Description
Off-by-one error in the append_utf8_value function in the DN decoder (dn.c) in Libksba before 1.3.4 allows remote attackers to cause a denial of service (out-of-bounds read) via invalid utf-8 encoded data. NOTE: this vulnerability exists because of an incomplete fix for CVE-2016-4356.
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | libksba | 1.3.4-3 | — |
| Debian 13 | libksba | 1.3.4-3 | — |
| Debian 12 | libksba | 1.3.4-3 | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 16.04 LTS | libksba | 1.3.3-1ubuntu0.16.04.1 | USN-2982-1 |
| Ubuntu 14.04 LTS | libksba | 1.3.0-3ubuntu0.14.04.2 | USN-2982-1 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 12 SP1 | libksba | 1.3.0-23.1 | SUSE-SU-2016:1510-1 |
| SLES 12 | libksba | 1.3.0-23.1 | SUSE-SU-2016:1510-1 |
| SLES 11 SP4 | libksba | 1.0.4-1.25.1 | SUSE-SU-2016:1509-1 |
Show 3 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES for SAP 12 SP1 | libksba | 1.3.0-23.1 | SUSE-SU-2016:1510-1 |
| SLES for SAP 12 | libksba | 1.3.0-23.1 | SUSE-SU-2016:1510-1 |
| SLES for SAP 11 SP4 | libksba | 1.0.4-1.25.1 | SUSE-SU-2016:1509-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | libksba | 1.3.5-1.3 | openSUSE-SU-2024:10126-1 |
Advisories 4
- USN-2982-1 libksba vulnerabilities Ubuntu Security Notices (USN) · Apr 22, 2026
- openSUSE-SU-2024:10126-1 libksba-devel-1.3.5-1.3 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2016:1510-1 Security update for libksba SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2016:1509-1 Security update for libksba SUSE / openSUSE Security Updates · Feb 4, 2026
References
- [oss-security] 20160510 Re: Re: CVE request: three issues in libksba mailing-list
- USN-2982-1 vendor-advisory
- openSUSE-SU-2016:1525 vendor-advisory
- [oss-security] 20160510 Re: CVE request: three issues in libksba mailing-list
- openSUSE-SU-2016:1370 vendor-advisory
- http://git.gnupg.org/cgi-bin/gitweb.cgi?p=libksba.git%3Ba=commit%3Bh=6be61daac047d8e6aa941eb103f8e71a1d4e3c75