Common Weakness Enumeration

CWE-667

Weakness Allowed-with-Review

Improper Locking

Abstraction: Class · Status: Draft

The product does not properly acquire or release a lock on a resource, leading to unexpected resource state changes and behaviors.

Mapping guidance

This CWE entry is a Class and might have Base-level children that would be more appropriate

Examine children of this entry to see if there is a better fit

Relationships and members
ChildOf: CWE-662 · View CWE-1000
ChildOf: CWE-662 · View CWE-1003
ChildOf: CWE-662 · View CWE-1305
ChildOf: CWE-662 · View CWE-1340
Modes of introduction
Architecture and Design
Implementation
Detection methods

Automated Static Analysis

Automated static analysis, commonly referred to as Static Application Security Testing (SAST), can find some instances of this weakness by analyzing source code (or binary/compiled code) without having to execute it. Typically, this is done by building a model of data flow and control flow, then searching for potentially-vulnerable patterns that connect "sources" (origins of input) with "sinks" (destinations where the data interacts with external components, a lower layer such as the OS, etc.)

Effectiveness: High

Notes

Maintenance

Deeper research is necessary for synchronization and related mechanisms, including locks, mutexes, semaphores, and other mechanisms. Multiple entries are dependent on this research, which includes relationships to concurrency, race conditions, reentrant functions, etc. CWE-662 and its children - including CWE-667, CWE-820, CWE-821, and others - may need to be modified significantly, along with their relationships.

Content history
Submission: CWE Content Team · MITRE · 2008-04-11 · CWE Draft 9
Modification: Sean Eidemiller · Cigital · 2008-07-01 · CWE 1.0

added/updated demonstrative examples

Modification: Eric Dalci · Cigital · 2008-07-01 · CWE 1.0

updated Potential_Mitigations, Time_of_Introduction

Modification: CWE Content Team · MITRE · 2008-09-08 · CWE 1.0

updated Relationships

Modification: CWE Content Team · MITRE · 2008-11-24 · CWE 1.1

updated Relationships, Taxonomy_Mappings

Modification: CWE Content Team · MITRE · 2009-03-10 · CWE 1.3

updated Related_Attack_Patterns

Modification: CWE Content Team · MITRE · 2009-05-27 · CWE 1.4

updated Relationships

Modification: CWE Content Team · MITRE · 2009-07-27 · CWE 1.5

updated Common_Consequences

Modification: CWE Content Team · MITRE · 2010-09-27 · CWE 1.10

updated Relationships

Modification: CWE Content Team · MITRE · 2010-12-13 · CWE 1.11

updated Description, Name, Relationships

Modification: CWE Content Team · MITRE · 2011-06-01 · CWE 1.13

updated Common_Consequences, Relationships, Taxonomy_Mappings

Modification: CWE Content Team · MITRE · 2012-05-11 · CWE 2.2

updated Demonstrative_Examples, Observed_Examples, Relationships

Modification: CWE Content Team · MITRE · 2012-10-30 · CWE 2.3

updated Potential_Mitigations

Modification: CWE Content Team · MITRE · 2014-07-30 · CWE 2.8

updated Relationships, Taxonomy_Mappings

Modification: CWE Content Team · MITRE · 2017-05-03 · CWE 2.11

updated Related_Attack_Patterns

Modification: CWE Content Team · MITRE · 2017-11-08 · CWE 3.0

updated Taxonomy_Mappings

Modification: CWE Content Team · MITRE · 2019-01-03 · CWE 3.2

updated References, Relationships, Taxonomy_Mappings

Modification: CWE Content Team · MITRE · 2019-09-19 · CWE 3.4

updated Relationships

Modification: CWE Content Team · MITRE · 2019-09-23 · CWE 3.4.1

updated Description, Maintenance_Notes, Relationships

Modification: CWE Content Team · MITRE · 2020-02-24 · CWE 4.0

updated Relationships, Type

Modification: CWE Content Team · MITRE · 2020-08-20 · CWE 4.2

updated Relationships

Modification: CWE Content Team · MITRE · 2020-12-10 · CWE 4.3

updated Relationships

Modification: CWE Content Team · MITRE · 2021-03-15 · CWE 4.4

updated Demonstrative_Examples

Modification: CWE Content Team · MITRE · 2022-06-28 · CWE 4.8

updated Observed_Examples

Modification: CWE Content Team · MITRE · 2023-01-31 · CWE 4.10

updated Description

Modification: CWE Content Team · MITRE · 2023-04-27 · CWE 4.11

updated Detection_Factors, Relationships

Modification: CWE Content Team · MITRE · 2023-06-29 · CWE 4.12

updated Mapping_Notes

Modification: CWE Content Team · MITRE · 2025-04-03 · CWE 4.17

updated Demonstrative_Examples

Modification: CWE Content Team · MITRE · 2025-12-11 · CWE 4.19

updated Applicable_Platforms, Weakness_Ordinalities

Modification: CWE Content Team · MITRE · 2026-10-28 · CWE 5.0

updated Background_Details, Common_Consequences, Description, References

767 vulnerabilities reference this CWE, most recent first.

