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Fencer Vulns
high 7.5

CVE-2016-6262 json

idn in libidn before 1.33 might allow remote attackers to obtain sensitive memory information by reading a zero byte as input, which trigge…

published 2016-09-07 10 y ago modified 2026-06-17 4 mo ago also EUVD-2016-7192

cvss
7.5
version 3.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
6.5%
EPSS 6.5% chance of exploitation in 30 days, percentile 93%
public exploits
0
none known

Summary

idn in libidn before 1.33 might allow remote attackers to obtain sensitive memory information by reading a zero byte as input, which triggers an out-of-bounds read, a different vulnerability than CVE-2015-8948.

Patch / fix

  • libidn Ubuntu 14.04 LTS 1.28-1ubuntu2.1
  • libidn Ubuntu 16.04 LTS 1.32-3ubuntu1.1

ubuntu advisories UBUNTU-CVE-2016-6262

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • libidn SLES for SAP 11 SP4, SLES 11 SP4, SLE Software Development Kit 11 SP4 1.10-6.1
  • libidn SLES for SAP 12 SP1, SLES 12 SP1, SLED 12 SP1 +1 more 1.28-4.1

suse advisories SUSE-SU-2016:2291-1SUSE-SU-2016:2079-1

  • libidn Alpine 3.24, Alpine 3.23, Alpine 3.22 +20 more 1.33-r0

alpine advisories ALPINE-CVE-2016-6262

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2016-6262 updated cvss 3.7

libidn: Out-of-bounds read when reading zero byte as input

  • Red Hat Enterprise Linux 5 libidn Red Hat Enterprise Linux 6 libidn Red Hat Enterprise Linux 7 libidn, emacs-libidn
    affected: no fix planned “Will not fix”

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

6.51% chance of exploitation in the next 30 days, higher than 93% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
NVD 3.0 7.5 CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
NVD 2.0 5.0 AV:N/AC:L/Au:N/C:P/I:N/A:N

Classification

Weakness

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.