PT-2026-59144 · Pypi · Flash-Attn

Published 2026-07-13 · Updated 2026-07-13

OSV

CVSS v3.1

7.3

High

Base vector

AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L

The flash-attention training framework thru commit e724e2588cbe754beb97cf7c011b5e7e34119e62 (2025-13-04) contains an insecure deserialization vulnerability (CWE-502) in its checkpoint loading mechanism. The load checkpoint() function in checkpoint.py and the checkpoint loading code in eval.py use torch.load() without enabling the security-restrictive weights only=True parameter. This allows the deserialization of arbitrary Python objects via the pickle module. An attacker can exploit this by providing a maliciously crafted checkpoint file. When a victim loads this checkpoint during model warmstarting or evaluation, arbitrary code is executed on the victim's system.

Fix

Related Identifiers

PYSEC-2026-2477

Affected Products

Flash-Attn

References · 6

• https://nvd.nist.gov/vuln/detail/CVE-2026-31253 · Security Note
• https://osv.dev/vulnerability/PYSEC-2026-2477 · Vendor Advisory
• https://github.com/Dao-AILab/flash-attention · Note
• https://pypi.org/project/flash-attn · Note
• https://github.com/advisories/GHSA-7g5w-pq96-8c5w · Note
• https://notion.so/CVE-2026-31253-35d1e1393188813f9e77e2038104bc49 · Note