Common Weakness Enumeration
CWE-367
AllowedTime-of-check Time-of-use (TOCTOU) Race Condition
Abstraction: Base · Status: Incomplete
The product checks the state of a resource before using that resource, but the resource's state can change between the check and the use in a way that invalidates the results of the check.
1063 vulnerabilities reference this CWE, most recent first.
CVE-2026-0924 (GCVE-0-2026-0924)
Vulnerability from cvelistv5 – Published: 2026-02-02 20:18 – Updated: 2026-04-21 02:40
VLAI
EPSS
VEX
Title
BuhoCleaner 1.15.2 - Local Privilege Escalation via PID reuse attack
Summary
BuhoCleaner contains an insecure XPC service that allows local, unprivileged users to escalate their privileges to root via insecure functions.This issue affects BuhoCleaner: 1.15.2.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: total
CISA Coordinator (v2.0.3)
CWE
- CWE-367 - Time-of-check Time-of-use (TOCTOU) Race Condition
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://fluidattacks.com/advisories/solstafir | third-party-advisory |
| https://www.drbuho.com/buhocleaner | product |
| https://www.drbuho.com/buhocleaner/download | patch |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Dr.Buho | BuhoCleaner |
Affected:
1.15.2
|
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CVE-2025-69233 (GCVE-0-2025-69233)
Vulnerability from cvelistv5 – Published: 2026-05-08 12:19 – Updated: 2026-05-09 06:43
VLAI
EPSS
VEX
Title
Apache CloudStack: Domain/account resources limits not honored
Summary
Due to multiple time-of-check time-of-use race conditions in the resource count check and increment logic, as well as missing validations, users of the platform are able to exceed the allocation limits configured for their accounts/domains. This can be used by an attacker to degrade the infrastructure's resources and lead to denial of service conditions.
Users are recommended to upgrade to Apache CloudStack versions 4.20.3.0 or 4.22.0.1, or later, which fixes this issue.
Severity
6.5 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
Assigner
References
2 references
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Apache Software Foundation | Apache CloudStack |
Affected:
4.0.0 , ≤ 4.20.2.0
(semver)
Affected: 4.21.0.0 , ≤ 4.22.0.0 (semver) |
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CVE-2025-69211 (GCVE-0-2025-69211)
Vulnerability from cvelistv5 – Published: 2025-12-29 16:01 – Updated: 2025-12-29 16:50
VLAI
EPSS
VEX
Title
Nest has a Fastify URL Encoding Middleware Bypass (TOCTOU)
Summary
Nest is a framework for building scalable Node.js server-side applications. Versions prior to 11.1.11 have a Fastify URL encoding middleware bypass. A NestJS application is vulnerable if it uses `@nestjs/platform-fastify`; relies on `NestMiddleware` (via `MiddlewareConsumer`) for security checks (authentication, authorization, etc.), or through `app.use()`; and applies middleware to specific routes using string paths or controllers (e.g., `.forRoutes('admin')`). Exploitation can result in unauthenticated users accessing protected routes, restricted administrative endpoints becoming accessible to lower-privileged users, and/or middleware performing sanitization or validation being skipped. This issue is patched in `@nestjs/platform-fastify@11.1.11`.
Severity
SSVC
Exploitation: poc
Automatable: no
Technical Impact: total
CISA Coordinator (v2.0.3)
CWE
- CWE-367 - Time-of-check Time-of-use (TOCTOU) Race Condition
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://github.com/nestjs/nest/security/advisorie… | x_refsource_CONFIRM |
| https://github.com/nestjs/nest/commit/c4cedda15a0… | x_refsource_MISC |
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CVE-2025-68146 (GCVE-0-2025-68146)
Vulnerability from cvelistv5 – Published: 2025-12-16 18:10 – Updated: 2025-12-17 18:51
VLAI
EPSS
VEX
Title
filelock has TOCTOU race condition that allows symlink attacks during lock file creation
Summary
filelock is a platform-independent file lock for Python. In versions prior to 3.20.1, a Time-of-Check-Time-of-Use (TOCTOU) race condition allows local attackers to corrupt or truncate arbitrary user files through symlink attacks. The vulnerability exists in both Unix and Windows lock file creation where filelock checks if a file exists before opening it with O_TRUNC. An attacker can create a symlink pointing to a victim file in the time gap between the check and open, causing os.open() to follow the symlink and truncate the target file. All users of filelock on Unix, Linux, macOS, and Windows systems are impacted. The vulnerability cascades to dependent libraries. The attack requires local filesystem access and ability to create symlinks (standard user permissions on Unix; Developer Mode on Windows 10+). Exploitation succeeds within 1-3 attempts when lock file paths are predictable. The issue is fixed in version 3.20.1. If immediate upgrade is not possible, use SoftFileLock instead of UnixFileLock/WindowsFileLock (note: different locking semantics, may not be suitable for all use cases); ensure lock file directories have restrictive permissions (chmod 0700) to prevent untrusted users from creating symlinks; and/or monitor lock file directories for suspicious symlinks before running trusted applications. These workarounds provide only partial mitigation. The race condition remains exploitable. Upgrading to version 3.20.1 is strongly recommended.
