PIL.ImageMath.eval in Pillow before 9.0.0 allows evaluation of arbitrary expressions, such as ones that use the Python exec method ImageMath.eval("exec(exit())").

While Pillow 9.0.0 restricted top-level builtins available to PIL.ImageMath.eval(), it did not prevent builtins available to lambda expressions. These are now also restricted in 9.0.1.

References

• https://nvd.nist.gov/vuln/detail/CVE-2022-22817
• https://pillow.readthedocs.io/en/stable/releasenotes/9.0.0.html#restrict-builtins-available-to-imagemath-eval
• https://lists.debian.org/debian-lts-announce/2022/01/msg00018.html
• https://www.debian.org/security/2022/dsa-5053
• python-pillow/Pillow@8531b01
• https://pillow.readthedocs.io/en/stable/releasenotes/9.0.1.html#security
• https://security.gentoo.org/glsa/202211-10
• https://lists.debian.org/debian-lts-announce/2024/03/msg00021.html