Amazon Linux 2023 Security Advisory: ALAS2023-2026-2125
Advisory Released Date: 2026-08-31
Advisory Updated Date: 2026-08-31
Severity:
Low
Issue Overview:
Attacker-controlled CSV samples can trigger super-linear regular-expression work during dialect sniffing and consume significant CPU when applications pass unbounded input to csv.Sniffer.sniff(). (CVE-2026-18503)
`Element.findall()` and fully-consumed `Element.iterfind()` exhibit `O(n^2)` time complexity when using XPath index predicates (e.g. `[1]`, `[last()]`, `[last()-N]`) on XML documents with many same-tag siblings. `Element.find()` is only affected when the first match is near the end of the sibling list, such as with `[last()]` or `[last()-N]`; `.//item[1]` short-circuits after the first match. (CVE-2026-6879)
Affected Packages:
python3.11
Issue Correction:
Run dnf update python3.11 --releasever 2023.12.20260831 or dnf update --advisory ALAS2023-2026-2125 --releasever 2023.12.20260831 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:
python3.11-tkinter-3.11.16-1.amzn2023.0.1.aarch64
python3.11-debug-3.11.16-1.amzn2023.0.1.aarch64
python3.11-idle-3.11.16-1.amzn2023.0.1.aarch64
python3.11-debugsource-3.11.16-1.amzn2023.0.1.aarch64
python3.11-3.11.16-1.amzn2023.0.1.aarch64
python3.11-devel-3.11.16-1.amzn2023.0.1.aarch64
python3.11-debuginfo-3.11.16-1.amzn2023.0.1.aarch64
python3.11-libs-3.11.16-1.amzn2023.0.1.aarch64
python3.11-test-3.11.16-1.amzn2023.0.1.aarch64
src:
python3.11-3.11.16-1.amzn2023.0.1.src
x86_64:
python3.11-devel-3.11.16-1.amzn2023.0.1.x86_64
python3.11-idle-3.11.16-1.amzn2023.0.1.x86_64
python3.11-3.11.16-1.amzn2023.0.1.x86_64
python3.11-tkinter-3.11.16-1.amzn2023.0.1.x86_64
python3.11-debugsource-3.11.16-1.amzn2023.0.1.x86_64
python3.11-debug-3.11.16-1.amzn2023.0.1.x86_64
python3.11-debuginfo-3.11.16-1.amzn2023.0.1.x86_64
python3.11-libs-3.11.16-1.amzn2023.0.1.x86_64
python3.11-test-3.11.16-1.amzn2023.0.1.x86_64