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
41 results · Clear filters · Feed
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High 7.5CVE-2026-63686 Public exploit
Apache HTTP Server: mod_xml2enc crash on charset conversion failure
A NULL pointer dereference in mod_xml2enc in Apache Software Foundation Apache HTTP Server before 2.4.69 on all platforms allows an untrusted backend server to cause a denial of service via a proxied response with a charset whose conversion partially succeeds…
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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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High 7.5CVE-2026-67184 Public exploit
TinyWeb 0.0.8 Null Pointer Dereference DoS via Malformed HTTP Request
TinyWeb through 0.0.8 contains a null pointer dereference vulnerability that allows unauthenticated remote attackers to crash worker processes by sending a malformed HTTP request line with an invalid version string. The HttpParser::execute() function fails to…
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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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High 7.5CVE-2026-25075 Public exploit
strongSwan 4.5.0 < 6.0.5 EAP-TTLS AVP Parsing Integer Underflow
strongSwan versions 4.5.0 prior to 6.0.5 contain an integer underflow vulnerability in the EAP-TTLS AVP parser that allows unauthenticated remote attackers to cause a denial of service by sending crafted AVP data with invalid length fields during IKEv2 authen…
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Low 2.1CVE-2026-29781 Public exploit
Sliver: Authenticated Nil-Pointer Dereference in Handlers
Sliver is a command and control framework that uses a custom Wireguard netstack. In versions from 1.7.3 and prior, a vulnerability exists in the Sliver C2 server's Protobuf unmarshalling logic due to a systemic lack of nil-pointer validation. By extracting va…
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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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High 7.5CVE-2025-69421 Public exploit
NULL Pointer Dereference in PKCS12_item_decrypt_d2i_ex function
Issue summary: Processing a malformed PKCS#12 file can trigger a NULL pointer dereference in the PKCS12_item_decrypt_d2i_ex() function. Impact summary: A NULL pointer dereference can trigger a crash which leads to Denial of Service for an application processi…
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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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Low 1.9CVE-2025-13425 Public exploit
Denial of Service in OSV-SCALIBR
A bug in the filesystem traversal fallback path causes fs/diriterate/diriterate.go:Next() to overindex an empty slice when ReadDir returns nil for an empty directory, resulting in a panic (index out of range) and an application crash (denial of service) in OS…
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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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High 7.5CVE-2025-55780 Public exploit
A null pointer dereference occurs in the function break_word_for_overflow_wrap() in MuPDF 1.26.4 when rendering a malfo…
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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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High 7.8CVE-2024-55511 Public exploit
A null pointer dereference vulnerability in Macrium Reflect prior to 8.1.8017 allows a local attacker to cause a system…
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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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High 7.5CVE-2024-23722 Public exploit
In Fluent Bit 2.1.8 through 2.2.1, a NULL pointer dereference can be caused via an invalid HTTP payload with the conten…
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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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High 7.5CVE-2023-40459 Public exploit
Improper input leads to DoS
The ACEManager component of ALEOS 4.16 and earlier does not adequately perform input sanitization during authentication, which could potentially result in a Denial of Service (DoS) condition for ACEManager without impairing other router functions. ACEManager …
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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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Unscored —CVE-2023-37456 Public exploit
The session restore helper crashed whenever there was no parameter sent to the message handler. This vulnerability affe…
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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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High 7.5CVE-2022-3358 Public exploit
Using a Custom Cipher with NID_undef may lead to NULL encryption
OpenSSL supports creating a custom cipher via the legacy EVP_CIPHER_meth_new() function and associated function calls. This function was deprecated in OpenSSL 3.0 and application authors are instead encouraged to use the new provider mechanism in order to imp…
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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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High 7.5
Segmentation fault in SSL_check_chain
Server or client applications that call the SSL_check_chain() function during or after a TLS 1.3 handshake may crash due to a NULL pointer dereference as a result of incorrect handling of the "signature_algorithms_cert" TLS extension. The crash occurs if an i…
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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.…
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High 7.5
An issue has been found in the parsing of authoritative answers in PowerDNS Recursor before 4.0.8, leading to a NULL po…
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High 7.5
sshd in OpenSSH before 7.4 allows remote attackers to cause a denial of service (NULL pointer dereference and daemon cr…
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High 7.5CVE-2016-6317 Public exploit
ActiveRecord in Ruby on Rails allows database-query bypass
Action Record in Ruby on Rails 4.2.x before 4.2.7.1 does not properly consider differences in parameter handling between the Active Record component and the JSON implementation, which allows remote attackers to bypass intended database-query restrictions and …
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High 7.1CVE-2011-1985 Public exploit
win32k.sys in the kernel-mode drivers in Microsoft Windows XP SP2 and SP3, Windows Server 2003 SP2, Windows Vista SP2, …
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High 7.7
The JIT compiler in Microsoft .NET Framework 3.5 Gold and SP1, 3.5.1, and 4.0, when IsJITOptimizerDisabled is false, do…