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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 - 14:09:41 up 279 days, 22:41, 7 users, load average: 0.00, 0.00, 0.00

[26/06/2026 13:00] Em conjunto, ministros do STF votam para liberar parte do pagamento de penduricalhos - G1

[26/06/2026 09:37] Sobe para mais de 580 o número de mortos na Venezuela após terremotos - CNN Brasil

[26/06/2026 04:43] Vídeo de Michelle é novo revés para a campanha de Flávio Bolsonaro, diz Financial Times - BBC

[26/06/2026 10:34] Marco Rubio mantém tarifas e ignora apelo de Flávio Bolsonaro - Poder360

[26/06/2026 10:14] Avião de pequeno porte bate no arranha-céu mais alto de Pequim - G1

[25/06/2026 20:47] Espriella promete a Lula cooperação ‘além das ideologias’ entre Brasil e Colômbia - CartaCapital

[26/06/2026 11:39] Caso do filme 'Dark Horse' pode levar PF a abrir até 3 inquéritos nos próximos dias - G1

[26/06/2026 07:35] Censo Escolar: Brasil reduz índices de reprovação, abandono e atraso - Agência Brasil

[26/06/2026 08:56] Brasil x Japão: Servidores federais serão liberados às 11h na segunda (29) - Correio Braziliense

[26/06/2026 08:41] PF encontra novos indícios de ocultação de patrimônio ligados a Vorcaro - CNN Brasil

[CVE-2026-2677] [Modified: 17-06-2026] [Analyzed] [V3.1 S6.1:MEDIUM] Reflected Cross-Site Scripting (XSS) on the A3factura web platform, in parameter 'name', in 'a3factura-app.wolterskluwer.es/#/incomes/representatives-management' endpoint, which could allow an attacker to execute arbitrary code in the victim's browser.

[CVE-2026-2678] [Modified: 17-06-2026] [Analyzed] [V3.1 S6.1:MEDIUM] Reflected Cross-Site Scripting (XSS) on the A3factura web platform, in parameter 'name', parameter 'name', in 'a3factura-app.wolterskluwer.es/#/incomes/customers' endpoint, which could allow an attacker to execute arbitrary code in the victim's browser.

[CVE-2026-2679] [Modified: 17-06-2026] [Analyzed] [V3.1 S6.1:MEDIUM] Reflected Cross-Site Scripting (XSS) on the A3factura web platform, in parameter 'customerName', in 'a3factura-app.wolterskluwer.es/#/incomes/salesInvoices' endpoint, which could allow an attacker to execute arbitrary code in the victim's browser.

[CVE-2026-2680] [Modified: 17-06-2026] [Analyzed] [V3.1 S6.1:MEDIUM] Reflected Cross-Site Scripting (XSS) on the A3factura web platform, in parameter 'customerVATNumber', in 'a3factura-app.wolterskluwer.es/#/incomes/salesDeliveryNotes' endpoint, which could allow an attacker to execute arbitrary code in the victim's browser.

[CVE-2026-26077] [Modified: 17-06-2026] [Analyzed] [V3.1 S6.5:MEDIUM] Discourse is an open source discussion platform. Prior to versions 2025.12.2, 2026.1.1, and 2026.2.0, several webhook endpoints (SendGrid, Mailjet, Mandrill, Postmark, SparkPost) in the `WebhooksController` accepted requests without a valid authentication token when no token was configured. This allowed unauthenticated attackers to forge webhook payloads and artificially inflate user bounce scores, potentially causing legitimate user emails to be disabled. The Mailpace endpoint had no token validation at all. Starting in versions 2025.12.2, 2026.1.1, and 2026.2.0, all webhook endpoints reject requests with a 406 response when no authentication token is configured. As a workaround, ensure that webhook authentication tokens are configured for all email provider integrations in site settings (e.g., `sendgrid_verification_key`, `mailjet_webhook_token`, `postmark_webhook_token`, `sparkpost_webhook_token`). There's no current workaround for mailpace before getting this fix.

