CVE-2026-3203Public exploit

Application crash via RF4CE buffer over-read

Published Feb 25, 2026 · Updated Feb 25, 2026

Buffer over-read in Wireshark 4.6.0 through 4.6.3 and 4.4.0 through 4.4.13 allows attackers to crash the application via malformed RF4CE data. The RF4CE decryption path passes malformed packet data to zbee_sec_ccm_decrypt, where memcpy reads beyond the source buffer and terminates under AddressSanitizer. Reachability requires injecting a malformed packet onto the monitored wire or persuading a user to open a malformed trace; the bounded consequence is an application crash.

CVSS severity5.5
Medium
EPSS probability0.16%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Buffer over-read in Wireshark 4.6.0 through 4.6.3 and 4.4.0 through 4.4.13 allows attackers to crash the application via malformed RF4CE data. The RF4CE decryption path passes malformed packet data to zbee_sec_ccm_decrypt, where memcpy reads beyond the source buffer and terminates under AddressSanitizer. Reachability requires injecting a malformed packet onto the monitored wire or persuading a user to open a malformed trace; the bounded consequence is an application crash.

The record

CVE
CVE-2026-3203
Published
Feb 25, 2026
Updated
Feb 25, 2026
Vendor
Wireshark Foundation
Product
Wireshark
Classifications
CWE-126, T1499
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 25, 2026CVE publishedPublication date reported by the CVE source.
  2. Feb 25, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=4.4.0 <4.4.14
  2. Affected versionversion=4.6.0 <4.6.4

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

Wireshark Foundation · Wiresharkversion=4.4.0 <4.4.14; version=4.6.0 <4.6.4

Published CVSS scores

7.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
5.5GitLab Inc.CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-126Buffer Over-read
T1499Endpoint Denial of Service

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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