CWE-367

Time-of-check Time-of-use (TOCTOU) Race Condition

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.

CVE-2026-21912 (GCVE-0-2026-21912)

Vulnerability from cvelistv5 – Published: 2026-01-15 20:24 – Updated: 2026-01-15 20:50
VLAI
Title
Junos OS: MX10k Series: 'show system firmware' CLI command may lead to LC480 or LC2101 line card reset
Summary
A Time-of-check Time-of-use (TOCTOU) Race Condition vulnerability in the method to collect FPC Ethernet firmware statistics of Juniper Networks Junos OS on MX10k Series allows a local, low-privileged attacker executing the 'show system firmware' CLI command to cause an LC480 or LC2101 line card to reset. On MX10k Series systems with LC480 or LC2101 line cards, repeated execution of the 'show system firmware' CLI command can cause the line card to crash and restart. Additionally, some time after the line card crashes, chassisd may also crash and restart, generating a core dump.This issue affects Junos OS on MX10k Series:  * all versions before 21.2R3-S10,  * from 21.4 before 21.4R3-S9,  * from 22.2 before 22.2R3-S7,  * from 22.4 before 22.4R3-S6,  * from 23.2 before 23.2R2-S2,  * from 23.4 before 23.4R2-S3,  * from 24.2 before 24.2R2.
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
Impacted products
Vendor Product Version
Juniper Networks Junos OS Affected: 0 , < 21.2R3-S10 (semver)
Affected: 21.4 , < 21.4R3-S9 (semver)
Affected: 22.2 , < 22.2R3-S7 (semver)
Affected: 22.4 , < 22.4R3-S6 (semver)
Affected: 23.2 , < 23.2R2-S2 (semver)
Affected: 23.4 , < 23.4R2-S3 (semver)
Affected: 24.2 , < 24.2R2 (semver)
Create a notification for this product.
Date Public
2026-01-14 17:00
Show details on NVD website

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CVE-2026-22281 (GCVE-0-2026-22281)

Vulnerability from cvelistv5 – Published: 2026-01-22 19:11 – Updated: 2026-01-22 19:35
VLAI
Summary
Dell PowerScale OneFS, versions 9.5.0.0 through 9.5.1.5, versions 9.6.0.0 through 9.7.1.10, versions 9.8.0.0 through 9.10.1.3, versions starting from 9.11.0.0 and prior to 9.13.0.0, contains a Time-of-check Time-of-use (TOCTOU) race condition vulnerability. A low privileged attacker with adjacent network access could potentially exploit this vulnerability, leading to denial of service.
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
Impacted products
Vendor Product Version
Dell PowerScale OneFS Affected: N/A , < 9.13.0.0 (semver)
Affected: N/A , < 9.5.1.6 (semver)
Affected: N/A , < 9.7.1.11 (semver)
Affected: N/A , < 9.10.1.4 (semver)
Create a notification for this product.
Date Public
2026-01-22 18:30
Show details on NVD website

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CVE-2026-22701 (GCVE-0-2026-22701)

Vulnerability from cvelistv5 – Published: 2026-01-10 05:59 – Updated: 2026-01-12 16:45
VLAI
Title
filelock Time-of-Check-Time-of-Use (TOCTOU) Symlink Vulnerability in SoftFileLock
Summary
filelock is a platform-independent file lock for Python. Prior to version 3.20.3, a TOCTOU race condition vulnerability exists in the SoftFileLock implementation of the filelock package. An attacker with local filesystem access and permission to create symlinks can exploit a race condition between the permission validation and file creation to cause lock operations to fail or behave unexpectedly. The vulnerability occurs in the _acquire() method between raise_on_not_writable_file() (permission check) and os.open() (file creation). During this race window, an attacker can create a symlink at the lock file path, potentially causing the lock to operate on an unintended target file or leading to denial of service. This issue has been patched in version 3.20.3.
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
  • CWE-59 - Improper Link Resolution Before File Access ('Link Following')
  • CWE-362 - Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')
  • CWE-367 - Time-of-check Time-of-use (TOCTOU) Race Condition
Assigner
Impacted products
Vendor Product Version
tox-dev filelock Affected: < 3.20.3
Create a notification for this product.
Show details on NVD website

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CVE-2026-22820 (GCVE-0-2026-22820)