CVE-2026-118593 (GCVE-0-2026-118593)

Vulnerability from cvelistv5 – Published: 2026-10-30 06:41 – Updated: 2026-11-05 16:25
VLAI
Title
Kernel: local_bh imbalance in seg6_input_core() drop path (incomplete fix for cve-2026-46099)
Summary
A flaw was found in Red Hat Enterprise Linux 9 kernel builds. An incomplete backport of the CVE-2026-46099 fix in RHEL 9.6 through 9.10 left a local_bh imbalance in seg6_input_core(), where the drop path returns with bottom halves still disabled. This can lead to softirq starvation and denial of service on systems with SRv6 tunnels configured. Upstream and RHEL 10 are not affected.
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-30 19:37 UTC
CWE
Assigner
redhat CNA under the redhat root
CNA scorecard B 82/100 over 1129 records in the last 180 days details
References
URL Tags
https://access.redhat.com/security/cve/CVE-2026-118593 vdb-entryx_refsource_REDHAT
https://bugzilla.redhat.com/show_bug.cgi?id=2563095 issue-trackingx_refsource_REDHAT
Date Public
2026-10-23 19:44
Show details on NVD website

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CVE-2026-118052 (GCVE-0-2026-118052)

Vulnerability from cvelistv5 – Published: 2026-11-02 14:57 – Updated: 2026-11-02 16:19
VLAI
Title
Module Manager loaders leave the manager mutex held when a module preamble's sizes overflow, blocking every later module operation
Summary
In Eclipse ThreadX versions 6.0.1 through 6.5.2.202603, the Module Manager loaders return an overflow error without releasing the Module Manager mutex when a module preamble declares a data or stack size that overflows the allocation arithmetic. Loading such an image blocks every later module load, start, stop and unload from other threads until the system is reset.
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-11-02 16:19 UTC
CWE
Assigner
eclipse CNA under the mitre root
CNA scorecard C 66/100 over 204 records in the last 180 days details
Impacted products
Vendor Product Version
Eclipse Foundation Eclipse ThreadX Affected: 6.0.1 , ≤ 6.5.2.202603 (custom)
Create a notification for this product.
Show details on NVD website

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CVE-2026-112907 (GCVE-0-2026-112907)

Vulnerability from cvelistv5 – Published: 2026-11-05 21:50 – Updated: 2026-11-05 21:50
VLAI
Title
filelock: On Windows an oplock on a soft lock's marker holds SoftFileLock.acquire() past its timeout and blocks the stale break
Summary
filelock is a platform-independent file lock for Python. From 3.22.0 until 4.2.1, soft lock classes on Windows read an existing marker with _read_lock_file and remove a stale marker through break_lock_file using pathname operations that wait for an oplock break. Another local account with read access to an unheld marker can keep a Level 1 or batch oplock unanswered, causing SoftFileLock.acquire and related async or fallback locks to wait beyond timeout, blocking=False, and cancel_check. A stale marker under the oplock cannot be broken, but mutual exclusion remains intact and no file other than the marker is accessed. This issue is fixed in version 4.2.1.
CWE
Assigner
GitHub_M CNA under the mitre root
CNA scorecard C 72/100 over 8026 records in the last 180 days details
Impacted products
Vendor Product Version
tox-dev filelock Affected: >= 3.22.0, < 4.2.1
Create a notification for this product.
Show details on NVD website

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CVE-2026-111879 (GCVE-0-2026-111879)

Vulnerability from cvelistv5 – Published: 2026-10-20 21:24 – Updated: 2026-10-30 12:55
VLAI
Title
DBI versions before 1.656 for Perl hang on a later open of a DBD::DBM table because a failed open_data does not release the table's lock
Summary
DBI versions before 1.656 for Perl hang on a later open of a DBD::DBM table because a failed open_data does not release the table's lock. open_data creates the table's lock file and takes an exclusive flock on it for a CREATE, before the checks that can croak: a dbm_mldbm value that is not a module name, a failing tie, or a missing data file. The croak unwinds before the table object is blessed, so nothing releases the lock, and the meta data holding the open descriptor stays cached on the database handle. The dbm_mldbm and dbm_type values come from the DSN or the connect attributes, so a caller that chooses the serializer or the storage backend can trigger the failure. The flock has no timeout, so a later open of that table (even through a separate database handle) blocks for as long as the handle holding the stale lock lives, in the same process or any other.
SSVC
Exploitation: none Automatable: yes Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-30 12:55 UTC
CWE
Assigner
CPANSec CNA under the redhat root
CNA scorecard C 62/100 over 370 records in the last 180 days details
Impacted products
Vendor Product Version
Affected: 0 , < 1.656 (custom)
Show details on NVD website

