CVE-2026-76880Network attack vector

Denial of service via unchecked RB-Identity index

Published Aug 19, 2026 · Updated Aug 20, 2026

Out-of-bounds write in Wireshark 4.4.0 through 4.4.17 and 4.6.0 through 4.6.7 allows attackers to crash its RRC dissector via malformed packets. A packet-controlled RB-Identity value is stored in UMTS RRC private state and later used directly as an index into rrc_ciphering_info.seq_no, even though that array dimension is smaller than the ASN.1 range, causing heap corruption during dissection. Reachability depends on injected network traffic or a crafted capture file being opened, and the published impact is application crash rather than code execution.

CVSS severity7.5
High
EPSS probability0.24%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Out-of-bounds write in Wireshark 4.4.0 through 4.4.17 and 4.6.0 through 4.6.7 allows attackers to crash its RRC dissector via malformed packets. A packet-controlled RB-Identity value is stored in UMTS RRC private state and later used directly as an index into rrc_ciphering_info.seq_no, even though that array dimension is smaller than the ASN.1 range, causing heap corruption during dissection. Reachability depends on injected network traffic or a crafted capture file being opened, and the published impact is application crash rather than code execution.

The record

CVE
CVE-2026-76880
Published
Aug 19, 2026
Updated
Aug 20, 2026
Vendor
Wireshark Foundation
Product
Wireshark
Classifications
CWE-787, T1499
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

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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 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

7.5GitLab Inc.CVSS:3.1/AV:N/AC:L/PR:N/UI:N/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 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-787Out-of-bounds Write
T1499Endpoint Denial of Service

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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