Severity
6.3 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
Assigner
References
4 references
| URL | Tags |
|---|---|
| https://github.com/tox-dev/filelock/security/advi… | x_refsource_CONFIRM |
| https://github.com/tox-dev/filelock/pull/461 | x_refsource_MISC |
| https://github.com/tox-dev/filelock/commit/4724d7… | x_refsource_MISC |
| https://github.com/tox-dev/filelock/releases/tag/3.20.1 | x_refsource_MISC |
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CVE-2025-64645 (GCVE-0-2025-64645)
Vulnerability from cvelistv5 – Published: 2025-12-26 14:24 – Updated: 2026-02-26 16:07
VLAI
EPSS
VEX
Title
Multiple Vulnerabilities in IBM Concert Software.
Summary
IBM Concert 1.0.0 through 2.1.0 could allow a local user to escalate their privileges due to a race condition of a symbolic link.
Severity
7.7 (High)
SSVC
Exploitation: none
Automatable: no
Technical Impact: total
CISA Coordinator (v2.0.3)
CWE
- CWE-367 - Time-of-check Time-of-use (TOCTOU) Race Condition
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://www.ibm.com/support/pages/node/7255549 | vendor-advisorypatch |
Impacted products
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CVE-2025-64457 (GCVE-0-2025-64457)
Vulnerability from cvelistv5 – Published: 2025-11-10 13:28 – Updated: 2026-02-26 17:47
VLAI
EPSS
VEX
Summary
In JetBrains ReSharper, Rider and dotTrace before 2025.2.5 local privilege escalation was possible via race condition
Severity
4.2 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: total
CISA Coordinator (v2.0.3)
CWE
- CWE-367 - Time-of-check Time-of-use (TOCTOU) Race Condition
Assigner
References
1 reference
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| JetBrains | ReSharper, Rider and dotTrace |
Affected:
0 , < 2025.2.5
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CVE-2025-64180 (GCVE-0-2025-64180)
Vulnerability from cvelistv5 – Published: 2025-11-07 02:58 – Updated: 2026-01-07 17:09
VLAI
EPSS
VEX
Title
Manager-io/Manager: Complete Bypass of SSRF Protection via Time-of-Check Time-of-Use (TOCTOU)
Summary
Manager-io/Manager is accounting software. In Manager Desktop and Server versions 25.11.1.3085 and below, a critical vulnerability permits unauthorized access to internal network resources. The flaw lies in the fundamental design of the DNS validation mechanism. A Time-of-Check Time-of-Use (TOCTOU) condition that allows attackers to bypass network isolation and access internal services, cloud metadata endpoints, and protected network segments. The Desktop edition requires no authentication; the Server edition requires only standard authentication. This issue is fixed in version 25.11.1.3086.
Severity
10 (Critical)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: total
CISA Coordinator (v2.0.3)
CWE
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://github.com/Manager-io/Manager/security/ad… | x_refsource_CONFIRM |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Manager-io | Manager |
Affected:
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CVE-2025-64118 (GCVE-0-2025-64118)
Vulnerability from cvelistv5 – Published: 2025-10-30 17:50 – Updated: 2025-10-30 18:42
VLAI
EPSS
VEX
Title
node-tar vulnerable to race condition leading to uninitialized memory exposure
Summary
node-tar is a Tar for Node.js. In 7.5.1, using .t (aka .list) with { sync: true } to read tar entry contents returns uninitialized memory contents if tar file was changed on disk to a smaller size while being read. This vulnerability is fixed in 7.5.2.