[CVE-2026-26078] [Modified: 17-06-2026] [Analyzed] [V3.1 S7.5:HIGH] Discourse is an open source discussion platform. Prior to versions 2025.12.2, 2026.1.1, and 2026.2.0, when the `patreon_webhook_secret` site setting is blank, an attacker can forge valid webhook signatures by computing an HMAC-MD5 with an empty string as the key. Since the request body is known to the sender, the attacker can produce a matching signature and send arbitrary webhook payloads. This allows unauthorized creation, modification, or deletion of Patreon pledge data and triggering patron-to-group synchronization. This vulnerability is patched in versions 2025.12.2, 2026.1.1, and 2026.2.0. The fix rejects webhook requests when the webhook secret is not configured, preventing signature forgery with an empty key. As a workaround, configure the `patreon_webhook_secret` site setting with a strong, non-empty secret value. When the secret is non-empty, an attacker cannot forge valid signatures without knowing the secret.

[CVE-2026-26207] [Modified: 17-06-2026] [Analyzed] [V3.1 S5.4:MEDIUM] Discourse is an open source discussion platform. Prior to versions 2025.12.2, 2026.1.1, and 2026.2.0, `discourse-policy` plugin allows any authenticated user to interact with policies on posts they do not have permission to view. The `PolicyController` loads posts by ID without verifying the current user's access, enabling policy group members to accept/unaccept policies on posts in private categories or PMs they cannot see and any authenticated user to enumerate which post IDs have policies attached via differentiated error responses (information disclosure). The issue is patched in versions 2025.12.2, 2026.1.1, and 2026.2.0 by adding a `guardian.can_see?(@post)` check in the `set_post` before_action, ensuring post visibility is verified before any policy action is processed. As a workaround, disabling the discourse-policy plugin (`policy_enabled = false`) eliminates the vulnerability. There is no other workaround without upgrading.

[CVE-2026-26265] [Modified: 17-06-2026] [Analyzed] [V3.1 S7.5:HIGH] Discourse is an open source discussion platform. Prior to versions 2025.12.2, 2026.1.1, and 2026.2.0, an IDOR vulnerability in the directory items endpoint allows any user, including anonymous users, to retrieve private user field values for all users in the directory. The `user_field_ids` parameter in `DirectoryItemsController#index` accepts arbitrary user field IDs without authorization checks, bypassing the visibility restrictions (`show_on_profile` / `show_on_user_card`) that are enforced elsewhere (e.g., `UserCardSerializer` via `Guardian#allowed_user_field_ids`). An attacker can request `GET /directory_items.json?period=all&user_field_ids=<id>` with any private field ID and receive that field's value for every user in the directory response. This enables bulk exfiltration of private user data such as phone numbers, addresses, or other sensitive custom fields that admins have explicitly configured as non-public. The issue is patched in versions 2025.12.2, 2026.1.1, and 2026.2.0 by filtering `user_field_ids` against `UserField.public_fields` for non-staff users before building the custom field map. As a workaround, site administrators can remove sensitive data from private user fields, or disable the user directory via the `enable_user_directory` site setting.

[CVE-2026-26682] [Modified: 17-06-2026] [Analyzed] [V3.1 S7.8:HIGH] An issue in fastCMS before v.0.1.6 allows a local attacker to execute arbitrary code via the PluginController.java component

[CVE-2026-26932] [Modified: 17-06-2026] [Analyzed] [V3.1 S5.7:MEDIUM] Improper Validation of Array Index (CWE-129) in the PostgreSQL protocol parser in Packetbeat can lead Denial of Service via Input Data Manipulation (CAPEC-153). An attacker can send a specially crafted packet causing a Go runtime panic that terminates the Packetbeat process. This vulnerability requires the pgsql protocol to be explicitly enabled and configured to monitor traffic on the targeted port.

[CVE-2026-26934] [Modified: 17-06-2026] [Analyzed] [V3.1 S6.5:MEDIUM] Improper Validation of Specified Quantity in Input (CWE-1284) in Kibana can allow an authenticated attacker with view-only privileges to cause a Denial of Service via Input Data Manipulation (CAPEC-153). An attacker can send a specially crafted, malformed payload causing excessive resource consumption and resulting in Kibana becoming unresponsive or crashing.

