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Common Weakness Enumeration

CWE-367

Allowed

Time-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.

1277 vulnerabilities reference this CWE, most recent first.

CVE-2026-88924 (GCVE-0-2026-88924)

Vulnerability from cvelistv5 – Published: 2026-09-10 14:32 – Updated: 2026-09-11 21:19
VLAI
Title
Gvfs: gvfs-admin socket ownership race permits local root
Summary
A flaw was found in the admin backend of gvfs. The privileged gvfsd-admin daemon changes the ownership of newly created private D-Bus sockets by calling the link-following chown() function on a pathname inside a user-controlled directory. A local attacker can exploit this via a Time-of-Check Time-of-Use (TOCTOU) race condition and exchange the socket pathname with a symbolic link pointing to an arbitrary root-owned file (such as /etc/pam.d/su). The daemon subsequently follows the symlink and changes the ownership of the targeted root-owned file to the attacker's user ID. This allows an authenticated local attacker to modify critical system files, leading to a full local privilege escalation to root.
SSVC
Exploitation: poc Automatable: no Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-10 17:32 UTC
CWE
  • CWE-367 - Time-of-check Time-of-use (TOCTOU) Race Condition
Impacted products
Vendor Product Version
GNOME gvfs Affected: 1.48.1 , < 1.62.0 (semver)
Affected: 1.48.1 , < 1.60.3 (semver)
Affected: 1.48.1 , < 1.58.5 (semver)
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Red Hat Red Hat Enterprise Linux 10     cpe:/o:redhat:enterprise_linux:10
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Red Hat Red Hat Enterprise Linux 6     cpe:/o:redhat:enterprise_linux:6
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Red Hat Red Hat Enterprise Linux 7     cpe:/o:redhat:enterprise_linux:7
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Red Hat Red Hat Enterprise Linux 8     cpe:/o:redhat:enterprise_linux:8
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Red Hat Red Hat Enterprise Linux 9     cpe:/o:redhat:enterprise_linux:9
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Date Public
2026-09-09 00:00
Show details on NVD website

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CVE-2026-87996 (GCVE-0-2026-87996)

Vulnerability from cvelistv5 – Published: 2026-09-09 21:28 – Updated: 2026-09-10 13:48
VLAI
Title
Open WebUI: SSRF into internal services via DNS rebinding in the Playwright web loader
Summary
Open WebUI is an extensible, feature-rich, and user-friendly self-hosted AI platform. From 0.9.6 until 0.11.1, SafePlaywrightURLLoader in backend/open_webui/retrieval/web/utils.py validated a user-controlled hostname in Python and then let the Playwright browser resolve it again in the sync and async request interceptors. An authenticated user controlling authoritative DNS could return a public address to validation and an internal address to the browser, exposing responses from internal services or cloud metadata through web search or URL ingestion. This issue is fixed in version 0.11.1.
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-10 13:48 UTC
CWE
  • CWE-367 - Time-of-check Time-of-use (TOCTOU) Race Condition
  • CWE-918 - Server-Side Request Forgery (SSRF)
Impacted products
Vendor Product Version
open-webui open-webui Affected: >= 0.9.6, < 0.11.1
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Show details on NVD website

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CVE-2026-86836 (GCVE-0-2026-86836)

Vulnerability from cvelistv5 – Published: 2026-09-14 17:44 – Updated: 2026-09-15 08:18
VLAI
Summary
In Eclipse Ankaios versions 0.1.0 through 1.0.2, the agent creates workload files and Control Interface named pipes (FIFOs) under a predictable path derived from the agent name and a hash of the workload's runtime configuration. If a directory or FIFO already exists at that path when the agent (re)starts, the agent reuses it based only on an existence and/or file-type check, without validating its owner or permissions. A local, unprivileged user with write access to the same base directory (by default under `$TMPDIR/ankaios`, e.g. shared `/tmp`) can pre-create this path hierarchy, including the two Control Interface FIFOs, before the agent starts. The agent then treats the attacker-owned FIFOs as the legitimate Control Interface for the targeted workload. The attacker can complete the Control Interface handshake and issue requests using that workload's configured `controlInterfaceAccess` permissions, allowing impersonation of the workload and, depending on its configured permissions, unauthorized reading and/or modification of the cluster's desired state.
SSVC
Exploitation: none Automatable: no Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-14 18:00 UTC
Impacted products
Vendor Product Version
Eclipse Foundation Eclipse Ankaios Affected: 0.1.0 , ≤ 1.0.2 (semver)
Create a notification for this product.
Show details on NVD website

