CVE Catalog

CVE-2026-62239

MediumCVSS 6.6
Published: Updated: Translated: NVD NIST

Exploitation Probability (EPSS)

Low risk
0.16%

6th percentile - higher than 6% of all known CVEs

Summary

A symlink attack vulnerability in FlashAttention through version 2.8.3.post1 (fixed in commit 0816ef1) exists in the download_and_copy() function within hopper/setup.py, which 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.

Risk Assessment

The risk is the potential overwriting of arbitrary files on the victim's system during the build process, which could lead to privilege escalation, malicious code injection, or persistent system compromise.

Recommendation

Immediately update FlashAttention to a version containing commit 0816ef1 or later. If an update is not possible, temporarily disable the download_and_copy() function or run the build process in an isolated environment (e.g., a container).

Related vulnerabilities

Original NVD description (English source)

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.

Vulnerability data from NVD (NIST) · CISA KEV · EPSS