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)

Published 2026-08-18 · last modified 2026-09-08.

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.

EPSS exploit prediction

EPSS: 0.005 (40.2th percentile), scored 2026-10-03.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 40th percentile — 40.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.004 · newest: 0.005 · change: +0.001

Affected products

Hmbown Codewhale

Weakness classification (CWE)

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

References

github.com/Hmbown/CodeWhale/security/advisories/GHSA-6v2g-fpxh-pmmh (vendor-advisory)
github.com/Hmbown/CodeWhale/commit/26de44a8bd5051f8f944ea60b2c37ae1d2b7d25e (patch)
www.vulncheck.com/advisories/codewhale-before-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.