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-2026-34452 (GCVE-0-2026-34452)
Vulnerability from cvelistv5 – Published: 2026-03-31 21:32 – Updated: 2026-04-03 16:08
VLAI
Title
Claude SDK for Python: Memory Tool Path Validation Race Condition Allows Sandbox Escape
Summary
The Claude SDK for Python provides access to the Claude API from Python applications. From version 0.86.0 to before version 0.87.0, the async local filesystem memory tool in the Anthropic Python SDK validated that model-supplied paths resolved inside the sandboxed memory directory, but then returned the unresolved path for subsequent file operations. A local attacker able to write to the memory directory could retarget a symlink between validation and use, causing reads or writes to escape the sandbox. The synchronous memory tool implementation was not affected. This issue has been patched in version 0.87.0.
Severity
CWE
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://github.com/anthropics/anthropic-sdk-pytho… | x_refsource_CONFIRM |
| https://github.com/anthropics/anthropic-sdk-pytho… | x_refsource_MISC |
| https://github.com/anthropics/anthropic-sdk-pytho… | x_refsource_MISC |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| anthropics | anthropic-sdk-python |
Affected:
>= 0.86.0, < 0.87.0
|
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CVE-2026-34596 (GCVE-0-2026-34596)
Vulnerability from cvelistv5 – Published: 2026-05-05 19:34 – Updated: 2026-05-07 03:55
VLAI
Title
Sandboxie-Plus local privilege escalation via TOCTOU race condition in UpdUtil addon installation
Summary
Sandboxie-Plus is an open source sandbox-based isolation software for Windows. In versions 1.17.2 and earlier, a Time-of-Check-to-Time-of-Use (TOCTOU) race condition exists during addon installation. When a user installs an addon through the SandMan interface, UpdUtil.exe is spawned as SYSTEM by SbieSvc but stages files in the user-writable %TEMP%\sandboxie-updater directory. After UpdUtil verifies file hashes against the signed addon manifest, install.bat extracts files.cab and executes config.exe from its contents. Between hash verification and extraction, an unprivileged user can replace files.cab with a crafted cabinet containing a malicious executable, which is then run as SYSTEM. No UAC prompt is required.
This issue has been fixed in version 1.17.3.
Severity
CWE
- CWE-367 - Time-of-check Time-of-use (TOCTOU) Race Condition
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://github.com/sandboxie-plus/Sandboxie/secur… | x_refsource_CONFIRM |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| sandboxie-plus | Sandboxie |
Affected:
< 1.17.3
|
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CVE-2026-35345 (GCVE-0-2026-35345)
Vulnerability from cvelistv5 – Published: 2026-04-22 16:07 – Updated: 2026-04-22 18:13
VLAI
Title
uutils coreutils tail Privileged Information Disclosure via Symlink Replacement Race
Summary
A vulnerability in the tail utility of uutils coreutils allows for the exfiltration of sensitive file contents when using the --follow=name option. Unlike GNU tail, the uutils implementation continues to monitor a path after it has been replaced by a symbolic link, subsequently outputting the contents of the link's target. In environments where a privileged user (e.g., root) monitors a log directory, a local attacker with write access to that directory can replace a log file with a symlink to a sensitive system file (such as /etc/shadow), causing tail to disclose the contents of the sensitive file.
Severity
5.3 (Medium)
CWE
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://github.com/uutils/coreutils/issues/10328 | issue-tracking |
Credits
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CVE-2026-35352 (GCVE-0-2026-35352)
Vulnerability from cvelistv5 – Published: 2026-04-22 16:08 – Updated: 2026-05-04 17:32
VLAI
Title
uutils coreutils mkfifo Privilege Escalation via TOCTOU Race Condition
Summary
A Time-of-Check to Time-of-Use (TOCTOU) race condition exists in the mkfifo utility of uutils coreutils. The utility creates a FIFO and then performs a path-based chmod to set permissions. A local attacker with write access to the parent directory can swap the newly created FIFO for a symbolic link between these two operations. This redirects the chmod call to an arbitrary file, potentially enabling privilege escalation if the utility is run with elevated privileges.
Severity
CWE
- CWE-367 - Time-of-Check Time-of-Use (TOCTOU) Race Condition
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://github.com/uutils/coreutils/issues/10020 | issue-tracking |
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CVE-2026-35353 (GCVE-0-2026-35353)
Vulnerability from cvelistv5 – Published: 2026-04-22 16:08 – Updated: 2026-04-22 17:49
VLAI
Title
uutils coreutils mkdir Permission Exposure Race Condition with -m
Summary
The mkdir utility in uutils coreutils incorrectly applies permissions when using the -m flag by creating a directory with umask-derived permissions (typically 0755) before subsequently changing them to the requested mode via a separate chmod system call. In multi-user environments, this introduces a brief window where a directory intended to be private is accessible to other users, potentially leading to unauthorized data access.
