CVE-2026-123201 buku through 5.1.1 SSRF via bukuserver fetch_data and network_handle API
- Exploited in the wild
- Not known
- Fix
- None listed
What is CVE-2026-123201?
CVE-2026-123201 is a medium-severity vulnerability in jarun buku, published on 5 Nov 2026.
Official description
Buku (bukuserver) through 5.1.1 contains an unauthenticated server-side request forgery vulnerability that allows remote attackers to make the server request internal hosts by supplying a url parameter to /api/fetch_data or /api/network_handle. Attackers can target loopback, private, or cloud metadata IP addresses, which pass the weak is_bad_url() check and follow redirects, to discover internal services and read their page titles, descriptions, and keywords.
Weakness: CWE-918
Which versions are affected by CVE-2026-123201?
How do I fix CVE-2026-123201?
No fix has been published for CVE-2026-123201 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-123201 being exploited?
There is no known exploitation of CVE-2026-123201 in the wild and no public exploit code.
Sources
Also known as GHSA-jrwq-3w4r-c27c.