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CVE-2026-116740— libcss through 0.9.2 NULL Pointer Dereference via Media-Query Parser

Quick assessment

Affected
netsurf-browser libcss
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.

libcss 0.9.2 及之前版本在 函数中存在空指针解引用漏洞。远程攻击者可通过提供以逗号结尾的媒体列表，导致消费者程序崩溃。攻击者可提供包含 或 媒体列表且末尾带有逗号的样式表，从而引发 NetSurf 或其他解析器崩溃。

CVSS 6.5 · Medium

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2026-116740

Vulnerability Information
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Vulnerability Title
libcss through 0.9.2 NULL Pointer Dereference via Media-Query Parser
Source: CVE Program / CVE List V5
Vulnerability Description
libcss through 0.9.2 contains a NULL pointer dereference vulnerability in mq_parse_media_query() that allows remote attackers to crash consumers by supplying media lists ending in a comma. Attackers can serve a stylesheet whose @media or @import media list has a trailing comma, causing NetSurf or other parsers to crash.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
空指针解引用
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
netsurf-browser libcss 0 ~ 0.9.2 -

II. Public POCs for CVE-2026-116740

# POC Description Source Link Shenlong Link
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III. Intelligence Information for CVE-2026-116740

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Patches & Fixes for CVE-2026-116740 (1)

Vendor Advisories for CVE-2026-116740 (1)

Security Blog Posts for CVE-2026-116740 (1)

Vendor Pages for CVE-2026-116740 (1)

IV. Related Vulnerabilities

Same weakness: CWE-476