Severity
CWE
- CWE-367 - Time-of-Check Time-of-Use (TOCTOU) Race Condition
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://github.com/uutils/coreutils/pull/10036 | issue-trackingpatch |
| https://github.com/uutils/coreutils/releases/tag/0.6.0 | vendor-advisory |
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CVE-2026-35354 (GCVE-0-2026-35354)
Vulnerability from cvelistv5 – Published: 2026-04-22 16:08 – Updated: 2026-04-22 18:02
VLAI
Title
uutils coreutils mv Security Xattr TOCTOU Race in Cross-Device
Summary
A Time-of-Check to Time-of-Use (TOCTOU) vulnerability exists in the mv utility of uutils coreutils during cross-device moves. The extended attribute (xattr) preservation logic uses multiple path-based system calls that perform fresh path-to-inode lookups for each operation. A local attacker with write access to the directory can exploit this race to swap files between calls, causing the destination file to receive an inconsistent mix of security xattrs, such as SELinux labels or file capabilities.
Severity
4.7 (Medium)
CWE
- CWE-367 - Time-of-Check Time-of-Use (TOCTOU) Race Condition
Assigner
References
1 reference
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CVE-2026-35355 (GCVE-0-2026-35355)
Vulnerability from cvelistv5 – Published: 2026-04-22 16:08 – Updated: 2026-04-22 18:01
VLAI
Title
uutils coreutils install Arbitrary File Overwrite via Symlink TOCTOU Race
Summary
The install utility in uutils coreutils is vulnerable to a Time-of-Check to Time-of-Use (TOCTOU) race condition during file installation. The implementation unlinks an existing destination file and then recreates it using a path-based operation without the O_EXCL flag. A local attacker can exploit the window between the unlink and the subsequent creation to swap the path with a symbolic link, allowing them to redirect privileged writes to overwrite arbitrary system files.
Severity
6.3 (Medium)
CWE
- CWE-367 - Time-of-Check Time-of-Use (TOCTOU) Race Condition
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://github.com/uutils/coreutils/pull/10067 | issue-trackingpatch |
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CVE-2026-35356 (GCVE-0-2026-35356)
Vulnerability from cvelistv5 – Published: 2026-04-22 16:08 – Updated: 2026-04-22 18:00
VLAI
Title
uutils coreutils install Arbitrary File Overwrite with -D via Path Component Symlink Race
Summary
A Time-of-Check to Time-of-Use (TOCTOU) vulnerability exists in the install utility of uutils coreutils when using the -D flag. The command creates parent directories and subsequently performs a second path resolution to create the target file, neither of which is anchored to a directory file descriptor. An attacker with concurrent write access can replace a path component with a symbolic link between these operations, redirecting the privileged write to an arbitrary file system location.
Severity
6.3 (Medium)
CWE
- CWE-367 - Time-of-Check Time-of-Use (TOCTOU) Race Condition
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://github.com/uutils/coreutils/pull/10140 | patchissue-tracking |
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CVE-2026-35357 (GCVE-0-2026-35357)
Vulnerability from cvelistv5 – Published: 2026-04-22 16:08 – Updated: 2026-04-22 17:58
VLAI
Title
uutils coreutils cp Information Disclosure via Permission Handling Race
Summary
The cp utility in uutils coreutils is vulnerable to an information disclosure race condition. Destination files are initially created with umask-derived permissions (e.g., 0644) before being restricted to their final mode (e.g., 0600) later in the process. A local attacker can race to open the file during this window; once obtained, the file descriptor remains valid and readable even after the permissions are tightened, exposing sensitive or private file contents.
Severity
4.7 (Medium)
CWE
- CWE-367 - Time-of-Check Time-of-Use (TOCTOU) Race Condition
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://github.com/uutils/coreutils/issues/10011 | issue-tracking |
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CVE-2026-35359 (GCVE-0-2026-35359)
Vulnerability from cvelistv5 – Published: 2026-04-22 16:08 – Updated: 2026-04-22 17:50
VLAI
Title
uutils coreutils cp Information Disclosure via Time-of-Check to Time-of-Use Symlink Swap
Summary
A Time-of-Check to Time-of-Use (TOCTOU) vulnerability in the cp utility of uutils coreutils allows an attacker to bypass no-dereference intent. The utility checks if a source path is a symbolic link using path-based metadata but subsequently opens it without the O_NOFOLLOW flag. An attacker with concurrent write access can swap a regular file for a symbolic link during this window, causing a privileged cp process to copy the contents of arbitrary sensitive files into a destination controlled by the attacker.
Severity
4.7 (Medium)
CWE
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://github.com/uutils/coreutils/issues/10017 | issue-tracking |
Credits
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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.