CVE-2026-116740 libcss through 0.9.2 NULL Pointer Dereference via Media-Query Parser
High 7.1
Published
Updated
Check this codebase for CVE-2026-116740 and fix it if it is affected.
What it is: CVE-2026-116740 is a high-severity vulnerability in netsurf-browser libcss, published on 26 Oct 2026.
Exploitation: There is no known exploitation of CVE-2026-116740 in the wild and no public exploit code.
Affected product: netsurf-browser libcss. No package-level version data is available, so check the vendor advisory linked from the reference page.
Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.
Reference: https://insights.sbomify.com/CVE-2026-116740/ (Markdown: https://insights.sbomify.com/CVE-2026-116740/index.md)
- Exploited in the wild
- Not known
- Fix
- None listed
What is CVE-2026-116740?
CVE-2026-116740 is a high-severity vulnerability in netsurf-browser libcss, published on 26 Oct 2026.
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.
Weakness: CWE-476
Which versions are affected by CVE-2026-116740?
How do I fix CVE-2026-116740?
No fix has been published for CVE-2026-116740 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-116740 being exploited?
There is no known exploitation of CVE-2026-116740 in the wild and no public exploit code.
Sources
Also known as GHSA-gmc2-wjcf-43vw.