Vulnerability · Published Oct 26, 2026 · Assigned by VulnCheck
CVE-2026-116740libcss through 0.9.2 NULL Pointer Dereference via Media-Query Parser
Medium 6.5
In plain English
A medium-severity null pointer dereference in libcss from netsurf-browser. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 26% of all known vulnerabilities).
Severity (CVSS 3.1)6.5Medium
Exploit odds (30 days)0.3%top 74.1% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official 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.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| netsurf-browser | libcss | 0 – through 0.9.2 |
Weakness: CWE-476 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
References
- Patch Commit patch
- https://github.com/netsurf-browser/libcss product
- https://github.com/netsurf-browser/libcss/blob/release/0.9.2/src/parse/mq.c#L984 technical-description
- https://hackmd.io/@haindpwn/libcss-media-list-null-deref third-party-advisory
- VulnCheck Advisory: libcss through 0.9.2 NULL Pointer Dereference via Media-Query Parser third-party-advisory