# CVE-2026-11972: tarfile opened in streaming mode mishandles EOF

CVE-2026-11972 is fixed in 70 products on 3 platforms, first by DEBIAN-CVE-2026-11972, released June 23, 2026. 10 other affected products have no fix yet. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2026-11972
- Priority: High
- CVSS: 8.2 (Important)
- EPSS: 0.0072
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Jun 23, 2026
- Weakness: Unchecked Return Value
- Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-11972

## 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.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Windows apps | Python 3.13 | 3.13.15 | [Python 3.13 3.13.15](https://patchblox.com/security/data/fix/windows-app/python.python.3.13-3.13.15.md) | Aug 5, 2026 |
| Windows apps | Python 3.14 | 3.14.7 | [Python 3.14 3.14.7](https://patchblox.com/security/data/fix/windows-app/python.python.3.14-3.14.7.md) | Aug 5, 2026 |
| Linux | pypy3 Debian 14 | 8.0.0+dfsg-1 | [DEBIAN-CVE-2026-11972](https://patchblox.com/security/data/fix/linux/debian-cve-2026-11972.md) | Jun 23, 2026 |
| Linux | python sles 15.7 | 2.7.18-150000.123.1 | [SUSE-SU-2026:3635-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-3635-1.md) | Aug 18, 2026 |
| Linux | python-base sles 15.7 | 2.7.18-150000.123.1 | [SUSE-SU-2026:3635-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-3635-1.md) | Aug 18, 2026 |
| Linux | python-unversioned-command amzn 2023 | 3.9.25-1.amzn2023.0.8 | [ALAS2023-2026-1963](https://patchblox.com/security/data/fix/linux/alas2023-2026-1963.md) | Jul 20, 2026 |
| Linux | python3 amzn 2023 | 3.9.25-1.amzn2023.0.8 | [ALAS2023-2026-1963](https://patchblox.com/security/data/fix/linux/alas2023-2026-1963.md) | Jul 20, 2026 |
| Linux | python3 sles 15.6 | 3.6.15-150300.10.129.1 | [SUSE-SU-2026:4754-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-4754-1.md) | Nov 7, 2026 |
| Linux | python3 sles 15.7 | 3.6.15-150300.10.129.1 | [SUSE-SU-2026:4754-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-4754-1.md) | Nov 7, 2026 |
| Linux | python3-core sles 15.6 | 3.6.15-150300.10.129.1 | [SUSE-SU-2026:4754-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-4754-1.md) | Nov 7, 2026 |
| Linux | python3-core sles 15.7 | 3.6.15-150300.10.129.1 | [SUSE-SU-2026:4754-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-4754-1.md) | Nov 7, 2026 |
| Linux | python3-debug amzn 2023 | 3.9.25-1.amzn2023.0.8 | [ALAS2023-2026-1963](https://patchblox.com/security/data/fix/linux/alas2023-2026-1963.md) | Jul 20, 2026 |
| Linux | python3-devel amzn 2023 | 3.9.25-1.amzn2023.0.8 | [ALAS2023-2026-1963](https://patchblox.com/security/data/fix/linux/alas2023-2026-1963.md) | Jul 20, 2026 |
| Linux | python3-idle amzn 2023 | 3.9.25-1.amzn2023.0.8 | [ALAS2023-2026-1963](https://patchblox.com/security/data/fix/linux/alas2023-2026-1963.md) | Jul 20, 2026 |
| Linux | python3-libs amzn 2023 | 3.9.25-1.amzn2023.0.8 | [ALAS2023-2026-1963](https://patchblox.com/security/data/fix/linux/alas2023-2026-1963.md) | Jul 20, 2026 |
