RHSA-2026:7443

The 'zipfile' module would not check the validity of the ZIP64 End of Central Directory (EOCD) Locator record offset value would not be used to locate the ZIP64 EOCD record, instead the ZIP64 EOCD record would be assumed…

When building nested elements using xml.dom.minidom methods such as appendChild() that have a dependency on _clear_id_cache() the algorithm is quadratic.

The webbrowser.open() API would accept leading dashes in the URL which could be handled as command line options for certain web browsers.

When reading an HTTP response from a server, if no read amount is specified, the default behavior will be to use Content-Length.

The poplib module, when passed a user-controlled command, can have additional commands injected using newlines.

When an Expat parser with a registered ElementDeclHandler parses an inline document type definition containing a deeply nested content model a C stack overflow occurs.

The email module, specifically the "BytesGenerator" class, didn’t properly quote newlines for email headers when serializing an email message allowing for header injection when an email is serialized.

User-controlled data URLs parsed by urllib.request.DataHandler allow injecting headers through newlines in the data URL mediatype.

The fix for CVE-2026-0672, which rejected control characters in http.cookies.Morsel, was incomplete.

User-controlled header names and values containing newlines can allow injecting HTTP headers.

When folding a long comment in an email header containing exclusively unfoldable characters, the parenthesis would not be preserved.

When calling base64.b64decode() or related functions the decoding process would stop after encountering the first padded quad regardless of whether there was more information to be processed.

The "profiling.sampling" module (Python 3.15+) and "asyncio introspection capabilities" (3.14+, "python -m asyncio ps" and "python -m asyncio pstree") features could be used to read and write addresses in a privileged pr…

The import hook in CPython that handles legacy *.pyc files (SourcelessFileLoader) is incorrectly handled in FileLoader (a base class) and so does not use io.open_code() to read the .pyc files.

When loading a plist file, the plistlib module reads data in size specified by the file itself, meaning a malicious file can cause OOM and DoS issues

The "tarfile" module would still apply normalization of AREGTYPE (\x00) blocks to DIRTYPE, even while processing a multi-block member such as GNUTYPE_LONGNAME or GNUTYPE_LONGLINK.

If the value passed to os.path.expandvars() is user-controlled a performance degradation is possible when expanding environment variables.

DISPUTED: The project has clarified that the documentation was incorrect, and that pkgutil.get_data() has the same security model as open().