XDGMIME Heap Buffer Overflow via MIME Magic File (CVE-2026-16118)
CVE-2026-16118 Published on July 17, 2026

Xdgmime: heap-based buffer overflow in _xdg_mime_magic_parse_magic_line() in xdgmimemagic.c
A flaw was found in xdgmime. A heap-based buffer overflow can be triggered in _xdg_mime_magic_parse_magic_line() in the xdgmimemagic.c file on little-endian systems when an attacker-controlled MIME magic file in a user-writable XDG data location (e.g., in the $XDG_DATA_HOME/mime/magic path) is parsed by an application performing MIME type detection (e.g., via g_content_type_guess()). When performing byte-swap, incorrect pointer arithmetic on the write side causes an out-of-bounds write of 2 bytes, resulting in an application crash or memory corruption.

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Vulnerability Analysis

CVE-2026-16118 is exploitable with local system access, requires user interaction. This vulnerability is considered to have a low attack complexity. Public availability of a proof of concept (POC) exploit exists for CVE-2026-16118. The potential impact of an exploit of this vulnerability is considered to have no impact on confidentiality, a high impact on integrity and availability.

Attack Vector:

LOCAL

Attack Complexity:

LOW

Privileges Required:

NONE

User Interaction:

REQUIRED

Scope:

UNCHANGED

Confidentiality Impact:

NONE

Integrity Impact:

HIGH

Availability Impact:

HIGH

Timeline

2026-07-17

Reported to Red Hat.

2026-07-07

Made public.

Weakness Type

Heap-based Buffer Overflow

A heap overflow condition is a buffer overflow, where the buffer that can be overwritten is allocated in the heap portion of memory, generally meaning that the buffer was allocated using a routine such as malloc().

Products Associated with CVE-2026-16118

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Red Hat Enterprise Linux (RHEL)

Red Hat Rhui

Red Hat Rhel E4s

Red Hat Enterprise Linux Eus

Red Hat Rhel Eus

Red Hat Cert Manager

Red Hat Ai Inference Server

Red Hat Openshift Ai

Red Hat Cost Management On Premise

Affected Versions

xdgmime: Red Hat Enterprise Linux 10:

Version 0:2.80.4-12.el10_2.22 and below * is unaffected.

Red Hat Enterprise Linux 10.0 Extended Update Support:

Version 0:2.80.4-4.el10_0.18 and below * is unaffected.

Red Hat Enterprise Linux 8:

Version 0:2.56.4-178.el8_10 and below * is unaffected.

Red Hat Enterprise Linux 9:

Version 0:2.68.4-19.el9_8.10 and below * is unaffected.

Red Hat Enterprise Linux 9:

Version 0:2.68.4-19.el9_8.10 and below * is unaffected.

Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions:

Version 0:2.68.4-7.el9_2.8 and below * is unaffected.

Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions:

Version 0:2.68.4-14.el9_4.9 and below * is unaffected.

Red Hat Enterprise Linux 9.6 Extended Update Support:

Version 0:2.68.4-16.el9_6.8 and below * is unaffected.

Cert Manager support for Red Hat OpenShift release 1.17:

Version 1791371080 and below * is unaffected.

Cert Manager support for Red Hat OpenShift release 1.17:

Version 1791371069 and below * is unaffected.

Cert Manager support for Red Hat OpenShift release 1.17:

Version 1791788287 and below * is unaffected.

Cert Manager support for Red Hat OpenShift release 1.17:

Version 1791378395 and below * is unaffected.

Cert Manager support for Red Hat OpenShift release 1.17:

Version 1791970484 and below * is unaffected.

Cert Manager support for Red Hat OpenShift release 1.18:

Version 1791459707 and below * is unaffected.

Cert Manager support for Red Hat OpenShift release 1.18:

Version 1791459711 and below * is unaffected.

Cert Manager support for Red Hat OpenShift release 1.18:

Version 1791459759 and below * is unaffected.

Cert Manager support for Red Hat OpenShift release 1.18:

Version 1789029076 and below * is unaffected.

Cert Manager support for Red Hat OpenShift release 1.18:

Version 1791966259 and below * is unaffected.