Common Weakness Enumeration

CWE-476

Allowed

NULL Pointer Dereference

Abstraction: Base · Status: Stable

API response cwe.mitre.org

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

6298 vulnerabilities reference this CWE, most recent first.

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.
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
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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.
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
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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
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-2026-45541 (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
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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
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-2026-45104 (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)
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-129 - Improper Validation of Array Index
  • CWE-476 - NULL Pointer Dereference
Assigner
References
Impacted products
Vendor Product Version
MapServer MapServer Affected: >= 6.4.0, < 8.6.3
Create a notification for this product.
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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)
CVSS:3.1/AV:P/AC:L/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: < 0.8.7
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CVE-2026-44638 (GCVE-0-2026-44638)

Vulnerability from cvelistv5 – Published: 2026-05-14 19:59 – Updated: 2026-05-15 14:18
VLAI
Title
libsixel: NULL pointer dereference
Summary
libsixel is a SIXEL encoder/decoder implementation derived from kmiya's sixel. From to 1.8.7-r1, a wrong NULL check after an allocation call in sixel_decode_raw and sixel_decode causes a NULL pointer dereference whenever the allocation fails. The check tests the address of the output parameter (always non-NULL) instead of the value the malloc returned. On allocation failure, the function continues and writes through a NULL pointer, crashing the process. This is a denial of service against any caller of these public APIs that hits a low-memory condition. This vulnerability is fixed in 1.8.7-r2.
Severity
2.5 (Low)
CVSS:3.1/AV:L/AC:H/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
  • CWE-690 - Unchecked Return Value to NULL Pointer Dereference
Assigner
References
Impacted products
Vendor Product Version
saitoha libsixel Affected: >= 1.0.0, < 1.8.7-r2
Create a notification for this product.
Show details on NVD website
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CVE-2026-44602 (GCVE-0-2026-44602)

Vulnerability from cvelistv5 – Published: 2026-05-07 03:17 – Updated: 2026-05-07 14:58
VLAI
Summary
Tor before 0.4.9.7 has a NULL pointer dereference when a CERT cell is received out of order, aka TROVE-2026-006.
Severity
3.7 (Low)
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L
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
torproject Tor Affected: 0 , < 0.4.9.7 (custom)
Create a notification for this product.
Show details on NVD website
To clipboard 

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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.

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