# CVE-2026-4647: Binutils: out-of-bounds read in xcoff relocation processing in gnu binutils bfd library

CVE-2026-4647 is fixed in 12 products on 1 platform, first by DEBIAN-CVE-2026-4647, released March 23, 2026. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2026-4647
- Priority: Routine
- CVSS: 6.1 (Moderate)
- EPSS: 0.0017
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Mar 23, 2026
- Weakness: Out-of-bounds Read
- Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-4647

## Description

A flaw was found in the GNU Binutils BFD library, a widely used component for handling binary files such as object files and executables. The issue occurs when processing specially crafted XCOFF object files, where a relocation type value is not properly validated before being used. This can cause the program to read memory outside of intended bounds. As a result, affected tools may crash or expose unintended memory contents, leading to denial-of-service or limited information disclosure risks.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | binutils Debian 14 | 2.47-1 | [DEBIAN-CVE-2026-4647](https://patchblox.com/security/data/fix/linux/debian-cve-2026-4647.md) | Mar 23, 2026 |
| Linux | mingw-binutils Fedora 43 | 2.45.1-2.fc43 | [FEDORA-2026-9174E6EA37](https://patchblox.com/security/data/fix/linux/fedora-2026-9174e6ea37.md) | Mar 27, 2026 |
| Linux | mingw-binutils-debuginfo Fedora 43 | 2.45.1-2.fc43 | [FEDORA-2026-9174E6EA37](https://patchblox.com/security/data/fix/linux/fedora-2026-9174e6ea37.md) | Mar 27, 2026 |
| Linux | mingw-binutils-debugsource Fedora 43 | 2.45.1-2.fc43 | [FEDORA-2026-9174E6EA37](https://patchblox.com/security/data/fix/linux/fedora-2026-9174e6ea37.md) | Mar 27, 2026 |
| Linux | mingw-binutils-generic Fedora 43 | 2.45.1-2.fc43 | [FEDORA-2026-9174E6EA37](https://patchblox.com/security/data/fix/linux/fedora-2026-9174e6ea37.md) | Mar 27, 2026 |
| Linux | mingw-binutils-generic-debuginfo Fedora 43 | 2.45.1-2.fc43 | [FEDORA-2026-9174E6EA37](https://patchblox.com/security/data/fix/linux/fedora-2026-9174e6ea37.md) | Mar 27, 2026 |
| Linux | mingw32-binutils Fedora 43 | 2.45.1-2.fc43 | [FEDORA-2026-9174E6EA37](https://patchblox.com/security/data/fix/linux/fedora-2026-9174e6ea37.md) | Mar 27, 2026 |
| Linux | mingw32-binutils-debuginfo Fedora 43 | 2.45.1-2.fc43 | [FEDORA-2026-9174E6EA37](https://patchblox.com/security/data/fix/linux/fedora-2026-9174e6ea37.md) | Mar 27, 2026 |
| Linux | mingw64-binutils Fedora 43 | 2.45.1-2.fc43 | [FEDORA-2026-9174E6EA37](https://patchblox.com/security/data/fix/linux/fedora-2026-9174e6ea37.md) | Mar 27, 2026 |
| Linux | mingw64-binutils-debuginfo Fedora 43 | 2.45.1-2.fc43 | [FEDORA-2026-9174E6EA37](https://patchblox.com/security/data/fix/linux/fedora-2026-9174e6ea37.md) | Mar 27, 2026 |
| Linux | ucrt64-binutils Fedora 43 | 2.45.1-2.fc43 | [FEDORA-2026-9174E6EA37](https://patchblox.com/security/data/fix/linux/fedora-2026-9174e6ea37.md) | Mar 27, 2026 |
| Linux | ucrt64-binutils-debuginfo Fedora 43 | 2.45.1-2.fc43 | [FEDORA-2026-9174E6EA37](https://patchblox.com/security/data/fix/linux/fedora-2026-9174e6ea37.md) | Mar 27, 2026 |

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Data as of 2026-11-08T06:59:42Z 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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