Common Weakness Enumeration

CWE-476

NULL Pointer Dereference

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

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
2.9 (Low)
CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P
SSVC
Exploitation: poc Automatable: no Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
  • CWE-476 - NULL Pointer Dereference
Assigner
References
Impacted products
Vendor Product Version
nanomq nanomq Affected: <= 0.24.8
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CVE-2026-45541 (GCVE-0-2026-45541)

Vulnerability from cvelistv5 – Published: 2026-06-10 00:25 – Updated: 2026-06-10 14:40
VLAI
Title
ESF-IDF: Remote Null Pointer Dereference in WebSocket Server
Summary
ESF-IDF is the Espressif Internet of Things (IOT) Development Framework. In versions 5.2.6, 5.3.5, 5.4.4, 5.5.4, and 6.0, a NULL-pointer dereference exists in the WebSocket subprotocol-negotiation path of the esp_http_server component. While parsing the client-supplied Sec-WebSocket-Protocol request header during the WebSocket handshake, the tokenisation result is dereferenced without a NULL check, so a malformed header value can crash the server before any application-level authentication runs. This issue has been patched in versions 5.2.7, 5.3.6, 5.4.5, 5.5.5, and 6.0.1.
Severity
7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
SSVC
Exploitation: none Automatable: yes Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
  • CWE-476 - NULL Pointer Dereference
Assigner
References
Impacted products
Vendor Product Version
espressif esp-idf Affected: = 6.0
Affected: = 5.5.4
Affected: = 5.4.4
Affected: = 5.3.5
Affected: = 5.2.6
Create a notification for this product.
Show details on NVD website
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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)
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L
SSVC
Exploitation: poc Automatable: no Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
  • CWE-476 - NULL Pointer Dereference
Assigner
References
Impacted products
Vendor Product Version
thorvg thorvg Affected: < 1.0.5
Create a notification for this product.
Show details on NVD website
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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)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
SSVC
Exploitation: none Automatable: yes Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
  • CWE-476 - NULL Pointer Dereference
Assigner
References
Impacted products
Vendor Product Version
FreeBSD FreeBSD Affected: 15.0-RELEASE , < p5 (release)
Create a notification for this product.
Date Public
2026-03-26 05:00
Credits
Nikolay Denev <ndenev@gmail.com>
Show details on NVD website
To clipboard 

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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
8.7 (High)
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
SSVC
Exploitation: poc Automatable: no Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
  • CWE-476 - NULL Pointer Dereference
Assigner
References
Impacted products
Vendor Product Version
yhirose cpp-httplib Affected: < 0.44.0
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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.
Severity
6.5 (Medium)
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
SSVC
Exploitation: poc Automatable: no Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
  • CWE-476 - NULL Pointer Dereference
Assigner
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
To clipboard 

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

Vulnerability from cvelistv5 – Published: 2026-06-26 18:02 – Updated: 2026-06-30 12:10
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.
Severity
7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
SSVC
Exploitation: poc Automatable: yes Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
  • CWE-476 - NULL Pointer Dereference
Assigner
References
Impacted products
Vendor Product Version
envoyproxy envoy Affected: >= 1.38.0, < 1.38.3
Affected: >= 1.37.0, < 1.37.5
Create a notification for this product.
Red Hat OpenShift Service Mesh 2     cpe:/a:redhat:service_mesh:2
 Create a notification for this product.
Red Hat OpenShift Service Mesh 3     cpe:/a:redhat:service_mesh:3
 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.
Severity
5.9 (Medium)
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
SSVC
Exploitation: poc Automatable: no Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
  • CWE-476 - NULL Pointer Dereference
Assigner
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
To clipboard 

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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)
CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
  • CWE-476 - NULL Pointer Dereference
Assigner
References
Impacted products
Vendor Product Version
mcdope pam_usb Affected: < 0.9.0
Create a notification for this product.
Show details on NVD website
To clipboard 

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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)
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
  • CWE-476 - NULL pointer dereference
Assigner
References
Impacted products
Vendor Product Version
Samsung Open Source Walrus Affected: f339b8ee4ea701772e8ae640b3d1b12ac02b1ae9
Create a notification for this product.
Credits
Sebastián Alba Vives
Show details on NVD website
To clipboard 

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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.

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