# CVE-2026-15003: GNU Binutils heap overflow in linker XCOFF processing

Source: https://junglewise.ai/threats/cve-2026-15003-gnu-binutils-heap-overflow-in-linker-xcoff-processing  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-07-27. Updated: 2026-07-27  
License: CC BY 4.0 with a link back

CVE-2026-15003 · Severity: medium · CVSS 5.6 · Published 2026-07-27

A security vulnerability has been identified in the GNU Binutils linker, a tool used by developers to combine computer code into executable programs. By tricking a user into processing a specially crafted 32-bit XCOFF object file, an attacker could cause the tool to crash or potentially access sensitive information stored in the system's memory. This could lead to a disruption of software development workflows or the unauthorized disclosure of internal data.

Technologies: [Red Hat Enterprise Linux 10](https://junglewise.ai/threats/technologies/enterprise-linux-10), [Red Hat Enterprise Linux 6](https://junglewise.ai/threats/technologies/enterprise-linux-6), [Red Hat Enterprise Linux 7](https://junglewise.ai/threats/technologies/enterprise-linux-7). Vendors: [Red Hat](https://junglewise.ai/threats/vendors/red-hat).

## Quick answers

**Is CVE-2026-15003 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-15003 being exploited in the wild.

**How severe is CVE-2026-15003?** Medium severity, with a CVSS score of 5.6, published 27 July 2026.

**Which products and versions are affected?** Red Hat Enterprise Linux 10 affected; Red Hat Enterprise Linux 6 affected; Red Hat Enterprise Linux 7 affected.

**Is there a fix for CVE-2026-15003?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is CVE-2026-15003 attacked?** It is attacked with local access, in a software library.

**Am I affected by CVE-2026-15003?** Check whether you run Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 6 or Red Hat Enterprise Linux 7 at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

A heap-buffer-overflow read (CWE-125) exists in the GNU Binutils linker component. The flaw is triggered when the linker attempts to process a specially crafted 32-bit XCOFF (Extended Common Object File Format) object file. An attacker with local access can exploit this by providing a malicious file for the linker to process, which requires user interaction (UI:R). Successful exploitation results in an out-of-bounds read, which can lead to a crash (Denial of Service) or the leakage of sensitive data from heap memory. The vulnerability is tracked upstream in sourceware bug 34053.

## Affected products

- GNU Binutils unspecified
- Red Hat Enterprise Linux 10 affected
- Red Hat Enterprise Linux 7 affected
- Red Hat Enterprise Linux 6 affected

## Timeline

- 2026-07-07: disclosed: Reported to Red Hat Bugzilla
- 2026-07-27: advisory: NVD publication date

## References

- [https://access.redhat.com/downloads/content/package-browser/](https://access.redhat.com/downloads/content/package-browser/)
- [https://access.redhat.com/security/cve/CVE-2026-15003](https://access.redhat.com/security/cve/CVE-2026-15003)
- [https://bugzilla.redhat.com/show_bug.cgi?id=2497805](https://bugzilla.redhat.com/show_bug.cgi?id=2497805)
- [https://sourceware.org/bugzilla/show_bug.cgi?id=34053](https://sourceware.org/bugzilla/show_bug.cgi?id=34053)

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