CVE-2026-11972CWE-252CWE-606CWE-770denial-of-service

CVE-2026-11972

published June 24, 2026

CVSS

8.2

EPSS

1%

Percentile

53.2

In the wild

Unconfirmed

What it is

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.

The record

Technical detail

CVSS: 8.2 · NONE
CVSS v4.0: Not supplied
EPSS: 0.00715 · 53.2th percentile
Weaknesses: CWE-252 · Unchecked Return Value; CWE-606 · Unchecked Input for Loop Condition; CWE-770 · Allocation of Resources Without Limits or Throttling
Published: 2026-06-24T03:16Z

References (10)

https://github.com/python/cpython/commit/3f031d431f80668e14f3bc066bbf4369cd9281b9 · [email protected]https://github.com/python/cpython/commit/4ce6bf7c8aa7725828a38981c306f214c1f29365 · [email protected]https://github.com/python/cpython/commit/7f0dc59c9a70f8f3b4da33d7c4a2ba552a7acc21 · [email protected]https://github.com/python/cpython/commit/e86666c9dd256d52d0fbef6feb1ea4a51768fdec · [email protected]https://github.com/python/cpython/commit/eb63c0f94dfcbea7fda8eab6213818e134d67192 · [email protected]https://github.com/python/cpython/commit/f50bf13566189c8d0ce5a814f33eff3d89951896 · [email protected]https://github.com/python/cpython/commit/f5e2776ff0383a902c12acf2b703e7e951fc8438 · [email protected]https://github.com/python/cpython/issues/151981 · [email protected]https://github.com/python/cpython/pull/151982 · [email protected]https://mail.python.org/archives/list/[email protected]/thread/AXPSKKTSRKXTTJULW3XSIC74WZNAAPPB/ · [email protected]

EPSS history

Timeline

23 JUN 22:02Z
tarfile opened in streaming mode mishandles EOF
cvelistv5