CVE-2026-16118: Xdgmime: heap-based buffer overflow in _xdg_mime_magic_parse_magic_line() in xdgmimemagic.c

Severity: high (CVSS 7.1 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.2% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-07-17 · updated 2026-10-29
Weakness: CWE-122

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.

Affected products

Red Hat Cert Manager support for Red Hat OpenShift release 1.17: all versions — fixed in 1791371080
Red Hat Cert Manager support for Red Hat OpenShift release 1.18: all versions — fixed in 1791459707
Red Hat Cert Manager support for Red Hat OpenShift release 1.20: all versions — fixed in 1790223279
Red Hat AI Inference Server 3.2: all versions — fixed in 1790621714
Red Hat AI Inference Server 3.5: all versions — fixed in 1791425869
Red Hat Cost Management On-Premise 1: all versions — fixed in 1791460851
Red Hat Enterprise Linux 10: all versions — fixed in 0:2.80.4-12.el10_2.22
Red Hat Enterprise Linux 10.0 Extended Update Support: all versions — fixed in 0:2.80.4-4.el10_0.18
Red Hat Enterprise Linux 7: all versions
Red Hat Enterprise Linux 8: all versions — fixed in 0:2.56.4-178.el8_10
Red Hat Enterprise Linux 9: all versions — fixed in 0:2.68.4-19.el9_8.10
Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions: all versions — fixed in 0:2.68.4-7.el9_2.8
Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions: all versions — fixed in 0:2.68.4-14.el9_4.9
Red Hat Enterprise Linux 9.6 Extended Update Support: all versions — fixed in 0:2.68.4-16.el9_6.8
Red Hat Enterprise Linux AI 3.5: all versions — fixed in 1793206758
Red Hat OpenShift AI 3.0: all versions — fixed in 1790276886
Red Hat OpenShift AI 3.2: all versions — fixed in 1790703497
Red Hat OpenShift AI 3.3: all versions — fixed in 1790703615
Red Hat OpenShift AI 3.4: all versions — fixed in 1790703542
Red Hat OpenShift AI 3.5: all versions — fixed in 1790703552
Red Hat Update Infrastructure 5: all versions — fixed in 1789479916
xdgmime: all versions

How to fix

Upgrade to a fixed version: Red Hat Cert Manager support for Red Hat OpenShift release 1.17 1791371080; Red Hat Cert Manager support for Red Hat OpenShift release 1.18 1791459707; Red Hat Cert Manager support for Red Hat OpenShift release 1.20 1790223279; Red Hat AI Inference Server 3.2 1790621714; Red Hat AI Inference Server 3.5 1791425869; Red Hat Cost Management On-Premise 1 1791460851; Red Hat Enterprise Linux 10 0:2.80.4-12.el10_2.22; Red Hat Enterprise Linux 10.0 Extended Update Support 0:2.80.4-4.el10_0.18; Red Hat Enterprise Linux 8 0:2.56.4-178.el8_10; Red Hat Enterprise Linux 9 0:2.68.4-19.el9_8.10; Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions 0:2.68.4-7.el9_2.8; Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions 0:2.68.4-14.el9_4.9. Check the vendor advisory for mitigations.

References

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