Severity
SSVC
Exploitation: poc
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
Assigner
References
4 references
| URL | Tags |
|---|---|
| https://github.com/isaacs/node-tar/security/advis… | x_refsource_CONFIRM |
| https://github.com/isaacs/node-tar/issues/445 | x_refsource_MISC |
| https://github.com/isaacs/node-tar/pull/446 | x_refsource_MISC |
| https://github.com/isaacs/node-tar/commit/5330eb0… | x_refsource_MISC |
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CVE-2025-62724 (GCVE-0-2025-62724)
Vulnerability from cvelistv5 – Published: 2025-11-20 16:53 – Updated: 2025-11-21 16:56
VLAI
EPSS
VEX
Title
Open OnDemand allowlist bypass using symlinks in directory downloads (TOCTOU)
Summary
Open OnDemand is an open-source HPC portal. Prior to versions 4.0.8 and 3.1.16, users can craft a "Time of Check to Time of Use" (TOCTOU) attack when downloading zip files to access files outside of the OOD_ALLOWLIST. This vulnerability impacts sites that use the file browser allowlists in all current versions of OOD. However, files accessed are still protected by the UNIX permissions. Open OnDemand versions 4.0.8 and 3.1.16 have been patched for this vulnerability.
Severity
4.3 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://github.com/OSC/ondemand/security/advisori… | x_refsource_CONFIRM |
Impacted products
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CVE-2025-62511 (GCVE-0-2025-62511)
Vulnerability from cvelistv5 – Published: 2025-10-17 19:55 – Updated: 2025-10-17 20:22
VLAI
EPSS
VEX
Title
yt-grabber-tui local arbitrary file overwrite via TOCTOU race in config file creation
Summary
yt-grabber-tui is a C++ terminal user interface application for downloading YouTube content. yt-grabber-tui version 1.0 contains a Time-of-Check to Time-of-Use (TOCTOU) race condition (CWE-367) in the creation of the default configuration file config.json. In version 1.0, load_json_settings in Settings.hpp checks for the existence of config.json using boost::filesystem::exists and, if the file is missing, calls create_json_settings which writes the JSON configuration with boost::property_tree::write_json. A local attacker with write access to the application’s configuration directory (~/.config/yt-grabber-tui on Linux or the current working directory on Windows) can create a symbolic link between the existence check and the subsequent write so that the write operation follows the symlink and overwrites an attacker-chosen file accessible to the running process. This enables arbitrary file overwrite within the privileges of the application process, which can corrupt files and cause loss of application or user data. If the application is executed with elevated privileges, this could extend to system file corruption. The issue is fixed in version 1.0.1.
Severity
6.3 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-367 - Time-of-check Time-of-use (TOCTOU) Race Condition
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://github.com/zheny-creator/YtGrabber-TUI/se… | x_refsource_CONFIRM |
| https://github.com/zheny-creator/YtGrabber-TUI/co… | x_refsource_MISC |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| zheny-creator | YtGrabber-TUI |
Affected:
< 1.0.1
|
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Mitigation
Implementation
The most basic advice for TOCTOU vulnerabilities is to not perform a check before the use. This does not resolve the underlying issue of the execution of a function on a resource whose state and identity cannot be assured, but it does help to limit the false sense of security given by the check.
Mitigation
Implementation
When the file being altered is owned by the current user and group, set the effective gid and uid to that of the current user and group when executing this statement.
Mitigation
Architecture and Design
Limit the interleaving of operations on files from multiple processes.
Mitigation
Implementation
Architecture and Design
If you cannot perform operations atomically and you must share access to the resource between multiple processes or threads, then try to limit the amount of time (CPU cycles) between the check and use of the resource. This will not fix the problem, but it could make it more difficult for an attack to succeed.
Mitigation
Implementation
Recheck the resource after the use call to verify that the action was taken appropriately.
Mitigation
Architecture and Design
Ensure that some environmental locking mechanism can be used to protect resources effectively.
Mitigation
Implementation
Ensure that locking occurs before the check, as opposed to afterwards, such that the resource, as checked, is the same as it is when in use.
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.
CAPEC-29: Leveraging Time-of-Check and Time-of-Use (TOCTOU) Race Conditions
This attack targets a race condition occurring between the time of check (state) for a resource and the time of use of a resource. A typical example is file access. The adversary can leverage a file access race condition by "running the race", meaning that they would modify the resource between the first time the target program accesses the file and the time the target program uses the file. During that period of time, the adversary could replace or modify the file, causing the application to behave unexpectedly.