CVE-2026-5653Public exploitNetwork attack vector

Analyzer crash via undersized Reed-Solomon output buffer

Published Apr 30, 2026 · Updated Apr 30, 2026

Heap-based buffer overflow in Wireshark 4.4.0 through 4.4.14 and 4.6.0 through 4.6.4 allows attackers to crash the analyzer. The DCP-ETSI PFT Reed-Solomon path gives eras_dec_rs a fixed 255-byte block while allocating only fcount × plen bytes, so decoded data overruns the heap buffer. The flaw triggers when the last crafted FEC-enabled UDP fragment is captured or a user opens a malicious trace, interrupting Wireshark or TShark.

CVSS severity5.5
Medium
EPSS probability0.21%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Heap-based buffer overflow in Wireshark 4.4.0 through 4.4.14 and 4.6.0 through 4.6.4 allows attackers to crash the analyzer. The DCP-ETSI PFT Reed-Solomon path gives eras_dec_rs a fixed 255-byte block while allocating only fcount × plen bytes, so decoded data overruns the heap buffer. The flaw triggers when the last crafted FEC-enabled UDP fragment is captured or a user opens a malicious trace, interrupting Wireshark or TShark.

The record

CVE
CVE-2026-5653
Published
Apr 30, 2026
Updated
Apr 30, 2026
Vendor
Wireshark Foundation
Product
Wireshark
Classifications
CWE-122, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 30, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 30, 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 <4.4.15
  2. Affected versionversion=4.6.0 <4.6.5

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Wireshark Foundation · Wiresharkversion=4.4.0 <4.4.15; version=4.6.0 <4.6.5

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)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-122Heap-based Buffer Overflow
T1499.004Application or System Exploitation

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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