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Vulnerabilities CVE-2026-62239

CVE-2026-62239

Medium
Open
TLP:CLEAR

FlashAttention Symlink Attack via tarfile.extractall in hopper/setup.py

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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.

Details

CVSS Score
5.3
EPSS Score
0.13%

2.9th percentile

CVSS 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
Confidence
90%
Published
Jul 13, 2026
Last Modified
Jul 14, 2026
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