Serhiy Storchaka

**Name of the Vulnerable Software and Affected Versions** CPython (affected versions not specified) **Description** The incremental HTML parser `html.parser.HTMLParser` contains an issue that allows for CPU denial-of-service when processing uncontrolled data. The root cause is improper input handling that leads to pathological parsing behavior, specifically algorithmic complexity and resource exhaustion, when markup declarations are repeatedly left unterminated. An attacker can exploit this by providing crafted HTML to any service or pipeline using `HTMLParser`, which can result in CPU core exhaustion and the degradation or complete failure of affected applications. **Recommendations** At the moment, there is no information about a newer version that contains a fix for this vulnerability.

**Name of the Vulnerable Software and Affected Versions** Python (affected versions not specified) **Description** `bz2.BZ2Decompressor` objects can be reused following a decompression error. If an application catches the resulting `OSError` and attempts to retry using the same decompressor, specially crafted input may cause the decompressor to resume from an invalid internal state. This leads to out-of-bounds writes to a stack buffer, which can result in a process crash when processing untrusted data. **Recommendations** At the moment, there is no information about a newer version that contains a fix for this vulnerability.

**Name of the Vulnerable Software and Affected Versions** Python (affected versions not specified) **Description** The `unicodedata.normalize()` function can consume excessive CPU time when processing specially crafted Unicode input. This occurs when the input contains long sequences of combining characters with alternating Canonical Combining Class values, affecting all normalization forms. **Recommendations** At the moment, there is no information about a newer version that contains a fix for this vulnerability.

**Name of the Vulnerable Software and Affected Versions** CPython (affected versions not specified) **Description** On Windows, the `shutil.unpack archive()` function fails to properly check for absolute paths within ZIP archives. If an archive contains a path with a drive letter (e.g., `C:`), files may be extracted outside of the intended target directory. **Recommendations** At the moment, there is no information about a newer version that contains a fix for this vulnerability.

Name of the Vulnerable Software and Affected Versions Base64 (affected versions not specified) Description The decoding process using `base64.b64decode()` or related functions would halt upon encountering the first padded quad, even if additional data remained. This could result in the acceptance of data that might be handled differently by other implementations. Using "validate=True" enables stricter base64 data processing. Recommendations Utilize "validate=True" when calling `base64.b64decode()` or related functions to enforce stricter base64 data processing.

**Name of the Vulnerable Software and Affected Versions** Python versions prior to 2.3 **Description** The 'zipfile' module does not validate the ZIP64 End of Central Directory (EOCD) Locator record offset value, leading to potential discrepancies in how ZIP archives are handled compared to other ZIP implementations. Specifically, the module incorrectly assumes the ZIP64 EOCD record's location, potentially allowing crafted ZIP archives to be processed in an unexpected manner. **Recommendations** Update to version 2.3 or later.

**Name of the Vulnerable Software and Affected Versions** Python (affected versions not specified) **Description** The `html.parser.HTMLParser` class contains a flaw where processing certain crafted malformed inputs results in worst-case quadratic complexity. This issue is caused by the use of a regular expression with inefficient computational complexity, which can lead to CPU exhaustion and an amplified denial-of-service. **Recommendations** At the moment, there is no information about a newer version that contains a fix for this vulnerability.

**Name of the Vulnerable Software and Affected Versions** Python versions 3.12 through 3.13 **Description** An issue exists in the `tarfile` module when extracting untrusted tar archives. When using the `TarFile.extractall()` or `TarFile.extract()` functions with the `filter` parameter set to `data` or `tar`, it is possible to modify file metadata (such as last modified time) or file permissions (chmod) for files located outside the intended extraction directory. In Python 3.14 and later, the default value of the `filter` parameter changed to `data`, making users who rely on this default behavior susceptible to the issue. This can lead to arbitrary file modification and potential data loss. **Recommendations** For Python 3.12, update to version 3.12.7-1ubuntu2.2 or later. For Python 3.13, update to version 3.13.0-1ubuntu0.3 or later. As a temporary mitigation, avoid using the `filter` parameter with values `data` or `tar` when extracting untrusted archives using `TarFile.extractall()` or `TarFile.extract()`.

**Name of the Vulnerable Software and Affected Versions** python3.12 versions prior to 3.12.7-1ubuntu2.2 python3.13 versions prior to 3.13.0-1ubuntu0.3 **Description** Python incorrectly handles tar archive extraction when using the filtering option. Specifically, when `TarFile.errorlevel` is set to `0` during extraction with a filter, the system fails to skip filtered members as documented, extracting them instead. This issue could allow a remote attacker to modify files in arbitrary filesystem locations, potentially leading to data loss or compromising the integrity of protected information. **Recommendations** Update python3.12 to version 3.12.7-1ubuntu2.2. Update python3.13 to version 3.13.0-1ubuntu0.3.

