Summary
Package updates are available for Amazon Linux 2023 that fix the following vulnerabilities: CVE-2026-9669: bz2.BZ2Decompressor objects could be reused after a decompression error. If an application caught the resulting OSError and retried with the same decompressor, crafted input could cause the decompressor to resume from an invalid internal state and perform out-of-bounds writes to a stack buffer. This could crash the process when processing untrusted data. CVE-2026-3276: unicodedata.normalize() can take excessive CPU time when processing specially crafted Unicode input containing long runs of combining characters with alternating Canonical Combining Class values. This affects all normalization forms. CVE-2026-11972: When using the "tarfile" module with a file opened in "streaming mode" (mode="r|") the tarfile module did not properly handle EOF, making archive parsing take exponentially longer. CVE-2026-11940: tarfile.extractall() with the 'data' or 'tar' filter could be bypassed by a crafted archive where a hardlink references a symlink stored at a deeper name than the hardlink itself. The extraction fallback validated the symlink at it's archived location but recreated it at the hardlink's shallower path, letting a relative target the filter judged contained escape the destination directory. This allowed a malicious tar archive to create a symlink pointing outside the destination, enabling out-of-destination file reads or writes. This was an incomplete fix of CVE-2025-4330. CVE-2026-0864: When using the "configparser" module to write configuration files containing multi-line text values with carriage return characters (\r) the resulting file could be injected with unexpected keys and values if the attacker controls the written value.
Fixed packages 10
| Release | Package | Fixed in |
|---|---|---|
| Amazon Linux · 2023 | python-unversioned-command | 0:3.9.25-1.amzn2023.0.8 |
| Amazon Linux · 2023 | python3 | 0:3.9.25-1.amzn2023.0.8 |
| Amazon Linux · 2023 | python3-debug | 0:3.9.25-1.amzn2023.0.8 |
| Amazon Linux · 2023 | python3-devel | 0:3.9.25-1.amzn2023.0.8 |
| Amazon Linux · 2023 | python3-idle | 0:3.9.25-1.amzn2023.0.8 |
| Amazon Linux · 2023 | python3-libs | 0:3.9.25-1.amzn2023.0.8 |
| Amazon Linux · 2023 | python3-test | 0:3.9.25-1.amzn2023.0.8 |
| Amazon Linux · 2023 | python3-tkinter | 0:3.9.25-1.amzn2023.0.8 |
| Amazon Linux · 2023 | python3.9-debuginfo | 0:3.9.25-1.amzn2023.0.8 |
| Amazon Linux · 2023 | python3.9-debugsource | 0:3.9.25-1.amzn2023.0.8 |
Vulnerabilities 5
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High 8.2
tarfile opened in streaming mode mishandles EOF
When using the "tarfile" module with a file opened in "streaming mode" (mode="r|") the tarfile module did not properly handle EOF, making archive parsing take exponentially longer.
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High 8.2
bz2.BZ2Decompressor reuse after error can cause a stack buffer overflow
bz2.BZ2Decompressor objects could be reused after a decompression error. If an application caught the resulting OSError and retried with the same decompressor, crafted input could cause the decompressor to resume from an invalid internal state and perform out…
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High 7.8
tarfile extraction filter bypass allows escaping the destination directory
tarfile.extractall() with the 'data' or 'tar' filter could be bypassed by a crafted archive where a hardlink references a symlink stored at a deeper name than the hardlink itself. The extraction fallback validated the symlink at it's archived location but re…
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Medium 6.3
Potential DoS via quadratic complexity in unicodedata.normalize()
unicodedata.normalize() can take excessive CPU time when processing specially crafted Unicode input containing long runs of combining characters with alternating Canonical Combining Class values. This affects all normalization forms.
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Medium 4.1
Configuration Injection via Carriage Return (\r) in write() method
When using the "configparser" module to write configuration files containing multi-line text values with carriage return characters (\r) the resulting file could be injected with unexpected keys and values if the attacker controls the written value.
References
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web
https://alas.aws.amazon.com/cve/html/CVE-2026-0864.html
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web
https://alas.aws.amazon.com/cve/html/CVE-2026-11940.html
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web
https://alas.aws.amazon.com/cve/html/CVE-2026-11972.html
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web
https://alas.aws.amazon.com/cve/html/CVE-2026-3276.html
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web
https://alas.aws.amazon.com/cve/html/CVE-2026-9669.html