AIKIDO-2026-556093
zlib is vulnerable to Denial of Service (DoS)
29
Low Risk
This Affects:
zlibTL;DR
crc32_combine64() and crc32_combine_gen64() pass the length into x2nmodp(), whose right shift loop does not stop when that length is negative. A negative length keeps the loop running and consumes CPU without returning. The fix rejects a negative length before entering the loop.
Who does this affect?
You are affected if you are using a version that falls within the vulnerable range and your application passes a length from untrusted input to crc32_combine64() or crc32_combine_gen64().
Background info
zlib is vulnerable to Denial of Service (DoS) in versions 1.2.12 - 1.3.1.
How to fix this
Upgrade the zlib library to the patch version.
Links
GitHub Release
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