Common Weakness Enumeration

CWE-476

Allowed

NULL Pointer Dereference

Abstraction: Base · Status: Stable

The product dereferences a pointer that it expects to be valid but is NULL.

6549 vulnerabilities reference this CWE, most recent first.

CVE-2026-47276 (GCVE-0-2026-47276)

Vulnerability from cvelistv5 – Published: 2026-07-20 16:44 – Updated: 2026-07-20 17:41
VLAI
Title
NULL Pointer Dereference in REST API properties_parse via Malformed user_properties
Summary
In nanomq versions 0.24.11 and earlier, a NULL pointer dereference in `properties_parse()` allows an authenticated attacker to crash the NanoMQ broker by sending a POST request to `/api/v4/mqtt/publish` with `user_properties` as a JSON array instead of a JSON object. The crash occurs because `strlen()` is called on a NULL `item->string` pointer when iterating over array elements. An authenticated attacker can exploit this to crash the NanoMQ broker process. This is patched in version 0.24.14.
SSVC
Exploitation: poc Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-07-20 17:40 UTC
CWE
  • CWE-476 - NULL Pointer Dereference
References
Impacted products
Vendor Product Version
nanomq nanomq Affected: <= 0.24.11
Create a notification for this product.
Show details on NVD website

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CVE-2026-47275 (GCVE-0-2026-47275)

Vulnerability from cvelistv5 – Published: 2026-07-20 16:43 – Updated: 2026-07-20 18:56
VLAI
Title
nanomq NULL Pointer Dereference in MQTTv5 Client CONNECT Decoder Leading to Remote DoS
Summary
In nanomq versions 0.24.11 and earlier, a NULL pointer dereference in `nni_mqttv5_msg_decode_connect()` allows a malicious MQTT broker to crash any connecting NanoMQ MQTTv5 client (including bridge mode) with a single packet, causing remote denial of service via SIGSEGV. In `nni_mqttv5_msg_decode_connect()` (`mqtt_codec.c:1863`), the code iterates over CONNECT properties using variable `prop` when it should use `will_prop`. When a CONNECT packet has no connect-level properties (`prop == NULL`) but has will properties (`will_prop != NULL`), dereferencing `prop->next` causes SIGSEGV at address `0x38` (NULL + `offsetof(property, next)`). This affects both `nanomq_cli` and **NanoMQ bridge mode** (Core component), as both use the same `mqtt_client.c` receive path. This can lead to remote DoS if a malicious MQTT broker can crash the client process with a single 35-byte packet and persistent DoS if auto-reconnect causes infinite crash loop.
SSVC
Exploitation: poc Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-07-20 18:56 UTC
CWE
  • CWE-476 - NULL Pointer Dereference
References
Impacted products
Vendor Product Version
nanomq nanomq Affected: <= 0.24.11
Create a notification for this product.
Show details on NVD website

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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.
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-05-28 13:38 UTC
CWE
  • CWE-476 - NULL Pointer Dereference
References
Impacted products
Vendor Product Version
mcdope pam_usb Affected: < 0.9.0
Create a notification for this product.
Show details on NVD website

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CVE-2026-47221 (GCVE-0-2026-47221)

Vulnerability from cvelistv5 – Published: 2026-06-26 17:35 – Updated: 2026-06-26 18:33
VLAI
Title
Envoy: Null pointer deref in internal redirects
Summary
Envoy is an open source edge and service proxy designed for cloud-native applications. From 1.18.0 until 1.35.13, 1.36.9, 1.37.5, and 1.38.3, the router filter contains a null pointer dereference vulnerability when handling HTTP 303 (See Other) internal redirects for body-less non-GET/HEAD requests. When a POST, PUT, DELETE, or PATCH request without a body is sent to a route configured with internal redirect policy that includes 303 in redirect_response_codes, and the upstream responds with HTTP 303, the redirect handling code attempts to drain a request body buffer that was never allocated. This results in a segmentation fault that crashes the entire Envoy process. When route configured with internal_redirect_policy including 303 in redirect_response_codes and upstream must return HTTP 303 response, an unauthenticated attacker can exploit this to cause complete denial of service, terminating all active connections. This vulnerability is fixed in 1.35.13, 1.36.9, 1.37.5, and 1.38.3.
SSVC
Exploitation: poc Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-06-26 18:33 UTC
CWE
  • CWE-476 - NULL Pointer Dereference
References
Impacted products
Vendor Product Version
envoyproxy envoy Affected: >= 1.38.0, < 1.38.3
Affected: >= 1.37.0, < 1.37.5
Affected: >= 1.36.0, < 1.36.9
Affected: >= 1.18.0, < 1.35.13
Create a notification for this product.
Show details on NVD website

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CVE-2026-47220 (GCVE-0-2026-47220)

Vulnerability from cvelistv5 – Published: 2026-06-26 18:02 – Updated: 2026-07-15 00:49
VLAI
Title
Envoy: Segmentation fault when using %REQUESTED_SERVER_NAME% in log format
Summary
Envoy is an open source edge and service proxy designed for cloud-native applications. From 1.37.0 until 1.37.5 and 1.38.3, when the %REQUESTED_SERVER_NAME(X:Y)% is used in log format and host related options is specified, like HOST_FIRST, SNI_FIRST, it's possible to crash Envoy when the specified host header is missing in the request headers. This vulnerability is fixed in 1.37.5 and 1.38.3.
SSVC
Exploitation: poc Automatable: yes Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-06-29 13:26 UTC
CWE
  • CWE-476 - NULL Pointer Dereference
Impacted products
Vendor Product Version
envoyproxy envoy Affected: >= 1.38.0, < 1.38.3
Affected: >= 1.37.0, < 1.37.5
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Red Hat OpenShift Service Mesh 2     cpe:/a:redhat:service_mesh:2
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Red Hat OpenShift Service Mesh 3     cpe:/a:redhat:service_mesh:3
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Show details on NVD website

