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.
1403 vulnerabilities reference this CWE, most recent first.
CVE-2026-50631 (GCVE-0-2026-50631)
Vulnerability from cvelistv5 – Published: 2026-06-12 08:59 – Updated: 2026-08-07 12:43
VLAI
EPSS
VEX
Title
Apache CXF: OAuth2: TOCTOU Race Condition in Refresh Token Processing
Summary
A race condition in AbstractOAuthDataProvider allows concurrent requests using the same Refresh Token to bypass single-use semantics and generate multiple valid Access Tokens, when 'recycleRefreshTokens' is set to false. A leaked refresh token can be replayed concurrently by multiple attackers or threads. Users are recommended to upgrade to versions 4.2.2 or 4.1.7 or 3.6.12, which fixes this issue.
Severity
7.4 (High)
SSVC
Exploitation: none
Automatable: no
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-06-12 14:03 UTC
CWE
- CWE-367 - Time-of-check Time-of-use (TOCTOU) Race Condition
Assigner
References
2 references
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Apache Software Foundation | Apache CXF |
Affected:
4.2.0 , < 4.2.2
(semver)
Affected: 4.0.0 , < 4.1.7 (semver) Affected: 0 , < 3.6.12 (semver) |
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CVE-2026-49958 (GCVE-0-2026-49958)
Vulnerability from cvelistv5 – Published: 2026-06-09 16:35 – Updated: 2026-07-14 21:33 X_Open Source
VLAI
EPSS
VEX
Title
Hermes WebUI < 0.51.303 TOCTOU Race Condition via git_discard
Summary
Hermes WebUI before version 0.51.303 contains a time-of-check time-of-use (TOCTOU) race condition vulnerability in the git_discard function within api/workspace_git.py that allows attackers to delete files outside the configured workspace boundary by replacing a validated path component with a symlink after validation but before deletion. Attackers can substitute a workspace-controlled path component with a symlink pointing to an external directory between the safe_resolve_ws() validation step and the subsequent Path.unlink() or shutil.rmtree() deletion call, causing the delete operation to follow the symlink and remove arbitrary files outside the workspace.
Severity
SSVC
Exploitation: poc
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-06-09 18:26 UTC
CWE
- CWE-367 - Time-of-check Time-of-use (TOCTOU) Race Condition
Assigner
References
5 references
| URL | Tags |
|---|---|
| https://github.com/nesquena/hermes-webui/releases… | release-notes |
| https://github.com/nesquena/hermes-webui/pull/3702 | issue-tracking |
| https://github.com/nesquena/hermes-webui/pull/3756 | issue-tracking |
| https://github.com/nesquena/hermes-webui/commit/4… | patch |
| https://www.vulncheck.com/advisories/hermes-webui… | third-party-advisory |
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1 product
| Vendor | Product | Version | |
|---|---|---|---|
| nesquena | hermes-webui |
Affected:
0 , < 0.51.303
(semver)
cpe:2.3:a:get-hermes:hermes_web_ui:*:*:*:*:*:*:*:* |
Date Public
2026-06-06 00:00
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CVE-2026-49415 (GCVE-0-2026-49415)
Vulnerability from cvelistv5 – Published: 2026-08-19 04:38 – Updated: 2026-08-20 18:35
VLAI
EPSS
VEX
Title
Local privilege escalation via execve(2) TOCTOU race
Summary
During execve(2) of a SUID binary, the new virtual address space is installed before the process credentials are updated. During this window, a process running as the same user can access the target process's memory via procfs or linprocfs, because the kernel's debugging permission check still saw the original credentials.
An unprivileged local user can exploit this race to modify the address space of a SUID binary before its credentials are elevated, potentially gaining full control of the affected system.
Severity
8.8 (High)
SSVC
Exploitation: none
Automatable: no
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-20 03:56 UTC
CWE
- CWE-367 - Time-of-check Time-of-use (TOCTOU) Race Condition
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://security.freebsd.org/advisories/FreeBSD-S… | vendor-advisory |
Impacted products
Date Public
2026-06-30 20:00
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CVE-2026-49262 (GCVE-0-2026-49262)
Vulnerability from cvelistv5 – Published: 2026-08-12 14:04 – Updated: 2026-08-12 15:18
VLAI
EPSS
VEX
Title
Aimeos Pagible CMS vulnerable to Server Side Request Forgery (SSRF) via DNS rebinding in admin proxy
Summary
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Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-12 15:17 UTC
CWE
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://github.com/aimeos/pagible/security/adviso… | x_refsource_CONFIRM |
| https://github.com/aimeos/pagible/commit/09a8205d… | x_refsource_MISC |
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CVE-2026-49114 (GCVE-0-2026-49114)
Vulnerability from cvelistv5 – Published: 2026-08-21 16:10 – Updated: 2026-08-21 16:43
VLAI
EPSS
VEX
Title
ONNX symlink-following and path-traversal arbitrary file write
Summary
In ONNX before 1.21.0, the 'save_external_data' function builds the external-data file path from the model's external_data location field and opens it for writing without 'O_NOFOLLOW/O_EXCL', after a non-atomic 'os.path.isfile()' check. A local attacker with write access to the directory where a victim serializes external data can deterministically pre-plant a symlink that is being followed, causing the victim's write to append to any file the victim can write, e.g. ~/.ssh/authorized_keys, cron files, or application configs. Fixed in 1.21.0.
