What is CVE-2026-75856?

CVE-2026-75856 is a high-severity vulnerability in Hmbown Codewhale, classified under Server-Side Request Forgery (SSRF). CVSS score: 8.6/10. Published 2026-08-18.

How severe is CVE-2026-75856?

High severity. CVSS v3 base score is 8.6 out of 10.

SSRF in Hmbown Codewhale

CVE-2026-75856

CodeWhale before 0.8.64 contains a server-side request forgery bypass vulnerability in DNS pinning logic that fails to prevent time-of-check-time-of-use attacks. Attackers can manipulate DNS responses to fail initial resolution checks and succeed on secondary requests, allowing requests to internal IP addresses and bypassing SSRF mitigations.

Vulnerability class: SSRF (Server-Side Request Forgery)

CVSS v3 metric

CVSS v3 base score 8.6 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N.

Affected products

Hmbown Codewhale

Weakness classification (CWE)

CWE-918 — Server-Side Request Forgery (SSRF)

References

GitHub Security Advisory (GHSA-6v2g-fpxh-pmmh) (vendor-advisory)
Patch Commit (patch)
VulnCheck Advisory: CodeWhale before 0.8.64 SSRF Bypass via DNS Pinning TOCTOU (third-party-advisory)

Frequently asked questions

What is CVE-2026-75856?: CVE-2026-75856 is a high-severity vulnerability in Hmbown Codewhale, classified under Server-Side Request Forgery (SSRF). CVSS score: 8.6/10. Published 2026-08-18.
How severe is CVE-2026-75856?: High severity. CVSS v3 base score is 8.6 out of 10.