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CVE-2026-47204 (GCVE-0-2026-47204)

Vulnerability from cvelistv5 – Published: 2026-06-26 17:37 – Updated: 2026-06-29 13:27
VLAI
Title
Envoy: grpc_stats filter segfault on Connect protocol requests to direct_response routes
Summary
Envoy is an open source edge and service proxy designed for cloud-native applications. From 1.26.0 until 1.35.13, 1.36.9, 1.37.5, and 1.38.3, the envoy.filters.http.grpc_stats filter crashes (null pointer dereference / segfault) when a Connect protocol request (Content-Type: application/connect+proto or application/connect+json) hits a direct_response route. A single unauthenticated HTTP request crashes the Envoy process. This vulnerability is fixed in 1.35.13, 1.36.9, 1.37.5, and 1.38.3.
SSVC
Exploitation: poc Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-06-29 13:26 UTC
CWE
  • CWE-476 - NULL Pointer Dereference
References
Impacted products
Vendor Product Version
envoyproxy envoy Affected: >= 1.38.0, < 1.38.3
Affected: >= 1.37.0, < 1.37.5
Affected: >= 1.36.0, < 1.36.9
Affected: >= 1.26.0, < 1.35.13
Create a notification for this product.
Show details on NVD website

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CVE-2026-47143 (GCVE-0-2026-47143)

Vulnerability from cvelistv5 – Published: 2026-07-21 20:10 – Updated: 2026-07-22 13:42
VLAI
Title
Capstone has a NULL Pointer Dereference with 3DNow! opcodes
Summary
Capstone is a disassembly framework. Versions prior to 6.0.0-Alpha8 and 5.0.8 have a NULL pointer dereference in `modRMRequired()` and `decode()` when disassembling 3DNow! opcodes (`0F 0F`) in builds compiled with `-DCAPSTONE_X86_REDUCE`, allowing a remote attacker to crash any application using the reduced X86 Capstone library by supplying a crafted input containing the 4-byte sequence `0F 0F <modrm> <imm8>`. Versions 6.0.0-Alpha8 and 5.0.8 patch the issue.
SSVC
Exploitation: poc Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-07-22 13:42 UTC
CWE
  • CWE-476 - NULL Pointer Dereference
Impacted products
Vendor Product Version
capstone-engine capstone Affected: < 5.0.8
Affected: < 6.0.0-Alpha8
Create a notification for this product.
Show details on NVD website

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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.
SSVC
Exploitation: poc Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-06-01 13:52 UTC
CWE
  • CWE-476 - NULL Pointer Dereference
References
Impacted products
Vendor Product Version
yhirose cpp-httplib Affected: < 0.44.0
Create a notification for this product.
Show details on NVD website

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CVE-2026-46334 (GCVE-0-2026-46334)

Vulnerability from cvelistv5 – Published: 2026-08-04 23:50 – Updated: 2026-08-05 14:28
VLAI
Title
OpenSIPS: Denial of Service in SDP bandwidth parsing via QoS SDP cloning
Summary
OpenSIPS is a Session Initiation Protocol (SIP) server implementation. Versions prior to 3.6.6 and 4.0.0-rc1 contain a denial of service vulnerability in the SDP bandwidth-line parsing logic. A SIP request with Content-Type: application/sdp and a malformed session-level SDP bandwidth line missing the required colon delimiter can corrupt parsed SDP bandwidth metadata. When a route or module subsequently clones the corrupted SDP state, as occurs with dialog and QoS processing, the OpenSIPS worker process crashes. An unauthenticated remote attacker can therefore trigger a crash in any configuration whose routing script parses attacker-controlled SDP and applies dialog/QoS processing. This issue has been fixed in versions 3.6.6 and 4.0.0-rc1.
SSVC
Exploitation: poc Automatable: yes Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-05 14:20 UTC
CWE
  • CWE-476 - NULL Pointer Dereference
  • CWE-20 - Improper Input Validation
Impacted products
Vendor Product Version
OpenSIPS opensips Affected: >= 3.4.0, < 3.6.6
Affected: >= 4.0.0-beta, < 4.0.0-rc1
Create a notification for this product.
Show details on NVD website

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CVE-2026-45816 (GCVE-0-2026-45816)

Vulnerability from cvelistv5 – Published: 2026-07-24 12:11 – Updated: 2026-07-24 18:22
VLAI
Title
Apache NimBLE: NULL pointer dereference vulnerability in SMP LTK request
Summary
NULL Pointer Dereference vulnerability in Apache NimBLE in LE Long Term Key Request event. This requires disabled asserts (otherwise assert would trigger before NULL dereference) and bogus (or misbehaving) controller, thus severity is low. This issue affects Apache NimBLE: through 1.9.0. Users are recommended to upgrade to version 1.10.0, which fixes the issue.
SSVC
Exploitation: none Automatable: yes Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-07-24 18:22 UTC
CWE
  • CWE-476 - NULL Pointer Dereference
Impacted products
Vendor Product Version
Apache Software Foundation Apache NimBLE Affected: 0 , ≤ 1.9.0 (semver)
Create a notification for this product.
Show details on NVD website

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Mitigation MIT-56
Implementation

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
Requirements

Select a programming language that is not susceptible to these issues.

Mitigation
Implementation

Check the results of all functions that return a value and verify that the value is non-null before acting upon it.

Mitigation
Architecture and Design

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
Implementation

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.