Red Hat Security Advisory: Red Hat Hardened Images RPMs bug fix and enhancement update

Fixed packages 7

Vulnerabilities 18

• Critical 9.1
  CVE-2026-6100

  Use-after-free in lzma.LZMADecompressor, bz2.BZ2Decompressor, and gzip.GzipFile after re-use under memory pressure

  Use-after-free (UAF) was possible in the `lzma.LZMADecompressor`, `bz2.BZ2Decompressor`, and `gzip.GzipFile` when a memory allocation fails with a `MemoryError` and the decompression instance is re-used. This scenario can be triggered if the process is under …

  Python Software Foundation CPython python3.4 python3.5 Debian Ubuntu Azure Linux Alpine Wolfi
  Apr 13, 2026
• High 7.0
  CVE-2026-4786

  Incomplete mitigation of CVE-2026-4519, %action expansion for command injection to webbrowser.open()

  Mitgation of CVE-2026-4519 was incomplete. If the URL contained "%action" the mitigation could be bypassed for certain browser types the "webbrowser.open()" API could have commands injected into the underlying shell. See CVE-2026-4519 for details.

  Python Software Foundation CPython python3.4 python3.5 Debian Ubuntu Azure Linux Alpine Wolfi
  Apr 13, 2026
• Medium 6.3
  CVE-2025-12084

  Quadratic complexity in node ID cache clearing

  When building nested elements using xml.dom.minidom methods such as appendChild() that have a dependency on _clear_id_cache() the algorithm is quadratic. Availability can be impacted when building excessively nested documents.

  Python Software Foundation CPython python3.4 python3.5 Debian Ubuntu Azure Linux Wolfi
  Dec 3, 2025
• Medium 6.3
  CVE-2025-13836

  Excessive read buffering DoS in http.client

  When reading an HTTP response from a server, if no read amount is specified, the default behavior will be to use Content-Length. This allows a malicious server to cause the client to read large amounts of data into memory, potentially causing OOM or other DoS.

  Python Software Foundation CPython python3.8 python3.9 Debian Ubuntu Azure Linux Wolfi
  Dec 1, 2025
• Medium 6.0
  CVE-2025-15282

  Header injection via newlines in data URL mediatype

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

  Python Software Foundation CPython python3.4 python3.5 Debian Ubuntu Wolfi
  Jan 20, 2026
• Medium 6.0
  CVE-2026-1299

  email BytesGenerator header injection due to unquoted newlines

  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. This is only applicable if using "LiteralHeader" writing h…

  Python Software Foundation CPython python3.4 python3.5 Debian Ubuntu Azure Linux Wolfi
  Jan 23, 2026
• Medium 6.0
  CVE-2026-3644

  Incomplete control character validation in http.cookies

  The fix for CVE-2026-0672, which rejected control characters in http.cookies.Morsel, was incomplete. The Morsel.update(), |= operator, and unpickling paths were not patched, allowing control characters to bypass input validation. Additionally, BaseCookie.js_o…

  Python Software Foundation CPython python3.4 python3.5 Debian Ubuntu Azure Linux Alpine Wolfi
  Mar 16, 2026
• Medium 6.0
  CVE-2026-4224

  Stack overflow parsing XML with deeply nested DTD content models

  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.

  Python Software Foundation CPython python3.4 python3.5 Debian Ubuntu Azure Linux Alpine Wolfi
  Mar 16, 2026
• Medium 5.9
  CVE-2025-15366

  IMAP command injection in user-controlled commands

  The imaplib module, when passed a user-controlled command, can have additional commands injected using newlines. Mitigation rejects commands containing control characters.

  Python Software Foundation CPython python3.4 python3.5 Debian Ubuntu Azure Linux Alpine Wolfi
  Jan 20, 2026
• Medium 5.9
  CVE-2025-15367

  POP3 command injection in user-controlled commands

  The poplib module, when passed a user-controlled command, can have additional commands injected using newlines. Mitigation rejects commands containing control characters.

  Python Software Foundation CPython python3.4 python3.5 Debian Ubuntu Azure Linux Wolfi
  Jan 20, 2026
• Medium 5.9
  CVE-2026-0865

  wsgiref.headers.Headers allows header newline injection

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

  Python Software Foundation CPython python3.4 python3.5 Debian Ubuntu Azure Linux Wolfi
  Jan 20, 2026
• Medium 5.7
  CVE-2025-11468

  Folding email comments of unfoldable characters doesn't preserve parenthesis

  When folding a long comment in an email header containing exclusively unfoldable characters, the parenthesis would not be preserved. This could be used for injecting headers into email messages where addresses are user-controlled and not sanitized.

