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CVE-2016-6261

The idna_to_ascii_4i function in lib/idna.c in libidn before 1.33 allows context-dependent...

7.5 HighFix available

CVE-2016-6261 is a high vulnerability (CVSS 7.5) in Gnu Libidn, published July 21, 2016. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 3.88%, the 90th percentile. Fixed in libidn 1.33-r0.

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.

Attack profile

How easy it is to exploit

Attack vector
Network
Complexity
Low
Privileges needed
None
User interaction
None

What an attacker can affect

Confidentiality
None
Integrity
None
Availability
High

Exploit likelihood

3.88%Up 2.3 points since Feb 4, 2022
90%50%10%1%

What each source reports

NVD Score used 7.5

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.

Record
CVE-2016-6261
CVSS 3.0
7.5 HighCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CVSS 2.0
5.0 MediumAV:N/AC:L/Au:N/C:N/I:N/A:P
Weakness
CWE-125
Updated
2026-11-02
CVE List No score

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.

Record
CVE-2016-6261
Updated
2026-11-02
EUVDEUVD-2016-7191 No score

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.

Record
EUVD-2016-7191
Updated
2026-11-03
GitHub AdvisoriesGHSA-hr7q-x7xm-q959 7.5

The idna_to_ascii_4i function in lib/idna.c in libidn before 1.33 allows context-dependent...

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.

Record
GHSA-hr7q-x7xm-q959
CVSS 3.0
7.5 HighCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness
CWE-125
Updated
2026-11-02
OSVALPINE-CVE-2016-6261 7.5

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.

Record
ALPINE-CVE-2016-6261
CVSS 3.0
7.5 HighCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Updated
2026-11-02
OSV 7.5

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.

Record
CVE-2016-6261
CVSS 3.0
7.5 HighCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Updated
2026-11-03
Show 10 moreShow less
OSVDEBIAN-CVE-2016-6261 7.5

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.

Record
DEBIAN-CVE-2016-6261
CVSS 3.0
7.5 HighCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Updated
2026-11-02
OSVUBUNTU-CVE-2016-6261 7.5

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.

Record
UBUNTU-CVE-2016-6261
CVSS 3.0
7.5 HighCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Updated
2026-11-02
OSVMGASA-2016-0269 No score

Updated libidn packages fix security vulnerability

Out-of-bounds stack read in libidn before 1.33 in idna_to_ascii_4i (CVE-2016-6261).

Out-of-bounds-read in libidn when reading one zero byte as input (CVE-2015-8948, CVE-2016-6262).

In libidn before 1.33, stringprep_utf8_nfkc_normalize would crash when presented with invalid UTF-8 (CVE-2016-6263).

Record
MGASA-2016-0269
Updated
2026-11-02
OSVopenSUSE-SU-2024:10566-1 No score

libidn-devel-1.33-2.3 on GA media

These are all security issues fixed in the libidn-devel-1.33-2.3 package on the GA media of openSUSE Tumbleweed.

Record
openSUSE-SU-2024:10566-1
Updated
2026-11-02
OSVopenSUSE-SU-2024:10792-1 No score

glibc-2.34-1.2 on GA media

These are all security issues fixed in the glibc-2.34-1.2 package on the GA media of openSUSE Tumbleweed.

Record
openSUSE-SU-2024:10792-1
Updated
2026-11-02
OSVSUSE-SU-2016:2079-1 No score

Security update for libidn

This update for libidn fixes the following issues:

  • CVE-2016-6262 and CVE-2015-8948: Out-of-bounds-read when reading one zero byte as input (bsc#990189)

  • CVE-2016-6261: Out-of-bounds stack read in idna_to_ascii_4i (bsc#990190)

  • CVE-2016-6263: stringprep_utf8_nfkc_normalize reject invalid UTF-8 (bsc#990191)

  • CVE-2015-2059: out-of-bounds read with stringprep on invalid UTF-8 (bsc#923241)

Record
SUSE-SU-2016:2079-1
Updated
2026-11-02
OSVSUSE-SU-2016:2291-1 No score

Security update for libidn

This update for libidn fixes the following issues:

