CWE-476
NULL Pointer Dereference
The product dereferences a pointer that it expects to be valid but is NULL.
CVE-2026-44710 (GCVE-0-2026-44710)
Vulnerability from cvelistv5 – Published: 2026-05-27 20:19 – Updated: 2026-05-28 13:05
VLAI
Title
pam_usb: NULL pointer dereference from UDisks device fields causes PAM crash and login denial-of-service
Summary
pam_usb provides hardware authentication for Linux using ordinary removable media. Prior to 0.8.7, src/device.c passed the return values of udisks_drive_get_serial(), udisks_drive_get_vendor(), and udisks_drive_get_model() directly to strcmp() without NULL checks. The GIO/UDisks API documentation states these accessors can return NULL for devices that do not expose the corresponding field. Passing NULL to strcmp() is undefined behaviour (typically a SIGSEGV). This vulnerability is fixed in 0.8.7.
Severity
4.6 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-476 - NULL Pointer Dereference
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://github.com/mcdope/pam_usb/security/adviso… | x_refsource_CONFIRM |
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CVE-2026-45104 (GCVE-0-2026-45104)
Vulnerability from cvelistv5 – Published: 2026-05-27 18:41 – Updated: 2026-06-01 17:08
VLAI
Title
MapServer: NULL pointer dereference in SLD `<ElseFilter>` rule parsing reachable via WMS `SLD_BODY`
Summary
MapServer is a system for developing web-based GIS applications. From 6.4.0 to before 8.6.3, msSLDParseUserStyle always calls _SLDApplyRuleValues(psRule, psLayer, 1); for any <Rule> carrying <ElseFilter/> — it assumes msSLDParseRule added one class. When the rule has no symbolizer (a structurally valid SLD), msSLDParseRule adds zero, and _SLDApplyRuleValues ends up indexing _class[-1], resulting in a NULL pointer dereference. A 200-byte well-formed SLD via the WMS SLD_BODY= parameter is enough to trigger this, no auth required. This vulnerability is fixed in 8.6.3.
Severity
7.5 (High)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator (v2.0.3)
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://github.com/MapServer/MapServer/security/a… | x_refsource_CONFIRM |
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CVE-2026-45151 (GCVE-0-2026-45151)
Vulnerability from cvelistv5 – Published: 2026-05-29 19:30 – Updated: 2026-06-01 13:54
VLAI
Title
NanoMQ: NULL Pointer Dereference
Summary
NanoMQ MQTT Broker (NanoMQ) is an all-around Edge Messaging Platform. In 0.24.8 and earlier, quic_stream_recv can dereference a null substream pointer when a substream is in reopen state. The code finishes the AIO with error but does not return before locking c->mtx.
Severity
SSVC
Exploitation: poc
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-476 - NULL Pointer Dereference
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://github.com/nanomq/nanomq/security/advisor… | x_refsource_CONFIRM |
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CVE-2026-45729 (GCVE-0-2026-45729)
Vulnerability from cvelistv5 – Published: 2026-06-01 17:18 – Updated: 2026-06-02 15:31
VLAI
Title
ThorVG: Null pointer dereference in SVG loader causes crash via 6-byte malformed input
Summary
Thor Vector Graphics (ThorVG) is a production-ready vector graphics engine. Prior to version 1.0.5, a null pointer dereference in SvgLoader::run() allows any caller that passes untrusted SVG data to Picture::load() to crash the process with a 6-byte payload. This issue has been patched in version 1.0.5.