| Linux | python3-test amzn 2023 | 3.9.25-1.amzn2023.0.8 | [ALAS2023-2026-1963](https://patchblox.com/security/data/fix/linux/alas2023-2026-1963.md) | Jul 20, 2026 |
| Linux | python3-tkinter amzn 2023 | 3.9.25-1.amzn2023.0.8 | [ALAS2023-2026-1963](https://patchblox.com/security/data/fix/linux/alas2023-2026-1963.md) | Jul 20, 2026 |
| Linux | python3.11 amzn 2023 | 3.11.15-1.amzn2023.0.4 | [ALAS2023-2026-1953](https://patchblox.com/security/data/fix/linux/alas2023-2026-1953.md) | Jul 20, 2026 |
| Linux | python3.11-debug amzn 2023 | 3.11.15-1.amzn2023.0.4 | [ALAS2023-2026-1953](https://patchblox.com/security/data/fix/linux/alas2023-2026-1953.md) | Jul 20, 2026 |
| Linux | python3.11-debuginfo amzn 2023 | 3.11.15-1.amzn2023.0.4 | [ALAS2023-2026-1953](https://patchblox.com/security/data/fix/linux/alas2023-2026-1953.md) | Jul 20, 2026 |
| Linux | python3.11-debugsource amzn 2023 | 3.11.15-1.amzn2023.0.4 | [ALAS2023-2026-1953](https://patchblox.com/security/data/fix/linux/alas2023-2026-1953.md) | Jul 20, 2026 |
| Linux | python3.11-devel amzn 2023 | 3.11.15-1.amzn2023.0.4 | [ALAS2023-2026-1953](https://patchblox.com/security/data/fix/linux/alas2023-2026-1953.md) | Jul 20, 2026 |
| Linux | python3.11-idle amzn 2023 | 3.11.15-1.amzn2023.0.4 | [ALAS2023-2026-1953](https://patchblox.com/security/data/fix/linux/alas2023-2026-1953.md) | Jul 20, 2026 |
| Linux | python3.11-libs amzn 2023 | 3.11.15-1.amzn2023.0.4 | [ALAS2023-2026-1953](https://patchblox.com/security/data/fix/linux/alas2023-2026-1953.md) | Jul 20, 2026 |
| Linux | python3.11-test amzn 2023 | 3.11.15-1.amzn2023.0.4 | [ALAS2023-2026-1953](https://patchblox.com/security/data/fix/linux/alas2023-2026-1953.md) | Jul 20, 2026 |
| Linux | python3.11-tkinter amzn 2023 | 3.11.15-1.amzn2023.0.4 | [ALAS2023-2026-1953](https://patchblox.com/security/data/fix/linux/alas2023-2026-1953.md) | Jul 20, 2026 |
| Linux | python3.12 amzn 2023 | 3.12.13-2.amzn2023.0.4 | [ALAS2023-2026-1954](https://patchblox.com/security/data/fix/linux/alas2023-2026-1954.md) | Jul 20, 2026 |
| Linux | python3.12-debug amzn 2023 | 3.12.13-2.amzn2023.0.4 | [ALAS2023-2026-1954](https://patchblox.com/security/data/fix/linux/alas2023-2026-1954.md) | Jul 20, 2026 |
| Linux | python3.12-debuginfo amzn 2023 | 3.12.13-2.amzn2023.0.4 | [ALAS2023-2026-1954](https://patchblox.com/security/data/fix/linux/alas2023-2026-1954.md) | Jul 20, 2026 |
| Linux | python3.12-debugsource amzn 2023 | 3.12.13-2.amzn2023.0.4 | [ALAS2023-2026-1954](https://patchblox.com/security/data/fix/linux/alas2023-2026-1954.md) | Jul 20, 2026 |
| Linux | python3.12-devel amzn 2023 | 3.12.13-2.amzn2023.0.4 | [ALAS2023-2026-1954](https://patchblox.com/security/data/fix/linux/alas2023-2026-1954.md) | Jul 20, 2026 |
| Linux | python3.12-idle amzn 2023 | 3.12.13-2.amzn2023.0.4 | [ALAS2023-2026-1954](https://patchblox.com/security/data/fix/linux/alas2023-2026-1954.md) | Jul 20, 2026 |
| Linux | python3.12-libs amzn 2023 | 3.12.13-2.amzn2023.0.4 | [ALAS2023-2026-1954](https://patchblox.com/security/data/fix/linux/alas2023-2026-1954.md) | Jul 20, 2026 |
