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After Bitcoin Core 0.14.0 and before Bitcoin Core 29.0, validating a specially-crafted block may cause the node to access previously freed memory.
During validation, necessary data required for checking inputs for each transaction is pre-calculated and cached. For specially crafted invalid blocks, it was possible for this data to be destroyed while it was still being accessed by a background validation thread. An attacker capable of mining a block with sufficient proof-of-work could have exploited this to crash victim nodes. Because of the nature of use-after-free bugs, it is possible that the crash could have been used for remote code execution, though constraints on the input (block) data make this unlikely.
This issue is considered High severity.

Details
By default, script validation for new blocks is dispatched to background threads via a vector of CScriptCheck functors. Each CScriptCheck holds a pointer to a PrecomputedTransactionData object which stores some data needed by each input in the transaction. Because it stores a pointer and not the data itself, care must be taken to ensure that the PrecomputedTransactionData outlives the CScriptCheck.
The script checks lifetime is enforced by an RAII class, CCheckQueueControl. However, the control is intantiated before the precomputed transaction data. Because local objects in C++ are destructed in reverse order of construction, this means the vector of PrecomputedTransactionData is destroyed before the CCheckQueueControl.
This is not an issue when the block is valid, as CCheckQueueControl::Wait() will be called before the function returns and the PrecomputedTransactionData gets destroyed. However, in case of an early return (when a separate check fails) a background script thread may read the precomputed transaction data after it was destroyed. An attacker could exploit this to crash victim nodes at the expense of a valid PoW at tip.

Attribution
Cory Fields (MIT DCI) discovered this vulnerability and responsibly disclosed it in a detailed report containing a proof of concept for reproduction and a proposed mitigation.

Timeline
- 2024-11-02 Cory Fields privately reports the bug
- 2024-11-06 Pieter Wuille pushes a covert fix to already open PR #31112 which works around the issue by removing the early returns
- 2024-12-03 PR #31112 is merged
- 2025-04-12 Bitcoin Core version 29.0 is released with a fix
- 2026-04-19 The last vulnerable Bitcoin Core version (28.x) goes end of life
- 2026-05-05 Public disclosure.

dog - 23:59:03 up 278 days, 8:30, 6 users, load average: 0.00, 0.00, 0.00

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[CVE-2026-25891] [Modified: 17-06-2026] [Analyzed] [V3.1 S7.5:HIGH] Fiber is an Express inspired web framework written in Go. A Path Traversal (CWE-22) vulnerability in Fiber allows a remote attacker to bypass the static middleware sanitizer and read arbitrary files on the server file system on Windows. This affects Fiber v3 through version 3.0.0. This has been patched in Fiber v3 version 3.1.0.

[CVE-2026-25899] [Modified: 17-06-2026] [Analyzed] [V3.1 S7.5:HIGH] Fiber is an Express inspired web framework written in Go. In versions on the v3 branch prior to 3.1.0, the use of the `fiber_flash` cookie can force an unbounded allocation on any server. A crafted 10-character cookie value triggers an attempt to allocate up to 85GB of memory via unvalidated msgpack deserialization. No authentication is required. Every GoFiber v3 endpoint is affected regardless of whether the application uses flash messages. Version 3.1.0 fixes the issue.

[CVE-2026-27117] [Modified: 17-06-2026] [Analyzed] [V3.1 S5.5:MEDIUM] bit7z is a cross-platform C++ static library that allows the compression/extraction of archive files. Prior to version 4.0.11, a path traversal vulnerability ("Zip Slip") exists in bit7z's archive extraction functionality. The library does not adequately validate file paths contained in archive entries, allowing files to be written outside the intended extraction directory through three distinct mechanisms: relative path traversal, absolute path traversal, and symbolic link traversal. An attacker can exploit this by providing a malicious archive to any application that uses bit7z to extract untrusted archives. Successful exploitation results in arbitrary file write with the privileges of the process performing the extraction. This could lead to overwriting of application binaries, configuration files, or other sensitive data. The vulnerability does not directly enable reading of file contents; the confidentiality impact is limited to the calling application's own behavior after extraction. However, applications that subsequently serve or display extracted files may face secondary confidentiality risks from attacker-created symlinks. Fixes have been released in version 4.0.11. If upgrading is not immediately possible, users can mitigate the vulnerability by validating each entry's destination path before writing. Other mitigations include running extraction with least privilege and extracting untrusted archives in a sandboxed directory.