Severity
4.3 (Medium)
SSVC
Exploitation: poc
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-476 - NULL Pointer Dereference
Assigner
References
4 references
| URL | Tags |
|---|---|
| https://github.com/thorvg/thorvg/security/advisor… | x_refsource_CONFIRM |
| https://github.com/thorvg/thorvg/pull/4387 | x_refsource_MISC |
| https://github.com/thorvg/thorvg/commit/159f44fd5… | x_refsource_MISC |
| https://github.com/thorvg/thorvg/releases/tag/v1.0.5 | x_refsource_MISC |
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CVE-2026-4652 (GCVE-0-2026-4652)
Vulnerability from cvelistv5 – Published: 2026-03-26 06:15 – Updated: 2026-03-26 13:31
VLAI
Title
Remote denial of service via null pointer dereference
Summary
On a system exposing an NVMe/TCP target, a remote client can trigger a kernel panic by sending a CONNECT command for an I/O queue with a bogus or stale CNTLID.
An attacker with network access to the NVMe/TCP target can trigger an unauthenticated Denial of Service condition on the affected machine.
Severity
7.5 (High)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-476 - NULL Pointer Dereference
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://security.freebsd.org/advisories/FreeBSD-S… | vendor-advisory |
Impacted products
Date Public
2026-03-26 05:00
Credits
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CVE-2026-46527 (GCVE-0-2026-46527)
Vulnerability from cvelistv5 – Published: 2026-05-29 19:18 – Updated: 2026-06-01 13:52
VLAI
Title
cpp-httplib: Malicious `X-Forwarded-For` Under Trusted-Proxy Configuration Triggers Empty `vector::front()`, Leading to Undefined Behavior and Server Crash
Summary
cpp-httplib is a C++11 single-file header-only cross platform HTTP/HTTPS library. Prior to 0.44.0, When the server has called Server::set_trusted_proxies() with a non-empty trusted-proxy list, an attacker can send an HTTP request that includes an X-Forwarded-For header whose value parses to no valid IP segments. The code path then executes get_client_ip(), which calls front() on an empty std::vector—undefined behavior in C++. On typical implementations this manifests as abnormal process termination (denial of service). With Sanitizers enabled, you get an explicit runtime diagnostic. This vulnerability is fixed in 0.44.0.
Severity
SSVC
Exploitation: poc
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-476 - NULL Pointer Dereference
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://github.com/yhirose/cpp-httplib/security/a… | x_refsource_CONFIRM |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| yhirose | cpp-httplib |
Affected:
< 0.44.0
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CVE-2026-47271 (GCVE-0-2026-47271)
Vulnerability from cvelistv5 – Published: 2026-05-27 20:08 – Updated: 2026-05-28 13:38
VLAI
Title
pam_usb: OOM guards removed by -DNDEBUG cause NULL dereference and authentication process crash
Summary
pam_usb provides hardware authentication for Linux using ordinary removable media. Prior to 0.9.0, src/mem.c implemented out-of-memory guards for xmalloc(), xrealloc(), and xstrdup() using assert(data != NULL). The C standard specifies that all assert() expressions are compiled out when NDEBUG is defined at build time. NDEBUG is commonly defined in release and packaging builds (Debian, Fedora, Arch package flags all define it via -DNDEBUG in CFLAGS). With the guard removed, xmalloc/xrealloc/xstrdup silently return NULL on allocation failure. Every caller in the codebase dereferences the return value without a NULL check -- this is the intended design, as the guard was supposed to abort before the dereference. With the guard gone, any allocation failure causes a NULL pointer dereference, crashing the PAM module. A crash in a PAM module loaded by sudo or login causes authentication to fail for the duration of the crash, creating a local denial-of-service condition. An attacker who can induce memory pressure at authentication time can lock all users out of sudo and login. This vulnerability is fixed in 0.9.0.
Severity
5.1 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-476 - NULL Pointer Dereference
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://github.com/mcdope/pam_usb/security/adviso… | x_refsource_CONFIRM |
| https://github.com/mcdope/pam_usb/commit/d003e551… | x_refsource_MISC |
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CVE-2026-47307 (GCVE-0-2026-47307)
Vulnerability from cvelistv5 – Published: 2026-05-19 02:51 – Updated: 2026-05-19 12:44
VLAI
Summary
NULL pointer dereference vulnerability in Samsung Open Source Walrus allows an attacker to cause a denial of service via a crafted WebAssembly module containing deeply nested instructions.
