Weakness (CWE)
CWE-476: NULL Pointer Dereference
The product dereferences a pointer that it expects to be valid but is NULL.
How to prevent it (5 mitigations)
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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].
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Requirements
Select a programming language that is not susceptible to these issues.
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Implementation
Check the results of all functions that return a value and verify that the value is non-null before acting upon it.
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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.
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Implementation
Explicitly initialize all variables and other data stores, either during declaration or just before the first usage.
Source: MITRE CWE-476
22 results · Clear filters · Feed
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Medium 5.3CVE-2026-90782 Public exploit
S2OPC through 1.7.3 NULL Pointer Dereference in alloc_notification_message_items()
S2OPC through 1.7.3 contains a null pointer dereference in msg_subscription_publish_bs__alloc_notification_message_items() where a failed allocation for DataChangeNotification is overwritten by a successful allocation for EventNotificationList. Attackers can …
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Medium 6.2CVE-2026-86547 Public exploit
mrubyc through 4.0.0 NULL Pointer Dereference via OP_ENTER
mrubyc through 4.0.0 contains a null pointer dereference vulnerability in the op_enter() handler in src/vm.c when processing untrusted bytecode. Attackers can craft malicious .mrb bytecode files with OP_ENTER instructions at the top level to crash the embeddi…
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Medium 6.5CVE-2026-66749 Public exploit
Let's Chat 0.4.0 - 0.4.8 Denial of Service via Null Dereference in Room Lookup
Let's Chat 0.4.0 through 0.4.8 contains a null dereference vulnerability that allows authenticated attackers to crash the server by supplying a valid 24-character hex string room parameter that matches no document in the database. Attackers can send a crafted…
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Medium 4.3CVE-2026-45729 Public exploit
ThorVG: Null pointer dereference in SVG loader causes crash via 6-byte malformed input
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. …
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Medium 5.9CVE-2026-6666 Public exploit
PgBouncer crash in kill_pool_logins_server_error
A possible null pointer reference in PgBouncer before 1.25.2 could lead to a crash, if a server sends an error response without SQLSTATE field.
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Medium 6.1CVE-2026-22722 Public exploit
VMware Workstation for Windows null pointer dereference may allow an authenticated user to trigger a crash
A malicious actor with authenticated user privileges on a Windows based Workstation host may be able to cause a null pointer dereference error. To Remediate CVE-2026-22722, apply the patches listed in the "Fixed version" column of the 'Response Matrix'
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Medium 6.1CVE-2025-11187 Public exploit
Improper validation of PBMAC1 parameters in PKCS#12 MAC verification
Issue summary: PBMAC1 parameters in PKCS#12 files are missing validation which can trigger a stack-based buffer overflow, invalid pointer or NULL pointer dereference during MAC verification. Impact summary: The stack buffer overflow or NULL pointer dereferenc…
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Medium 5.5CVE-2025-9548 Public exploit
A potential null pointer dereference vulnerability was reported in the Lenovo Power Management Driver that could allow …
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Medium 4.3CVE-2025-4476 Public exploit
Libsoup: null pointer dereference in libsoup may lead to denial of service
A denial-of-service vulnerability has been identified in the libsoup HTTP client library. This flaw can be triggered when a libsoup client receives a 401 (Unauthorized) HTTP response containing a specifically crafted domain parameter within the WWW-Authentica…
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Medium 5.5CVE-2024-12227 Public exploit
MSI Dragon Center IOCTL NTIOLib_X64.sys MmUnMapIoSpace null pointer dereference
A vulnerability, which was classified as problematic, was found in MSI Dragon Center up to 2.0.146.0. This affects the function MmUnMapIoSpace in the library NTIOLib_X64.sys of the component IOCTL Handler. The manipulation leads to null pointer dereference. I…
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Medium 5.5CVE-2024-36424 Public exploit
K7RKScan.sys in K7 Ultimate Security before 17.0.2019 allows local users to cause a denial of service (BSOD) because of…
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Medium 5.5CVE-2024-26475 Public exploit
An issue in radareorg radare2 v.0.9.7 through v.5.8.6 and fixed in v.5.8.8 allows a local attacker to cause a denial of…
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Medium 5.3CVE-2023-4683 Public exploit
NULL Pointer Dereference in gpac/gpac
NULL Pointer Dereference in GitHub repository gpac/gpac prior to 2.3-DEV.
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Medium 6.5CVE-2023-3338 Public exploit
Crash due to a null pointer dereference in the dn_nsp_send function
A null pointer dereference flaw was found in the Linux kernel's DECnet networking protocol. This issue could allow a remote user to crash the system.
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Medium 5.5CVE-2022-34683 Public exploit
NVIDIA GPU Display Driver for Windows contains a vulnerability in the kernel mode layer (nvlddmkm.sys) handler for Dxgk…
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Medium 5.8CVE-2021-4043 Public exploit
NULL Pointer Dereference in gpac/gpac
NULL Pointer Dereference in GitHub repository gpac/gpac prior to 1.1.0.
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Medium 5.9
NULL pointer deref in signature_algorithms processing
An OpenSSL TLS server may crash if sent a maliciously crafted renegotiation ClientHello message from a client. If a TLSv1.2 renegotiation ClientHello omits the signature_algorithms extension (where it was present in the initial ClientHello), but includes a si…
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Medium 5.9CVE-2021-23841 Public exploit
Null pointer deref in X509_issuer_and_serial_hash()
The OpenSSL public API function X509_issuer_and_serial_hash() attempts to create a unique hash value based on the issuer and serial number data contained within an X509 certificate. However it fails to correctly handle any errors that may occur while parsing …
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Medium 5.9CVE-2020-1971 Public exploit
EDIPARTYNAME NULL pointer dereference
The X.509 GeneralName type is a generic type for representing different types of names. One of those name types is known as EDIPartyName. OpenSSL provides a function GENERAL_NAME_cmp which compares different instances of a GENERAL_NAME to see if they are equa…
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Medium 5.3CVE-2020-26235 Public exploit
Segmentation fault in Rust time crate
In Rust time crate from version 0.2.7 and before version 0.2.23, unix-like operating systems may segfault due to dereferencing a dangling pointer in specific circumstances. This requires the user to set any environment variable in a different thread than the …
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Medium 4.7CVE-2019-10207 Public exploit
A flaw was found in the Linux kernel's Bluetooth implementation of UART, all versions kernel 3.x.x before 4.18.0 and ke…
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Medium 5.9
An exploitable denial-of-service vulnerability exists in the X509 certificate parser of Python.org Python 2.7.11 / 3.6.…