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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-2026-2877] [Modified: 17-06-2026] [Analyzed] [V3.1 S8.8:HIGH] A vulnerability has been found in Tenda A18 15.13.07.13. This affects the function strcpy of the file /goform/WifiExtraSet of the component Httpd Service. The manipulation of the argument wpapsk_crypto5g leads to stack-based buffer overflow. It is possible to initiate the attack remotely. The exploit has been disclosed to the public and may be used.

[CVE-2026-2881] [Modified: 17-06-2026] [Analyzed] [V3.1 S8.8:HIGH] A vulnerability has been found in D-Link DWR-M960 1.01.07. This vulnerability affects the function sub_425FF8 of the file /boafrm/formFirewallAdv of the component Advanced Firewall Configuration Endpoint. Such manipulation of the argument submit-url leads to stack-based buffer overflow. The attack may be launched remotely. The exploit has been disclosed to the public and may be used.

[CVE-2026-2882] [Modified: 17-06-2026] [Analyzed] [V3.1 S8.8:HIGH] A vulnerability was found in D-Link DWR-M960 1.01.07. This issue affects the function sub_46385C of the file /boafrm/formDosCfg. Performing a manipulation of the argument submit-url results in stack-based buffer overflow. Remote exploitation of the attack is possible. The exploit has been made public and could be used.

[CVE-2026-2883] [Modified: 17-06-2026] [Analyzed] [V3.1 S8.8:HIGH] A vulnerability was determined in D-Link DWR-M960 1.01.07. Impacted is the function sub_427D74 of the file /boafrm/formIpQoS. Executing a manipulation of the argument submit-url can lead to stack-based buffer overflow. The attack can be executed remotely. The exploit has been publicly disclosed and may be utilized.

[CVE-2026-2884] [Modified: 17-06-2026] [Analyzed] [V3.1 S8.8:HIGH] A vulnerability was identified in D-Link DWR-M960 1.01.07. The affected element is the function sub_41914C of the file /boafrm/formWanConfigSetup of the component WAN Interface Setting Handler. The manipulation of the argument submit-url leads to stack-based buffer overflow. The attack is possible to be carried out remotely. The exploit is publicly available and might be used.

[CVE-2026-2885] [Modified: 17-06-2026] [Analyzed] [V3.1 S8.8:HIGH] A security flaw has been discovered in D-Link DWR-M960 1.01.07. The impacted element is the function sub_469104 of the file /boafrm/formIpv6Setup. The manipulation of the argument submit-url results in stack-based buffer overflow. The attack may be performed from remote. The exploit has been released to the public and may be used for attacks.

[CVE-2026-2886] [Modified: 17-06-2026] [Analyzed] [V3.1 S8.8:HIGH] A weakness has been identified in Tenda A21 1.0.0.0. This affects the function set_device_name of the file /goform/SetOnlineDevName. This manipulation of the argument devName causes stack-based buffer overflow. It is possible to initiate the attack remotely. The exploit has been made available to the public and could be used for attacks.

[CVE-2026-2887] [Modified: 17-06-2026] [Analyzed] [V3.1 S3.3:LOW] A security vulnerability has been detected in aardappel lobster up to 2025.4. This impacts the function lobster::TypeName in the library dev/src/lobster/idents.h. Such manipulation leads to uncontrolled recursion. The attack can only be performed from a local environment. The exploit has been disclosed publicly and may be used. Upgrading to version 2026.1 will fix this issue. The name of the patch is 8ba49f98ccfc9734ef352146806433a41d9f9aa6. It is advisable to upgrade the affected component.

[CVE-2026-2894] [Modified: 17-06-2026] [Analyzed] [V3.1 S5.3:MEDIUM] A vulnerability was identified in funadmin up to 7.1.0-rc4. Affected by this vulnerability is the function getMember of the file app/frontend/view/login/forget.html. Such manipulation leads to information disclosure. The attack may be launched remotely. The exploit is publicly available and might be used. The vendor was contacted early about this disclosure but did not respond in any way.

[CVE-2026-2895] [Modified: 17-06-2026] [Analyzed] [V3.1 S3.7:LOW] A security flaw has been discovered in funadmin up to 7.1.0-rc4. Affected by this issue is the function repass of the file app/frontend/controller/Member.php. Performing a manipulation of the argument forget_code/vercode results in weak password recovery. Remote exploitation of the attack is possible. The attack's complexity is rated as high. The exploitation is known to be difficult. 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-2026-2896] [Modified: 17-06-2026] [Analyzed] [V3.1 S7.3:HIGH] A weakness has been identified in funadmin up to 7.1.0-rc4. This affects the function setConfig of the file app/backend/controller/Ajax.php of the component Configuration Handler. Executing a manipulation can lead to improper authorization. The attack can be executed remotely. The exploit has been made available to the public and could be used for attacks. The vendor was contacted early about this disclosure but did not respond in any way.

[CVE-2026-2897] [Modified: 17-06-2026] [Analyzed] [V3.1 S2.4:LOW] A security vulnerability has been detected in funadmin up to 7.1.0-rc4. This vulnerability affects unknown code of the file app/backend/view/index/index.html of the component Backend Interface. The manipulation of the argument Value leads to cross site scripting. The attack is possible to be carried out remotely. The exploit has been disclosed publicly and may be used. The vendor was contacted early about this disclosure but did not respond in any way.

[CVE-2026-2898] [Modified: 17-06-2026] [Analyzed] [V3.1 S5.5:MEDIUM] A vulnerability was detected in funadmin up to 7.1.0-rc4. This issue affects the function getMember of the file app/common/service/AuthCloudService.php of the component Backend Endpoint. The manipulation of the argument cloud_account results in deserialization. The attack may be performed from remote. The exploit is now public and may be used. The vendor was contacted early about this disclosure but did not respond in any way.

[CVE-2026-2904] [Modified: 17-06-2026] [Analyzed] [V3.1 S8.8:HIGH] A vulnerability was determined in UTT HiPER 810G 1.7.7-171114. This affects the function strcpy of the file /goform/ConfigExceptAli. Executing a manipulation can lead to buffer overflow. The attack can be launched remotely. The exploit has been publicly disclosed and may be utilized.

[CVE-2026-2905] [Modified: 17-06-2026] [Analyzed] [V3.1 S8.8:HIGH] A vulnerability was identified in Tenda HG9 300001138. This impacts an unknown function of the file /boaform/formWlanSetup of the component Wireless Configuration Endpoint. The manipulation of the argument ssid leads to stack-based buffer overflow. The attack may be initiated remotely. The exploit is publicly available and might be used.

[CVE-2026-2906] [Modified: 17-06-2026] [Analyzed] [V3.1 S8.8:HIGH] A security flaw has been discovered in Tenda HG9 300001138. Affected is an unknown function of the file /boaform/formSamba of the component Samba Configuration Endpoint. The manipulation of the argument sambaCap results in stack-based buffer overflow. The attack may be launched remotely. The exploit has been released to the public and may be used for attacks.

[CVE-2026-2907] [Modified: 17-06-2026] [Analyzed] [V3.1 S8.8:HIGH] A weakness has been identified in Tenda HG9 300001138. Affected by this vulnerability is an unknown functionality of the file /boaform/formgponConf of the component GPON Configuration Endpoint. This manipulation of the argument fmgpon_loid/fmgpon_loid_password causes stack-based buffer overflow. Remote exploitation of the attack is possible. The exploit has been made available to the public and could be used for attacks.

[CVE-2026-2908] [Modified: 17-06-2026] [Analyzed] [V3.1 S8.8:HIGH] A security vulnerability has been detected in Tenda HG9 300001138. Affected by this issue is some unknown functionality of the file /boaform/formLoopBack of the component Loopback Detection Configuration Endpoint. Such manipulation of the argument Ethtype leads to stack-based buffer overflow. The attack can be executed remotely. The exploit has been disclosed publicly and may be used.

[CVE-2026-2909] [Modified: 17-06-2026] [Analyzed] [V3.1 S8.8:HIGH] A vulnerability was detected in Tenda HG9 300001138. This affects an unknown part of the file /boaform/formPing of the component Diagnostic Ping Endpoint. Performing a manipulation of the argument pingAddr results in stack-based buffer overflow. The attack is possible to be carried out remotely. The exploit is now public and may be used.

[CVE-2026-2910] [Modified: 17-06-2026] [Analyzed] [V3.1 S8.8:HIGH] A flaw has been found in Tenda HG9 300001138. This vulnerability affects unknown code of the file /boaform/formPing6. Executing a manipulation of the argument pingAddr can lead to stack-based buffer overflow. The attack may be performed from remote. The exploit has been published and may be used.