  • CVE-2016-6262 and CVE-2015-8948: Out-of-bounds-read when reading one zero byte as input (bsc#990189)

  • CVE-2016-6261: Out-of-bounds stack read in idna_to_ascii_4i (bsc#990190)

  • CVE-2016-6263: stringprep_utf8_nfkc_normalize reject invalid UTF-8 (bsc#990191)

  • CVE-2015-2059: out-of-bounds read with stringprep on invalid UTF-8 (bsc#923241)

Record
SUSE-SU-2016:2291-1
Updated
2026-11-02
OSVSUSE-SU-2017:2699-1 No score

Security update for SLES 12 Docker image

The SUSE Linux Enterprise Server 12 container image has been updated to include security and stability fixes.

The following issues related to building of the container images have been fixed:

  • Included krb5 package to avoid the inclusion of krb5-mini which gets selected as a dependency by the Build Service solver. (bsc#1056193)
  • Do not install recommended packages when building container images. (bsc#975726)

A number of security issues that have been already fixed by updates released for SUSE Linux Enterprise Server 12 are now included in the base image. A package/CVE cross-reference is available below.

pam:

  • CVE-2015-3238

libtasn1:

  • CVE-2015-3622
  • CVE-2016-4008

libidn:

  • CVE-2015-2059
  • CVE-2015-8948
  • CVE-2016-6261
  • CVE-2016-6262
  • CVE-2016-6263

zlib:

  • CVE-2016-9840
  • CVE-2016-9841
  • CVE-2016-9842
  • CVE-2016-9843

curl:

  • CVE-2016-5419
  • CVE-2016-5420
  • CVE-2016-5421
  • CVE-2016-7141
  • CVE-2016-7167
  • CVE-2016-8615
  • CVE-2016-8616
  • CVE-2016-8617
  • CVE-2016-8618
  • CVE-2016-8619
  • CVE-2016-8620
  • CVE-2016-8621
  • CVE-2016-8622
  • CVE-2016-8623
  • CVE-2016-8624
  • CVE-2016-9586
  • CVE-2017-1000100
  • CVE-2017-1000101
  • CVE-2017-7407

openssl:

  • CVE-2016-2105
  • CVE-2016-2106
  • CVE-2016-2107
  • CVE-2016-2108
  • CVE-2016-2109
  • CVE-2016-2177
  • CVE-2016-2178
  • CVE-2016-2179
  • CVE-2016-2180
  • CVE-2016-2181
  • CVE-2016-2182
  • CVE-2016-2183
  • CVE-2016-6302
  • CVE-2016-6303
  • CVE-2016-6304
  • CVE-2016-6306

libxml2:

  • CVE-2014-0191
  • CVE-2015-8806
  • CVE-2016-1762
  • CVE-2016-1833
  • CVE-2016-1834
  • CVE-2016-1835
  • CVE-2016-1837
  • CVE-2016-1838
  • CVE-2016-1839
  • CVE-2016-1840
  • CVE-2016-2073
  • CVE-2016-3627
  • CVE-2016-3705
  • CVE-2016-4447
  • CVE-2016-4448
  • CVE-2016-4449
  • CVE-2016-4483
  • CVE-2016-4658
  • CVE-2016-9318
  • CVE-2016-9597
  • CVE-2017-9047
  • CVE-2017-9048
  • CVE-2017-9049
  • CVE-2017-9050

util-linux:

  • CVE-2015-5218
  • CVE-2016-5011
  • CVE-2017-2616

cracklib:

  • CVE-2016-6318

systemd:

  • CVE-2014-9770
  • CVE-2015-8842
  • CVE-2016-7796

pcre:

  • CVE-2014-8964
  • CVE-2015-2325
  • CVE-2015-2327
  • CVE-2015-2328
  • CVE-2015-3210
  • CVE-2015-3217
  • CVE-2015-5073
  • CVE-2015-8380
  • CVE-2015-8381
  • CVE-2015-8382
  • CVE-2015-8383
  • CVE-2015-8384
  • CVE-2015-8385
  • CVE-2015-8386
  • CVE-2015-8387
  • CVE-2015-8388
  • CVE-2015-8389
  • CVE-2015-8390
  • CVE-2015-8391
  • CVE-2015-8392
  • CVE-2015-8393
  • CVE-2015-8394
  • CVE-2015-8395
  • CVE-2016-1283
  • CVE-2016-3191

appamor:

