Common Weakness Enumeration
CWE-476
AllowedNULL Pointer Dereference
Abstraction: Base · Status: Stable
The product dereferences a pointer that it expects to be valid but is NULL.
6379 vulnerabilities reference this CWE, most recent first.
CVE-2026-67304 (GCVE-0-2026-67304)
Vulnerability from cvelistv5 – Published: 2026-08-01 12:22 – Updated: 2026-08-03 18:11
VLAI
EPSS
VEX
Title
FreeRDP before 3.29.0 NULL Dereference via smartcard cleanup
Summary
FreeRDP before 3.29.0 contains a null pointer dereference vulnerability in smartcard device control request cleanup when reader-state decoding fails. Attackers can send malformed smartcard IRP requests with non-zero cReaders and truncated reader-state data to crash the process via null pointer access in free_reader_states functions.
Severity
SSVC
Exploitation: poc
Automatable: yes
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-476 - NULL Pointer Dereference
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://github.com/FreeRDP/FreeRDP/security/advis… | vendor-advisory |
| https://github.com/FreeRDP/FreeRDP/commit/1cc783d… | patch |
| https://www.vulncheck.com/advisories/freerdp-befo… | third-party-advisory |
Impacted products
Date Public
2026-07-15 00:00
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CVE-2026-67288 (GCVE-0-2026-67288)
Vulnerability from cvelistv5 – Published: 2026-08-01 12:22 – Updated: 2026-08-03 19:49
VLAI
EPSS
VEX
Title
FreeRDP before 3.29.0 Denial of Service via smartcard cache
Summary
FreeRDP before 3.29.0 contains a null pointer dereference vulnerability in smartcard cache request decoders that accept NULL NDR pointers for LookupName in SCARD_IOCTL_READCACHEA and SCARD_IOCTL_WRITECACHEA operations. When smartcard emulation is enabled, attackers can send crafted smartcard cache requests with NULL lookup-name pointers to trigger strlen() on a null pointer, causing client process termination.
Severity
SSVC
Exploitation: poc
Automatable: yes
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-476 - NULL Pointer Dereference
Assigner
References
5 references
| URL | Tags |
|---|---|
| https://github.com/FreeRDP/FreeRDP/security/advis… | vendor-advisory |
| https://github.com/FreeRDP/FreeRDP/commit/f3b4347… | patch |
| https://github.com/FreeRDP/FreeRDP/commit/5370fb2… | patch |
| https://www.vulncheck.com/advisories/freerdp-befo… | third-party-advisory |
| https://github.com/FreeRDP/FreeRDP/security/advis… | exploit |
Impacted products
Date Public
2026-07-15 00:00
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CVE-2026-67184 (GCVE-0-2026-67184)
Vulnerability from cvelistv5 – Published: 2026-07-28 16:28 – Updated: 2026-07-28 17:38 X_Open Source
VLAI
EPSS
VEX
Title
TinyWeb 0.0.8 Null Pointer Dereference DoS via Malformed HTTP Request
Summary
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 allocate the Url object when version parsing fails, leaving the url pointer NULL, and buildResponse() subsequently dereferences this NULL pointer without checking the valid_requ flag, producing a SIGSEGV that terminates the worker process and, when repeated across all workers, takes the server permanently offline until manually restarted.