[CVE-2026-27195] [Modified: 17-06-2026] [Analyzed] [V3.1 S7.5:HIGH] Wasmtime is a runtime for WebAssembly. Starting with Wasmtime 39.0.0, the `component-model-async` feature became the default, which brought with it a new implementation of `[Typed]Func::call_async` which made it capable of calling async-typed guest export functions. However, that implementation had a bug leading to a panic under certain circumstances: First, the host embedding calls `[Typed]Func::call_async` on a function exported by a component, polling the returned `Future` once. Second, the component function yields control to the async runtime (e.g. Tokio), e.g. due to a call to host function registered using `LinkerInstance::func_wrap_async` which yields, or due an epoch interruption. Third, the host embedding drops the `Future` after polling it once. This leaves the component instance in a non-reenterable state since the call never had a chance to complete. Fourth, the host embedding calls `[Typed]Func::call_async` again, polling the returned `Future`. Since the component instance cannot be entered at this point, the call traps, but not before allocating a task and thread for the call. Fifth, the host embedding ignores the trap and drops the `Future`. This panics due to the runtime attempting to dispose of the task created above, which panics since the thread has not yet exited. When a host embedder using the affected versions of Wasmtime calls `wasmtime::component::[Typed]Func::call_async` on a guest export and then drops the returned future without waiting for it to resolve, and then does so again with the same component instance, Wasmtime will panic. Embeddings that have the `component-model-async` compile-time feature disabled are unaffected. Wasmtime 40.0.4 and 41.0.4 have been patched to fix this issue. Versions 42.0.0 and later are not affected. If an embedding is not actually using any component-model-async features then disabling the `component-model-async` Cargo feature can work around this issue. This issue can also be worked around by either ensuring every `call_async` future is awaited until it completes or refraining from using the `Store` again after dropping a not-yet-resolved `call_async` future.

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[CVE-2026-27593] [Modified: 17-06-2026] [Analyzed] [V3.1 S9.3:CRITICAL] Statmatic is a Laravel and Git powered content management system (CMS). Prior to versions 6.3.3 and 5.73.10, an attacker may leverage a vulnerability in the password reset feature to capture a user's token and reset the password on their behalf. The attacker must know the email address of a valid account on the site, and the actual user must blindly click the link in their email even though they didn't request the reset. This has been fixed in 6.3.3 and 5.73.10.

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[CVE-2026-27598] [Modified: 17-06-2026] [Analyzed] [V3.1 S6.5:MEDIUM] Dagu is a workflow engine with a built-in Web user interface. In versions up to and including 1.16.7, the `CreateNewDAG` API endpoint (`POST /api/v1/dags`) does not validate the DAG name before passing it to the file store. An authenticated user with DAG write permissions can write arbitrary YAML files anywhere on the filesystem (limited by the process permissions). Since dagu executes DAG files as shell commands, writing a malicious DAG to the DAGs directory of another instance or overwriting config files can lead to remote code execution. Commit e2ed589105d79273e4e6ac8eb31525f765bb3ce4 fixes the issue.

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[CVE-2026-3137] [Modified: 17-06-2026] [Analyzed] [V3.1 S5.3:MEDIUM] A security vulnerability has been detected in CodeAstro Food Ordering System 1.0. This affects an unknown function of the file food_ordering.exe. Such manipulation leads to stack-based buffer overflow. The attack can only be performed from a local environment. The exploit has been disclosed publicly and may be used.

[CVE-2025-67752] [Modified: 17-06-2026] [Analyzed] [V3.1 S8.1:HIGH] OpenEMR is a free and open source electronic health records and medical practice management application. Prior to version 7.0.4, OpenEMR's HTTP client wrapper (`oeHttp`/`oeHttpRequest`) disables SSL/TLS certificate verification by default (`verify: false`), making all external HTTPS connections vulnerable to man-in-the-middle (MITM) attacks. This affects communication with government healthcare APIs and user-configurable external services, potentially exposing Protected Health Information (PHI). Version 7.0.4 fixes the issue.

[CVE-2025-68277] [Modified: 17-06-2026] [Analyzed] [V3.1 S5.0:MEDIUM] OpenEMR is a free and open source electronic health records and medical practice management application. Prior to version 7.0.4, when a link is sent via Secure Messaging, clicking the link opens the website within the OpenEMR/Portal site. This behavior could be exploited for phishing. Version 7.0.4 patches the issue.

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[CVE-2026-24847] [Modified: 17-06-2026] [Analyzed] [V3.1 S6.1:MEDIUM] OpenEMR is a free and open source electronic health records and medical practice management application. Prior to version 8.0.0, the Eye Exam form module allows any authenticated user to be redirected to an arbitrary external URL. This can be exploited for phishing attacks against healthcare providers using OpenEMR. Version 8.0.0 fixes the issue.

[CVE-2026-24849] [Modified: 17-06-2026] [Analyzed] [V3.1 S9.9:CRITICAL] OpenEMR is a free and open source electronic health records and medical practice management application. Prior to version 7.0.4, the `disposeDocument()` method in `EtherFaxActions.php` allows authenticated users to read arbitrary files from the server filesystem. Any authenticated user (regardless of privilege level) can exploit this vulnerability to read sensitive files. Version 7.0.4 patches the issue.

[CVE-2026-24896] [Modified: 17-06-2026] [Analyzed] [V3.1 S6.5:MEDIUM] OpenEMR is a free and open source electronic health records and medical practice management application. Prior to version 8.0.0, a Broken Access Control vulnerability exists in OpenEMR’s edih_main.php endpoint, which allows any authenticated user—including low-privilege roles like Receptionist—to access EDI log files by manipulating the log_select parameter in a GET request. The back-end fails to enforce role-based access control (RBAC), allowing sensitive system logs to be accessed outside the GUI-enforced permission boundaries. Version 8.0.0 fixes the issue.