CVE-2026-76883Public exploit

Crash via DCT2000 parser off-by-one write

Published Aug 19, 2026 · Updated Aug 20, 2026

Heap-based buffer overflow in Wireshark 4.6.0 through 4.6.7 and 4.4.0 through 4.4.17 allows attackers to crash it via a malformed DCT2000 file. In wiretap/catapult_dct2000.c parse_line(), the reader allocates data_chars/2 bytes for decoded input but writes ceil(data_chars/2) bytes when the hex data length is odd, causing a one-byte heap out-of-bounds write. Exploitation requires opening a crafted capture file in Wireshark or TShark, and published material describes a crash rather than code execution or data exposure.

CVSS severity4.7
Medium
EPSS probability0.10%
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 4.6.0 through 4.6.7 and 4.4.0 through 4.4.17 allows attackers to crash it via a malformed DCT2000 file. In wiretap/catapult_dct2000.c parse_line(), the reader allocates data_chars/2 bytes for decoded input but writes ceil(data_chars/2) bytes when the hex data length is odd, causing a one-byte heap out-of-bounds write. Exploitation requires opening a crafted capture file in Wireshark or TShark, and published material describes a crash rather than code execution or data exposure.

The record

CVE
CVE-2026-76883
Published
Aug 19, 2026
Updated
Aug 20, 2026
Vendor
Wireshark Foundation
Product
Wireshark
Classifications
CWE-122, T1204.002
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 19, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 20, 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 <4.4.18
  2. Affected versionversion=4.6.0 <4.6.8

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

Wireshark Foundation · Wiresharkversion=4.4.0 <4.4.18; version=4.6.0 <4.6.8

Published CVSS scores

4.7GitLab Inc.CVSS:3.1/AV:L/AC:H/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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-122Heap-based Buffer Overflow
T1204.002Malicious File

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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