CVE-2026-62239
5.3
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
Summary
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.
Affected Software
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| Dao-AILab | flash-attention | 0 <= 2.8.3.post1 | affected |
| Dao-AILab | flash-attention | 0816ef12f424c6ec94b057a72c275b14f6e6edb2 | unaffected |
Weaknesses
- CWE-59: Improper Link Resolution Before File Access ('Link Following')
References
- https://github.com/Dao-AILab/flash-attention/issues/2637
- https://github.com/Dao-AILab/flash-attention/pull/2702
- https://github.com/Dao-AILab/flash-attention/commit/0816ef12f424c6ec94b057a72c275b14f6e6edb2
- https://www.vulncheck.com/advisories/flashattention-symlink-attack-via-tarfile-extractall-in-hopper-setup-py
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