Heap Buffer Overflow Vulnerability in Hobbes Package
Summary
OSV-2026-1196: Heap-buffer-overflow in yylex. Affects hobbes versions >= bd8cb86615562113ae09e837b8447d22dd945e80, < 3d08bc2cd3474bb3c41bfb21dc3c7b0b1109e5e7. Fixed in 3d08bc2cd3474bb3c41bfb21dc3c7b0b1109e5e7. How to fix ↓
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Background
Hobbes is an open-source parser library designed for efficient parsing of structured data. It is widely used in various applications for its ability to handle complex data formats. However, like many software libraries, it can be susceptible to vulnerabilities that may compromise its functionality and security. This specific vulnerability relates to a heap buffer overflow, which can lead to unexpected behavior or crashes in applications that utilize the library.
Vulnerability Detail
The vulnerability identified as a heap buffer overflow occurs in the yylex function of the Hobbes package. This issue was reported by OSS-Fuzz and is characterized by a crash type of 'Heap-buffer-overflow WRITE 4'. The crash state indicates that the overflow can occur during the parsing process, specifically in the functions yylex and yyparse. If exploited, this vulnerability could allow an attacker to manipulate the memory of the application, potentially leading to arbitrary code execution or denial of service.
How To Fix
Minimum fixed version
3d08bc2cd3474bb3c41bfb21dc3c7b0b1109e5e7
This is the first release that contains the fix.
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Workaround
As a temporary workaround, you can avoid using the affected functions (yylex and yyparse) until the package is updated. Additionally, ensure that your application has proper input validation to mitigate the risk of exploiting this vulnerability.
Conclusion
The heap buffer overflow vulnerability in the Hobbes package poses significant risks to applications that utilize it. It is crucial to update to the fixed version to ensure the security and stability of your software. Utilizing tools like Vulert can help monitor and manage vulnerabilities effectively.
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FAQ
A heap buffer overflow occurs when a program writes more data to a buffer located on the heap than it can hold, potentially overwriting adjacent memory and leading to unpredictable behavior.
You can check if your application is affected by using Vulert, which monitors and alerts for open-source vulnerabilities in real-time. You can use the Vulert playground to analyze your manifest file.
Exploiting this vulnerability could lead to application crashes, data corruption, or even arbitrary code execution, which poses significant security risks.
Yes, a patch is available in the fixed version of the Hobbes package. It is recommended to update to this version to mitigate the vulnerability.
If immediate updating is not possible, implement input validation and avoid using the affected functions as a temporary workaround.
References
Related vulnerabilities
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