CVE-2026-6533

Dissection engine LZ77 decompression crash in Wireshark 4.6.0 to 4.6.4 and 4.4.0 to 4.4.14 allows denial of service

CVSS v3 5.5 MEDIUM

5.5^/10

CVSS v3 : MEDIUM

Vector :

Exploitability : 1.8 / Impact : 3.6

Attack Vector LOCAL

Attack Complexity LOW

Privileges Required NONE

User Interaction REQUIRED

Confidentiality Impact NONE

Integrity Impact NONE

Availability Impact HIGH

Scope UNCHANGED

References

Link	Resource
https://gitlab.com/wireshark/wireshark/-/issues/21127	Exploit Issue Tracking Third Party Advisory
https://www.wireshark.org/security/wnpa-sec-2026-28.html	Vendor Advisory
https://gitlab.com/wireshark/wireshark/-/work_items/21127	Exploit Issue Tracking Third Party Advisory

Configurations

Configuration 1 (hide)

OR	cpe:2.3:a:wireshark:wireshark::::::::
	cpe:2.3:a:wireshark:wireshark::::::::

History

No history.

Information

Published : 2026-04-30 07:16

Updated : 2026-06-17 11:00

NVD link : CVE-2026-6533

Mitre link : CVE-2026-6533

CVE.ORG link : CVE-2026-6533

JSON object : View

Products Affected

wireshark

wireshark

CWE

CWE-1325

Improperly Controlled Sequential Memory Allocation

{"id": "CVE-2026-6533", "cveTags": [], "metrics": {"ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-6533", "role": "CISA Coordinator", "options": [{"exploitation": "poc"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "version": "2.0.3", "timestamp": "2026-04-30T12:34:51.683809Z"}}], "cvssMetricV31": [{"type": "Secondary", "source": "cve@gitlab.com", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 5.5, "attackVector": "LOCAL", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H", "integrityImpact": "NONE", "userInteraction": "REQUIRED", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "NONE", "confidentialityImpact": "NONE"}, "impactScore": 3.6, "exploitabilityScore": 1.8}]}, "affected": [{"source": "cve@gitlab.com", "affectedData": [{"vendor": "Wireshark Foundation", "product": "Wireshark", "versions": [{"status": "affected", "version": "4.6.0", "lessThan": "4.6.5", "versionType": "semver"}, {"status": "affected", "version": "4.4.9", "lessThan": "4.4.15", "versionType": "semver"}], "defaultStatus": "unaffected"}]}], "published": "2026-04-30T07:16:40.627", "references": [{"url": "https://gitlab.com/wireshark/wireshark/-/issues/21127", "tags": ["Exploit", "Issue Tracking", "Third Party Advisory"], "source": "cve@gitlab.com"}, {"url": "https://www.wireshark.org/security/wnpa-sec-2026-28.html", "tags": ["Vendor Advisory"], "source": "cve@gitlab.com"}, {"url": "https://gitlab.com/wireshark/wireshark/-/work_items/21127", "tags": ["Exploit", "Issue Tracking", "Third Party Advisory"], "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0"}], "vulnStatus": "Analyzed", "weaknesses": [{"type": "Secondary", "source": "cve@gitlab.com", "description": [{"lang": "en", "value": "CWE-1325"}]}], "descriptions": [{"lang": "en", "value": "Dissection engine LZ77 decompression crash in Wireshark 4.6.0 to 4.6.4 and 4.4.0 to 4.4.14 allows denial of service"}], "lastModified": "2026-06-17T11:00:56.730", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:a:wireshark:wireshark:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "77CF79F1-B53C-40A7-9570-A192D5A85ED6", "versionEndIncluding": "4.4.14", "versionStartIncluding": "4.4.0"}, {"criteria": "cpe:2.3:a:wireshark:wireshark:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "B52139AE-161F-406A-B28D-F874CE8B68B6", "versionEndIncluding": "4.6.4", "versionStartIncluding": "4.6.0"}], "operator": "OR"}]}], "sourceIdentifier": "cve@gitlab.com"}