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Wireshark EUVDEUVD-2026-26345

| CVE-2026-6538 MEDIUM
Stack-based Buffer Overflow (CWE-121)
2026-04-30 GitLab
Buffer Overflow Denial Of Service Stack Overflow Wireshark Wireshark Foundation
5.5
CVSS 3.1 · Vendor: GitLab
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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata – not a confirmed exploit chain

  1. Access
    Attacker crafts malformed BEEP packet
  2. Delivery
    Delivers via file attachment or network traffic
  3. Exploit
    User opens file or captures traffic in Wireshark
  4. Execution
    BEEP dissector parses packet
  5. Persist
    Stack buffer overflow triggered
  6. Impact
    Wireshark process crashes

Vulnerability Assessment

Weakness
CWE
CWE-121
ASVS 5.0
V15 - Secure Coding and Architecture Stack buffer bounds checking
MITRE ATT&CK

1 technique across 1 tactic: Execution

The technique list with ATT&CK links and the kill-chain view is part of the Basic plan and up.

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Exploitation Conditions

The BEEP dissector must be enabled (default configuration in Wireshark). Exploitation requires either (1) a user with local system access running Wireshark and opening a malicious .pcap or .pcapng file, or (2) Wireshark capturing live network traffic containing the crafted BEEP packet on the same local network segment where the user is analyzing traffic. The attacker cannot exploit this remotely over a network-the local access vector and user interaction requirement (UI:R) mean the user must explicitly open a suspicious file or be passively capturing traffic on a monitored network. Non-default dissector configurations or filtering rules that exclude BEEP traffic prevent exploitation.
Impact

CVSS 5.5 with local attack vector and user interaction requirement significantly lowers real-world risk compared to network-vector vulnerabilities. EPSS data not provided, but the attack surface is limited: exploitation requires either (1) a user running Wireshark locally and opening a malicious packet capture file, or (2) live network traffic capture of crafted BEEP packets on the same system. The CVSS vector (AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H) confirms local-only access, no special privileges, and mandatory user interaction-these constraints substantially reduce priority compared to remote vectors. Denial of service impact is moderate; Wireshark crash does not affect other system functions or enable privilege escalation. Organizations using Wireshark in isolated analysis environments face lower risk than those relying on it for continuous production traffic analysis. KEV status unknown-no confirmation of active exploitation provided.
Exploit ScenarioDerived

An attacker crafts a BEEP protocol packet with a malformed frame structure (e.g., oversized payload header or invalid offset) and delivers it either as an attachment in a packet capture file sent to a Wireshark user, or via live network traffic on a monitored segment. When the user opens the file in Wireshark or the application processes the live traffic, the BEEP dissector parses the malformed packet, writes beyond the allocated stack buffer, and causes Wireshark to crash, disrupting the user's traffic analysis workflow.
This Month Plan within 30 days. Why: MEDIUM severity (CVSS 4.0-6.9).
Patch available 0.0% exploitation probability (EPSS)

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AnalysisAIv1 – Apr 30, 2026

Stack buffer overflow in Wireshark's BEEP protocol dissector causes denial of service when processing malformed network packets. Versions 4.6.0-4.6.4 and 4.4.0-4.4.14 are vulnerable; a local user with the ability to interact with Wireshark or supply crafted BEEP traffic can trigger a crash via a specially crafted packet that requires user interaction to open or process. No public exploit code or active exploitation has been identified at time of analysis.

RemediationAI

Update to Wireshark 4.6.5 or later, or to a patched version of the 4.4.x series if available (exact patched version not confirmed in provided data). Upgrade immediately if Wireshark is used for production traffic analysis or receives untrusted packet captures. As a temporary workaround pending patches, restrict BEEP traffic analysis in Wireshark by disabling the BEEP dissector in protocol preferences (Analyze → Enabled Protocols → uncheck BEEP), though this limits protocol visibility. Alternatively, process potentially malicious BEEP traffic in isolated sandbox environments with Wireshark running in a separate user context or virtual machine. Vendor advisory available at https://www.wireshark.org/security/wnpa-sec-2026-23.html; technical discussion and issue tracking at https://gitlab.com/wireshark/wireshark/-/issues/21120.

