:57Z",
    "nvd_published_at": "2026-08-20T17:18:51Z",
    "severity": "HIGH"
}
References

Affected packages

npm / link-preview-js

Package

Name
link-preview-js
View open source insights on deps.dev
Purl
pkg:npm/link-preview-js

Affected ranges

Type
SEMVER
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
4.0.4

Database specific

last_known_affected_version_range 
"<= 4.0.3"
source 
"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/09/GHSA-cpjf-6666-r8fx/GHSA-cpjf-6666-r8fx.json"