Samsung Escargot Out-of-Bounds Write Vulnerability (CVE-2026-25207)

CVE-2026-25207 is an out-of-bounds write vulnerability affecting Samsung Open Source Escargot, specifically version 97e8115ab1110bc502b4b5e4a0c689a71520d335. This flaw allows attackers to potentially overwrite memory buffers, leading to denial of service or arbitrary code execution. The vulnerability arises due to insufficient bounds checking when handling specific data inputs within the Escargot software. Successful exploitation of this vulnerability could grant an attacker elevated privileges or control over the affected system. The severity of the vulnerability is rated as HIGH with a CVSS score of 7.4, indicating a significant risk to systems running vulnerable versions of Escargot.

Attack Chain

1. An attacker crafts a malicious input designed to trigger the out-of-bounds write.
2. The malicious input is sent to the vulnerable Escargot application. This could involve exploiting a network service that relies on Escargot for data processing.
3. Escargot processes the malicious input without proper bounds checking.
4. The lack of bounds checking allows the input to write data beyond the allocated buffer.
5. The out-of-bounds write overwrites adjacent memory regions, potentially corrupting program data or code.
6. The memory corruption leads to a crash or allows the attacker to overwrite critical function pointers.
7. If function pointers are successfully overwritten, the attacker gains control of program execution.
8. The attacker can execute arbitrary code with the privileges of the Escargot process.

Impact

Successful exploitation of CVE-2026-25207 can lead to arbitrary code execution with the privileges of the Escargot process. This can result in complete system compromise, data loss, or denial of service. Given the potential for remote code execution, this vulnerability poses a significant risk to systems utilizing the vulnerable Escargot version.

Recommendation

• Apply the patch provided in the associated GitHub pull request to remediate the vulnerability. (https://github.com/Samsung/escargot/pull/1554)
• Monitor systems for unexpected crashes or memory corruption events related to the Escargot process.
• Implement input validation and sanitization measures to prevent malicious inputs from reaching the vulnerable code.