CVE-2016-6261

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 idna_to_ascii_4i function in lib/idna.c in libidn before 1.33 allows context-dependent attackers to cause a denial of service (out-of-bounds read and crash) via 64 bytes of input.

Affected products

Canonical Ubuntu Linux: 12.04, 14.04, 16.04
GNU libidn: through 1.32
openSUSE Leap: 42.1

References

http://git.savannah.gnu.org/cgit/libidn.git/commit/?id=f20ce1128fb7f4d33297eee307dddaf0f92ac72d
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/2015-07/msg00016.html
https://lists.gnu.org/archive/html/help-libidn/2016-07/msg00009.html
http://git.savannah.gnu.org/cgit/libidn.git/commit/?id=f20ce1128fb7f4d33297eee307dddaf0f92ac72d

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