| Linux | python3.12-test amzn 2023 | 3.12.13-2.amzn2023.0.4 | [ALAS2023-2026-1954](https://patchblox.com/security/data/fix/linux/alas2023-2026-1954.md) | Jul 20, 2026 |
| Linux | python3.12-tkinter amzn 2023 | 3.12.13-2.amzn2023.0.4 | [ALAS2023-2026-1954](https://patchblox.com/security/data/fix/linux/alas2023-2026-1954.md) | Jul 20, 2026 |
| Linux | python3.13 Debian 13.5 (trixie) | 3.13.5-2+deb13u5 | [DEBIAN-CVE-2026-11972](https://patchblox.com/security/data/fix/linux/debian-cve-2026-11972.md) | Jun 23, 2026 |
| Linux | python3.13 amzn 2023 | 3.13.14-1.amzn2023.0.2 | [ALAS2023-2026-1964](https://patchblox.com/security/data/fix/linux/alas2023-2026-1964.md) | Jul 20, 2026 |
| Linux | python3.13-debug amzn 2023 | 3.13.14-1.amzn2023.0.2 | [ALAS2023-2026-1964](https://patchblox.com/security/data/fix/linux/alas2023-2026-1964.md) | Jul 20, 2026 |
| Linux | python3.13-debuginfo amzn 2023 | 3.13.14-1.amzn2023.0.2 | [ALAS2023-2026-1964](https://patchblox.com/security/data/fix/linux/alas2023-2026-1964.md) | Jul 20, 2026 |
| Linux | python3.13-debugsource amzn 2023 | 3.13.14-1.amzn2023.0.2 | [ALAS2023-2026-1964](https://patchblox.com/security/data/fix/linux/alas2023-2026-1964.md) | Jul 20, 2026 |
| Linux | python3.13-devel amzn 2023 | 3.13.14-1.amzn2023.0.2 | [ALAS2023-2026-1964](https://patchblox.com/security/data/fix/linux/alas2023-2026-1964.md) | Jul 20, 2026 |
| Linux | python3.13-freethreading amzn 2023 | 3.13.14-1.amzn2023.0.2 | [ALAS2023-2026-1964](https://patchblox.com/security/data/fix/linux/alas2023-2026-1964.md) | Jul 20, 2026 |
| Linux | python3.13-freethreading-debug amzn 2023 | 3.13.14-1.amzn2023.0.2 | [ALAS2023-2026-1964](https://patchblox.com/security/data/fix/linux/alas2023-2026-1964.md) | Jul 20, 2026 |
| Linux | python3.13-idle amzn 2023 | 3.13.14-1.amzn2023.0.2 | [ALAS2023-2026-1964](https://patchblox.com/security/data/fix/linux/alas2023-2026-1964.md) | Jul 20, 2026 |
| Linux | python3.13-libs amzn 2023 | 3.13.14-1.amzn2023.0.2 | [ALAS2023-2026-1964](https://patchblox.com/security/data/fix/linux/alas2023-2026-1964.md) | Jul 20, 2026 |
| Linux | python3.13-test amzn 2023 | 3.13.14-1.amzn2023.0.2 | [ALAS2023-2026-1964](https://patchblox.com/security/data/fix/linux/alas2023-2026-1964.md) | Jul 20, 2026 |
| Linux | python3.13-tkinter amzn 2023 | 3.13.14-1.amzn2023.0.2 | [ALAS2023-2026-1964](https://patchblox.com/security/data/fix/linux/alas2023-2026-1964.md) | Jul 20, 2026 |
| Linux | python3.14 Debian 14 | 3.14.7-1 | [DEBIAN-CVE-2026-11972](https://patchblox.com/security/data/fix/linux/debian-cve-2026-11972.md) | Jun 23, 2026 |
| Linux | python3.14 amzn 2023 | 3.14.6-1.amzn2023.0.2 | [ALAS2023-2026-1962](https://patchblox.com/security/data/fix/linux/alas2023-2026-1962.md) | Jul 20, 2026 |
| Linux | python3.14-debug amzn 2023 | 3.14.6-1.amzn2023.0.2 | [ALAS2023-2026-1962](https://patchblox.com/security/data/fix/linux/alas2023-2026-1962.md) | Jul 20, 2026 |
