CVE-2026-116740

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.

CVSS 4.0

7.1CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

CVSS 3.1

6.5CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

CWE

CWE-476

Published

2026-10-26

Modified

2026-10-26

Record from

the NVD, synced 2026-10-26

References

• https://github.com/netsurf-browser/libcss
• https://github.com/netsurf-browser/libcss/blob/release/0.9.2/src/parse/mq.c#L984
• https://github.com/netsurf-browser/libcss/commit/006ffc4096040da13690abc380e5f828ec08284d
• https://hackmd.io/@haindpwn/libcss-media-list-null-deref
• https://www.vulncheck.com/advisories/libcss-through-0.9.2-null-pointer-dereference-via-media-query-parser

Check your stackJSON