---
id: CVE-2026-76927
title: >-
  wireshark: Wireshark: Denial of Service vulnerability in H.245 protocol
  dissector (CVE-2026-76927)
summary: >-
  A flaw was found in Wireshark. A remote attacker could exploit a vulnerability
  in the H.245 protocol dissector. By crafting and sending malformed H.245
  protocol data, an attacker could cause the Wireshark application to crash when
  a user p…
severity: medium
cvss: 6.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H'
cvssSource: vendor
cwe: CWE-476
vendor: Red Hat
product: Red Hat Enterprise Linux AppStream (v. 8)
affected:
  - enterprise_linux 6
  - enterprise_linux 7
  - enterprise_linux_appstream_v_10
  - enterprise_linux_appstream_v_8
  - enterprise_linux_appstream_v_9
  - enterprise_linux_codeready_linux_builder_v_10
  - enterprise_linux_crb_v_8
  - enterprise_linux_codeready_linux_builder_v_9
patched:
  - enterprise_linux_appstream_v_10
  - enterprise_linux_appstream_v_8
  - enterprise_linux_appstream_v_9
  - enterprise_linux_codeready_linux_builder_v_10
  - enterprise_linux_crb_v_8
  - enterprise_linux_codeready_linux_builder_v_9
published: '2026-08-19'
updated: '2026-10-19'
sourceUpdated: '2026-10-19T08:24:01+00:00'
source: CSAF
sourceUrl: 'https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-76927.json'
references:
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-76927.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-76927'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2520103'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-76927'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-76927'
  - url: 'https://gitlab.com/wireshark/wireshark/-/work_items/21447'
  - url: 'https://www.wireshark.org/security/wnpa-sec-2026-77.html'
  - url: 'https://access.redhat.com/errata/RHSA-2026:84721'
  - url: 'https://access.redhat.com/errata/RHSA-2026:83657'
  - url: 'https://access.redhat.com/errata/RHSA-2026:83546'
tags:
  - csaf
  - vex
  - red-hat
  - cve.org
epss: 0.00184
epssPercentile: 0.07882
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-08-20T15:06:13.039044Z'
scores:
  vendor: 6.5
  cna: 4.7
ingestedAt: '2026-09-17T19:26:25.338Z'
---

## Overview

A flaw was found in Wireshark. A remote attacker could exploit a vulnerability in the H.245 protocol dissector. By crafting and sending malformed H.245 protocol data, an attacker could cause the Wireshark application to crash when a user processes this untrusted network data, leading to a denial of service.

## Vendor advisories

- **RHSA-2026:84721** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream (v. 10), Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) · released 2026-10-19 · [advisory](https://access.redhat.com/errata/RHSA-2026:84721)
- **RHSA-2026:83657** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream (v. 8), Red Hat Enterprise Linux CRB (v. 8) · released 2026-10-15 · [advisory](https://access.redhat.com/errata/RHSA-2026:83657)
- **RHSA-2026:83546** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream (v. 9), Red Hat Enterprise Linux CodeReady Linux Builder (v. 9) · released 2026-10-15 · [advisory](https://access.redhat.com/errata/RHSA-2026:83546)
- **Red Hat VEX** · Moderate · affected: Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 7 · no fix planned: Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 7 · updated 2026-10-19 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-76927.json)

**wireshark: Wireshark: Denial of Service vulnerability in H.245 protocol dissector** — rated Moderate by Red Hat. Released 2026-08-19, updated 2026-10-19.

Affected:

- Red Hat Enterprise Linux 6
- Red Hat Enterprise Linux 7

Fixed:

- Red Hat Enterprise Linux AppStream (v. 10)
- Red Hat Enterprise Linux AppStream (v. 8)
- Red Hat Enterprise Linux AppStream (v. 9)
- Red Hat Enterprise Linux CodeReady Linux Builder (v. 10)
- Red Hat Enterprise Linux CRB (v. 8)
- Red Hat Enterprise Linux CodeReady Linux Builder (v. 9)

No fix planned:

- Red Hat Enterprise Linux 6
- Red Hat Enterprise Linux 7

## Remediation

For details on how to apply this update, which includes the changes described in this advisory, refer to:

https://access.redhat.com/articles/11258 https://access.redhat.com/errata/RHSA-2026:84721
For details on how to apply this update, which includes the changes described in this advisory, refer to:

https://access.redhat.com/articles/11258 https://access.redhat.com/errata/RHSA-2026:83657
For details on how to apply this update, which includes the changes described in this advisory, refer to:

https://access.redhat.com/articles/11258 https://access.redhat.com/errata/RHSA-2026:83546

Workarounds / mitigations:

- To mitigate this issue, disable the H.245 protocol dissector by running tshark --disable-protocol h245 or unchecking H.245 under Analyze > Enabled Protocols. Additionally, avoid opening packet capture files from untrusted sources and restrict live capture to trusted networks using host firewalls. On systems where packet analysis is non-essential, remove the wireshark package entirely or restrict execution permissions strictly to authorized administrators.