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CVE-2026-110803 (GCVE-0-2026-110803)

Vulnerability from cvelistv5 – Published: 2026-10-21 18:22 – Updated: 2026-10-30 17:17
VLAI
Title
Session Lock Leak on an Invalid UI Id Allows Denial of Service in Vaadin Framework 8
Summary
VaadinService.requestEnd() in Vaadin Framework 8 locks the session and then reads the v-uiId request parameter outside the block that releases the lock. A request carrying a non-numeric v-uiId makes Integer.parseInt throw while the session lock is held, so the lock is never released and the container thread returns to its pool still owning it. Every later request to that session then blocks forever in VaadinService.lockSession(), and repeating the request exhausts the thread pool and takes the application down. No authentication is required: a session cookie, which any client obtains with a single request, is enough. Vaadin 10 and later are not affected, because Flow releases the lock in a finally block and does not read that parameter there, and Vaadin Framework 7 is not affected either. Users of affected versions should apply the following mitigation or upgrade. Releases that have fixed this issue include: Product version Vaadin Framework 8.16.0 - 8.32.1 Mitigation Upgrade to 8.32.2 Vaadin Framework 7 and Vaadin 10 and later do not carry this behaviour and need no upgrade for this issue. Artifacts Maven coordinates / Vulnerable versions / Fixed version com.vaadin:vaadin-server / 8.16.0 - 8.32.1 / >=8.32.2 com.vaadin:vaadin-server-mpr-jakarta / 8.18.0 - 8.32.1 / >=8.32.2
SSVC
Exploitation: none Automatable: yes Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-30 17:17 UTC
CWE
  • CWE-667 - Improper Locking
  • CWE-400 - Uncontrolled Resource Consumption
Assigner
Vaadin CNA under the mitre root
CNA scorecard – unranked: 7 records in the last 180 days, 10 needed details
Impacted products
Vendor Product Version
vaadin framework Affected: 8.16.0 , < 8.32.2 (maven)
Create a notification for this product.
vaadin framework Affected: 8.18.0 , < 8.32.2 (maven)
Create a notification for this product.
Show details on NVD website

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CVE-2026-107674 (GCVE-0-2026-107674)

Vulnerability from cvelistv5 – Published: 2026-10-16 18:00 – Updated: 2026-10-19 14:55
VLAI
Title
IBM i is Affected by a Denial of Service in Digital Certificate Manager
Summary
IBM i 7.3, 7.4, 7.5, and 7.6 is vulnerable to a denial of service to Digital Certificate Manager (DCM) for System TLS using applications attempting to create secure network connections. A bad actor could use this to prevent a service from starting or cause it to fallback to non-secure connections.
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-19 14:55 UTC
CWE
Assigner
ibm CNA under the mitre root
CNA scorecard B 88/100 over 1335 records in the last 180 days details
References
URL Tags
https://www.ibm.com/support/pages/node/7292225 vendor-advisorypatch
Impacted products
Vendor Product Version
IBM i Affected: 7.6
Affected: 7.5
Affected: 7.4
Affected: 7.3
    cpe:2.3:a:ibm:i:7.6:*:*:*:*:*:*:*
    cpe:2.3:a:ibm:i:7.5:*:*:*:*:*:*:*
    cpe:2.3:a:ibm:i:7.4:*:*:*:*:*:*:*
    cpe:2.3:a:ibm:i:7.3:*:*:*:*:*:*:*
Create a notification for this product.
Show details on NVD website

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CVE-2026-106174 (GCVE-0-2026-106174)

Vulnerability from cvelistv5 – Published: 2026-10-27 06:54 – Updated: 2026-10-27 10:13
VLAI
Summary
A improper locking vulnerability in Fortinet FortiOS 8.0.0, FortiOS 7.6.4 through 7.6.6 may allow an unauthenticated attacker with network access to the device to cause a denial of service of the HTTPS management interface via crafted HTTP requests.
SSVC
Exploitation: none Automatable: yes Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-27 10:13 UTC
CWE
Assigner
fortinet CNA under the mitre root
CNA scorecard C 72/100 over 58 records in the last 180 days details
References
Impacted products
Vendor Product Version
Fortinet FortiOS Affected: 8.0.0
Affected: 7.6.4 , ≤ 7.6.6 (semver)
    cpe:2.3:o:fortinet:fortios:8.0.0:*:*:*:*:*:*:*
    cpe:2.3:o:fortinet:fortios:7.6.6:*:*:*:*:*:*:*
    cpe:2.3:o:fortinet:fortios:7.6.5:*:*:*:*:*:*:*
    cpe:2.3:o:fortinet:fortios:7.6.4:*:*:*:*:*:*:*
Create a notification for this product.
Show details on NVD website