  • CVE-2017-6507

bash:

  • CVE-2014-6277
  • CVE-2014-6278
  • CVE-2016-0634
  • CVE-2016-7543

cpio:

  • CVE-2016-2037

glibc:

  • CVE-2016-1234
  • CVE-2016-3075
  • CVE-2016-3706
  • CVE-2016-4429
  • CVE-2017-1000366

perl:

  • CVE-2015-8853
  • CVE-2016-1238
  • CVE-2016-2381
  • CVE-2016-6185

libssh2_org:

  • CVE-2016-0787

expat:

  • CVE-2012-6702
  • CVE-2015-1283
  • CVE-2016-0718
  • CVE-2016-5300
  • CVE-2016-9063
  • CVE-2017-9233

ncurses:

  • CVE-2017-10684
  • CVE-2017-10685
  • CVE-2017-11112
  • CVE-2017-11113

libksba:

  • CVE-2016-4574
  • CVE-2016-4579

libgcrypt:

  • CVE-2015-7511
  • CVE-2016-6313
  • CVE-2017-7526

dbus-1:

  • CVE-2014-7824
  • CVE-2015-0245

Finally, the following packages received non-security fixes:

  • augeas
  • bzip2
  • ca-certificates-mozilla
  • coreutils
  • cryptsetup
  • cyrus-sasl
  • dirmngr
  • e2fsprogs
  • findutils
  • gpg2
  • insserv-compat
  • kmod
  • libcap
  • libsolv
  • libzypp
  • openldap2
  • p11-kit
  • permissions
  • procps
  • rpm
  • sed
  • shadow
  • zypper
Record
SUSE-SU-2017:2699-1
Updated
2026-11-02
OSVSUSE-SU-2017:2700-1 No score

Security update for SLES 12-SP1 Docker image

The SUSE Linux Enterprise Server 12 SP1 container image has been updated to include security and stability fixes.

The following issues related to building of the container images have been fixed:

  • Included krb5 package to avoid the inclusion of krb5-mini which gets selected as a dependency by the Build Service solver. (bsc#1056193)
  • Do not install recommended packages when building container images. (bsc#975726)

A number of security issues that have been already fixed by updates released for SUSE Linux Enterprise Server 12 SP1 are now included in the base image. A package/CVE cross-reference is available below.

pam:

  • CVE-2015-3238

libtasn1:

  • CVE-2015-3622
  • CVE-2016-4008

expat:

expat:

  • CVE-2012-6702
  • CVE-2015-1283
  • CVE-2016-0718
  • CVE-2016-5300
  • CVE-2016-9063
  • CVE-2017-9233

libidn:

  • CVE-2015-2059
  • CVE-2015-8948
  • CVE-2016-6261
  • CVE-2016-6262
  • CVE-2016-6263

zlib:

  • CVE-2016-9840
  • CVE-2016-9841
  • CVE-2016-9842
  • CVE-2016-9843

curl:

  • CVE-2016-5419
  • CVE-2016-5420
  • CVE-2016-5421
  • CVE-2016-7141
  • CVE-2016-7167
  • CVE-2016-8615
  • CVE-2016-8616
  • CVE-2016-8617
  • CVE-2016-8618
  • CVE-2016-8619
  • CVE-2016-8620
  • CVE-2016-8621
  • CVE-2016-8622
  • CVE-2016-8623
  • CVE-2016-8624
  • CVE-2016-9586
  • CVE-2017-1000100
  • CVE-2017-1000101
  • CVE-2017-7407

openssl:

  • CVE-2016-2105
  • CVE-2016-2106
  • CVE-2016-2107
  • CVE-2016-2108
  • CVE-2016-2109
  • CVE-2016-2177
  • CVE-2016-2178
  • CVE-2016-2179
  • CVE-2016-2180
  • CVE-2016-2181
  • CVE-2016-2182
  • CVE-2016-2183
  • CVE-2016-6302
  • CVE-2016-6303
  • CVE-2016-6304
  • CVE-2016-6306
  • CVE-2016-7056
  • CVE-2016-8610
  • CVE-2017-3731

cracklib:

