The zlib and libpng included with current version of OptiPNG are not current, which contain critical vulnerability that are repaired by the latest respective libraries.
The last release already has the updated libraries, although, strictly speaking, this does not constitute a "fix".
As a general rule, if the vulnerabilities of the supporting libraries do not affect OptiPNG (e.g. if there is a vulnerability in handling of a chunk that is not processed by OptiPNG), there is no stringent need to update.
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