CVE-2026-116740
libcss through 0.9.2 NULL Pointer Dereference via Media-Query Parser
CVSS Score
6.5
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-476 |
| Vendor | netsurf-browser |
| Product | libcss |
| Published | Oct 26, 2026 |
Stay Ahead of the Next One
Get instant alerts for netsurf-browser libcss
Be the first to know when new medium vulnerabilities affecting netsurf-browser libcss are published — delivered to Slack, Telegram or Discord.
Get Free Alerts →
Free · No credit card · 60 sec setup
CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
Required
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High
Affected Versions
netsurf-browser / libcss
0 ≤ 0.9.2
References
github.com: https://github.com/netsurf-browser/libcss/commit/006ffc4096040da13690abc380e5f828ec08284d github.com: https://github.com/netsurf-browser/libcss github.com: https://github.com/netsurf-browser/libcss/blob/release/0.9.2/src/parse/mq.c#L984 hackmd.io: https://hackmd.io/@haindpwn/libcss-media-list-null-deref vulncheck.com: https://www.vulncheck.com/advisories/libcss-through-0.9.2-null-pointer-dereference-via-media-query-parser
Credits
HaiND from the Post and Telecommunication Institute of Technology metan-ucw