CVE-2026-76885Network attack vector

Application crash via K12xx parser over-read

Published Aug 19, 2026 · Updated Aug 20, 2026

Buffer over-read in Wireshark's Tektronix K12xx file parser before 4.6.8 and 4.4.18 allows attackers to crash the application via a malformed capture file. Public records identify a buffer over-read in the K12xx reader, but neither the Wireshark advisory nor the CVE record discloses the specific function or missing bounds check that reads past packet-capture data. Exploitation requires user interaction because a target must open the crafted file, and the published impact is limited to an application crash rather than code execution or data exposure.

CVSS severity3.1
Low
EPSS probability0.19%
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's Tektronix K12xx file parser before 4.6.8 and 4.4.18 allows attackers to crash the application via a malformed capture file. Public records identify a buffer over-read in the K12xx reader, but neither the Wireshark advisory nor the CVE record discloses the specific function or missing bounds check that reads past packet-capture data. Exploitation requires user interaction because a target must open the crafted file, and the published impact is limited to an application crash rather than code execution or data exposure.

The record

CVE
CVE-2026-76885
Published
Aug 19, 2026
Updated
Aug 20, 2026
Vendor
Wireshark Foundation
Product
Wireshark
Classifications
CWE-126, T1204.002
Attack vector
network
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

Compare your product and version with the public record. A matching version still requires validation against your environment.

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 vectornetwork
Required privilegesunauthenticated

What is affected?

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

Published CVSS scores

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

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 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 exploitUnconfirmed

Weakness, pattern, technique

CWE-126Buffer Over-read
T1204.002User Execution: Malicious File

Public exploit references

No public exploit references are available in this record.

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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