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Wireshark CVE-2026-5403

HIGH
Heap-based Buffer Overflow (CWE-122)
2026-04-30 GitLab
RCE Denial Of Service Buffer Overflow Heap Overflow Wireshark
7.8
CVSS 3.1 · Vendor: GitLab
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Severity by source

Vendor (GitLab) PRIMARY
7.8 HIGH
AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
SUSE
HIGH
qualitative
Red Hat
7.8 HIGH
qualitative

Primary rating from Vendor (GitLab).

CVSS VectorVendor: GitLab

CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Attack Vector
Local
Attack Complexity
Low
Privileges Required
None
User Interaction
Required
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

Lifecycle Timeline

3
Analysis Generated
Apr 30, 2026 - 23:45 vuln.today
Analysis Generated
Apr 30, 2026 - 23:30 vuln.today
CVE Published
Apr 30, 2026 - 23:04 nvd
HIGH 7.8

DescriptionCVE.org

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

AnalysisAI

Heap buffer overflow in Wireshark's SBC codec handler enables local code execution when processing malicious capture files. Affects Wireshark versions 4.4.0-4.4.14 and 4.6.0-4.6.4. The vulnerability requires user interaction (opening a crafted packet capture file) but no authentication, posing significant risk to network analysts who routinely process captures from untrusted sources. Wireshark Foundation has published security advisory WNPA-sec-2026-16 with remediation details. EPSS probability data not available; no evidence of active exploitation (not in CISA KEV) or public proof-of-concept at time of analysis.

Technical ContextAI

This vulnerability affects the Bluetooth SBC (Sub-Band Codec) dissector in Wireshark, a network protocol analyzer used extensively for traffic analysis and troubleshooting. The root cause is a heap-based buffer overflow (CWE-122), occurring when the SBC codec parser processes malformed audio codec data within captured network traffic. Heap overflows allow attackers to overwrite adjacent memory structures, potentially hijacking program execution flow. The affected CPE (cpe:2.3:a:wireshark_foundation:wireshark) confirms the Wireshark Foundation's network analysis application across two major version branches: the 4.4.x stable series (4.4.0-4.4.14) and the newer 4.6.x series (4.6.0-4.6.4). The SBC codec is typically found in Bluetooth audio profiles (A2DP), making this vulnerability triggerable through packet captures containing Bluetooth traffic or specifically crafted PCAP files designed to exploit the parser weakness.

RemediationAI

Upgrade to patched Wireshark versions as specified in WNPA-sec-2026-16 advisory (https://www.wireshark.org/security/wnpa-sec-2026-16.html). Based on version numbering patterns, likely fixed versions are 4.4.15+ and 4.6.5+, though exact patch versions should be confirmed from the vendor advisory. Organizations unable to immediately patch should implement strict PCAP file handling policies: disable automatic protocol dissectors for untrusted capture files using Wireshark's 'Analyze → Enabled Protocols' to deselect Bluetooth SBC, restrict capture file sources to known-trusted origins, and process suspicious captures in isolated sandboxed environments or virtual machines without network access. The trade-off for disabling SBC dissection is loss of detailed Bluetooth audio codec analysis capability, which may impact investigations requiring Bluetooth traffic inspection. Security operations teams should establish quarantine procedures for externally sourced capture files until verification or until upgrades are completed.

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Same weakness CWE-122 – Heap-based Buffer Overflow

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Same technique RCE

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Vendor StatusVendor

SUSE

Severity: High
Product Status
openSUSE Tumbleweed Fixed
SUSE Linux Enterprise Desktop 15 SP7 Fixed
SUSE Linux Enterprise High Performance Computing 15 SP7 Fixed
SUSE Linux Enterprise Module for Basesystem 15 SP7 Fixed
SUSE Linux Enterprise Module for Desktop Applications 15 SP7 Fixed

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CVE-2026-5403 vulnerability details – vuln.today
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