The stringprep_utf8_nfkc_normalize function in lib/nfkc.c in libidn before 1.33 allows context-dependent attackers to cause a denial of service (out-of-bounds read and crash) via crafted UTF-8 data.
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Alpine Linux | — | Upgrade libidn | Aug 30, 2017 | Sep 7, 2016 |
| Debian | — | Upgrade libidn | Sep 2, 2016 | Sep 1, 2016 |
| Freebsd | — | Upgrade libidn | Dec 10, 2025 | Jul 31, 2016 |
| Gentoo Linux | — | Upgrade sys-libs/glibc. | Aug 16, 2019 | Sep 7, 2016 |
| Huawei Euleros 2_0_sp2 | — | Upgrade libidn | Dec 4, 2019 | Sep 7, 2016 |
| Huawei Euleros 2_0_sp3 | — | Upgrade libidn | Sep 25, 2019 | Sep 7, 2016 |
| Huawei Euleros 2_0_sp5 | — | Upgrade libidn | Nov 19, 2019 | Sep 7, 2016 |
| Oracle Solaris | — | Upgrade library/libidn to version 1.33-0.175.3.12.0.2.0 on Solaris 11.3 | May 29, 2017 | Sep 7, 2016 |
| Redhat_linux | — | No solution exists | Jul 9, 2025 | Jan 14, 2016 |
| Suse | — | Upgrade sles12sp1-docker-imageUpgrade libidn2-0-32bitUpgrade sles12-docker-imageUpgrade libidn11Upgrade libidn-toolsUpgrade libidn-x86Upgrade libidn11-32bitUpgrade libidn-develUpgrade libidn2-0Upgrade libidn-32bitUpgrade libidnUpgrade libidn2-devel | Sep 7, 2016 | Sep 7, 2016 |
| Ubuntu | — | Upgrade libidn11 | Aug 24, 2016 | Aug 24, 2016 |
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