**Name of the Vulnerable Software and Affected Versions** Python versions 3.12 and later **Description** The issue allows the extraction filter to be ignored, enabling symlink targets to point outside the destination directory and the modification of some file metadata. This affects users who utilize the tarfile module to extract untrusted tar archives using TarFile.extractall() or TarFile.extract() with the filter parameter set to "data" or "tar". For Python 3.14 and later, the default filter value changed to "data", which also affects usage relying on this new default behavior. The installation of source distributions, which are tar archives, is not significantly affected as they already allow arbitrary code execution during the build process. **Recommendations** For Python versions 3.12 and later, consider updating to a version where this issue is fixed, although the specific fixed version is not provided. As a temporary workaround, avoid using the filter parameter with values of "data" or "tar" when extracting untrusted tar archives with TarFile.extractall() or TarFile.extract() until a patch is available. Restrict access to untrusted tar archives to minimize the risk of exploitation.

**Name of the Vulnerable Software and Affected Versions** Python versions 3.12 through 3.13 **Description** An issue in the `tarfile` module allows the extraction filter to be ignored when extracting untrusted tar archives. This can enable an attacker to create symbolic links that point outside the destination directory, modify file metadata, and potentially modify files in arbitrary filesystem locations, leading to data loss or unauthorized access to protected information. The issue occurs when using the `TarFile.extractall()` or `TarFile.extract()` functions with the `filter` parameter set to `data` or `tar`. For Python 3.14 and later, the default value of `filter` is `data`, making usage relying on this default behavior also susceptible. **Recommendations** Update Python 3.12 to version 3.12.7-1ubuntu2.2. Update Python 3.13 to version 3.13.0-1ubuntu0.3. Avoid using the `filter` parameter with values `data` or `tar` when extracting untrusted archives. Avoid installing source distributions containing suspicious links.

**Name of the Vulnerable Software and Affected Versions** Python versions 3.12 through 3.13 **Description** An issue in the `tarfile` module allows arbitrary filesystem writes outside the extraction directory when extracting untrusted tar archives. This occurs when using the `TarFile.extractall()` or `TarFile.extract()` functions with the `filter` parameter set to `data` or `tar`. For Python 3.14 and later, the default value of `filter` changed to `data`, making usage relying on this default behavior also susceptible. An attacker could exploit this to modify files in arbitrary locations, cause data loss, or potentially achieve privilege escalation or container escape if the scripts are executed with root privileges. **Recommendations** Update Python 3.12 to version 3.12.11 or later. Update Python 3.13 to version 3.13.4 or later. As a temporary mitigation, avoid using the `filter` parameter with values `data` or `tar` when extracting untrusted archives.

**Name of the Vulnerable Software and Affected Versions** python3.9 python3.11 python3.13 **Description** When reading an HTTP response from a server, if no read amount is specified, the default behavior is to use Content-Length. This allows a malicious server to cause the client to read large amounts of data into memory, potentially causing Out Of Memory (OOM) errors or other Denial of Service (DoS) conditions. The issue resides in the `http.client` module. **Recommendations** For python3.9, at the moment, there is no information about a newer version that contains a fix for this vulnerability. For python3.11, at the moment, there is no information about a newer version that contains a fix for this vulnerability. For python3.13, at the moment, there is no information about a newer version that contains a fix for this vulnerability.

**Name of the Vulnerable Software and Affected Versions** python3.9 python3.11 python3.13 **Description** The plistlib module does not properly validate the size of plist files during loading. A malicious plist file can specify a size that causes the module to attempt to allocate an excessive amount of memory, leading to an out-of-memory (OOM) condition and potential denial-of-service (DoS) issues. **Recommendations** For python3.9, avoid loading plist files from untrusted sources. For python3.11, avoid loading plist files from untrusted sources. For python3.13, avoid loading plist files from untrusted sources.

**Name of the Vulnerable Software and Affected Versions** Python versions 3.1 through 3.3 **Description** The issue allows remote attackers to obtain sensitive information, such as process memory, or cause a denial of service, resulting in memory corruption and crash, via unspecified vectors. This is due to the utf-16 decoder not updating the aligned end variable after calling the unicode decode call errorhandler function. **Recommendations** For Python versions 3.1 through 3.3, at the moment, there is no information about a newer version that contains a fix for this vulnerability.