Severity
SSVC
Exploitation: poc
Automatable: yes
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-476 - NULL Pointer Dereference
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://github.com/theopaid/Unauthenticated-NULL-… | technical-descriptionexploit |
| https://www.vulncheck.com/advisories/tinyweb-null… | third-party-advisory |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| GeneralSandman | TinyWeb |
Affected:
e48f15d38d2bebeec9cabcfdde81931b10a1963b , ≤ a381da252fe8e873c8aff22703040426cc9b2ae0
(git)
Affected: 0.0.8 (semver) |
Date Public
2026-07-26 00:00
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CVE-2026-66749 (GCVE-0-2026-66749)
Vulnerability from cvelistv5 – Published: 2026-07-28 15:30 – Updated: 2026-07-28 16:43 X_Open Source Unsupported When Assigned
VLAI
EPSS
VEX
Title
Let's Chat 0.4.0 - 0.4.8 Denial of Service via Null Dereference in Room Lookup
Summary
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 GET /messages request causing an uncaught TypeError in an asynchronous Mongoose callback that terminates the Node.js server process, with the same defect reachable through multiple code paths including the socket.io interface.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-476 - NULL Pointer Dereference
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://github.com/theopaid/Unchecked-Room-Lookup… | technical-descriptionexploit |
| https://www.vulncheck.com/advisories/let-s-chat-d… | third-party-advisory |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| sdelements | lets-chat |
Affected:
0.4.0 , ≤ 0.4.8
(semver)
Affected: 84981a6d2534445c00ea4e095c934e46943c0b1d , ≤ 617207ff3c0c0bf8e3c7a915bd9ec03f1dd8390c (git) |
Date Public
2026-07-26 00:00
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CVE-2026-63762 (GCVE-0-2026-63762)
Vulnerability from cvelistv5 – Published: 2026-07-20 12:04 – Updated: 2026-07-28 01:05
VLAI
EPSS
VEX
Title
SurrealDB before v2.6.1 Denial of Service via scripting
Summary
SurrealDB before v2.6.1 (and before v3.0.0-beta.3) contains a denial of service vulnerability in its embedded JavaScript scripting engine, which is enabled via the --allow-scripting capability (disabled by default). Any user able to execute arbitrary queries — including unauthenticated guests when --allow-guests is enabled — can use built-in string functions to construct a large string and pass it to the JavaScript runtime for compilation, triggering a null pointer dereference in the underlying QuickJS-NG engine. This causes the server process to terminate immediately without graceful shutdown, requiring a manual restart. The issue was fixed by updating the rquickjs dependency from v0.9.0 to v0.11.0.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-476 - NULL Pointer Dereference
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://github.com/surrealdb/surrealdb/security/a… | vendor-advisory |
| https://www.vulncheck.com/advisories/surrealdb-be… | third-party-advisory |
Impacted products
Date Public
2026-02-12 00:00
Credits
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CVE-2026-62309 (GCVE-0-2026-62309)
Vulnerability from cvelistv5 – Published: 2026-07-16 19:42 – Updated: 2026-07-18 03:14
VLAI
EPSS
VEX
Title
CoreDNS: proxyproto plugin panics on PPv2 datagram with non-UDP transport — single 28-byte packet remote DoS
Summary
CoreDNS is a DNS server written in Go. Prior to 1.14.4, a single 28-byte UDP datagram can crash the CoreDNS process when the proxyproto plugin is enabled because plugin/pkg/proxyproto/proxyproto.go PacketConn.ReadFrom handles a PROXY v2 header with non-UDP transport such as family byte 0x11, reassigns addr from a nil readFrom result after parseProxyProtocol errors, and calls addr.String() in the warning log before ServeDNS recovery applies. This issue is fixed in version 1.14.4.
Severity
7.5 (High)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-476 - NULL Pointer Dereference
Assigner
References
4 references
| URL | Tags |
|---|---|
| https://github.com/coredns/coredns/security/advis… | x_refsource_CONFIRM |
| https://github.com/coredns/coredns/pull/8154 | x_refsource_MISC |
| https://github.com/coredns/coredns/commit/60a439d… | x_refsource_MISC |
| https://github.com/coredns/coredns/releases/tag/v1.14.4 | x_refsource_MISC |
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CVE-2026-62299 (GCVE-0-2026-62299)
Vulnerability from cvelistv5 – Published: 2026-07-16 19:44 – Updated: 2026-07-17 18:06
VLAI
EPSS
VEX
Title
CoreDNS: rewrite-plugin EDNS0 response-revert nil-pointer panic (remote DoS) when a downstream plugin returns a response with no OPT record
Summary
CoreDNS is a DNS server written in Go. Prior to 1.14.5, the CoreDNS rewrite plugin supports edns0 rewrite rules with an optional revert flag, and two response rules, edns0SetResponseRule and edns0ReplaceResponseRule[T] in plugin/rewrite/edns0.go, call res.IsEdns0() and immediately dereference the returned *dns.OPT without a nil check when a downstream plugin returns a response with no OPT record. A remote, unauthenticated client can send a single ordinary DNS query matching a rewrite edns0 <local|nsid|subnet> <set|append|replace> ... revert rule, causing ResponseReverter in plugin/rewrite/reverter.go to panic, return SERVFAIL, and degrade availability, or crash the CoreDNS process if the debug directive disables recovery. This issue is fixed in version 1.14.5.