  Python Software Foundation CPython python3.6 python3.8 Debian Ubuntu Azure Linux Wolfi
  Jan 20, 2026
• Medium 5.7
  CVE-2026-1502

  HTTP client proxy tunnel headers not validated for CR/LF

  CR/LF bytes were not rejected by HTTP client proxy tunnel headers or host.

  Python Software Foundation CPython python3.4 python3.5 Debian Ubuntu Azure Linux Alpine Wolfi
  Apr 10, 2026
• Medium 5.7
  CVE-2026-2297

  SourcelessFileLoader does not use io.open_code()

  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. sys.audit handlers for this audit event therefore do not fire.

  Python Software Foundation CPython tensorflow python3.8 Debian Ubuntu Azure Linux Alpine Wolfi
  Mar 4, 2026
• Medium 5.3
  CVE-2026-5713

  Out-of-bounds read/write during remote profiling and asyncio process introspection when connecting to malicious target

  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 process if that process connected to a ma…

  Python Software Foundation CPython python3.14 python3.14 Debian Ubuntu
  Apr 14, 2026
• Medium 4.3
  CVE-2025-8291

  ZIP64 End of Central Directory (EOCD) Locator record offset not checked

  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 to be the previous record in the ZIP a…

  Python Software Foundation CPython python3.4 python3.5 Debian Ubuntu Azure Linux Wolfi
  Oct 7, 2025
• Low 2.1
  CVE-2025-13837

  Out-of-memory when loading Plist

  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

  Python Software Foundation CPython python3.4 python3.5 Debian Ubuntu Azure Linux Wolfi
  Dec 1, 2025
• Low 1.8
  CVE-2025-6075

  Quadratic complexity in os.path.expandvars() with user-controlled template

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

  Python Software Foundation CPython python3.4 python3.5 Debian Ubuntu Azure Linux Wolfi
  Oct 31, 2025

References

• article
  https://images.redhat.com/
• report
  https://access.redhat.com/security/cve/CVE-2026-5713
• article
  https://access.redhat.com/security/updates/classification/
• report
  https://access.redhat.com/security/cve/CVE-2026-1299
• report
  https://access.redhat.com/security/cve/CVE-2026-0865
• report
  https://access.redhat.com/security/cve/CVE-2025-6075
• report
  https://access.redhat.com/security/cve/CVE-2025-13837
• report
  https://access.redhat.com/security/cve/CVE-2025-13836
• report
  https://access.redhat.com/security/cve/CVE-2025-11468
• report
  https://access.redhat.com/security/cve/CVE-2025-8291
• report
  https://access.redhat.com/security/cve/CVE-2025-12084
• report
  https://access.redhat.com/security/cve/CVE-2025-15282
• report
  https://access.redhat.com/security/cve/CVE-2025-15367
• report
  https://access.redhat.com/security/cve/CVE-2026-4786
• report
  https://access.redhat.com/security/cve/CVE-2026-4224
• report
  https://access.redhat.com/security/cve/CVE-2026-3644
• report
  https://access.redhat.com/security/cve/CVE-2026-6100
• report
  https://access.redhat.com/security/cve/CVE-2026-1502
• report
  https://access.redhat.com/security/cve/CVE-2026-2297
• report
  https://access.redhat.com/security/cve/CVE-2025-15366
• advisory
  https://security.access.redhat.com/data/csaf/v2/advisories/2026/rhsa-2026_8824.json
• report
  https://bugzilla.redhat.com/show_bug.cgi?id=2408891
• advisory
  https://www.cve.org/CVERecord?id=CVE-2025-6075
• advisory
  https://nvd.nist.gov/vuln/detail/CVE-2025-6075
• article
  https://github.com/python/cpython/issues/136065
• article
  https://mail.python.org/archives/list/security-announce@python.org/thread/IUP5QJ6D4KK6ULHOMPC7DPNKRYQTQNLA/
• report
  https://bugzilla.redhat.com/show_bug.cgi?id=2402342
• advisory
  https://www.cve.org/CVERecord?id=CVE-2025-8291
• advisory
  https://nvd.nist.gov/vuln/detail/CVE-2025-8291
• article
  https://github.com/python/cpython/commit/162997bb70e067668c039700141770687bc8f267
• article
  https://github.com/python/cpython/commit/333d4a6f4967d3ace91492a39ededbcf3faa76a6
• article
  https://github.com/python/cpython/issues/139700
• article
  https://github.com/python/cpython/pull/139702
• article
  https://mail.python.org/archives/list/security-announce@python.org/thread/QECOPWMTH4VPPJAXAH2BGTA4XADOP62G/
• report
  https://bugzilla.redhat.com/show_bug.cgi?id=2431375
• advisory
  https://www.cve.org/CVERecord?id=CVE-2025-11468
• advisory
  https://nvd.nist.gov/vuln/detail/CVE-2025-11468
• article
  https://github.com/python/cpython/issues/143935
• article
  https://github.com/python/cpython/pull/143936