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CVE-2026-96423

Heap-based Buffer Overflow in Wireshark

Products / packages Wireshark Foundation Wireshark

Published

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Severity and exploitation

Not in CISA KEV

KEV coverage does not rule out exploitation.

KEV checked 14/11/2026, 21:45:32 UTC
GitLab · CVSS:3.1 · 5.5
Assessment vectorCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

Severity

medium5.5

CVSS measures technical severity, not the likelihood of an attack.

Known exploitation

Not listed in the checked CISA KEV catalog

Absence from CISA KEV does not rule out attacks.

Public exploit

Exploit reference published

Source-linked evidence; not proof of attacks in the wild or independent validation.

Remediation

Source guidance available

Review the recorded instructions. Guidance may be a workaround rather than a fixed version.

What this means

Wireshark versions 4.6.0 to 4.6.8 and 4.4.0 to 4.4.18 have a heap-based buffer overflow weakness in the X11 protocol dissector, allowing denial of service. The vulnerability requires access to the X11 protocol dissector. The stated impact is a crash.

Summarized by @cf/meta/llama-3.3-70b-instruct-fp8-fast. Verify details against the original sources.

Attack conditions

No attack-condition excerpt has been identified here. Review the full source description and references for authentication, network access, and configuration requirements.

Review supporting sources →

Affected versions

Check the exact model, release, and any platform requirements against your installation.

Wireshark Foundation · GitLab

Wireshark

2 ranges
GitLab version evidence

Compare with this publisher’s ranges. This does not inspect your installation.

affected

4.6.0 → before 4.6.9

semver versions

4.4.0 → before 4.4.19

semver versions

unaffected

unknown

Other versions: unaffected

Automatic dependency matching is unavailable for this record. Use the product evidence and publisher’s instructions to check your installation.

What to do

Compare your installed product and version with the affected versions above. A matching product name alone does not confirm exposure.

Upgrade to version 4.6.9 or above

GitLab guidance ↗

cve.new guidance unless attributed to a publisher. This page does not inspect your installation.

Public exploit evidence

The sources identify public exploit references. We have not independently tested them; their availability does not establish exploitation in the wild.

gitlab.com/wireshark/wireshark/-/work_items/21563 ↗Attributed to CISA-ADP

Original source description

Read the full publisher description

X11 protocol dissector crash in 4.6.0 to 4.6.8 and 4.4.0 to 4.4.18 allows denial of service

References

2 sources
www.wireshark.org/security/wnpa-sec-2026-108.html
Security advisoryGitLab
gitlab.com/wireshark/wireshark/-/work_items/21563
Public exploit referenceGitLab · CISA-ADP

Inside the record

Evidence available

Package identity · not supplied
Version evidence
Remediation guidance
Weakness classification
Additional publishers

Describes the evidence in this view, not whether the product is safe.

Original records

CVE-2026-96423

View the latest unmodified CVE JSON from the official source. It may be newer than this imported page.

cve.new JSON →

Underlying weaknesses

The source’s classification of what caused the vulnerability.

CWE-122 ↗

CWE-122: Heap-based Buffer Overflow

GitLab

Related →
Contributing organizations · 2
GitLab

Assigning organization

2026-09-29
CISA-ADP

Additional data publisher

2026-11-03

Timeline

All times UTC

  1. Advisory published

    Publication date supplied by the source.

  2. Source updated

    Latest modification date supplied by the source.

  3. Last imported by cve.new

    Latest catalog import, not the date we first saw this advisory.

What changed

Follow changes
No substantive changes have been recorded here yet. History starts when cve.new observes a change after tracking is enabled; earlier edits are not reconstructed.

Large field values are marked as truncated previews. Original source snapshots remain retained.