Link Preview JS: vunerable to IPv6 and internal loopback attacks
Priority MEDIUM 45CWE-918Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Attack requirements
- None
- Impact type
- Information disclosure
- Confidentiality · integrity · availability
- High · None · None
- Fix status
- Fixed
Attack profile from CVSS 4.0 · CNA. Fix status from CNA and GitHub. Impact type from CWE-918 and the CVSS impact.
Summary
Link Preview JS extracts web links information. Prior to 4.0.1, the library did not check for IPv6 loopback attacks. There was also a DNS attack, where an address could be resolved into an internal IP. This could cause internal data leaks. This vulnerability is fixed in 4.0.1.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00654 51st percentileScored 2026-11-07
Fix Fixed link-preview-js (OP-Engineering): 4.0.1link-preview-js (npm): 4.0.1
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- Yes
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| OP-Engineering | link-preview-js | before 4.0.1 | 4.0.1 | Patch available | CNA |
| — | link-preview-js (npm) | before 4.0.1 | 4.0.1 | Patch available | GHSA-4gp8-rjrq-ch6q |
- link-preview-js VendorOP-Engineering Affected before 4.0.1 Fixed in 4.0.1 Patch available CNA
- link-preview-js (npm) Vendor— Affected before 4.0.1 Fixed in 4.0.1 Patch available GHSA-4gp8-rjrq-ch6q
Remediation
- Fix · CNA link-preview-js (OP-Engineering) Fixed in 4.0.1
- Fix · GHSA-4gp8-rjrq-ch6q link-preview-js (npm) Fixed in 4.0.1 Advisory →
Timeline
- 2026-10-02 Threatist record created from CVE-2026-43897
- 2026-10-03 Alias added: GHSA-4gp8-rjrq-ch6q
- 2026-10-25 EPSS moved to the 50th–90th percentile
References
Other 5
- https://github.com/OP-Engineering/link-preview-js/security/advisories/GHSA-4gp8-rjrq-ch6q
- https://github.com/OP-Engineering/link-preview-js/pull/179
- https://github.com/OP-Engineering/link-preview-js/commit/4396d48909fab37553c0e93e26447fe218363ede
- https://github.com/OP-Engineering/link-preview-js/releases/tag/4.0.1
- https://github.com/OP-Engineering/link-preview-js
More OP-Engineering vulnerabilities
- TI-2026-44172 link-preview-js DNS Rebinding SSRF Bypass / Incomplete Fix for CVE-2026-43897 CVSS 3.1HIGH 7.5
Sources
- CVE-2026-43897 · CVE Program
- CVE-2026-43897 · NVD
- FIRST EPSS
- GHSA-4gp8-rjrq-ch6q · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences