CVE-2016-6263

Severity: high (CVSS 7.5 v3.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 3.9% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2016-09-07 · updated 2026-06-17
Weakness: CWE-125

Description

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.

Affected products

GNU libidn: through 1.32

References

http://git.savannah.gnu.org/cgit/libidn.git/commit/?id=1fbee57ef3c72db2206dd87e4162108b2f425555
http://lists.opensuse.org/opensuse-updates/2016-08/msg00005.html
http://lists.opensuse.org/opensuse-updates/2016-08/msg00098.html
http://www.debian.org/security/2016/dsa-3658
http://www.openwall.com/lists/oss-security/2016/07/20/6
http://www.openwall.com/lists/oss-security/2016/07/21/4
http://www.securityfocus.com/bid/92070
http://www.ubuntu.com/usn/USN-3068-1
https://lists.apache.org/thread.html/r58af02e294bd07f487e2c64ffc0a29b837db5600e33b6e698b9d696b%40%3Cissues.bookkeeper.apache.org%3E
https://lists.apache.org/thread.html/rf4c02775860db415b4955778a131c2795223f61cb8c6a450893651e4%40%3Cissues.bookkeeper.apache.org%3E
https://lists.gnu.org/archive/html/help-libidn/2016-07/msg00009.html
https://security.gentoo.org/glsa/201908-06

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