CVE-2026-123201: jarun buku · Server-Side Request Forgery (SSRF)
Affects jarun bukuSource CVE Database V5
Not known to be exploited · CVSS 6.3 Medium.
Data as of 5 Nov 2026, 20:18 UTC
Thin evidence
One scorer or none| CNA (VulnCheck) | CVSS 4.0 | 6.3 |
|---|---|---|
| CNA (VulnCheck) | CVSS 3.1 | 5.3 |
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:L/SI:N/SA:NExploitation evidence
Disclosed: evidence found.
CVE published 5 Nov 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors
A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 5 Nov 2026.
What to do
Affected software
| Product | Affected | Fixed in |
|---|---|---|
| jarunbuku | Affected
| Fixed in– |
PyPIbukupkg:pypi/bukuOther threats | Affected
| Fixed in– |
Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.
AI-suggested
Until a fix is available, users should consider restricting access to the affected API endpoints or implementing stronger URL validation to prevent SSRF. Monitor vendor communications for updates and apply patches promptly once released.
Description
Buku (bukuserver) versions up to 5.1.1 have an unauthenticated server-side request forgery (SSRF) vulnerability. This flaw allows remote attackers to supply a URL parameter to specific API endpoints, causing the server to make requests to internal hosts, including loopback, private, or cloud metadata IP addresses. The vulnerability arises because the is_bad_url() check is weak and redirects are followed, enabling attackers to discover internal services and extract metadata such as page titles, descriptions, and keywords.
References
- github.com/jarun/buku/issues/910 (opens in a new tab)
- github.com/jarun/buku/pull/916 (opens in a new tab)
- github.com/jarun/buku/commit/13f6497afc974f02f1069b760772abe8815d1675 (opens in a new tab)
- github.com/jarun/buku/blob/e232ac357cbba22fe69d6d6dfc0d35512a4cd313/bukuserver/api.py (opens in a new tab)
- github.com/jarun/buku/blob/e232ac357cbba22fe69d6d6dfc0d35512a4cd313/buku.py (opens in a new tab)
- vulncheck.com/advisories/buku-through-5.1.1-ssrf-via-bukuserver-fetch-data-and-network-handle-api (opens in a new tab)