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CVE-2026-76921— Use After Free in Wireshark

Quick assessment

Affected
Wireshark Foundation Wireshark
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Wireshark是Wireshark组织开源的一款网络协议分析工具。 Wireshark 4.6.0至4.6.7版本和4.4.0至4.4.18版本存在资源管理错误漏洞，该漏洞源于CMS协议解析器崩溃，可能导致拒绝服务。

CVSS 5.5 · Medium EPSS 0.12% · P2

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service

Affected Version Matrix 2

VendorProduct Version RangeStatus
Wireshark Foundation Wireshark 4.6.0< 4.6.8 affected
4.4.0< 4.4.18 affected
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I. Basic Information for CVE-2026-76921

Vulnerability Information
Have questions about the vulnerability? See if Shenlong's analysis helps!
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Vulnerability Title
Use After Free in Wireshark
Source: CVE Program / CVE List V5
Vulnerability Description
CMS protocol dissector crash in 4.6.0 to 4.6.7 and 4.4.0 to 4.4.18 allows denial of service
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
释放后使用
Source: CVE Program / CVE List V5
Vulnerability Title
Wireshark 资源管理错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Wireshark是Wireshark组织开源的一款网络协议分析工具。 Wireshark 4.6.0至4.6.7版本和4.4.0至4.4.18版本存在资源管理错误漏洞，该漏洞源于CMS协议解析器崩溃，可能导致拒绝服务。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Wireshark Foundation Wireshark 4.6.0 ~ 4.6.8 -

II. Public POCs for CVE-2026-76921

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III. Intelligence Information for CVE-2026-76921

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Vendor Advisories for CVE-2026-76921 (1)

Other References for CVE-2026-76921 (2)

Same Patch Batch · Wireshark Foundation · 2026-08-19 · 25 CVEs total

CVE-2026-76886 8.1 HIGH Heap-based Buffer Overflow in Wireshark
CVE-2026-76928 7.5 HIGH NULL Pointer Dereference in Wireshark
CVE-2026-76879 7.5 HIGH Stack-based Buffer Overflow in Wireshark
CVE-2026-76880 7.5 HIGH Out-of-bounds Write in Wireshark
CVE-2026-76924 5.5 MEDIUM Out-of-bounds Read in Wireshark
CVE-2026-76918 5.5 MEDIUM Heap-based Buffer Overflow in Wireshark
CVE-2026-76917 5.5 MEDIUM Heap-based Buffer Overflow in Wireshark
CVE-2026-76923 5.5 MEDIUM Out-of-bounds Read in Wireshark
CVE-2026-76922 5.5 MEDIUM NULL Pointer Dereference in Wireshark
CVE-2026-76919 5.3 MEDIUM Use of Uninitialized Variable in Wireshark
CVE-2026-76920 4.7 MEDIUM Out-of-bounds Write in Wireshark
CVE-2026-76929 4.7 MEDIUM Out-of-bounds Read in Wireshark
CVE-2026-76927 4.7 MEDIUM NULL Pointer Dereference in Wireshark
CVE-2026-76882 4.7 MEDIUM Out-of-bounds Read in Wireshark
CVE-2026-76883 4.7 MEDIUM Heap-based Buffer Overflow in Wireshark
CVE-2026-76889 4.7 MEDIUM Heap-based Buffer Overflow in Wireshark
CVE-2026-76881 4.7 MEDIUM NULL Pointer Dereference in Wireshark
CVE-2026-76888 3.1 LOW Heap-based Buffer Overflow in Wireshark
CVE-2026-76891 3.1 LOW Expired Pointer Dereference in Wireshark
CVE-2026-76885 3.1 LOW Buffer Over-read in Wireshark

Showing top 20 of 25 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Wireshark
Same vendor: Wireshark Foundation
Same weakness: CWE-416

V. Comments for CVE-2026-76921

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