Heap-based Buffer Overflow in Wireshark
Priority LOW 32CWE-122Published · Updated
Key facts
- Attack vector
- Local
- Privileges required
- None
- User interaction
- Required
- Attack complexity
- Low
- Impact type
- —
- Confidentiality · integrity · availability
- High · 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.
Summary
X11 protocol dissector crash in 4.6.0 to 4.6.8 and 4.4.0 to 4.4.18 allows denial of service
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00141 3rd percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Partial Wireshark (Wireshark Foundation): 4.6.9, 4.4.19Red Hat: 1 without a fix
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- Technical impact
- Total
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 4.6.9; 4.4.0 to before 4.4.19 | 4.6.9, 4.4.19 | Patch available | CNA |
- Wireshark VendorWireshark Foundation Affected 4.6.0 to before 4.6.9; 4.4.0 to before 4.4.19 Fixed in 4.6.9, 4.4.19 Patch available CNA
CPE configurations NVD · 1
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:wireshark:wireshark:*:*:*:*:*:*:*:* | 4.4.0 to before 4.4.19; 4.6.0 to before 4.6.9 | Vulnerable | Wireshark Foundation |
- cpe:2.3:a:wireshark:wireshark:*:*:*:*:*:*:*:* Versions 4.4.0 to before 4.4.19; 4.6.0 to before 4.6.9 Vulnerable ·Wireshark Foundation
Remediation
- Fix · CNA Wireshark (Wireshark Foundation) Fixed in 4.6.9, 4.4.19
Fixed in the same release
Records fixed by the same vendor advisory or release, as the CNA lists them.
- Release ·
Wireshark 4.4.19, 4.6.9
16 records Highest priority Priority HIGH 3 HIGH, 10 MEDIUM, 3 LOW
Other records, highest priority first
- TI-2026-63612 Heap-based Buffer Overflow in WiresharkPriority HIGH 73
- TI-2026-63614 Heap-based Buffer Overflow in WiresharkPriority HIGH 70
- TI-2026-63770 Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal') in WiresharkPriority HIGH 67
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-2026-96423
- 2026-10-03 Alias added: GHSA-969r-pwxc-fjq2
- 2026-10-06 CVSS score added · NVD
- 2026-10-06 Weakness changed · NVD
- 2026-10-14 CISA SSVC decision points changed
- 2026-10-14 Priority changed: MEDIUM → LOW
- 2026-11-03 CISA SSVC decision points changed
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-2026-96423 · CVE Program
- CVE-2026-96423 · NVD
- FIRST EPSS
- GHSA-969r-pwxc-fjq2 · GitHub Advisory Database · CC BY 4.0
- CVE-2026-96423 · Red Hat security data · CC BY 4.0
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