Heap-Based-Buffer-Overflow — CraftedSignal Threat Feed

Adobe Bridge Heap-based Buffer Overflow Vulnerability (CVE-2026-27312)

hello@craftedsignal.io — Wed, 15 Apr 2026 12:00:00 +0000

Adobe Bridge versions 16.0.2, 15.1.4, and earlier are susceptible to a heap-based buffer overflow vulnerability identified as CVE-2026-27312. The vulnerability can be triggered when a user opens a specially crafted, malicious file within the application. Successful exploitation could allow an attacker to execute arbitrary code within the security context of the currently logged-in user. Given the potential for arbitrary code execution, this vulnerability represents a significant threat, as attackers could leverage it to install malware, exfiltrate sensitive data, or perform other malicious actions on the affected system. The CVSS v3.1 score is 7.8, indicating a high severity. Defenders should prioritize patching or mitigating this vulnerability to prevent potential exploitation.

Attack Chain

Attacker crafts a malicious file designed to trigger the heap-based buffer overflow vulnerability in Adobe Bridge.
The attacker distributes the malicious file to a target user, potentially via email, social media, or other file-sharing mechanisms.
The target user, unaware of the file’s malicious nature, opens the file using a vulnerable version of Adobe Bridge (16.0.2, 15.1.4, or earlier).
Adobe Bridge attempts to process the malicious file, leading to a heap-based buffer overflow during memory allocation or data handling.
The buffer overflow overwrites adjacent memory regions on the heap, potentially including critical program data or executable code.
The attacker gains control of the program’s execution flow by overwriting function pointers or return addresses.
The attacker injects and executes arbitrary code within the context of the current user, bypassing security restrictions.
The attacker performs malicious actions such as installing malware, exfiltrating sensitive data, or establishing persistence on the compromised system.

Impact

Successful exploitation of CVE-2026-27312 allows an attacker to execute arbitrary code within the security context of the user running Adobe Bridge. This can lead to complete system compromise, including data theft, malware installation, and privilege escalation. The vulnerability requires user interaction, limiting the scope of potential attacks to targeted individuals who can be tricked into opening a malicious file. However, if successful, the impact can be severe, as the attacker gains the same privileges as the user, which could include access to sensitive data and network resources.

Recommendation

Apply the security patch provided by Adobe to address CVE-2026-27312, as detailed in the advisory (https://helpx.adobe.com/security/products/bridge/apsb26-39.html).
Educate users about the risks of opening files from untrusted sources to reduce the likelihood of successful exploitation.
Deploy the Sigma rule to detect suspicious process creation events related to Adobe Bridge after the application opens a file.

Adobe Bridge Heap-Based Buffer Overflow Vulnerability (CVE-2026-27311)

hello@craftedsignal.io — Wed, 15 Apr 2026 12:00:00 +0000

Adobe Bridge versions 16.0.2, 15.1.4, and earlier are susceptible to a heap-based buffer overflow vulnerability identified as CVE-2026-27311. Successful exploitation could lead to arbitrary code execution within the security context of the current user. The attack requires user interaction, specifically, the user must open a malicious file crafted to trigger the overflow. This vulnerability poses a significant risk to organizations where Adobe Bridge is used for media management, as attackers could potentially compromise systems and gain unauthorized access to sensitive data.

Attack Chain

Attacker crafts a malicious file designed to exploit the heap-based buffer overflow in Adobe Bridge.
The attacker delivers the malicious file to the victim via email, shared network drive, or other means.
The victim, unknowingly, opens the malicious file using a vulnerable version of Adobe Bridge.
The vulnerable Adobe Bridge application attempts to process the malicious file, leading to a buffer overflow on the heap.
The buffer overflow overwrites adjacent memory regions, potentially including function pointers or other critical data.
The attacker gains control of the program execution flow due to the overwritten memory.
The attacker injects and executes arbitrary code within the context of the Adobe Bridge process.
The attacker uses the code execution to perform malicious activities, such as installing malware, stealing data, or establishing a persistent backdoor.

Impact

Successful exploitation of this vulnerability allows an attacker to execute arbitrary code on a vulnerable system. This could lead to complete system compromise, data theft, or denial of service. Given the widespread use of Adobe Bridge in creative industries, a successful campaign targeting this vulnerability could impact numerous organizations and individuals, potentially resulting in significant financial losses and reputational damage.

Recommendation

Upgrade to a patched version of Adobe Bridge (later than 16.0.2, 15.1.4) to remediate the CVE-2026-27311 vulnerability.
Implement user awareness training to educate users about the risks of opening files from untrusted sources, referencing the description of CVE-2026-27311.
Deploy the Sigma rule “Detect Adobe Bridge Suspicious Child Processes” to identify potential exploitation attempts based on unexpected child processes.
Monitor process creation events for Adobe Bridge spawning unusual child processes, leveraging process_creation logs.

Samsung Escargot Heap-Based Buffer Overflow Vulnerability (CVE-2026-25205)

hello@craftedsignal.io — Mon, 13 Apr 2026 05:16:02 +0000

A heap-based buffer overflow vulnerability, identified as CVE-2026-25205, has been discovered in Samsung Open Source Escargot. This flaw allows an attacker to perform out-of-bounds write operations due to insufficient bounds checking. The specific version affected is identified by commit hash 97e8115ab1110bc502b4b5e4a0c689a71520d335. Successful exploitation of this vulnerability could lead to arbitrary code execution, denial of service, or information disclosure. Given the potential impact and the lack of readily available patches, organizations using affected versions of Escargot should take immediate steps to mitigate this risk.

Attack Chain

The attacker identifies a vulnerable instance of Samsung Open Source Escargot running commit hash 97e8115ab1110bc502b4b5e4a0c689a71520d335.
The attacker crafts a malicious input that triggers the heap-based buffer overflow within Escargot.
The vulnerable function in Escargot attempts to write data beyond the allocated buffer on the heap.
The out-of-bounds write corrupts adjacent memory regions on the heap, potentially overwriting critical data structures or function pointers.
The attacker carefully controls the overwritten data to redirect execution flow to a location of their choosing.
The attacker injects malicious code into the heap and overwrites a function pointer to point to this code.
When the overwritten function pointer is called, the attacker’s code is executed with the privileges of the Escargot process.
The attacker gains control of the system and can perform actions such as installing malware, stealing sensitive data, or disrupting services.

Impact

Successful exploitation of CVE-2026-25205 can lead to a range of negative consequences. An attacker could achieve arbitrary code execution on the affected system, potentially compromising the entire device. This could allow for the installation of persistent backdoors, the theft of sensitive user data, or the complete disruption of service. Given the lack of specific victim data, the impact is assessed as high, especially for systems running Escargot in critical infrastructure or sensitive environments.

Recommendation

Review the pull request at https://github.com/Samsung/escargot/pull/1554 to understand the nature of the vulnerability and potential fixes.
Implement input validation and sanitization techniques to prevent malicious input from triggering the buffer overflow.
Monitor systems running Samsung Open Source Escargot for unexpected crashes or error messages that may indicate exploitation attempts.
Deploy the Sigma rule below to detect potential exploitation attempts based on anomalous process behavior.

Cesanta Mongoose TLS 1.3 Heap-Based Buffer Overflow Vulnerability (CVE-2026-5244)

hello@craftedsignal.io — Thu, 02 Apr 2026 08:16:28 +0000

A heap-based buffer overflow vulnerability, identified as CVE-2026-5244, has been discovered in Cesanta Mongoose versions up to 7.20. This flaw resides within the mg_tls_recv_cert function in the mongoose.c file, specifically affecting the TLS 1.3 handler. The vulnerability can be triggered by manipulating the pubkey argument, which leads to memory corruption. The exploit for this vulnerability is publicly available, increasing the risk of exploitation. Successful exploitation could allow a remote attacker to execute arbitrary code on the affected system. Cesanta has addressed this issue in version 7.21, with patch 0d882f1b43ff2308b7486a56a9d60cd6dba8a3f1.

Attack Chain

An attacker initiates a TLS 1.3 handshake with a vulnerable Mongoose server.
The attacker crafts a malicious TLS certificate containing an oversized pubkey.
The mg_tls_recv_cert function processes the certificate.
Due to insufficient bounds checking, the oversized pubkey overwrites the heap buffer.
The heap overflow corrupts adjacent memory regions.
The attacker leverages memory corruption to gain control of program execution.
The attacker injects and executes arbitrary code on the server.
The attacker achieves complete control over the vulnerable system, potentially leading to data exfiltration or service disruption.

Impact

Successful exploitation of CVE-2026-5244 allows a remote attacker to execute arbitrary code on systems running vulnerable versions of Cesanta Mongoose. This could lead to complete system compromise, data breaches, and denial-of-service conditions. Given the widespread use of Mongoose in embedded systems and IoT devices, a successful attack could impact a large number of devices across various sectors.

Recommendation

Upgrade to Cesanta Mongoose version 7.21 or later to patch CVE-2026-5244, using the provided patch ID 0d882f1b43ff2308b7486a56a9d60cd6dba8a3f1.
Monitor web server logs for unusual TLS handshake patterns or certificate errors that could indicate exploitation attempts against vulnerable Mongoose instances. Utilize the provided Sigma rule to detect potential exploitation attempts.
Implement network intrusion detection systems (IDS) to detect and block malicious TLS traffic targeting vulnerable Mongoose servers.