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CVE-2026-76886Heap-based Buffer Overflow in Wireshark

C12.22 protocol dissector crash in 4.6.0 to 4.6.7 and 4.4.0 to 4.4.18 allows denial of service

9.8 CRITICALEPSS 0.38%Not in KEVNVD: Analyzed

Last updated: 2026-10-24 13:10 UTC

OverviewCVSS details

9.8CRITICALCVSS 3.1

Score source: NVD
NVD status: Analyzed
Published: Aug 19, 2026
Assigner: GitLab

Affected

Wireshark (Wireshark Foundation)

Versions: 4.6.0 before 4.6.8 · 4.4.0 before 4.4.18
Fixed in: 4.6.8, 4.4.18

Exploitation

Public exploit: Yes · 2 references
CISA KEV: Not listed
KEV due date: —
SSVC: Exploitation poc · Automatable no · Impact total

EPSS · FIRST, scored Nov 8

0.38%chance of exploitation in 30 days

Higher than 32.48% of CVEs

CVSS 3.1 · NVD

9.8Critical

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

Attack vector: Network
Attack complexity: Low
Privileges required: None
User interaction: None
Scope: Unchanged
Confidentiality impact: High
Integrity impact: High
Availability impact: High

CVSS 3.1 · GitLab (CNA)

8.1High

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

Attack vector: Network
Attack complexity: High
Privileges required: None
User interaction: None
Scope: Unchanged
Confidentiality impact: High
Integrity impact: High
Availability impact: High

NVD status: Analyzed

Overview Affected Products References

Overview

Severity

Score	Severity	Version	Vector String
9.8	CRITICAL	3.1NVD	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
8.1	HIGH	3.1GitLab (CNA)	CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

Details

CVE ID: CVE-2026-76886
Status: Analyzed
Assigner (CNA): GitLab
Published: Aug 19, 2026
Last modified: 2026-10-24 13:10 UTC
Weaknesses: CWE-122 · Heap-based Buffer Overflow

Sources

Refreshed hourly from the sources above. Last fetched 2026-11-09 11:14 UTC.