What is CVE-2026-75859?

CVE-2026-75859 is a high-severity vulnerability in Hmbown Codewhale, classified under Path Traversal. CVSS score: 7.5/10. Published 2026-08-18.

How severe is CVE-2026-75859?

High severity. CVSS v3 base score is 7.5 out of 10.

Path Traversal in Hmbown Codewhale

CVE-2026-75859

CodeWhale versions before 0.8.64 fail to validate file paths in the project config instructions field, allowing attackers to read arbitrary files on the victim's system. A malicious .codewhale/config.toml file in a cloned repository can specify paths outside the workspace that are read and injected into the AI system prompt for exfiltration.

Vulnerability class: Path Traversal (Directory Traversal)

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

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N.

EPSS exploit prediction

EPSS: 0.005 (42.8th percentile), scored 2026-10-03.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 43rd percentile — 42.8% 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-22 — Path Traversal

References

github.com/Hmbown/CodeWhale/security/advisories/GHSA-62f5-cp2p-vq95 (vendor-advisory)
github.com/Hmbown/CodeWhale/commit/43563356b98c6b993085554da82e77370160a31c (patch)
www.vulncheck.com/advisories/codewhale-before-arbitrary-file-read-via-instructi… (third-party-advisory)

Frequently asked questions

What is CVE-2026-75859?: CVE-2026-75859 is a high-severity vulnerability in Hmbown Codewhale, classified under Path Traversal. CVSS score: 7.5/10. Published 2026-08-18.
How severe is CVE-2026-75859?: High severity. CVSS v3 base score is 7.5 out of 10.