  • CVE-2016-6318

pcre:

  • CVE-2014-8964
  • CVE-2015-2325
  • CVE-2015-2327
  • CVE-2015-2328
  • CVE-2015-3210
  • CVE-2015-3217
  • CVE-2015-5073
  • CVE-2015-8380
  • CVE-2015-8381
  • CVE-2015-8382
  • CVE-2015-8383
  • CVE-2015-8384
  • CVE-2015-8385
  • CVE-2015-8386
  • CVE-2015-8387
  • CVE-2015-8388
  • CVE-2015-8389
  • CVE-2015-8390
  • CVE-2015-8391
  • CVE-2015-8392
  • CVE-2015-8393
  • CVE-2015-8394
  • CVE-2015-8395
  • CVE-2016-1283
  • CVE-2016-3191

appamor:

  • CVE-2017-6507

bash:

  • CVE-2014-6277
  • CVE-2014-6278
  • CVE-2016-0634
  • CVE-2016-7543

cpio:

  • CVE-2016-2037

glibc:

  • CVE-2016-1234
  • CVE-2016-3075
  • CVE-2016-3706
  • CVE-2016-4429
  • CVE-2017-1000366

perl:

  • CVE-2015-8853
  • CVE-2016-1238
  • CVE-2016-2381
  • CVE-2016-6185

libssh2_org:

  • CVE-2016-0787

util-linux:

  • CVE-2016-5011
  • CVE-2017-2616

ncurses:

  • CVE-2017-10684
  • CVE-2017-10685
  • CVE-2017-11112
  • CVE-2017-11113

libksba:

  • CVE-2016-4574
  • CVE-2016-4579

libxml2:

  • CVE-2014-0191
  • CVE-2015-8806
  • CVE-2016-1762
  • CVE-2016-1833
  • CVE-2016-1834
  • CVE-2016-1835
  • CVE-2016-1837
  • CVE-2016-1838
  • CVE-2016-1839
  • CVE-2016-1840
  • CVE-2016-2073
  • CVE-2016-3627
  • CVE-2016-3705
  • CVE-2016-4447
  • CVE-2016-4448
  • CVE-2016-4449
  • CVE-2016-4483
  • CVE-2016-4658
  • CVE-2016-9318
  • CVE-2016-9597
  • CVE-2017-9047
  • CVE-2017-9048
  • CVE-2017-9049
  • CVE-2017-9050

libgcrypt:

  • CVE-2015-7511
  • CVE-2016-6313
  • CVE-2017-7526

update-alternatives:

  • CVE-2015-0860

systemd:

  • CVE-2014-9770
  • CVE-2015-8842
  • CVE-2016-7796

dbus-1:

  • CVE-2014-7824
  • CVE-2015-0245

Finally, the following packages received non-security fixes:

  • augeas
  • bzip2
  • ca-certificates-mozilla
  • coreutils
  • cryptsetup
  • cyrus-sasl
  • dirmngr
  • e2fsprogs
  • findutils
  • gpg2
  • insserv-compat
  • kmod
  • libcap
  • libsolv
  • libzypp
  • lua51
  • lvm2
  • netcfg
  • p11-kit
  • permissions
  • procps
  • rpm
  • sed
  • sg3_utils
  • shadow
  • zypper
Record
SUSE-SU-2017:2700-1
Updated
2026-11-02
OSVUSN-3068-1 No score

libidn vulnerabilities

Thijs Alkemade, Gustavo Grieco, Daniel Stenberg, and Nikos Mavrogiannopoulos discovered that Libidn incorrectly handled invalid UTF-8 characters. A remote attacker could use this issue to cause Libidn to crash, resulting in a denial of service, or possibly disclose sensitive memory. This issue only applied to Ubuntu 12.04 LTS and Ubuntu 14.04 LTS. (CVE-2015-2059)