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CVE-2026-82430 (GCVE-0-2026-82430)

Vulnerability from cvelistv5 – Published: 2026-09-14 14:15 – Updated: 2026-09-14 20:00
VLAI
Title
Apache Storm Worker Launcher: Local Privilege Escalation to Root via Container Command Files Chowned to the Tenant
Summary
Description When launching a Docker or OCI worker, the setuid-root `worker-launcher` first changes ownership of the entire worker directory to the untrusted topology user, and only afterwards reads and acts on the command file that the supervisor wrote into that same directory. The file is opened without `O_NOFOLLOW` and without re-verifying its owner, so between the ownership change and the read the tenant can replace its contents. For the Docker path the parsed command is executed with real uid 0, and the command sanitiser is not a privilege boundary: it admits `-v` with an arbitrary source, `--device`, `--cap-add`, `--security-opt`, `--user` and `--net`, and copies positional arguments through verbatim. A rewritten file therefore yields an attacker-authored, root-equivalent container invocation with the host filesystem available. For the OCI path the same rewrite window applies, and mount validation is structural only, with no source or destination allow-list, so arbitrary host paths can be bind-mounted read-write into the container. The `username` field of the command file is likewise attacker-settable and is checked only against non-root and minimum-uid rules, permitting execution as another tenant's uid. Mitigation Upgrade to 3.1.0, where the command file is validated before the ownership change and re-verified on open, and where mount sources and destinations are constrained by configuration. Users who cannot upgrade immediately should disable Docker and OCI worker isolation, or restrict topology submission on affected supervisors to trusted principals. Note that the launcher must be rebuilt and reinstalled after upgrading. Credit The ASF -- found using Claude agents to study the security of open-source projects, validated and reported by Apache Storm.
SSVC
Exploitation: none Automatable: no Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-14 20:00 UTC
CWE
  • CWE-367 - Time-of-check time-of-use (TOCTOU) race condition
Impacted products
Show details on NVD website

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CVE-2026-82429 (GCVE-0-2026-82429)

Vulnerability from cvelistv5 – Published: 2026-09-14 14:16 – Updated: 2026-09-14 20:00
VLAI
Title
Apache Storm Worker Launcher: Local Privilege Escalation to Root via a Time-of-Check Race in the Worker Launcher
Summary
Description The setuid-root `worker-launcher` binary adjusts ownership and permissions of worker directories by walking the tree with FTS and calling `lchown` and `chmod` on each entry's full pathname while running with an effective uid of 0. Both syscalls re-resolve the path at the time of the call, after FTS has classified the entry, and the trees being walked are owned and writable by the untrusted topology user. A tenant running code on a supervisor node could therefore replace an intermediate directory component with a symbolic link between classification and the privileged operation, redirecting the root-owned `lchown` or `chmod` at an arbitrary file on the host. The operation is repeatable at will, since crashing a worker forces a relaunch and blob updates re-run the walk, so a failed attempt costs the attacker nothing. This crosses the boundary that `supervisor.run.worker.as.user` and container isolation are intended to enforce. It is the same defect class as the Hadoop container-executor issues from which this code derives. Mitigation Upgrade to 3.1.0, where the privileged walk operates on file descriptors it has already stat'd rather than on pathnames re-resolved at call time. Users who cannot upgrade immediately should not run untrusted topology code on supervisors configured with `supervisor.run.worker.as.user`, since the launcher is the boundary being crossed. Note that the launcher must be rebuilt and reinstalled after upgrading; replacing the Java artifacts alone is not sufficient. Credit The ASF -- found using Claude agents to study the security of open-source projects, validated and reported by Apache Storm.
SSVC
Exploitation: none Automatable: no Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-14 19:59 UTC
CWE
  • CWE-367 - Time-of-check time-of-use (TOCTOU) race condition
Impacted products
Show details on NVD website

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CVE-2026-82238 (GCVE-0-2026-82238)