Vulnerability from cvelistv5 – Published: 2026-01-14 15:06 – Updated: 2026-01-14 15:19
VLAI
Title
Outray cli is vulnerable to race conditions in tunnels creation
Summary
Outray openSource ngrok alternative. Prior to 0.1.5, a TOCTOU race condition vulnerability allows a user to exceed the set number of active tunnels in their subscription plan. This vulnerability is fixed in 0.1.5.
SSVC
Exploitation: poc Automatable: no Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
  • CWE-367 - Time-of-check Time-of-use (TOCTOU) Race Condition
Assigner
References
Impacted products
Vendor Product Version
akinloluwami outray Affected: < 0.1.5
Create a notification for this product.
Show details on NVD website

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CVE-2026-2364 (GCVE-0-2026-2364)

Vulnerability from cvelistv5 – Published: 2026-03-10 07:22 – Updated: 2026-03-10 16:51
VLAI
Title
CODESYS Installer TOCTOU Privilege Escalation
Summary
If a legitimate user confirms a self-update prompt or initiate an installation of a CODESYS Development System, a low privileged local attacker can gain elevated rights due to a TOCTOU vulnerability in the CODESYS installer.
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
Impacted products
Vendor Product Version
CODESYS CODESYS Installer Affected: 0.0.0 , < 2.6.1.0 (semver)
Create a notification for this product.
Credits
David Ruscheweyh from SEW-EURODRIVE GmbH & Co KG
Show details on NVD website

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CVE-2026-23950 (GCVE-0-2026-23950)

Vulnerability from cvelistv5 – Published: 2026-01-20 00:40 – Updated: 2026-01-21 20:15
VLAI
Title
node-tar has Race Condition in Path Reservations via Unicode Ligature Collisions on macOS APFS
Summary
node-tar,a Tar for Node.js, has a race condition vulnerability in versions up to and including 7.5.3. This is due to an incomplete handling of Unicode path collisions in the `path-reservations` system. On case-insensitive or normalization-insensitive filesystems (such as macOS APFS, In which it has been tested), the library fails to lock colliding paths (e.g., `ß` and `ss`), allowing them to be processed in parallel. This bypasses the library's internal concurrency safeguards and permits Symlink Poisoning attacks via race conditions. The library uses a `PathReservations` system to ensure that metadata checks and file operations for the same path are serialized. This prevents race conditions where one entry might clobber another concurrently. This is a Race Condition which enables Arbitrary File Overwrite. This vulnerability affects users and systems using node-tar on macOS (APFS/HFS+). Because of using `NFD` Unicode normalization (in which `ß` and `ss` are different), conflicting paths do not have their order properly preserved under filesystems that ignore Unicode normalization (e.g., APFS (in which `ß` causes an inode collision with `ss`)). This enables an attacker to circumvent internal parallelization locks (`PathReservations`) using conflicting filenames within a malicious tar archive. The patch in version 7.5.4 updates `path-reservations.js` to use a normalization form that matches the target filesystem's behavior (e.g., `NFKD`), followed by first `toLocaleLowerCase('en')` and then `toLocaleUpperCase('en')`. As a workaround, users who cannot upgrade promptly, and who are programmatically using `node-tar` to extract arbitrary tarball data should filter out all `SymbolicLink` entries (as npm does) to defend against arbitrary file writes via this file system entry name collision issue.
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
  • CWE-176 - Improper Handling of Unicode Encoding
  • CWE-352 - Cross-Site Request Forgery (CSRF)
  • CWE-367 - Time-of-check Time-of-use (TOCTOU) Race Condition
Assigner
References
Impacted products
Vendor Product Version
isaacs node-tar Affected: < 7.5.4
Create a notification for this product.
Show details on NVD website

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CVE-2026-23988 (GCVE-0-2026-23988)

Vulnerability from cvelistv5 – Published: 2026-01-22 21:52 – Updated: 2026-01-23 20:13
VLAI
Title
Rufus has Local Privilege Escalation via TOCTOU Race Condition in Fido Script Handling
Summary
Rufus is a utility that helps format and create bootable USB flash drives. Versions 4.11 and below contain a race condition (TOCTOU) in src/net.c during the creation, validation, and execution of the Fido PowerShell script. Since Rufus runs with elevated privileges (Administrator) but writes the script to the %TEMP% directory (writeable by standard users) without locking the file, a local attacker can replace the legitimate script with a malicious one between the file write operation and the execution step. This allows arbitrary code execution with Administrator privileges. This issue has been fixed in version 4.12_BETA.
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
Impacted products
Vendor Product Version
pbatard rufus Affected: < 4.12_BETA
Create a notification for this product.
Show details on NVD website

