VulnerabilityAwaiting Analysis
CVE-2026-11972
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.
HIGH 8.2EPSS 0.45%
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (0.45%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
Description
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.
- CVSS 4.0
- 8.2 HIGHCVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/M
- EPSS
- 0.45% probability · 38th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-252, CWE-606, CWE-770
- Source
- cna@python.org
References
- 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
- https://github.com/python/cpython/commit/f5e2776ff0383a902c12acf2b703e7e951fc8438
- 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/
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.