Severity
5.3 (Medium)
SSVC
Exploitation: poc
Automatable: yes
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-476 - NULL Pointer Dereference
Assigner
References
4 references
| URL | Tags |
|---|---|
| https://github.com/coredns/coredns/security/advis… | x_refsource_CONFIRM |
| https://github.com/coredns/coredns/pull/8190 | x_refsource_MISC |
| https://github.com/coredns/coredns/commit/fc447d0… | x_refsource_MISC |
| https://github.com/coredns/coredns/releases/tag/v1.14.5 | x_refsource_MISC |
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CVE-2026-60109 (GCVE-0-2026-60109)
Vulnerability from cvelistv5 – Published: 2026-07-09 14:19 – Updated: 2026-07-14 22:03 X_Open Source
VLAI
EPSS
VEX
Title
Zeek < 8.0.9 Null Pointer Dereference DoS via Kerberos KRB_ERROR Parsing
Summary
Zeek before 8.0.9 contains a null pointer dereference vulnerability in its Kerberos protocol analyzer that allows unauthenticated remote attackers to crash the sensor by sending a crafted KRB_ERROR message with error-code 25 (KDC_ERR_PREAUTH_REQUIRED) containing a PA-DATA element with padata-type 2, 3, 11, or 19. Attackers can exploit a parser and analyzer state mismatch where proc_padata() dereferences an uninitialized pa_data_element field selected by the wrong parsing arm, triggering a crash via a single UDP or TCP packet to port 88 without any credentials or prior authentication.
Severity
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-476 - NULL Pointer Dereference
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://github.com/zeek/zeek/releases/tag/v8.0.9 | release-notes |
| https://github.com/zeek/zeek/commit/c82e3c734893d… | patch |
| https://www.vulncheck.com/advisories/zeek-null-po… | third-party-advisory |
Date Public
2026-07-06 00:00
Credits
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CVE-2026-58369 (GCVE-0-2026-58369)
Vulnerability from cvelistv5 – Published: 2026-06-30 15:56 – Updated: 2026-07-14 21:35 X_Open Source
VLAI
EPSS
VEX
Title
Woodpecker < 3.15.0 - Unauthenticated NULL Pointer Dereference in /api/orgs/lookup Enables Log-Flooding Denial of Service
Summary
Woodpecker before 3.15.0 registers the /api/orgs/lookup/*org_full_name endpoint without authentication middleware, and the LookupOrg handler unconditionally dereferences the session user (user.ForgeID, via ForgeFromUser) when selecting the forge to query. For an unauthenticated request session.User returns nil, so any unauthenticated HTTP request triggers a NULL pointer dereference in the handler. The panic is recovered by gin recovery middleware and the server continues serving (returning HTTP 500), but each request writes a multi-line panic stack trace to the error log. A low-bandwidth unauthenticated attacker can repeatedly probe the endpoint to flood the logs (about 37 lines per request), inflating disk usage and downstream log-ingestion cost and burying legitimate log events.
Severity
5.3 (Medium)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-476 - NULL Pointer Dereference
Assigner
References
4 references
| URL | Tags |
|---|---|
| https://github.com/woodpecker-ci/woodpecker/relea… | release-notes |
| https://github.com/woodpecker-ci/woodpecker/pull/6652 | issue-tracking |
| https://github.com/woodpecker-ci/woodpecker/commi… | patch |
| https://www.vulncheck.com/advisories/woodpecker-u… | third-party-advisory |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| woodpecker-ci | woodpecker |
Affected:
0 , < 3.15.0
(semver)
|
Date Public
2026-05-27 00:00
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CVE-2026-58250 (GCVE-0-2026-58250)
Vulnerability from cvelistv5 – Published: 2026-07-08 19:48 – Updated: 2026-07-09 13:33
VLAI
EPSS
VEX
Title
NATS Server: Pre-auth server crash via double INFO in leafnode handshake
Summary
NATS Server is a high-performance server for NATS.io, the cloud and edge native messaging system. Prior to 2.12.8 and 2.11.17, an unauthenticated peer with network access to a leafnode listener with compression enabled could crash the server during the pre-authentication leafnode handshake by sending repeated leafnode INFO protocol messages before authentication and account setup completed. This issue is fixed in versions 2.12.8 and 2.11.17.
Severity
7.5 (High)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-476 - NULL Pointer Dereference
Assigner
References
5 references
| URL | Tags |
|---|---|
| https://github.com/nats-io/nats-server/security/a… | x_refsource_CONFIRM |
| https://github.com/nats-io/nats-server/commit/8dc… | x_refsource_MISC |
| https://github.com/nats-io/nats-server/commit/fc5… | x_refsource_MISC |
| https://github.com/nats-io/nats-server/releases/t… | x_refsource_MISC |
| https://github.com/nats-io/nats-server/releases/t… | x_refsource_MISC |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| nats-io | nats-server |
Affected:
< 2.11.17
Affected: >= 2.12.0-preview.1, < 2.12.8 |
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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.