CWE-476
NULL Pointer Dereference
The product dereferences a pointer that it expects to be valid but is NULL.
CVE-2026-9567 (GCVE-0-2026-9567)
Vulnerability from cvelistv5 – Published: 2026-05-26 17:45 – Updated: 2026-05-26 18:23 X_Open Source
VLAI
Title
GPAC MP4Box isom_intern.c MergeFragment null pointer dereference
Summary
A security flaw has been discovered in GPAC up to 2.4.0. Affected is the function MergeFragment of the file src/isomedia/isom_intern.c of the component MP4Box. The manipulation results in null pointer dereference. The attack needs to be approached locally. The exploit has been released to the public and may be used for attacks. The patch is identified as 525bf1af642c30af04e4df5345e6d798c0a4d8a1. It is advisable to implement a patch to correct this issue.
Severity
SSVC
Exploitation: poc
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
Assigner
References
7 references
| URL | Tags |
|---|---|
| https://vuldb.com/vuln/365629 | vdb-entrytechnical-description |
| https://vuldb.com/vuln/365629/cti | signaturepermissions-required |
| https://vuldb.com/submit/816075 | third-party-advisory |
| https://github.com/gpac/gpac/issues/3549 | issue-tracking |
| https://github.com/user-attachments/files/2719691… | exploit |
| https://github.com/makesoftwaresafe/gpac/commit/5… | patch |
| https://github.com/gpac/gpac/ | product |
Impacted products
Credits
{
"containers": {
"adp": [
{
"metrics": [
{
"other": {
"content": {
"id": "CVE-2026-9567",
"options": [
{
"Exploitation": "poc"
},
{
"Automatable": "no"
},
{
"Technical Impact": "partial"
}
],
"role": "CISA Coordinator",
"timestamp": "2026-05-26T18:22:53.401692Z",
"version": "2.0.3"
},
"type": "ssvc"
}
}
],
"providerMetadata": {
"dateUpdated": "2026-05-26T18:23:16.064Z",
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP"
},
"title": "CISA ADP Vulnrichment"
}
],
"cna": {
"affected": [
{
"cpes": [
"cpe:2.3:a:gpac:gpac:*:*:*:*:*:*:*:*"
],
"modules": [
"MP4Box"
],
"product": "GPAC",
"vendor": "n/a",
"versions": [
{
"status": "affected",
"version": "2.0"
},
{
"status": "affected",
"version": "2.1"
},
{
"status": "affected",
"version": "2.2"
},
{
"status": "affected",
"version": "2.3"
},
{
"status": "affected",
"version": "2.4.0"
}
]
}
],
"credits": [
{
"lang": "en",
"type": "reporter",
"value": "fczhang (VulDB User)"
}
],
"descriptions": [
{
"lang": "en",
"value": "A security flaw has been discovered in GPAC up to 2.4.0. Affected is the function MergeFragment of the file src/isomedia/isom_intern.c of the component MP4Box. The manipulation results in null pointer dereference. The attack needs to be approached locally. The exploit has been released to the public and may be used for attacks. The patch is identified as 525bf1af642c30af04e4df5345e6d798c0a4d8a1. It is advisable to implement a patch to correct this issue."
}
],
"metrics": [
{
"cvssV4_0": {
"baseScore": 4.8,
"baseSeverity": "MEDIUM",
"vectorString": "CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P",
"version": "4.0"
}
},
{
"cvssV3_1": {
"baseScore": 3.3,
"baseSeverity": "LOW",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L/E:P/RL:O/RC:C",
"version": "3.1"
}
},
{
"cvssV3_0": {
"baseScore": 3.3,
"baseSeverity": "LOW",
"vectorString": "CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L/E:P/RL:O/RC:C",
"version": "3.0"
}
},
{
"cvssV2_0": {
"baseScore": 1.7,
"vectorString": "AV:L/AC:L/Au:S/C:N/I:N/A:P/E:POC/RL:OF/RC:C",
"version": "2.0"
}
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-476",
"description": "NULL Pointer Dereference",
"lang": "en",
"type": "CWE"
}
]
},
{
"descriptions": [
{
"cweId": "CWE-404",
"description": "Denial of Service",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-05-26T17:45:10.365Z",
"orgId": "1af790b2-7ee1-4545-860a-a788eba489b5",
"shortName": "VulDB"
},
"references": [
{
"name": "VDB-365629 | GPAC MP4Box isom_intern.c MergeFragment null pointer dereference",
"tags": [
"vdb-entry",
"technical-description"
],
"url": "https://vuldb.com/vuln/365629"
},
{
"name": "VDB-365629 | CTI Indicators (IOB, IOC, IOA)",
"tags": [
"signature",
"permissions-required"
],
"url": "https://vuldb.com/vuln/365629/cti"
},
{
"name": "Submit #816075 | GPAC MP4Box \u003c= 2.4.0 (master commit 7508ccc and earlier) Null pointer dereference (Denial of Service)",
"tags": [
"third-party-advisory"
],
"url": "https://vuldb.com/submit/816075"
},
{
"tags": [
"issue-tracking"
],
"url": "https://github.com/gpac/gpac/issues/3549"
},
{
"tags": [
"exploit"
],
"url": "https://github.com/user-attachments/files/27196918/poc.zip"
},
{
"tags": [
"patch"
],
"url": "https://github.com/makesoftwaresafe/gpac/commit/525bf1af642c30af04e4df5345e6d798c0a4d8a1"
},
{
"tags": [
