libcurl's URL API function [curl_url_get()](https://curl.se/libcurl/c/curl_url_get.html) offers punycode conversions, to and from IDN. Asking to convert a name that is exactly 256 bytes, libcurl ends up reading outside of a stack based buffer when built to use the *macidn* IDN backend. The conversion function then fills up the provided buffer exactly - but does not null terminate the string.
This flaw can lead to stack contents accidently getting returned as part of the converted string.
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Alpine Linux | — | Upgrade curl | Aug 22, 2024 | Jul 24, 2024 |
| Debian | — | Upgrade curl | Jul 27, 2026 | Jul 27, 2026 |
| Suse | — | Upgrade curlUpgrade libcurl-devel-docUpgrade libcurl-mini4Upgrade curl-zsh-completionUpgrade libcurl4-32bitUpgrade libcurl-devel-32bitUpgrade libcurl-develUpgrade libcurl4 | Dec 5, 2025 | Sep 12, 2025 |
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