Versions mentioned in the description apply to the upstream
Remediation section below for
Alpine:3.10 relevant versions.
The URL percent-encoding decode function in libcurl before 7.51.0 is called
curl_easy_unescape. Internally, even if this function would be made to allocate a unscape destination buffer larger than 2GB, it would return that new length in a signed 32 bit integer variable, thus the length would get either just truncated or both truncated and turned negative. That could then lead to libcurl writing outside of its heap based buffer.
curl to version 7.51.0 or higher.