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Fencer Vulns
medium 5.9

CVE-2022-41916 json

Read one byte past a buffer when normalizing Unicode

published 2022-11-15 3 y ago modified 2026-06-17 4 mo ago also EUVD-2022-45046

cvss
5.9
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
1.0%
EPSS 1.0% chance of exploitation in 30 days, percentile 62%
public exploits
0
none known

Summary

Heimdal is an implementation of ASN.1/DER, PKIX, and Kerberos. Versions prior to 7.7.1 are vulnerable to a denial of service vulnerability in Heimdal's PKI certificate validation library, affecting the KDC (via PKINIT) and kinit (via PKINIT), as well as any third-party applications using Heimdal's libhx509. Users should upgrade to Heimdal 7.7.1 or 7.8. There are no known workarounds for this issue.

Patch / fix

  • heimdal_project heimdal 7.7.1
  • heimdal Debian 14, Debian 13, Debian 12 7.8.git20221115.a6cf945+dfsg-1

debian advisories DEBIAN-CVE-2022-41916

  • heimdal Ubuntu 18.04 LTS 7.5.0+dfsg-1ubuntu0.2
  • heimdal Ubuntu 20.04 LTS 7.7.0+dfsg-1ubuntu1.2
  • heimdal Ubuntu Pro 14.04 LTS 1.6~git20131207+dfsg-1ubuntu1.2+esm2
  • heimdal Ubuntu Pro 16.04 LTS 1.7~git20150920+dfsg-4ubuntu1.16.04.1+esm2

ubuntu advisories UBUNTU-CVE-2022-41916

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

  • libheimdal Package Hub 15 SP3, openSUSE Leap 15.3 7.8.0-bp153.2.4.1
  • libheimdal Package Hub 15 SP4, openSUSE Leap 15.4 7.8.0-bp154.2.4.1

opensuse advisories openSUSE-SU-2023:0020-1openSUSE-SU-2023:0019-1

  • heimdal Alpine 3.24, Alpine 3.23, Alpine 3.22 +8 more 7.7.1-r0

alpine advisories ALPINE-CVE-2022-41916

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

  • heimdal CBL-Mariner 2.0 7.7.1-1
  • samba Azure Linux 3.0 4.18.3-1

azure linux advisories AZL-11457AZL-44835

Azure Linux vulnerability data, Copyright (c) Microsoft Corporation, from https://github.com/microsoft/AzureLinuxVulnerabilityData via OSV, under the MIT licence; changed: normalised to fixed package versions per release. MIT

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
18 mo ago

Exploit prediction

1.00% chance of exploitation in the next 30 days, higher than 62% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 5.9 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
NVD 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected products

  • heimdal heimdal

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.