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CVE-2026-24071 (GCVE-0-2026-24071)

Vulnerability from cvelistv5 – Published: 2026-02-02 13:23 – Updated: 2026-02-03 14:42
VLAI
Title
XPC Client Validation via PID leading to Local Privilege Escalation in Native Instruments Native Access
Summary
It was found that the XPC service offered by the privileged helper of Native Access uses the PID of the connecting client to verify its code signature. This is considered insecure and can be exploited by PID reuse attacks. The connection handler function uses _xpc_connection_get_pid(arg2) as argument for the hasValidSignature function. This value can not be trusted since it is vulnerable to PID reuse attacks.
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
Impacted products
Vendor Product Version
Native Instruments Native Access Affected: verified up to 3.22.0
Create a notification for this product.
Credits
Florian Haselsteiner, SEC Consult Vulnerability Lab
Show details on NVD website

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CVE-2026-24191 (GCVE-0-2026-24191)

Vulnerability from cvelistv5 – Published: 2026-05-26 17:23 – Updated: 2026-05-27 15:40
VLAI
Summary
NVIDIA Display Driver for Windows contains a vulnerability where an attacker could cause a time-of-check time-of-use issue. A successful exploit of this vulnerability might lead to denial of service, escalation of privileges, information disclosure, data tampering, and code execution.
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
Impacted products
Vendor Product Version
NVIDIA GeForce Affected: All driver versions prior to 596.36
Create a notification for this product.
NVIDIA GeForce Affected: All driver versions prior to 582.53 Only GPUs based on the NVIDIA Maxwell, Volta, and Pascal GPU architectures are affected.
Create a notification for this product.
NVIDIA NVIDIA RTX, Quadro, NVS Affected: All driver versions prior to 596.36
Create a notification for this product.
NVIDIA NVIDIA RTX, Quadro, NVS Affected: All driver versions prior to 582.53
Create a notification for this product.
NVIDIA NVIDIA RTX, Quadro, NVS Affected: All driver versions prior to 539.72
Create a notification for this product.
NVIDIA Tesla Affected: All driver versions prior to 596.36
Create a notification for this product.
NVIDIA Tesla Affected: All driver versions prior to 582.53
Create a notification for this product.
NVIDIA Tesla Affected: All driver versions prior to 539.72
Create a notification for this product.
NVIDIA Guest driver Affected: 595.97(All versions prior to and including vGPU 20.0)
Create a notification for this product.
NVIDIA Guest driver Affected: 582.16(All versions prior to and including vGPU 19.4)
Create a notification for this product.
NVIDIA Guest driver Affected: 539.64(All versions prior to and including vGPU 16.13)
Create a notification for this product.
NVIDIA Virtual GPU Manager Affected: 595.94(All versions prior to and including vGPU 20.0)
Create a notification for this product.
NVIDIA Virtual GPU Manager Affected: 582.16(All versions prior to and including vGPU 19.4)
Create a notification for this product.
Show details on NVD website

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CVE-2026-25052 (GCVE-0-2026-25052)

Vulnerability from cvelistv5 – Published: 2026-02-04 16:47 – Updated: 2026-02-05 14:36
VLAI
Title
n8n Improper File Access Controls Allow Arbitrary File Read by Authenticated Users
Summary
n8n is an open source workflow automation platform. Prior to versions 1.123.18 and 2.5.0, a vulnerability in the file access controls allows authenticated users with permission to create or modify workflows to read sensitive files from the n8n host system. This can be exploited to obtain critical configuration data and user credentials, leading to complete account takeover of any user on the instance. This issue has been patched in versions 1.123.18 and 2.5.0.
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
Impacted products
Vendor Product Version
n8n-io n8n Affected: < 1.123.18
Affected: < 2.5.0
Create a notification for this product.
Show details on NVD website

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Mitigation

Phase: Implementation

Description:

  • 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

Phase: Implementation

Description:

  • 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

Phase: Architecture and Design

Description:

  • Limit the interleaving of operations on files from multiple processes.
Mitigation

Phases: Implementation, Architecture and Design

Description:

  • 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

Phase: Implementation

Description:

  • Recheck the resource after the use call to verify that the action was taken appropriately.
Mitigation

Phase: Architecture and Design

Description:

  • Ensure that some environmental locking mechanism can be used to protect resources effectively.
Mitigation

Phase: Implementation

Description:

  • 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.

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