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CVE-2026-4367 Red Hat CVE debrief

CVE-2026-4367 is a MEDIUM-severity vulnerability in libXpm, a library for handling X PixMap (XPM) images. The vulnerability, with a CVSS score of 5.5, allows a local user with low privileges to exploit an Out-of-Bounds Read vulnerability in the `xpmNextWord()` function. This can be done by processing a specially crafted or very small XPM image file, which can cause an internal pointer to read beyond the file's end. This improper validation of file boundaries can lead to application crashes and Denial of Service (DoS) conditions.

Vendor
Red Hat
Product
Red Hat Enterprise Linux 10
CVSS
MEDIUM 5.5
CISA KEV
Not listed in stored evidence
Original CVE published
2026-06-16
Original CVE updated
2026-07-28
Advisory published
2026-06-16
Advisory updated
2026-07-28

Who should care

Users of libXpm, particularly those in Linux environments, should be aware of this vulnerability. It may affect various Linux distributions and applications that utilize libXpm for image processing.

Technical summary

The vulnerability is caused by an Out-of-Bounds Read in the `xpmNextWord()` function of libXpm. This function fails to properly validate the boundaries of XPM image files, allowing a local attacker with low privileges to cause the application to crash or potentially execute arbitrary code.

Defensive priority

MEDIUM

Recommended defensive actions

  • Apply patches or updates provided by the libXpm maintainers or Linux distribution vendors as soon as they become available.
  • Restrict access to XPM image files to prevent low-privileged users from exploiting the vulnerability.
  • Monitor for and respond to potential DoS conditions that could arise from exploitation of this vulnerability.

Evidence notes

The CVE record and details were obtained from official sources, including the CVE website and the NVD database.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-4367 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-4367

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-4367 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-4367

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.