--- id: CVE-2026-16118 title: A flaw was found in xdgmime summary: >- 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 … severity: high cvss: 7.1 cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:H' cwe: - CWE-122 vendor: xdg product: xdgmime affected: - xdgmime (all versions) - glib2 (all versions) - glib2 (all versions) - glib2 (all versions) - glib2 (all versions) - glib2 (all versions) - glib2 (all versions) - glib2 (all versions) - rhui5/cds-kubernetes-rhel9 (all versions) - rhui5/cds-rhel9 (all versions) - rhui5/haproxy-rhel9 (all versions) - rhui5/installer-rhel9 (all versions) - rhui5/rhua-rhel9 (all versions) - glib2 (all versions) - webkitgtk4 (all versions) - webkit2gtk3 (all versions) - webkit2gtk3 (all versions) patched: - enterprise_linux_appstream_v_10 - enterprise_linux_appstream_v_9 - enterprise_linux_baseos_v_10 - enterprise_linux_baseos_v_9 - enterprise_linux_codeready_linux_builder_v_10 - enterprise_linux_codeready_linux_builder_v_9 published: '2026-07-17' updated: '2026-09-24' sourceUpdated: '2026-09-24T18:17:13.030' source: NVD sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-16118' references: - url: 'https://access.redhat.com/errata/RHSA-2026:64799' label: secalert@redhat.com - url: 'https://access.redhat.com/errata/RHSA-2026:64800' label: secalert@redhat.com - url: 'https://access.redhat.com/errata/RHSA-2026:66451' label: secalert@redhat.com - url: 'https://access.redhat.com/errata/RHSA-2026:67956' label: secalert@redhat.com - url: 'https://access.redhat.com/errata/RHSA-2026:70636' label: secalert@redhat.com - url: 'https://access.redhat.com/errata/RHSA-2026:71403' label: secalert@redhat.com - url: 'https://access.redhat.com/errata/RHSA-2026:71404' label: secalert@redhat.com - url: 'https://access.redhat.com/errata/RHSA-2026:71405' label: secalert@redhat.com - url: 'https://access.redhat.com/security/cve/CVE-2026-16118' label: secalert@redhat.com - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2501732' label: secalert@redhat.com - url: 'https://gitlab.freedesktop.org/xdg/xdgmime/-/work_items/41' label: secalert@redhat.com - url: 'https://gitlab.freedesktop.org/xdg/xdgmime/-/work_items/41' label: 134c704f-9b21-4f2e-91b3-4a467353bcc0 - url: >- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-16118.json - url: 'https://www.cve.org/CVERecord?id=CVE-2026-16118' - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-16118' tags: - nvd - cve.org - exploit-available - csaf - vex - red-hat epss: 0.00267 epssPercentile: 0.1681 exploitAvailable: true ssvc: exploitation: poc automatable: 'no' technicalImpact: partial timestamp: '2026-07-22T18:18:50.584747Z' ingestedAt: '2026-09-04T04:14:25.433Z' --- ## Overview 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. ## Remediation Refer to the linked advisories for vendor-supplied fixes and affected version ranges. ## Vendor advisories - **RHSA-2026:64799** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream (v. 10), Red Hat Enterprise Linux BaseOS (v. 10), Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) · released 2026-09-08 · [advisory](https://access.redhat.com/errata/RHSA-2026:64799) - **RHSA-2026:64800** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream (v. 9), Red Hat Enterprise Linux BaseOS (v. 9), Red Hat Enterprise Linux CodeReady Linux Builder (v. 9) · released 2026-09-08 · [advisory](https://access.redhat.com/errata/RHSA-2026:64800) - **Red Hat VEX** · Moderate · affected: Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9 · no fix planned: Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9 · updated 2026-09-24 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-16118.json) - **RHSA-2026:66451** · Red Hat · fixed in: Red Hat Enterprise Linux BaseOS (v. 8), Red Hat Enterprise Linux CRB (v. 8) · released 2026-09-11 · [advisory](https://access.redhat.com/errata/RHSA-2026:66451) - **RHSA-2026:67956** · Red Hat · fixed in: Red Hat Update Infrastructure 5 · released 2026-09-16 · [advisory](https://access.redhat.com/errata/RHSA-2026:67956) - **RHSA-2026:70636** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream E4S (v.9.4), Red Hat Enterprise Linux BaseOS E4S (v.9.4) · released 2026-09-23 · [advisory](https://access.redhat.com/errata/RHSA-2026:70636) - **RHSA-2026:71404** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream EUS (v. 10.0), Red Hat Enterprise Linux BaseOS EUS (v. 10.0), Red Hat Enterprise Linux CodeReady Linux Builder EUS (v. 10.0) · released 2026-09-24 · [advisory](https://access.redhat.com/errata/RHSA-2026:71404) - **RHSA-2026:71405** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream E4S (v.9.2), Red Hat Enterprise Linux BaseOS E4S (v.9.2) · released 2026-09-24 · [advisory](https://access.redhat.com/errata/RHSA-2026:71405) - **RHSA-2026:71403** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream EUS (v.9.6), Red Hat Enterprise Linux BaseOS EUS (v.9.6), Red Hat CodeReady Linux Builder EUS (v.9.6) · released 2026-09-24 · [advisory](https://access.redhat.com/errata/RHSA-2026:71403)