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.

Attack Vector Network

Attack Complexity Low

Privileges Required None

Attack Requirements None

User Interaction Passive

Vulnerable System Confidentiality Impact None

Vulnerable System Integrity Impact None

Vulnerable System Availability Impact High

Subsequent System Confidentiality Impact None

Subsequent System Integrity Impact None

Subsequent System Availability Impact None

Attack Vector Network

Attack Complexity Low

Privileges Required None

Scope Unchanged

Confidentiality Impact None

Integrity Impact None

Availability Impact High

User Interaction Required

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

The EPSS score is 0.00327.

Key SSVC decision points have not yet been added.

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions
netsurf-browser libcss unaffected
Version Status Constraints
0 affected ≤ 0.9.2

No data.

No data.

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Project Subscriptions

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Advisories

No advisories yet.

Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

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

Tue, 27 Oct 2026 04:30:00 +0000

Type Values Removed Values Added
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.
Title libcss through 0.9.2 NULL Pointer Dereference via Media-Query Parser
Weaknesses CWE-476
References
Metrics cvssV3_1

{'score': 6.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H'}

cvssV4_0

{'score': 7.1, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N'}

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: VulnCheck

Published:

Updated: 2026-10-26T21:52:39.177Z

Reserved: 2026-10-26T20:23:36.353Z

Link: CVE-2026-116740

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Deferred

Published: 2026-10-26T22:16:58.390

Modified: 2026-10-27T16:04:22.707

Link: CVE-2026-116740

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-10-27T08:15:15Z

Weaknesses