CVE-2026-11972

Summary

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.

Affected Software

Weaknesses

• CWE-252: CWE-252
• CWE-606: CWE-606
• CWE-770: CWE-770

ADP Enrichment

CISA ADP Vulnrichment

• SSVC:
• Exploitation: none
  • Automatable: no
  • Technical Impact: partial

References

• https://github.com/python/cpython/issues/151981
• https://github.com/python/cpython/pull/151982
• https://mail.python.org/archives/list/security-announce@python.org/thread/AXPSKKTSRKXTTJULW3XSIC74WZNAAPPB/
• https://github.com/python/cpython/commit/3f031d431f80668e14f3bc066bbf4369cd9281b9
• https://github.com/python/cpython/commit/4ce6bf7c8aa7725828a38981c306f214c1f29365
• https://github.com/python/cpython/commit/7f0dc59c9a70f8f3b4da33d7c4a2ba552a7acc21
• https://github.com/python/cpython/commit/e86666c9dd256d52d0fbef6feb1ea4a51768fdec
• https://github.com/python/cpython/commit/eb63c0f94dfcbea7fda8eab6213818e134d67192
• https://github.com/python/cpython/commit/f50bf13566189c8d0ce5a814f33eff3d89951896

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