| Linux | python3.14-debuginfo amzn 2023 | 3.14.6-1.amzn2023.0.2 | [ALAS2023-2026-1962](https://patchblox.com/security/data/fix/linux/alas2023-2026-1962.md) | Jul 20, 2026 |
| Linux | python3.14-debugsource amzn 2023 | 3.14.6-1.amzn2023.0.2 | [ALAS2023-2026-1962](https://patchblox.com/security/data/fix/linux/alas2023-2026-1962.md) | Jul 20, 2026 |
| Linux | python3.14-devel amzn 2023 | 3.14.6-1.amzn2023.0.2 | [ALAS2023-2026-1962](https://patchblox.com/security/data/fix/linux/alas2023-2026-1962.md) | Jul 20, 2026 |
| Linux | python3.14-freethreading amzn 2023 | 3.14.6-1.amzn2023.0.2 | [ALAS2023-2026-1962](https://patchblox.com/security/data/fix/linux/alas2023-2026-1962.md) | Jul 20, 2026 |
| Linux | python3.14-freethreading-debug amzn 2023 | 3.14.6-1.amzn2023.0.2 | [ALAS2023-2026-1962](https://patchblox.com/security/data/fix/linux/alas2023-2026-1962.md) | Jul 20, 2026 |
| Linux | python3.14-freethreading-devel amzn 2023 | 3.14.6-1.amzn2023.0.2 | [ALAS2023-2026-1962](https://patchblox.com/security/data/fix/linux/alas2023-2026-1962.md) | Jul 20, 2026 |
| Linux | python3.14-freethreading-idle amzn 2023 | 3.14.6-1.amzn2023.0.2 | [ALAS2023-2026-1962](https://patchblox.com/security/data/fix/linux/alas2023-2026-1962.md) | Jul 20, 2026 |
| Linux | python3.14-freethreading-libs amzn 2023 | 3.14.6-1.amzn2023.0.2 | [ALAS2023-2026-1962](https://patchblox.com/security/data/fix/linux/alas2023-2026-1962.md) | Jul 20, 2026 |
| Linux | python3.14-freethreading-test amzn 2023 | 3.14.6-1.amzn2023.0.2 | [ALAS2023-2026-1962](https://patchblox.com/security/data/fix/linux/alas2023-2026-1962.md) | Jul 20, 2026 |
| Linux | python3.14-freethreading-tkinter amzn 2023 | 3.14.6-1.amzn2023.0.2 | [ALAS2023-2026-1962](https://patchblox.com/security/data/fix/linux/alas2023-2026-1962.md) | Jul 20, 2026 |
| Linux | python3.14-idle amzn 2023 | 3.14.6-1.amzn2023.0.2 | [ALAS2023-2026-1962](https://patchblox.com/security/data/fix/linux/alas2023-2026-1962.md) | Jul 20, 2026 |
| Linux | python3.14-libs amzn 2023 | 3.14.6-1.amzn2023.0.2 | [ALAS2023-2026-1962](https://patchblox.com/security/data/fix/linux/alas2023-2026-1962.md) | Jul 20, 2026 |
| Linux | python3.14-test amzn 2023 | 3.14.6-1.amzn2023.0.2 | [ALAS2023-2026-1962](https://patchblox.com/security/data/fix/linux/alas2023-2026-1962.md) | Jul 20, 2026 |
| Linux | python3.14-tkinter amzn 2023 | 3.14.6-1.amzn2023.0.2 | [ALAS2023-2026-1962](https://patchblox.com/security/data/fix/linux/alas2023-2026-1962.md) | Jul 20, 2026 |
| Linux | python3.9-debuginfo amzn 2023 | 3.9.25-1.amzn2023.0.8 | [ALAS2023-2026-1963](https://patchblox.com/security/data/fix/linux/alas2023-2026-1963.md) | Jul 20, 2026 |
| Linux | python3.9-debugsource amzn 2023 | 3.9.25-1.amzn2023.0.8 | [ALAS2023-2026-1963](https://patchblox.com/security/data/fix/linux/alas2023-2026-1963.md) | Jul 20, 2026 |
| Linux | python311 sles 15.6 | 3.11.15-150600.3.62.2 | [SUSE-SU-2026:3560-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-3560-1.md) | Aug 10, 2026 |
