# CVE-2026-56392: Heap-based Buffer Overflow in GNU coreutils

CVE-2026-56392 is fixed in 3 products on 1 platform, first by RHSA-2026:67886, released July 24, 2026. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2026-56392
- Priority: Routine
- CVSS: 6.1 (Low)
- EPSS: 0.0019
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Jul 24, 2026
- Weakness: Heap-based Buffer Overflow
- Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-56392

## Description

The coreutils packages contain the GNU Core Utilities and represent a combination of the previously used GNU fileutils, sh-utils, and textutils packages.  Bug Fix(es) and Enhancement(s):  * Fix execution of the downstream tests in coreutils-df-direct.patch and coreutils-i18n.patch [rhel-8.10.z] (JIRA:RHEL-151533)  * unexpand: stack overflow with large tabsizes [rhel-8.10.z] (JIRA:RHEL-182699)

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | coreutils RHEL 10 | 9.5-8.el10_2.1 | [RHSA-2026:67886](https://patchblox.com/security/data/fix/linux/rhsa-2026-67886.md) | Jul 24, 2026 |
| Linux | coreutils RHEL 8 | 0:8.30-20.el8_10 | [RHBA-2026:47115](https://patchblox.com/security/data/fix/linux/rhba-2026-47115.md) | Jul 31, 2026 |
| Linux | coreutils RHEL 9 | 0:8.32-41.el9_8.1 | [RHSA-2026:66403](https://patchblox.com/security/data/fix/linux/rhsa-2026-66403.md) | Sep 13, 2026 |
| Linux | coreutils almalinux 10 | 9.5-8.el10_2.1 | [ALSA-2026:67886](https://patchblox.com/security/data/fix/linux/alsa-2026-67886.md) | Sep 16, 2026 |
| Linux | coreutils almalinux 9 | 8.32-41.el9_8.1 | [ALSA-2026:66403](https://patchblox.com/security/data/fix/linux/alsa-2026-66403.md) | Sep 10, 2026 |
| Linux | coreutils ol 10 | 0:9.5-8.0.1.el10_2.1 | [ELSA-2026-67886](https://patchblox.com/security/data/fix/linux/elsa-2026-67886.md) | Sep 16, 2026 |
| Linux | coreutils ol 9 | 0:8.32-41.0.1.el9_8.1 | [ELSA-2026-66403-0](https://patchblox.com/security/data/fix/linux/elsa-2026-66403-0.md) | Sep 10, 2026 |
| Linux | coreutils rocky 10 | 0:9.5-8.el10_2.1 | [RLSA-2026:67886](https://patchblox.com/security/data/fix/linux/rlsa-2026-67886.md) | Sep 17, 2026 |
| Linux | coreutils rocky 9 | 0:8.32-41.el9_8.1 | [RLSA-2026:66403](https://patchblox.com/security/data/fix/linux/rlsa-2026-66403.md) | Sep 11, 2026 |
| Linux | coreutils-common RHEL 8 | 0:8.30-20.el8_10 | [RHBA-2026:47115](https://patchblox.com/security/data/fix/linux/rhba-2026-47115.md) | Jul 31, 2026 |
| Linux | coreutils-common almalinux 10 | 9.5-8.el10_2.1 | [ALSA-2026:67886](https://patchblox.com/security/data/fix/linux/alsa-2026-67886.md) | Sep 16, 2026 |
| Linux | coreutils-common almalinux 9 | 8.32-41.el9_8.1 | [ALSA-2026:66403](https://patchblox.com/security/data/fix/linux/alsa-2026-66403.md) | Sep 10, 2026 |
| Linux | coreutils-common ol 10 | 0:9.5-8.0.1.el10_2.1 | [ELSA-2026-67886](https://patchblox.com/security/data/fix/linux/elsa-2026-67886.md) | Sep 16, 2026 |
| Linux | coreutils-common ol 9 | 0:8.32-41.0.1.el9_8.1 | [ELSA-2026-66403-0](https://patchblox.com/security/data/fix/linux/elsa-2026-66403-0.md) | Sep 10, 2026 |
| Linux | coreutils-single RHEL 8 | 0:8.30-20.el8_10 | [RHBA-2026:47115](https://patchblox.com/security/data/fix/linux/rhba-2026-47115.md) | Jul 31, 2026 |
| Linux | coreutils-single RHEL 9 | 0:8.32-41.el9_8.1 | [RHSA-2026:66403](https://patchblox.com/security/data/fix/linux/rhsa-2026-66403.md) | Sep 13, 2026 |
| Linux | coreutils-single almalinux 10 | 9.5-8.el10_2.1 | [ALSA-2026:67886](https://patchblox.com/security/data/fix/linux/alsa-2026-67886.md) | Sep 16, 2026 |
| Linux | coreutils-single almalinux 9 | 8.32-41.el9_8.1 | [ALSA-2026:66403](https://patchblox.com/security/data/fix/linux/alsa-2026-66403.md) | Sep 10, 2026 |
| Linux | coreutils-single ol 10 | 0:9.5-8.0.1.el10_2.1 | [ELSA-2026-67886](https://patchblox.com/security/data/fix/linux/elsa-2026-67886.md) | Sep 16, 2026 |
| Linux | coreutils-single ol 9 | 0:8.32-41.0.1.el9_8.1 | [ELSA-2026-66403-0](https://patchblox.com/security/data/fix/linux/elsa-2026-66403-0.md) | Sep 10, 2026 |

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Data as of 2026-11-10T01:44:33Z 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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