NULL Pointer Dereference in Wireshark
Priority MEDIUM 58CWE-476Published · Updated
Key facts
- Attack vector
- Local
- Privileges required
- None
- User interaction
- Required
- Attack complexity
- Low
- Impact type
- Denial of service
- Confidentiality · integrity · availability
- None · None · High
- Fix status
- Partial Red Hat: 1 without a fix
Attack profile from CVSS 3.1 · NVD. Fix status from CNA and Red Hat. Impact type from CWE-476.
Summary
CMS protocol dissector crash in 4.6.0 to 4.6.7 and 4.4.0 to 4.4.18 allows denial of service
Why it matters now
Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00138 3rd percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Partial Wireshark (Wireshark Foundation): 4.6.8, 4.4.18Red Hat: 1 without a fix
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- Poc
- 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
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| Wireshark Foundation | Wireshark | 4.6.0 to before 4.6.8; 4.4.0 to before 4.4.18 | 4.6.8, 4.4.18 | Patch available | CNA |
- Wireshark VendorWireshark Foundation Affected 4.6.0 to before 4.6.8; 4.4.0 to before 4.4.18 Fixed in 4.6.8, 4.4.18 Patch available CNA
CPE configurations NVD · 1
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:wireshark:wireshark:*:*:*:*:*:*:*:* | 4.4.0 to before 4.4.18; 4.6.0 to before 4.6.8 | Vulnerable | Wireshark Foundation |
- cpe:2.3:a:wireshark:wireshark:*:*:*:*:*:*:*:* Versions 4.4.0 to before 4.4.18; 4.6.0 to before 4.6.8 Vulnerable ·Wireshark Foundation
Remediation
- Fix · CNA Wireshark (Wireshark Foundation) Fixed in 4.6.8, 4.4.18
Fixed in the same release
Records fixed by the same vendor advisory or release, as the CNA lists them.
- Release ·
Wireshark 4.4.18, 4.6.8
25 records Highest priority Priority HIGH 2 HIGH, 4 MEDIUM, 19 LOW
Other records, highest priority first
- TI-2026-53718 Heap-based Buffer Overflow in WiresharkPriority HIGH 76
- TI-2026-53720 Heap-based Buffer Overflow in WiresharkPriority HIGH 66
- TI-2026-53716 Buffer Over-read in WiresharkPriority MEDIUM 62
Vendor assessments
Red Hat
Red Hat rating: Moderate. Red Hat's page for this CVE →
| Product | Status | Plan or fix |
|---|---|---|
| Red Hat Enterprise Linux 10 | Affected | No fix yet: Fix deferred |
Not affected: 4 products
- Red Hat Enterprise Linux 6
- Red Hat Enterprise Linux 7
- Red Hat Enterprise Linux 8
- Red Hat Enterprise Linux 9
Timeline
- 2026-10-02 Threatist record created from CVE-2026-76881
- 2026-10-03 Alias added: GHSA-qqq4-v263-8jqw
References
More Wireshark Foundation Wireshark vulnerabilities
- TI-2026-53718 Heap-based Buffer Overflow in Wireshark CVSS 3.1CRITICAL 9.8
- TI-2026-63612 Heap-based Buffer Overflow in Wireshark CVSS 3.1HIGH 8.8
- TI-2024-16149 A buffer overflow in Wireshark before 4.2.0 allows a remote attacker to cause a denial of… CVSS 3.1HIGH 7.5
- TI-2010-00291 Multiple buffer overflows in the LWRES dissector in Wireshark 0.9.15 through 1.0.10 and… CVSS 2.0HIGH 7.5
- TI-2026-63614 Heap-based Buffer Overflow in Wireshark CVSS 3.1HIGH 8.1
- TI-2014-01823 Buffer overflow in the mpeg_read function in wiretap/mpeg.c in the MPEG parser in… CVSS 2.0HIGH 9.3
Sources
- CVE-2026-76881 · CVE Program
- CVE-2026-76881 · NVD
- FIRST EPSS
- GHSA-qqq4-v263-8jqw · GitHub Advisory Database · CC BY 4.0
- CVE-2026-76881 · Red Hat security data · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences