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  2. 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.

[CVE-2026-2139] [Modified: 10-02-2026] [Analyzed] [V3.1 S8.8:HIGH] A vulnerability was determined in Tenda TX9 up to 22.03.02.10_multi. Affected by this vulnerability is the function sub_432580 of the file /goform/fast_setting_wifi_set. This manipulation of the argument ssid causes buffer overflow. The attack may be initiated remotely. The exploit has been publicly disclosed and may be utilized.

[CVE-2026-2140] [Modified: 10-02-2026] [Analyzed] [V3.1 S8.8:HIGH] A vulnerability was identified in Tenda TX9 up to 22.03.02.10_multi. Affected by this issue is the function sub_4223E0 of the file /goform/setMacFilterCfg. Such manipulation of the argument deviceList leads to buffer overflow. The attack may be launched remotely. The exploit is publicly available and might be used.

[CVE-2026-2141] [Modified: 29-04-2026] [Analyzed] [V3.1 S6.3:MEDIUM] A security flaw has been discovered in WuKongOpenSource WukongCRM up to 11.3.3. This affects an unknown part of the file gateway/src/main/java/com/kakarote/gateway/service/impl/PermissionServiceImpl.java of the component URL Handler. Performing a manipulation results in improper authorization. Remote exploitation of the attack is possible. The exploit has been released to the public and may be used for attacks. The vendor was contacted early about this disclosure but did not respond in any way.

[CVE-2026-2142] [Modified: 10-02-2026] [Analyzed] [V3.1 S7.2:HIGH] A weakness has been identified in D-Link DIR-823X 250416. This vulnerability affects the function sub_420688 of the file /goform/set_qos. Executing a manipulation can lead to os command injection. The attack can be executed remotely. The exploit has been made available to the public and could be used for attacks.

[CVE-2026-2143] [Modified: 10-02-2026] [Analyzed] [V3.1 S7.2:HIGH] A security vulnerability has been detected in D-Link DIR-823X 250416. This issue affects some unknown processing of the file /goform/set_ddns of the component DDNS Service. The manipulation of the argument ddnsType/ddnsDomainName/ddnsUserName/ddnsPwd leads to os command injection. The attack is possible to be carried out remotely. The exploit has been disclosed publicly and may be used.

[CVE-2026-2145] [Modified: 29-04-2026] [Analyzed] [V3.1 S3.5:LOW] A vulnerability was identified in cym1102 nginxWebUI up to 4.3.7. The impacted element is an unknown function of the file /adminPage/conf/check of the component Web Management Interface. Such manipulation of the argument nginxDir leads to cross site scripting. The attack can be executed remotely. The exploit is publicly available and might be used. The project was informed of the problem early through an issue report but has not responded yet.

[CVE-2026-2146] [Modified: 29-04-2026] [Analyzed] [V3.1 S6.3:MEDIUM] A security flaw has been discovered in guchengwuyue yshopmall up to 1.9.1. This affects the function updateAvatar of the file /api/users/updateAvatar of the component co.yixiang.utils.FileUtil. Performing a manipulation of the argument File results in unrestricted upload. The attack is possible to be carried out remotely. The exploit has been released to the public and may be used for attacks. The project was informed of the problem early through an issue report but has not responded yet.

[CVE-2026-2147] [Modified: 10-02-2026] [Analyzed] [V3.1 S5.3:MEDIUM] A weakness has been identified in Tenda AC21 16.03.08.16. This impacts an unknown function of the file /cgi-bin/DownloadLog of the component Web Management Interface. Executing a manipulation can lead to information disclosure. The attack may be performed from remote. The exploit has been made available to the public and could be used for attacks.

[CVE-2026-2148] [Modified: 10-02-2026] [Analyzed] [V3.1 S5.3:MEDIUM] A security vulnerability has been detected in Tenda AC21 16.03.08.16. Affected is an unknown function of the file /cgi-bin/DownloadFlash of the component Web Management Interface. The manipulation leads to information disclosure. It is possible to initiate the attack remotely. The exploit has been disclosed publicly and may be used.

[CVE-2026-2149] [Modified: 29-04-2026] [Analyzed] [V3.1 S4.3:MEDIUM] A vulnerability was detected in SourceCodester/Patrick Mvuma Patients Waiting Area Queue Management System 1.0. Affected by this vulnerability is an unknown functionality of the file /appointments.php. The manipulation of the argument patient_id results in cross site scripting. It is possible to launch the attack remotely. The exploit is now public and may be used.

