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CVE Record

CVE-2026-5405: Heap-based Buffer Overflow in Wireshark

RDP protocol dissector 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

HighCVSS 7.8Not KEV-listedUpdated
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Glexia's TakeAutomated analysishigh

Security readout for executives and security teams

Plain-English summary

CVE-2026-5405 is a high-severity Wireshark flaw in the RDP protocol dissector. A user who opens or inspects crafted RDP traffic could trigger a crash, and the CVE description says code execution may be possible. This mainly affects analysts, administrators, and automated systems that process packet captures.

Executive priority

Treat as a near-term remediation item for security teams. The business risk is concentrated in tools used to inspect network evidence, where a malicious capture could disrupt analysis or possibly run code.

Technical view

Wireshark versions 4.6.0 through 4.6.4 and 4.4.0 through 4.4.14 are reported affected. The issue is a heap-based buffer overflow, CWE-122, in RDP dissection. CVSS 3.1 is 7.8 with local attack vector and required user interaction, but confidentiality, integrity, and availability impacts are marked high.

Likely exposure

Exposure is most likely on analyst workstations, SOC tooling, training labs, and servers that open packet captures or decode live traffic with affected Wireshark builds.

Exploitation context

The bundle does not show CISA KEV listing or confirmed active exploitation. Exploitation requires local processing and user interaction, such as opening crafted traffic for analysis.

Researcher notes

Evidence supports affected version ranges, CWE-122, CVSS 7.8, denial of service, and possible code execution. The provided bundle does not include exploit details, proof of active exploitation, or exact fixed upstream version text.

Mitigation direction

  • Identify Wireshark 4.6.0-4.6.4 and 4.4.0-4.4.14 installations.
  • Apply Wireshark or operating-system vendor updates from official advisories.
  • Follow Red Hat errata where Wireshark is supplied by Red Hat packages.
  • Avoid opening untrusted RDP captures until affected systems are updated.
  • Review vendor guidance for any temporary workaround not shown here.

Validation and detection

  • Inventory Wireshark versions on analyst endpoints and shared analysis hosts.
  • Check package-manager advisory status against Red Hat errata where applicable.
  • Confirm updated systems are outside the affected version ranges.
  • Review workflows that automatically process uploaded packet captures.
  • Record whether RDP dissection is used in security analysis pipelines.
Prepared
Confidence
medium
Sources
7

Public sources used

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

Conservative CVE-to-ATT&CK context

These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.

ATT&CK lookup starting points

Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.

cwe · low confidence lookup

CWE-122: Exact CWE lookup

Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.

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description · low confidence lookup

Execution behavior lookup

The CVE wording references code or command execution, so execution technique review may help defensive triage. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.

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cve · low confidence lookup

CVE-2026-5405 mapping review

Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.

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Vulnerability profileCVE Program record
Severity
High
CVSS
7.8 (3.1)
Known Exploited
No
Published

Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

2CVSS vectors
5Timeline events
2ADP providers
8Source links

SSVC decision data

CISA-ADPCISA Coordinator
Timestamp
Version
2.0.3
Exploitation: noneAutomatable: noTechnical Impact: total

CVSS vector scores

2 official scores

We collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.

ScoreVersionSeverityVectorExploitImpactSource
7.8CVSS 3.1HighCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H1.85.9GitLab
7.8CVSS 3.1HighCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H1.85.9redhat-SADP

Vulnerability scoring details

Base CVSS 3.1 score

7.8High
CVSS 3.1 vector shape for CVE-2026-5405Attack VectorAttack ComplexityPrivileges RequiredUser InteractionScopeConfidentiality ImpactIntegrity ImpactAvailability Impact

Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Attack Vector
NetworkAdjacentLocalPhysical
Attack Complexity
LowHigh
Privileges Required
NoneLowHigh
User Interaction
NoneRequired
Scope
ChangedUnchanged
Confidentiality Impact
HighLowNone
Integrity Impact
HighLowNone
Availability Impact
HighLowNone

Vulnerability timeline

Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.

  1. CVE reservedCVE Program

    The CVE ID was reserved by the assigning CNA.

  2. ADP timelineredhat-SADP

    Made public.

  3. CVE publishedCVE Program

    The CVE record was published.

  4. ADP timelineredhat-SADP

    Reported to Red Hat.

  5. CVE updatedCVE Program

    The CVE record metadata indicates this as the latest update time.

ADP provider summaries

CISA-ADPCISA ADP Vulnrichment
other:ssvc
redhat-SADPwireshark: Heap-based Buffer Overflow in Wireshark
other:Red Hat severity ratingcvssV3_1
  • 2026-05-01T00:01:04.898Z: Reported to Red Hat.
  • 2026-04-30T23:03:53.654Z: Made public.

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
Wireshark FoundationWireshark4.6.0, 4.4.0unaffected
Weakness

CWE details

CWE-122

CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.

CWE-122 · source CWE mapping

Heap-based Buffer Overflow

Heap-based Buffer Overflow represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.

Open CWE intelligenceSame-CWE CVEs