Heap-based Buffer Overflow in Wireshark
Published Apr 30, 2026
7.8
HIGHCVSS 3.1
EPSS 0.19%
Description
SBC codec crash in Wireshark 4.6.0 to 4.6.4 and 4.4.0 to 4.4.14 allows denial of service and possible code execution
Affected products
-
- Version 4.4.0StatusaffectedConstraints<4.4.15
- Version 4.6.0StatusaffectedConstraints<4.6.5
- Version
Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).
| Vendor | Product | Default status | Versions | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Wireshark Foundation | Wireshark | unaffected |
|
No data.
Red Hat Enterprise Linux 10
wireshark
Will not fix
Red Hat Enterprise Linux 6
wireshark
Not affected
Red Hat Enterprise Linux 7
wireshark
Not affected
Red Hat Enterprise Linux 8
wireshark
Not affected
Red Hat Enterprise Linux 9
wireshark
Not affected
| Product | Package | State | Advisory |
|---|---|---|---|
| Red Hat Enterprise Linux 10 | wireshark | Will not fix | n/a |
| Red Hat Enterprise Linux 6 | wireshark | Not affected | n/a |
| Red Hat Enterprise Linux 7 | wireshark | Not affected | n/a |
| Red Hat Enterprise Linux 8 | wireshark | Not affected | n/a |
| Red Hat Enterprise Linux 9 | wireshark | Not affected | n/a |
No package ranges for this CVE.
Remediation
Vendor solution
Upgrade to version 4.6.5 or above
Red Hat statement
This issue will cause a crash in Wireshark and potentially result in code execution. This flaw can only be exploited when a malformed pcap file is processed. Due to these reasons, this vulnerability has been rated with an important severity.
Red Hat mitigation
If the SBC audio codec dissector is not being used, it can be disabled via the "Enabled Protocols" dialog box in the Wireshark GUI application. This will also disable the protocol dissector when using "tshark", the command line tool. See the links below for instructions to disable a protocol in Wireshark, specifically the "Control Protocol Dissection" section and the "disabled_protos" configuration file option. https://www.wireshark.org/docs/wsug_html_chunked/ChCustProtocolDissectionSection.html https://www.wireshark.org/docs/wsug_html_chunked/ChAppFilesConfigurationSection.html
Metrics
No CVSS v4.0 score for this CVE.
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
No CVSS v3.0 score for this CVE.
No CVSS v2.0 score for this CVE.
This CVE is not in the KEV list.
CISA SSVC (Vulnrichment)
Stakeholder-Specific Vulnerability Categorization from CISA ADP.
Exploitation
NoneAutomatable
NoTechnical Impact
TotalDecision
n/aAssessed May 1, 2026 · SSVC 2.0.3
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 4, 2026.
Score over time
May-Oct 2026- EPSS v4
- EPSS v5
Percentile over time
- EPSS v4
- EPSS v5
Table of values (3 key points)
Flat stretches are collapsed. Showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 4, 2026 | 0.19% (0.00188) | 7.55th | v5 (v2026.06.15) |
| Jun 15, 2026 | 0.15% (0.00148) | 4.37th | v5 (v2026.06.15) |
| May 1, 2026 | 0.01% (0.00014) | 2.71th | v4 (v2025.03.14) |
References (7)
- https://access.redhat.com/security/cve/CVE-2026-5403 Vendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=2464271 Issue Tracking
- https://gitlab.com/wireshark/wireshark/-/issues/21103 issue-trackingpermissions-requiredExploitIssue TrackingThird Party Advisory
- https://nvd.nist.gov/vuln/detail/CVE-2026-5403
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-5403.json
- https://www.cve.org/CVERecord?id=CVE-2026-5403
- https://www.wireshark.org/security/wnpa-sec-2026-16.html Vendor Advisory
| Link | Providers | Tags |
|---|---|---|
| https://access.redhat.com/security/cve/CVE-2026-5403 | Vendor Advisory | |
| https://bugzilla.redhat.com/show_bug.cgi?id=2464271 | Issue Tracking | |
| https://gitlab.com/wireshark/wireshark/-/issues/21103 | issue-trackingpermissions-requiredExploitIssue TrackingThird Party Advisory | |
| https://nvd.nist.gov/vuln/detail/CVE-2026-5403 | ||
| https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-5403.json | ||
| https://www.cve.org/CVERecord?id=CVE-2026-5403 | ||
| https://www.wireshark.org/security/wnpa-sec-2026-16.html | Vendor Advisory |
Change history (0)
No recorded changes yet.