CVE-2026-62239 — FlashAttention Symlink Attack via tarfile.extractall in hopper/setup.py
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 NVI…
Published: 2026-07-13 · CVSS: 5.3 · CVSS 4.0
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.
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7