CVE-2026-16118
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…
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (0.24%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
Description
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.
- CVSS 3.1
- 7.1 HIGHCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:H
- EPSS
- 0.24% probability · 16th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-122
- Source
- secalert@redhat.com
References
- https://access.redhat.com/errata/RHSA-2026:64799
- https://access.redhat.com/errata/RHSA-2026:64800
- https://access.redhat.com/errata/RHSA-2026:66451
- https://access.redhat.com/security/cve/CVE-2026-16118
- https://bugzilla.redhat.com/show_bug.cgi?id=2501732
- https://gitlab.freedesktop.org/xdg/xdgmime/-/work_items/41
- https://gitlab.freedesktop.org/xdg/xdgmime/-/work_items/41
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.