Hanno Böck discovered that Libidn incorrectly handled certain input. A remote attacker could possibly use this issue to cause Libidn to crash, resulting in a denial of service. (CVE-2015-8948, CVE-2016-6262, CVE-2016-6261, CVE-2016-6263)

Record
USN-3068-1
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
libidn
Alpine:v3.10
 before 1.33-r0
1.33-r0
libidn
Alpine:v3.11
 before 1.33-r0
1.33-r0
libidn
Alpine:v3.12
 before 1.33-r0
1.33-r0
libidn
Alpine:v3.13
 before 1.33-r0
1.33-r0
libidn
Alpine:v3.14
 before 1.33-r0
1.33-r0
libidn
Alpine:v3.15
 before 1.33-r0
1.33-r0
libidn
Alpine:v3.16
 before 1.33-r0
1.33-r0
libidn
Alpine:v3.17
 before 1.33-r0
1.33-r0
libidn
Alpine:v3.18
 before 1.33-r0
1.33-r0
libidn
Alpine:v3.19
 before 1.33-r0
1.33-r0
Show 29 moreShow less
Affected packages
PackageAffectedFixed
libidn
Alpine:v3.2
 before 1.33-r0
1.33-r0
libidn
Alpine:v3.20
 before 1.33-r0
1.33-r0
libidn
Alpine:v3.21
 before 1.33-r0
1.33-r0
libidn
Alpine:v3.22
 before 1.33-r0
1.33-r0
libidn
Alpine:v3.23
 before 1.33-r0
1.33-r0
libidn
Alpine:v3.24
 before 1.33-r0
1.33-r0
libidn
Alpine:v3.3
 before 1.33-r0
1.33-r0
libidn
Alpine:v3.4
 before 1.33-r0
1.33-r0
libidn
Alpine:v3.5
 before 1.33-r0
1.33-r0
libidn
Alpine:v3.6
 before 1.33-r0
1.33-r0
libidn
Alpine:v3.7
 before 1.33-r0
1.33-r0
libidn
Alpine:v3.8
 before 1.33-r0
1.33-r0
libidn
Alpine:v3.9
 before 1.33-r0
1.33-r0
libidn
Debian:12
 before 1.33-1
1.33-1
libidn
Debian:13
 before 1.33-1
1.33-1
libidn
Debian:14
 before 1.33-1
1.33-1
libidn
Debian:7
 before 1.25-2+deb7u2, plus listed versions
1.25-21.25-2+deb7u1
1.25-2+deb7u2
libidn
Debian:8
 before 1.29-1+deb8u2, plus listed versions
1.29-11.29-1+deb8u1
1.29-1+deb8u2
libidn
Mageia:5
 before 1.33-1.mga5
1.33-1.mga5
libidn
SUSE:Linux Enterprise Desktop 12 SP1
 before 1.28-4.1
1.28-4.1
libidn
SUSE:Linux Enterprise Software Development Kit 12 SP1
 before 1.28-4.1
1.28-4.1
libidn
SUSE:Linux Enterprise Server 12 SP1
 before 1.28-4.1
1.28-4.1
libidn
SUSE:Linux Enterprise Server for SAP Applications 12 SP1
 before 1.28-4.1
1.28-4.1
libidn
SUSE:Linux Enterprise Software Development Kit 11 SP4
 before 1.10-6.1
1.10-6.1
libidn
SUSE:Linux Enterprise Server 11 SP4
 before 1.10-6.1
1.10-6.1
libidn
SUSE:Linux Enterprise Server for SAP Applications 11 SP4
 before 1.10-6.1
1.10-6.1
libidn
Ubuntu:14.04:LTS
 before 1.28-1ubuntu2.1, plus listed versions
1.28-1ubuntu11.28-1ubuntu2
1.28-1ubuntu2.1
libidn
Ubuntu:16.04:LTS
 before 1.32-3ubuntu1.1, plus listed versions
1.28-1ubuntu21.32-3ubuntu1
1.32-3ubuntu1.1
glibc
openSUSE:Tumbleweed
 before 2.34-1.2
2.34-1.2

History

History
WhenChangedSources
2026-11-03aliasesEUVD
2026-11-02createdCVE List, GitHub Advisories, NVD, OSV

References

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