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 filtering tar members. A local attacker can pre-plant a symlink in the predictable cache directory to redirect extracted binaries to an attacker-chosen location, enabling arbitrary file write with victim privileges during build time.
Advisories

No advisories yet.

Fixes

Solution

No solution given by the vendor.


Workaround

No workaround given by the vendor.

History

Tue, 14 Jul 2026 13:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'poc', 'Technical Impact': 'total'}, 'version': '2.0.3'}


Tue, 14 Jul 2026 00:00:00 +0000

Type Values Removed Values Added
First Time appeared Dao-ailab
Dao-ailab flash-attention
Vendors & Products Dao-ailab
Dao-ailab flash-attention

Mon, 13 Jul 2026 21:30:00 +0000

Type Values Removed Values Added
Description 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 filtering tar members. A local attacker can pre-plant a symlink in the predictable cache directory to redirect extracted binaries to an attacker-chosen location, enabling arbitrary file write with victim privileges during build time.
Title FlashAttention Symlink Attack via tarfile.extractall in hopper/setup.py
Weaknesses CWE-59
References
Metrics cvssV3_1

{'score': 6.6, 'vector': 'CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:N'}

cvssV4_0

{'score': 5.3, 'vector': 'CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:P/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N'}


Projects

Sign in to view the affected projects.

cve-icon MITRE

Status: PUBLISHED

Assigner: VulnCheck

Published:

Updated: 2026-07-14T12:53:45.093Z

Reserved: 2026-07-13T16:41:09.007Z

Link: CVE-2026-62239

cve-icon Vulnrichment

Updated: 2026-07-14T12:53:36.510Z

cve-icon NVD

Status : Deferred

Published: 2026-07-13T22:16:51.967

Modified: 2026-07-15T21:02:13.570

Link: CVE-2026-62239

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-07-31T11:30:05Z

Weaknesses