This issue affects Walrus: f339b8ee4ea701772e8ae640b3d1b12ac02b1ae9.
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
1 reference
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Samsung Open Source | Walrus |
Affected:
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CVE-2026-47308 (GCVE-0-2026-47308)
Vulnerability from cvelistv5 – Published: 2026-05-19 04:17 – Updated: 2026-05-19 12:38
VLAI
Summary
NULL pointer dereference vulnerability in Samsung Open Source Walrus allows Pointer Manipulation.
This issue affects Walrus: f339b8ee4ea701772e8ae640b3d1b12ac02b1ae9.
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
1 reference
Impacted products
1 product
| Vendor | Product | Version | |
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| Samsung Open Source | Walrus |
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CVE-2026-47327 (GCVE-0-2026-47327)
Vulnerability from cvelistv5 – Published: 2026-05-28 18:27 – Updated: 2026-05-28 19:25
VLAI
Title
NULL pointer dereference in Ubuntu Linux AppArmor notification handling
Summary
Ubuntu Linux 6.8, 6.17 and 7.0 contain SAUCE patches with a possible NULL pointer dereference in the handling of AppArmor notifications. The bug can be triggered by an unprivileged local user. This can lead to a kernel oops.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-476 - NULL pointer dereference
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://git.launchpad.net/~ubuntu-kernel/ubuntu/+… | patch |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Canonical | Ubuntu Linux |
Affected:
6.8.0 , < 6.8.0-124.124
(dpkg)
Affected: 6.17.0 , < 6.17.0-35.35 (dpkg) Affected: 7.0.0 , < 7.0.0-22.22 (dpkg) |
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"status": "affected",
"version": "6.8.0",
"versionType": "dpkg"
},
{
"lessThan": "6.17.0-35.35",
"status": "affected",
"version": "6.17.0",
"versionType": "dpkg"
},
{
"lessThan": "7.0.0-22.22",
"status": "affected",
"version": "7.0.0",
"versionType": "dpkg"
}
]
}
],
"credits": [
{
"lang": "en",
"type": "finder",
"value": "Tristan Madani (@TristanInSec), Talence Security"
}
],
"descriptions": [
{
"lang": "en",
"value": "Ubuntu Linux 6.8, 6.17 and 7.0 contain SAUCE patches with a possible NULL pointer dereference in the handling of AppArmor notifications. The bug can be triggered by an unprivileged local user. This can lead to a kernel oops."
}
],
"metrics": [
{
"cvssV3_1": {
"attackComplexity": "LOW",
"attackVector": "LOCAL",
"availabilityImpact": "LOW",
"baseScore": 3.3,
"baseSeverity": "LOW",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"privilegesRequired": "LOW",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L",
"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": "2026-05-28T18:27:20.987Z",
"orgId": "cc1ad9ee-3454-478d-9317-d3e869d708bc",
"shortName": "canonical"
},
"references": [
{
"tags": [
"patch"
],
"url": "https://git.launchpad.net/~ubuntu-kernel/ubuntu/+source/linux/+git/noble/commit/?id=7f3c4902c39432ce7ea0d384cb70eba282247fac"
}
],
"source": {
"discovery": "EXTERNAL"
},
"title": "NULL pointer dereference in Ubuntu Linux AppArmor notification handling"
}
},
"cveMetadata": {
"assignerOrgId": "cc1ad9ee-3454-478d-9317-d3e869d708bc",
"assignerShortName": "canonical",
"cveId": "CVE-2026-47327",
"datePublished": "2026-05-28T18:27:20.987Z",
"dateReserved": "2026-05-19T10:37:36.433Z",
"dateUpdated": "2026-05-28T19:25:26.930Z",
"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.