Heap-based Buffer Overflow in Wireshark
Priority MEDIUM 40CWE-122Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- Required
- Attack complexity
- Low
- Impact type
- Code execution
- Confidentiality · integrity · availability
- High · High · High
- Fix status
- Fixed
Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-122 and the CVSS impact.
Summary
TLS protocol dissector heap overflow in Wireshark 4.6.0 to 4.6.4 allows denial of service and possible code execution
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.0039 33rd percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Fixed Wireshark (Wireshark Foundation): 4.6.5
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 4.6.5 | 4.6.5 | Patch available | CNA |
- Wireshark VendorWireshark Foundation Affected 4.6.0 to before 4.6.5 Fixed in 4.6.5 Patch available CNA
CPE configurations NVD · 1
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:wireshark:wireshark:*:*:*:*:*:*:*:* | 4.6.0 – 4.6.4 | Vulnerable | Wireshark Foundation |
- cpe:2.3:a:wireshark:wireshark:*:*:*:*:*:*:*:* Versions 4.6.0 – 4.6.4 Vulnerable ·Wireshark Foundation
Remediation
- Fix · CNA Wireshark (Wireshark Foundation) Fixed in 4.6.5
Fixed in the same release
Records fixed by the same vendor advisory or release, as the CNA lists them.
- Release ·
Wireshark 4.6.5
5 records Highest priority Priority HIGH 1 HIGH, 2 MEDIUM, 2 LOW
Other records, highest priority first
- TI-2026-04963 Use After Free in WiresharkPriority HIGH 66
- TI-2026-05731 Loop with Unreachable Exit Condition ('Infinite Loop') in WiresharkPriority MEDIUM 58
- TI-2026-05723 Loop with Unreachable Exit Condition ('Infinite Loop') in WiresharkPriority LOW 24
Vendor assessments
Red Hat
Red Hat rating: Important. Red Hat's page for this CVE →
Not affected: 5 products
- Red Hat Enterprise Linux 10
- 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-2026-5402
- 2026-10-03 Alias added: GHSA-f6fp-9f7c-rfwv
- 2026-10-14 EPSS moved to the 50th–90th percentile
- 2026-10-25 EPSS moved to the below the 50th percentile
References
Exploit 1
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-2026-5402 · CVE Program
- CVE-2026-5402 · NVD
- FIRST EPSS
- GHSA-f6fp-9f7c-rfwv · GitHub Advisory Database · CC BY 4.0
- CVE-2026-5402 · 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