Severity
SSVC
Exploitation: poc
Automatable: no
Technical Impact: partial
CISA Coordinator · cisa-cg (v2.0.3)
Decision recorded 2026-05-27 16:00 UTC
CWE
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://github.com/onnx/onnx/security/advisories/… | vendor-advisoryexploit |
| https://raw.githubusercontent.com/cisagov/CSAF/de… | third-party-advisory |
| https://www.cve.org/CVERecord?id=CVE-2026-49114 | vdb-entry |
Impacted products
Date Public
2026-03-31 00:00
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CVE-2026-48983 (GCVE-0-2026-48983)
Vulnerability from cvelistv5 – Published: 2026-06-18 19:07 – Updated: 2026-06-22 12:41
VLAI
EPSS
VEX
Title
pam_usb: TOCTOU race condition in pad directory creation allows symlink substitution
Summary
pam_usb provides hardware authentication for Linux using ordinary removable media. In versions prior to 0.9.2, a symlink race condition exists in per-device and per-user pad directory creation. pam_usb uses a check-then-act pattern: it calls lstat() to test for existence and then calls mkdir() separately to create the directory. A local attacker can win the race between these calls by replacing the target path with a symlink to a directory they control. If successful, one-time pad files may be written to an attacker-controlled location, potentially exposing future pad values before use or disrupting authentication. This issue has been fixed in version 0.9.2.
Severity
5.8 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-06-22 12:41 UTC
CWE
- CWE-367 - Time-of-check Time-of-use (TOCTOU) Race Condition
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://github.com/mcdope/pam_usb/security/adviso… | x_refsource_CONFIRM |
| https://github.com/mcdope/pam_usb/releases/tag/0.9.2 | x_refsource_MISC |
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CVE-2026-48931 (GCVE-0-2026-48931)
Vulnerability from cvelistv5 – Published: 2026-06-22 18:59 – Updated: 2026-07-03 00:32
VLAI
EPSS
VEX
Summary
A flaw in Node.js HTTP Agent can cause a client to accept as valid a response that is send before the client has sent the request.
This vulnerability affects all supported release lines: **Node.js 22**, **Node.js 24**, and **Node.js 26**.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-06-23 14:14 UTC
CWE
- CWE-367 - Time-of-check Time-of-use (TOCTOU) Race Condition
Assigner
References
Impacted products
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CVE-2026-48344 (GCVE-0-2026-48344)
Vulnerability from cvelistv5 – Published: 2026-07-14 20:21 – Updated: 2026-08-27 22:39
VLAI
EPSS
VEX
Title
GoCart | Time-of-check Time-of-use (TOCTOU) Race Condition (CWE-367)
Summary
Creative Cloud Desktop is affected by a Time-of-check Time-of-use (TOCTOU) Race Condition vulnerability that could result in arbitrary code execution in the context of the current user. Exploit depends on conditions beyond the attacker's control. Exploitation of this issue does not require user interaction. Scope is changed.
Severity
7.8 (High)
SSVC
Exploitation: none
Automatable: no
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-07-15 03:59 UTC
CWE
- CWE-367 - Time-of-check Time-of-use (TOCTOU) Race Condition (CWE-367)
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://helpx.adobe.com/security/products/creativ… | vendor-advisory |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Adobe | Creative Cloud Desktop |
Affected:
0 , ≤ 6.9.1.1
(custom)
Unaffected: 6.10.0.252.3 (custom) |
Date Public
2026-07-14 17:00
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CVE-2026-47746 (GCVE-0-2026-47746)
Vulnerability from cvelistv5 – Published: 2026-08-03 21:56 – Updated: 2026-08-04 14:11
VLAI
EPSS
VEX
Title
Misskey: JSON-LD signature validation + compaction is vulnerable to timing attacks
Summary
Misskey is an open source, federated social media platform. Versions 12.37.0 and later, but prior to 2026.5.4, are vulnerable to timing attacks during JSON-LD signature validation and the compaction process. Because the JSON-LD parsing context is not shared between signature verification and subsequent processing, the application may trust information that should not be trusted, resulting in a time-of-check to time-of-use (TOCTOU) flaw. This allows an attacker to have fraudulent activities accepted as valid, leading to a loss of integrity. This issue has been fixed in version 2026.5.4.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-04 14:11 UTC
CWE
- CWE-367 - Time-of-check Time-of-use (TOCTOU) Race Condition
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://github.com/misskey-dev/misskey/security/a… | x_refsource_CONFIRM |
| https://github.com/misskey-dev/misskey/releases/t… | x_refsource_MISC |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| misskey-dev | misskey |
Affected:
>= 12.37.0, < 2026.5.4
|
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CVE-2026-47621 (GCVE-0-2026-47621)
Vulnerability from cvelistv5 – Published: 2026-08-04 17:33 – Updated: 2026-08-04 18:25
VLAI
EPSS
VEX
Summary
NVIDIA Dynamo for Linux contains a vulnerability where an attacker could cause a race condition in the LoRA manager singleton initialization. A successful exploit of this vulnerability might lead to denial of service and data tampering.
Severity
6.5 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-04 18:25 UTC
CWE
- CWE-367 - Time-of-check Time-of-use (TOCTOU) Race Condition
Assigner
References
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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.