CVE-2026-5402
Heap-based Buffer Overflow in Wireshark
HIGH
8.8
CVSS Score
Published: April 30, 2026 at 05:39 AM UTC
Updated: October 26, 2026 at 12:10 AM UTC
1 product affected across 1 vendorWireshark
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Severity
HIGH8.8
Exploit prediction
EPSS 0.4%
SSVC
No known exploit
Description
TLS protocol dissector heap overflow in Wireshark 4.6.0 to 4.6.4 allows denial of service and possible code execution
Affected
Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.
4.6.0 ≤ v ≤ 4.6.44.6.0
Affected range stops below 4.6.5, so it looks safe — our inference, not a vendor statement
Remediation
No guide yetNo remediation guidance has been written for this CVE yet. What the record does show:
Patch and advisory references
References (5)
Issue TrackingPermissions RequiredExploit
Source: cverecord
https://gitlab.com/wireshark/wireshark/-/issues/21090Source: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
https://access.redhat.com/security/cve/CVE-2026-5402Source: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
https://bugzilla.redhat.com/show_bug.cgi?id=2464038Source: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-5402.jsonSSVC — Action Prioritization
SSVCNo known exploitNot automatableTotal impact
SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.
CVSS
8.8HIGHGitLab
- Attack Vector
- NETWORK
- Complexity
- LOW
- Privileges
- NONE
- User Interaction
- REQUIRED
- Scope
- UNCHANGED
- Confidentiality
- HIGH
- Integrity
- HIGH
- Availability
- HIGH
Vector?
Quick Info
StatusMODIFIED
CWE
CWE-122
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