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CVE-2026-105113 (GCVE-0-2026-105113)

Vulnerability from cvelistv5 – Published: 2026-10-03 12:14 – Updated: 2026-10-05 14:48
VLAI
Title
Nezha 1.8.0 before 2.3.13 Denial of Service via Notification Mutex Deadlock
Summary
Nezha Dashboard from 1.8.0 before 2.3.13 contains an improper locking vulnerability where a non-deferred mutex unlock leaks on a nil-map panic path. Any authenticated non-admin member can issue four notification API calls to permanently deadlock the alerting subsystem, then exhaust memory with blocking requests.
SSVC
Exploitation: poc Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-05 14:48 UTC
CWE
Assigner
VulnCheck CNA under the mitre root
CNA scorecard B 84/100 over 7380 records in the last 180 days details
References
Impacted products
Vendor Product Version
nezhahq nezha Affected: 1.8.0 , < 2.3.13 (semver)
Unaffected: 2.3.13 (semver)
Create a notification for this product.
Date Public
2026-09-19 00:00
Credits
Show details on NVD website

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CVE-2026-96273 (GCVE-0-2026-96273)

Vulnerability from cvelistv5 – Published: 2026-09-23 00:29 – Updated: 2026-09-28 16:18
VLAI
Title
Ghidra before 12.1.4 Denial of Service via Unreleased Lock in OptionsDB
Summary
Ghidra before 12.1.4 fails to validate the TYPE_COL byte in OptionsDB.createUnregisteredOption(), causing an ArrayIndexOutOfBoundsException that leaves domain objects permanently locked. Attackers can craft a malicious program database file that, when imported, causes the application to stall and prevents resource cleanup or graceful shutdown.
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-23 13:46 UTC
CWE
  • CWE-460 - Improper Cleanup on Thrown Exception
  • CWE-667 - Improper Locking
Assigner
VulnCheck CNA under the mitre root
CNA scorecard B 84/100 over 7380 records in the last 180 days details
Impacted products
Vendor Product Version
NationalSecurityAgency ghidra Affected: 0 , < 12.1.4 (semver)
    cpe:2.3:a:nsa:ghidra:*:*:*:*:*:*:*:*
Create a notification for this product.
Date Public
2026-09-22 00:00
Show details on NVD website

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CVE-2026-80126 (GCVE-0-2026-80126)

Vulnerability from cvelistv5 – Published: 2026-09-07 16:13 – Updated: 2026-09-08 16:54
VLAI
Summary
Dell SCG 5.0 Appliance versions prior to 5.36.00.16 and Dell SCG 5.0 Application versions prior to 5.36.00.00, contains an Improper Locking vulnerability. A low privileged attacker with remote access could potentially exploit this vulnerability, leading to filesystem access for attacker.
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-08 16:37 UTC
CWE
Assigner
dell CNA under the mitre root
CNA scorecard C 70/100 over 527 records in the last 180 days details
References
Impacted products
Vendor Product Version
Dell Secure Connect Gateway 5.0 - Application Affected: 0 , < 5.36.00.00 or later (semver)
Create a notification for this product.
Dell Secure Connect Gateway 5.0 - Appliance Affected: 0 , < 5.36.00.16 or later (semver)
Create a notification for this product.
Date Public
2026-08-31 06:30
Show details on NVD website

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Mitigation
Implementation

Strategy: Libraries or Frameworks

Use industry standard APIs to implement locking mechanism.

CAPEC-25: Forced Deadlock

The adversary triggers and exploits a deadlock condition in the target software to cause a denial of service. A deadlock can occur when two or more competing actions are waiting for each other to finish, and thus neither ever does. Deadlock conditions can be difficult to detect.

CAPEC-26: Leveraging Race Conditions

The adversary targets a race condition occurring when multiple processes access and manipulate the same resource concurrently, and the outcome of the execution depends on the particular order in which the access takes place. The adversary can leverage a race condition by "running the race", modifying the resource and modifying the normal execution flow. For instance, a race condition can occur while accessing a file: the adversary can trick the system by replacing the original file with their version and cause the system to read the malicious file.

CAPEC-27: Leveraging Race Conditions via Symbolic Links

This attack leverages the use of symbolic links (Symlinks) in order to write to sensitive files. An attacker can create a Symlink link to a target file not otherwise accessible to them. When the privileged program tries to create a temporary file with the same name as the Symlink link, it will actually write to the target file pointed to by the attackers' Symlink link. If the attacker can insert malicious content in the temporary file they will be writing to the sensitive file by using the Symlink. The race occurs because the system checks if the temporary file exists, then creates the file. The attacker would typically create the Symlink during the interval between the check and the creation of the temporary file.