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

Quick assessment

Affected
xdg xdgmime
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

NLnet xdgmime是NLDNLnet组织的一款Web组件。 NLnet xdgmime存在缓冲区错误漏洞，该漏洞源于在进行字节交换时写入侧指针运算不正确，当应用程序解析攻击者控制的MIME magic文件时，触发_xdg_mime_magic_parse_magic_line()中的堆缓冲区溢出，可能导致应用程序崩溃或内存损坏。

CVSS 7.1 · High EPSS 0.13% · P3

Affected Version Matrix 6

VendorProduct Version RangeStatus
Red Hat Red Hat Enterprise Linux 10 any affected
Red Hat Red Hat Enterprise Linux 7 any affected
Red Hat Red Hat Enterprise Linux 8 any affected
Red Hat Red Hat Enterprise Linux 9 any affected
any affected
xdg xdgmime any affected
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I. Basic Information for CVE-2026-16118

Vulnerability Information
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Vulnerability Title
Xdgmime: heap-based buffer overflow in _xdg_mime_magic_parse_magic_line() in xdgmimemagic.c
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
堆缓冲区溢出
Source: CVE Program / CVE List V5
Vulnerability Title
NLnet xdgmime 缓冲区错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
NLnet xdgmime是NLDNLnet组织的一款Web组件。 NLnet xdgmime存在缓冲区错误漏洞，该漏洞源于在进行字节交换时写入侧指针运算不正确，当应用程序解析攻击者控制的MIME magic文件时，触发_xdg_mime_magic_parse_magic_line()中的堆缓冲区溢出，可能导致应用程序崩溃或内存损坏。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
xdg xdgmime - -
Red Hat Red Hat Enterprise Linux 10 - cpe:/o:redhat:enterprise_linux:10
Red Hat Red Hat Enterprise Linux 7 - cpe:/o:redhat:enterprise_linux:7
Red Hat Red Hat Enterprise Linux 8 - cpe:/o:redhat:enterprise_linux:8
Red Hat Red Hat Enterprise Linux 9 - cpe:/o:redhat:enterprise_linux:9
Red Hat Red Hat Enterprise Linux 9 - cpe:/o:redhat:enterprise_linux:9

II. Public POCs for CVE-2026-16118

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III. Intelligence Information for CVE-2026-16118

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Vendor Advisories for CVE-2026-16118 (2)

Other References for CVE-2026-16118 (1)

IV. Related Vulnerabilities

Same weakness: CWE-122

V. Comments for CVE-2026-16118

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