What is CVE-2026-49991?

CVE-2026-49991 is a high-severity vulnerability in Rustfs, classified under Path Traversal. CVSS score: 8.6/10. Published 2026-06-26.

How severe is CVE-2026-49991?

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

Auth bypass in Rustfs

CVE-2026-49991

RustFS is a distributed object storage system built in Rust. In 1.0.0-beta.4, authenticated users with only PutObject permission on their own bucket can exploit a path traversal vulnerability in the Snowball auto-extract feature to write a…

Vulnerability class: Path Traversal (Directory Traversal)

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:N/I:H/A:N.

Affected products

Rustfs — versions 1.0.0-beta.4

Weakness classification (CWE)

CWE-22 — Path Traversal
CWE-862 — Missing Authorization

References

security-advisories@github.com (x_refsource_CONFIRM)

Frequently asked questions

What is CVE-2026-49991?: CVE-2026-49991 is a high-severity vulnerability in Rustfs, classified under Path Traversal. CVSS score: 8.6/10. Published 2026-06-26.
How severe is CVE-2026-49991?: High severity. CVSS v3 base score is 8.6 out of 10.