cve 2016 9841

CVE-2016-9841 is a security vulnerability in the zlib compression library, specifically in the inffast.c file. The flaw originated from an old pointer-increment optimization that could trigger undefined behavior under modern compilers and certain runtime conditions. This could lead to application crashes, denial-of-service, or potential memory corruption depending on the context. The issue was discovered during an external audit and was fixed upstream by replacing the unsafe optimization with standard, portable pointer operations. This tag covers discussions about the technical details of the vulnerability, its impact, and the fix applied to zlib.