[CVE-2026-26935] [Modified: 17-06-2026] [Analyzed] [V3.1 S6.5:MEDIUM] Improper Input Validation (CWE-20) in the internal Content Connectors search endpoint in Kibana can lead Denial of Service via Input Data Manipulation (CAPEC-153)

[CVE-2026-26936] [Modified: 17-06-2026] [Analyzed] [V3.1 S4.9:MEDIUM] Inefficient Regular Expression Complexity (CWE-1333) in the AI Inference Anonymization Engine in Kibana can lead Denial of Service via Regular Expression Exponential Blowup (CAPEC-492).

[CVE-2026-26937] [Modified: 17-06-2026] [Analyzed] [V3.1 S6.5:MEDIUM] Uncontrolled Resource Consumption (CWE-400) in the Timelion component in Kibana can lead Denial of Service via Input Data Manipulation (CAPEC-153)

[CVE-2026-26938] [Modified: 17-06-2026] [Analyzed] [V3.1 S8.6:HIGH] Improper Neutralization of Special Elements Used in a Template Engine (CWE-1336) exists in Workflows in Kibana which could allow an attacker to read arbitrary files from the Kibana server filesystem, and perform Server-Side Request Forgery (SSRF) via Code Injection (CAPEC-242). This requires an authenticated user who has the workflowsManagement:executeWorkflow privilege.

[CVE-2026-26973] [Modified: 17-06-2026] [Analyzed] [V3.1 S4.3:MEDIUM] Discourse is an open source discussion platform. Versions prior to 2025.12.2, 2026.1.1, and 2026.2.0 have an IDOR (Insecure Direct Object Reference) in `ReviewableNotesController`. When `enable_category_group_moderation` is enabled, a user belonging to a category moderation group can create or delete their own notes on **any** reviewable in the system, including reviewables in categories they do not moderate. The controller used an unscoped `Reviewable.find` and the `ensure_can_see` guard only checked whether the user could access the review queue in general, not whether they could access the specific reviewable. Only instances with `enable_category_group_moderation` enabled are affected. Staff users (admins/moderators) are not impacted as they already have access to all reviewables. The issue is patched in versions 2025.12.2, 2026.1.1, and 2026.2.0 by scoping the reviewable lookup through `Reviewable.viewable_by(current_user)`. As a workaround, disable the `enable_category_group_moderation` site setting. This removes the attack surface as only staff users will have access to the review queue.

[CVE-2026-26979] [Modified: 17-06-2026] [Analyzed] [V3.1 S2.7:LOW] Discourse is an open source discussion platform. Prior to versions 2025.12.2, 2026.1.1, and 2026.2.0, TL4 users are able to close, archive and pin topics in private categories they don't have access to. Versions 2025.12.2, 2026.1.1, and 2026.2.0 patch the issue. No known workarounds are available.

[CVE-2026-27510] [Modified: 17-06-2026] [Analyzed] [V3.1 S9.6:CRITICAL] Unitree Go2 firmware versions 1.1.7 through 1.1.11, when used with the Unitree Go2 Android application (com.unitree.doggo2), are vulnerable to remote code execution due to missing integrity protection and validation of user-created programmes. The Android application stores programs in a local SQLite database (unitree_go2.db, table dog_programme) and transmits the programme_text content, including the pyCode field, to the robot. The robot's actuator_manager.py executes the supplied Python as root without integrity verification or content validation. An attacker with local access to the Android device can tamper with the stored programme record to inject arbitrary Python that executes when the user triggers the program via a controller keybinding, and the malicious binding persists across reboots. Additionally, a malicious program shared through the application's community marketplace can result in arbitrary code execution on any robot that imports and runs it.

[CVE-2026-22205] [Modified: 17-06-2026] [Analyzed] [V3.1 S7.5:HIGH] SPIP versions prior to 4.4.10 contain an authentication bypass vulnerability caused by PHP type juggling that allows unauthenticated attackers to access protected information. Attackers can exploit loose type comparisons in authentication logic to bypass login verification and retrieve sensitive internal data.

[CVE-2026-22206] [Modified: 17-06-2026] [Analyzed] [V3.1 S8.8:HIGH] SPIP versions prior to 4.4.10 contain a SQL injection vulnerability that allows authenticated low-privilege users to execute arbitrary SQL queries by manipulating union-based injection techniques. Attackers can exploit this SQL injection flaw combined with PHP tag processing to achieve remote code execution on the server.