| Linux | python311 sles 15.7 | 3.11.15-150600.3.62.2 | [SUSE-SU-2026:3560-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-3560-1.md) | Aug 10, 2026 |
| Linux | python311-core sles 15.6 | 3.11.15-150600.3.62.2 | [SUSE-SU-2026:3560-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-3560-1.md) | Aug 10, 2026 |
| Linux | python311-core sles 15.7 | 3.11.15-150600.3.62.2 | [SUSE-SU-2026:3560-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-3560-1.md) | Aug 10, 2026 |
| Linux | python312 sles 15.6 | 3.12.14-150600.3.68.1 | [SUSE-SU-2026:4534-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-4534-1.md) | Oct 6, 2026 |
| Linux | python312-core sles 15.6 | 3.12.14-150600.3.68.1 | [SUSE-SU-2026:4534-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-4534-1.md) | Oct 6, 2026 |
| Linux | python313 opensuse-leap 16.0 | 3.13.14-160000.2.1 | [OPENSUSE-SU-2026:21595-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-21595-1.md) | Aug 19, 2026 |
| Linux | python313 sles 15.7 | 3.13.14-150700.4.53.1 | [SUSE-SU-2026:3649-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-3649-1.md) | Aug 19, 2026 |
| Linux | python313 sles 16.0 | 3.13.14-160000.2.1 | [SUSE-SU-2026:23303-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-23303-1.md) | Aug 19, 2026 |
| Linux | python313-core opensuse-leap 16.0 | 3.13.14-160000.2.1 | [OPENSUSE-SU-2026:21595-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-21595-1.md) | Aug 19, 2026 |
| Linux | python313-core sles 15.7 | 3.13.14-150700.4.53.1 | [SUSE-SU-2026:3649-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-3649-1.md) | Aug 19, 2026 |
| Linux | python313-core sles 16.0 | 3.13.14-160000.2.1 | [SUSE-SU-2026:23303-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-23303-1.md) | Aug 19, 2026 |
| Linux | python313-documentation opensuse-leap 16.0 | 3.13.14-160000.2.1 | [OPENSUSE-SU-2026:21595-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-21595-1.md) | Aug 19, 2026 |
| Linux | python313-documentation sles 16.0 | 3.13.14-160000.2.1 | [SUSE-SU-2026:23303-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-23303-1.md) | Aug 19, 2026 |
| Linux | python313-nogil opensuse-leap 16.0 | 3.13.14-160000.2.1 | [OPENSUSE-SU-2026:21595-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-21595-1.md) | Aug 19, 2026 |
| Linux | python313-nogil-nogil-core opensuse-leap 16.0 | 3.13.14-160000.2.1 | [OPENSUSE-SU-2026:21595-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-21595-1.md) | Aug 19, 2026 |

## No fix yet

| Platform | Product | Status |
|---|---|---|
| Windows apps | Python 2 | no-fix |
| Windows apps | Python 3.10 | no-fix |
| Windows apps | Python 3.11 | no-fix |
| Windows apps | Python 3.12 | no-fix |
| Windows apps | Python 3.5 | no-fix |
| Windows apps | Python 3.6 | no-fix |
| Windows apps | Python 3.7 | no-fix |
| Windows apps | Python 3.8 | no-fix |
| Windows apps | Python 3.9 | no-fix |
| macOS | Python3 | no-fix |

---

Data as of 2026-11-08T13:06:02Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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