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TI-2026-80949 Aliases CVE-2026-116740GHSA-gmc2-wjcf-43vw

NULL pointer dereference in libcss media query parser

Priority LOW 31CWE-476Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
Passive
Attack complexity
Low
Attack requirements
None
Impact type
Denial of service
Confidentiality · integrity · availability
None · None · High
Fix status
No fix listed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-476.

Summary

libcss through 0.9.2 contains a NULL pointer dereference (CWE-476) in mq_parse_media_query(). A remote attacker who serves a stylesheet whose @media or @import media list ends in a comma can crash consumers such as NetSurf or other parsers.

Written with Claude Haiku 5.5 from the sources below · 2026-10-31

Description from the CNA

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00327 25th percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
netsurf-browserlibcssup to 0.9.2—No fix listedCNA
  • libcss Vendornetsurf-browser Affected up to 0.9.2 Fixed in — No fix listed CNA

Remediation

The sources list no fixed version for libcss.

Written with Claude Haiku 5.5 from the sources below · 2026-10-31

Vendor assessments

Red Hat

Red Hat's page for this CVE →

Not affected: 1 product
  • Red Hat

Timeline

  1. 2026-10-26 Threatist record created from CVE-2026-116740
  2. 2026-10-27 Affected versions changed · Red Hat
  3. 2026-10-27 CVSS score added · Red Hat
  4. 2026-10-27 Alias added: GHSA-gmc2-wjcf-43vw
  5. 2026-10-27 Priority changed: MEDIUM → LOW
  6. 2026-10-31 CISA SSVC decision points changed

References

Patch 1

Advisory 1

Other 2

  • TI-2015-06246 Out-of-bounds write in Libnsbmp CVSS 3.1HIGH 8.8
  • TI-2015-06243 Out-of-bounds write in Libnsgif CVSS 3.1HIGH 8.8
  • TI-2024-34321 An issue in NetSurf v.3.11 allows a remote attacker to execute arbitrary code via the dom_node_normalize function CVSS 3.1MEDIUM 6.5
  • TI-2015-06245 Out-of-bounds read in Libnsbmp CVSS 3.1HIGH 7.5
  • TI-2015-06244 Out-of-bounds read in Libnsgif CVSS 3.1MEDIUM 6.5
  • TI-2025-28823 An issue in NetSurf v3.11 causes the application to read uninitialized heap memory when creating a dom_event structure. CVSS 3.1MEDIUM 6.5
See all 8 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences