Amazon Linux 2023 Security Advisory: ALAS2023-2026-1663
Advisory Released Date: 2026-05-14
Advisory Updated Date: 2026-05-14
Severity:
Medium
Issue Overview:
An undocumented and unsafe feature in the PLY (Python Lex-Yacc) library 3.11 allows Remote Code Execution (RCE) via the `picklefile` parameter in the `yacc()` function. This parameter accepts a `.pkl` file that is deserialized with `pickle.load()` without validation. Because `pickle` allows execution of embedded code via `__reduce__()`, an attacker can achieve code execution by passing a malicious pickle file. The parameter is not mentioned in official documentation or the GitHub repository, yet it is active in the PyPI version. This introduces a stealthy backdoor and persistence risk. (CVE-2025-56005)
Affected Packages:
policycoreutils
Issue Correction:
Run dnf update policycoreutils --releasever 2023.11.20260511 or dnf update --advisory ALAS2023-2026-1663 --releasever 2023.11.20260511 to update your system.
More information on how to update your system can be found on this page: Amazon Linux 2023 documentation
New Packages:
aarch64:
policycoreutils-devel-debuginfo-3.4-6.amzn2023.0.3.aarch64
policycoreutils-newrole-debuginfo-3.4-6.amzn2023.0.3.aarch64
policycoreutils-restorecond-debuginfo-3.4-6.amzn2023.0.3.aarch64
policycoreutils-devel-3.4-6.amzn2023.0.3.aarch64
policycoreutils-debuginfo-3.4-6.amzn2023.0.3.aarch64
policycoreutils-newrole-3.4-6.amzn2023.0.3.aarch64
policycoreutils-debugsource-3.4-6.amzn2023.0.3.aarch64
policycoreutils-restorecond-3.4-6.amzn2023.0.3.aarch64
policycoreutils-3.4-6.amzn2023.0.3.aarch64
noarch:
python3-policycoreutils-3.4-6.amzn2023.0.3.noarch
policycoreutils-dbus-3.4-6.amzn2023.0.3.noarch
policycoreutils-gui-3.4-6.amzn2023.0.3.noarch
policycoreutils-python-utils-3.4-6.amzn2023.0.3.noarch
src:
policycoreutils-3.4-6.amzn2023.0.3.src
x86_64:
policycoreutils-newrole-3.4-6.amzn2023.0.3.x86_64
policycoreutils-debugsource-3.4-6.amzn2023.0.3.x86_64
policycoreutils-newrole-debuginfo-3.4-6.amzn2023.0.3.x86_64
policycoreutils-devel-debuginfo-3.4-6.amzn2023.0.3.x86_64
policycoreutils-restorecond-debuginfo-3.4-6.amzn2023.0.3.x86_64
policycoreutils-devel-3.4-6.amzn2023.0.3.x86_64
policycoreutils-restorecond-3.4-6.amzn2023.0.3.x86_64
policycoreutils-3.4-6.amzn2023.0.3.x86_64
policycoreutils-debuginfo-3.4-6.amzn2023.0.3.x86_64