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CVE-2026-11972

35
FAUCET Score

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.

First published: Jun 23, 2026Last modified: Jul 23, 2026

Impacted Technologies

VendorProductVersion(s)CPE
Python Software FoundationCPython
>= 0, < 3.15.0b4CNA affecteddefault unaffected

CVSS Data

CVSS version used by this source: 4.0

8.2HIGH

CVSS: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/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
PRESENT
Privileges Required
NONE
User Interaction
NONE
VS Confidentiality
NONE
VS Integrity
NONE
VS Availability
HIGH
SS Confidentiality
NONE
SS Integrity
NONE
SS Availability
NONE
Exploit Maturity
NOT_DEFINED
CvssVersion
4.0

Exploit Intelligence

EPSS Score
0.43%
Probability of exploitation in next 30 days
EPSS Percentile
35.5%
Percentile rank of EPSS score among Peer Group
As of 2026-07-26
Model: v2026.06.15
This CVE's current EPSS score of 0.0043 is in the 14th percentile among its peer group of 51,485 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.1 Mastodon, and 0.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Vendor Advisories (1)

microsoft2026-Jun/CVE-2026-11972Important

tarfile opened in streaming mode mishandles EOF

Jun 9, 2026

References

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