[CVE-2026-2150] [Modified: 29-04-2026] [Analyzed] [V3.1 S4.3:MEDIUM] A flaw has been found in SourceCodester/Patrick Mvuma Patients Waiting Area Queue Management System 1.0. Affected by this issue is some unknown functionality of the file /checkin.php. This manipulation of the argument patient_id causes cross site scripting. The attack can be initiated remotely. The exploit has been published and may be used.

[CVE-2026-2151] [Modified: 11-02-2026] [Analyzed] [V3.1 S7.2:HIGH] A vulnerability has been found in D-Link DIR-615 4.10. This affects an unknown part of the file adv_firewall.php of the component DMZ Host Feature. Such manipulation of the argument dmz_ipaddr  leads to os command injection. The attack can be launched remotely. The exploit has been disclosed to the public and may be used. This vulnerability only affects products that are no longer supported by the maintainer.

[CVE-2026-2152] [Modified: 11-02-2026] [Analyzed] [V3.1 S7.2:HIGH] A vulnerability was found in D-Link DIR-615 4.10. This vulnerability affects unknown code of the file adv_routing.php of the component Web Configuration Interface. Performing a manipulation of the argument dest_ip/ submask/ gw results in os command injection. The attack may be initiated remotely. The exploit has been made public and could be used. This vulnerability only affects products that are no longer supported by the maintainer.

[CVE-2026-2153] [Modified: 29-04-2026] [Analyzed] [V3.1 S4.3:MEDIUM] A vulnerability was determined in mwielgoszewski doorman up to 0.6. This issue affects the function is_safe_url of the file doorman/users/views.py. Executing a manipulation of the argument Next can lead to open redirect. The attack may be launched remotely. The exploit has been publicly disclosed and may be utilized.

[CVE-2026-2154] [Modified: 29-04-2026] [Analyzed] [V3.1 S4.3:MEDIUM] A vulnerability was identified in SourceCodester/Patrick Mvuma Patients Waiting Area Queue Management System 1.0. Impacted is an unknown function of the file /registration.php of the component Patient Registration Module. The manipulation of the argument First Name leads to cross site scripting. Remote exploitation of the attack is possible. The exploit is publicly available and might be used.

[CVE-2026-2155] [Modified: 11-02-2026] [Analyzed] [V3.1 S7.2:HIGH] A security flaw has been discovered in D-Link DIR-823X 250416. The affected element is the function sub_4208A0 of the file /goform/set_dmz of the component Configuration Handler. The manipulation of the argument dmz_host/dmz_enable results in os command injection. The attack can be executed remotely. The exploit has been released to the public and may be used for attacks.

[CVE-2026-2156] [Modified: 29-04-2026] [Analyzed] [V3.1 S2.4:LOW] A weakness has been identified in code-projects Online Student Management System 1.0. The impacted element is an unknown function of the file /admin/announcement/index.php?view=add of the component Announcement Management Module. This manipulation causes cross site scripting. The attack is possible to be carried out remotely. The exploit has been made available to the public and could be used for attacks.

[CVE-2026-2157] [Modified: 11-02-2026] [Analyzed] [V3.1 S7.2:HIGH] A security vulnerability has been detected in D-Link DIR-823X 250416. This affects the function sub_4175CC of the file /goform/set_static_route_table. Such manipulation of the argument interface/destip/netmask/gateway/metric leads to os command injection. The attack may be performed from remote. The exploit has been disclosed publicly and may be used.

[CVE-2026-2158] [Modified: 11-02-2026] [Analyzed] [V3.1 S7.3:HIGH] A vulnerability was detected in code-projects Student Web Portal 1.0. This impacts an unknown function of the file /check_user.php. Performing a manipulation of the argument Username results in sql injection. It is possible to initiate the attack remotely.

[CVE-2026-2159] [Modified: 29-04-2026] [Analyzed] [V3.1 S4.3:MEDIUM] A flaw has been found in SourceCodester Simple Responsive Tourism Website 1.0. Affected is an unknown function of the file /tourism/classes/Master.php?f=register of the component Registration. Executing a manipulation of the argument firstname/lastname/username can lead to cross site scripting. It is possible to launch the attack remotely. The exploit has been published and may be used.