Vulnerability from cvelistv5 – Published: 2026-08-28 10:49 – Updated: 2026-08-31 18:29
VLAI
Title
filebrowser 2.24.0 Race Condition via TUS concurrent PATCH uploads
Summary
filebrowser from version 2.24.0 contains a race condition in the TUS upload handler that allows authenticated users to write past the declared Upload-Length by sending concurrent PATCH requests. Attackers can send multiple simultaneous PATCH requests at the same offset to bypass length validation, resulting in files that exceed their declared size and triggering completion hooks for oversized uploads.
SSVC
Exploitation: poc Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-31 18:28 UTC
CWE
  • CWE-367 - Time-of-check Time-of-use (TOCTOU) Race Condition
References
Impacted products
Vendor Product Version
filebrowser filebrowser Unaffected: 0 , < 2.24.0 (semver)
    cpe:2.3:a:filebrowser:filebrowser:*:*:*:*:*:*:*:*
Create a notification for this product.
Date Public
2026-08-14 00:00
Show details on NVD website

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CVE-2026-79994 (GCVE-0-2026-79994)

Vulnerability from cvelistv5 – Published: 2026-09-15 20:33 – Updated: 2026-09-16 17:57
VLAI
Title
Docker Sandboxes UDS forwarder can reach arbitrary host Unix sockets through a symlink race
Summary
The guest-to-host Unix-domain socket relay in Docker Sandboxes validates that a socket path is inside an authorized workspace, but later reconnects using the pathname. A malicious guest can replace an intermediate directory with a symlink between validation and connection, causing the host to connect to an arbitrary AF_UNIX socket outside the shared workspace. This can expose data or host-side capabilities provided by the targeted socket.
SSVC
Exploitation: none Automatable: no Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-16 17:56 UTC
CWE
  • CWE-367 - Time-of-check Time-of-use (TOCTOU) Race Condition
Impacted products
Vendor Product Version
Docker Docker Sandboxes Affected: 0.37.0 , < 0.42.0 (semver)
    cpe:2.3:a:docker:docker_sandboxes:*:*:*:*:*:*:*:*
Create a notification for this product.
Show details on NVD website

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CVE-2026-79968 (GCVE-0-2026-79968)

Vulnerability from cvelistv5 – Published: 2026-09-09 13:02 – Updated: 2026-09-14 13:12
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 a Time-of-check Time-of-use (TOCTOU) Race Condition vulnerability. An unauthenticated attacker with remote access could potentially exploit this vulnerability, leading to denial of service.
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-14 13:11 UTC
CWE
  • CWE-367 - Time-of-check Time-of-use (TOCTOU) Race Condition
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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CVE-2026-79730 (GCVE-0-2026-79730)

Vulnerability from cvelistv5 – Published: 2026-09-09 11:51 – Updated: 2026-09-14 13:10
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 a Time-of-check Time-of-use (TOCTOU) Race Condition vulnerability. An unauthenticated attacker with remote access could potentially exploit this vulnerability, leading to denial of service.
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-14 13:10 UTC
CWE
  • CWE-367 - Time-of-check Time-of-use (TOCTOU) Race Condition
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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CVE-2026-78464 (GCVE-0-2026-78464)

Vulnerability from cvelistv5 – Published: 2026-09-08 17:18 – Updated: 2026-09-16 21:58
VLAI
Title
Windows MIDI Service Module Elevation of Privileges Vulnerability
Summary
Time-of-check time-of-use (toctou) race condition in Windows MIDI Service Module allows an authorized attacker to elevate privileges locally.
SSVC
Exploitation: none Automatable: no Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-09 04:22 UTC
CWE
  • CWE-367 - Time-of-check Time-of-use (TOCTOU) Race Condition
References
Impacted products
Vendor Product Version
Microsoft Windows 11 Version 24H2 Affected: 10.0.26100.0 , < 10.0.26100.9445 (custom)
Create a notification for this product.
Microsoft Windows 11 Version 25H2 Affected: 10.0.26200.0 , < 10.0.26200.9445 (custom)
Create a notification for this product.
Microsoft Windows 11 version 26H1 Affected: 10.0.28000.0 , < 10.0.28000.2954 (custom)
Create a notification for this product.
Date Public
2026-09-08 14:00
Show details on NVD website

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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.