What is CVE-2026-62239?

CVE-2026-62239 is a medium-severity vulnerability in Dao-ailab Flash-attention, classified under Improper Link Resolution Before File Access. CVSS score: 6.6/10. Published 2026-07-13.

How severe is CVE-2026-62239?

Medium severity. CVSS v3 base score is 6.6 out of 10.

Vulnerability in Dao-ailab Flash-attention

CVE-2026-62239

FlashAttention through 2.8.3.post1, fixed in commit 0816ef1, contains a symlink attack vulnerability in the download_and_copy() function within hopper/setup.py that extracts NVIDIA toolchain archives without validating symlinks or filterin…

CVSS v3 metric

CVSS v3 base score 6.6 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:N.

Affected products

Dao-ailab Flash-attention — versions 0, 0816ef12f424c6ec94b057a72c275b14f6e6edb2

Weakness classification (CWE)

CWE-59 — Improper Link Resolution Before File Access

References

disclosure@vulncheck.com (technical-description, exploit)
disclosure@vulncheck.com (issue-tracking)
disclosure@vulncheck.com (patch)
disclosure@vulncheck.com (third-party-advisory)

Frequently asked questions

What is CVE-2026-62239?: CVE-2026-62239 is a medium-severity vulnerability in Dao-ailab Flash-attention, classified under Improper Link Resolution Before File Access. CVSS score: 6.6/10. Published 2026-07-13.
How severe is CVE-2026-62239?: Medium severity. CVSS v3 base score is 6.6 out of 10.