Affected VersionsENISA

Wireshark 4.4.0 <4.4.15
Wireshark 4.6.0 <4.6.5

Affected Packages

euvd wireshark fix: 4.4.15, 4.6.5

Source: OSV (Open Source Vulnerabilities)

Affects your stack

Affects 1 package in euvd

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Technical ContextAI · show details

Wireshark is a network protocol analyzer that uses protocol dissectors to parse and display captured traffic. The BEEP (Blocks Extensible Exchange Protocol, RFC 3080) dissector implements packet parsing for the BEEP protocol. CWE-121 (stack-based buffer overflow) indicates that the dissector writes beyond allocated stack memory when processing malformed BEEP frames, likely due to insufficient bounds checking on input length or offset values. The vulnerability exists in the dissector code responsible for parsing BEEP frame headers or payloads without proper validation of packet structure.

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  • Exploit and PoC references, threat intelligence from 22 sources
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Severity by source

Vendor (GitLab) PRIMARY 5.5 MEDIUM
AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
SUSE MEDIUM
Red Hat 6.5 MEDIUM

Primary rating from Vendor (GitLab).

CVSS VectorVendor: GitLab

Attack Vector
Local
Attack Complexity
Low
Privileges Required
None
User Interaction
Required
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

Lifecycle Timeline

3
Patch released
May 01, 2026 - 18:15 nvd
Patch available
Patch available
Apr 30, 2026 - 08:16 EUVD
CVE Published
Apr 30, 2026 - 05:38 nvd
MEDIUM 5.5

DescriptionCVE.org

BEEP protocol dissector crash in Wireshark 4.6.0 to 4.6.4 and 4.4.0 to 4.4.14 allows denial of service

Threat Intelligence Overview

EPSS Score
0.0%
Top 98% exploitable
Data Quality
7 sources
Confidence: High
EUVD NVD CVE.org EPSS Vulnrichment Vendor VulDB

How this decision was reached

The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.

SignalValue
Severity MEDIUM
CISA KEV No
Public POC No
EPSS 0.0%
Patch available Yes
Active threat No
Deciding rule
MEDIUM severity (CVSS 4.0-6.9)
What every action level means
Emergency Immediate action required. Criteria: CRITICAL + in CISA KEV (actively exploited) without patch, OR CRITICAL + EPSS > 30% without patch, OR CRITICAL + active threat signals without patch.
Act Now Prioritize within 24-48h. Criteria: in KEV with patch available, OR CRITICAL + public POC, OR HIGH + EPSS > 10%, OR CRITICAL + active threat, OR any CRITICAL severity.
This Week Schedule remediation this week. Criteria: HIGH severity (CVSS 7.0-8.9). Patch within normal change window.
This Month Plan within 30 days. Criteria: MEDIUM severity (CVSS 4.0-6.9), lower exploitation probability. Include in regular patch cycle.
Monitor Track and reassess. Criteria: LOW severity (CVSS 0.1-3.9), minimal exploitation risk. No immediate action needed.

SSVC AssessmentENISA

SSVC Decision· derived
Scheduled
Exploitation
Poc
System Exposure· derived
Small
Automatable
No
Human Impact· derived
Medium
Technical Impact
Partial

Priority Score

28
Low Medium High Critical
KEV: 0
EPSS: 0
CVSS: +28
PoC: 0
Weaponized: 0
Threat intel: 0
Gov advisory: 0

Attack Technique

Buffer Overflow HIGH

A buffer overflow occurs when a program writes more data to a memory buffer than it was allocated to hold, causing the excess data to spill into adjacent memory regions.

Stack-based Buffer Overflow HIGH

A stack-based buffer overflow occurs when a program writes more data to a buffer located on the stack than it was allocated to hold.

Denial of Service MEDIUM

Denial of Service attacks render applications or systems unavailable by overwhelming resources or triggering failure conditions.

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Same weakness CWE-121 – Stack-based Buffer Overflow

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Vendor StatusVendor

SUSE

Severity: Medium
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

References

Advisories & patches
ADVISORY https://vuldb.com/vuln/360286 REF https://gitlab.com/wireshark/wireshark/-/issues/21120 REF https://gitlab.com/wireshark/wireshark/-/work_items/21120 REF https://www.wireshark.org/security/wnpa-sec-2026-23.html

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