"product"
],
"url": "https://github.com/gpac/gpac/"
}
],
"tags": [
"x_open-source"
],
"timeline": [
{
"lang": "en",
"time": "2026-05-26T00:00:00.000Z",
"value": "Advisory disclosed"
},
{
"lang": "en",
"time": "2026-05-26T02:00:00.000Z",
"value": "VulDB entry created"
},
{
"lang": "en",
"time": "2026-05-26T12:57:31.000Z",
"value": "VulDB entry last update"
}
],
"title": "GPAC MP4Box isom_intern.c MergeFragment null pointer dereference"
}
},
"cveMetadata": {
"assignerOrgId": "1af790b2-7ee1-4545-860a-a788eba489b5",
"assignerShortName": "VulDB",
"cveId": "CVE-2026-9567",
"datePublished": "2026-05-26T17:45:10.365Z",
"dateReserved": "2026-05-26T10:52:27.927Z",
"dateUpdated": "2026-05-26T18:23:16.064Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
CVE-2026-9759 (GCVE-0-2026-9759)
Vulnerability from cvelistv5 – Published: 2026-05-27 18:33 – Updated: 2026-05-27 19:36
VLAI
Title
NULL Pointer Dereference in Wireshark
Summary
ROHC protocol dissector crash in Wireshark 4.6.0 to 4.6.5 and 4.4.0 to 4.4.15 allows denial of service
Severity
5.5 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-476 - NULL Pointer Dereference
Assigner
References
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Wireshark Foundation | Wireshark |
Affected:
4.6.0 , < 4.6.6
(semver)
Affected: 4.4.0 , < 4.4.16 (semver) |
Credits
{
"containers": {
"adp": [
{
"metrics": [
{
"other": {
"content": {
"id": "CVE-2026-9759",
"options": [
{
"Exploitation": "none"
},
{
"Automatable": "no"
},
{
"Technical Impact": "partial"
}
],
"role": "CISA Coordinator",
"timestamp": "2026-05-27T19:35:43.254414Z",
"version": "2.0.3"
},
"type": "ssvc"
}
}
],
"providerMetadata": {
"dateUpdated": "2026-05-27T19:36:26.557Z",
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP"
},
"title": "CISA ADP Vulnrichment"
}
],
"cna": {
"affected": [
{
"defaultStatus": "unaffected",
"product": "Wireshark",
"vendor": "Wireshark Foundation",
"versions": [
{
"lessThan": "4.6.6",
"status": "affected",
"version": "4.6.0",
"versionType": "semver"
},
{
"lessThan": "4.4.16",
"status": "affected",
"version": "4.4.0",
"versionType": "semver"
}
]
}
],
"credits": [
{
"lang": "en",
"type": "finder",
"value": "Arjun Basnet @ Securin Labs"
}
],
"descriptions": [
{
"lang": "en",
"value": "ROHC protocol dissector crash in Wireshark 4.6.0 to 4.6.5 and 4.4.0 to 4.4.15 allows denial of service"
}
],
"metrics": [
{
"cvssV3_1": {
"attackComplexity": "LOW",
"attackVector": "LOCAL",
"availabilityImpact": "HIGH",
"baseScore": 5.5,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "REQUIRED",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H",
"version": "3.1"
},
"format": "CVSS",
"scenarios": [
{
"lang": "en",
"value": "GENERAL"
}
]
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-476",
"description": "CWE-476: NULL Pointer Dereference",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-05-27T18:33:18.742Z",
"orgId": "ceab7361-8a18-47b1-92ba-4d7d25f6715a",
"shortName": "GitLab"
},
"references": [
{
"url": "https://www.wireshark.org/security/wnpa-sec-2026-51.html"
},
{
"url": "https://gitlab.com/wireshark/wireshark/-/work_items/21243"
}
],
"solutions": [
{
"lang": "en",
"value": "Upgrade to Wireshark 4.6.6 or above"
}
],
"title": "NULL Pointer Dereference in Wireshark"
}
},
"cveMetadata": {
"assignerOrgId": "ceab7361-8a18-47b1-92ba-4d7d25f6715a",
"assignerShortName": "GitLab",
"cveId": "CVE-2026-9759",
"datePublished": "2026-05-27T18:33:18.742Z",
"dateReserved": "2026-05-27T18:16:39.521Z",
"dateUpdated": "2026-05-27T19:36:26.557Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
Mitigation ID: MIT-56
Phase: Implementation
Description:
- For any pointers that could have been modified or provided from a function that can return NULL, check the pointer for NULL before use. When working with a multithreaded or otherwise asynchronous environment, ensure that proper locking APIs are used to lock before the check, and unlock when it has finished [REF-1484].
Mitigation
Phase: Requirements
Description:
- Select a programming language that is not susceptible to these issues.
Mitigation
Phase: Implementation
Description:
- Check the results of all functions that return a value and verify that the value is non-null before acting upon it.
Mitigation
Phase: Architecture and Design
Description:
- Identify all variables and data stores that receive information from external sources, and apply input validation to make sure that they are only initialized to expected values.
Mitigation
Phase: Implementation
Description:
- Explicitly initialize all variables and other data stores, either during declaration or just before the first usage.
No CAPEC attack patterns related to this CWE.