6.9

CVE-2026-107708: mit krb5 NULL Pointer Dereference

CVSS: 6.9v4.0MediumAwaiting analysis
AliasesDEBIAN-CVE-2026-107708UBUNTU-CVE-2026-107708
Published 08-10-2026Last modified 14-10-2026
Open JSON

Vulnerability summary

CVE-2026-107708 is a medium (CVSS 6.9) NULL Pointer Dereference vulnerability in mit krb5. EPSS estimates a 0.52% chance of exploitation in the next 30 days, higher than 43% of scored vulnerabilities.

Overall risk
28/100
0100
Medium · default modelHow is this calculated?
CVSS score
6.9/10
010
Medium · v4.0 (CVE.org)
EPSS score
0.52%
0%100%
Low · Change unavailable
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 1
RHSA-2026:80481

Timeline

  1. 08-10-2026
    PublishedVulnerability first disclosed.
  2. 14-10-2026
    Last modifiedVulnerability information updated.

Description

MIT krb5 through 1.22.2 contains a NULL pointer dereference vulnerability in the KDC's get_pac_princ_with_realm() that returns success while leaving the client principal NULL on malformed names. A malicious or compromised cross-realm trusted KDC can send an S4U2Proxy request with a PAC carrying a malformed client name to crash krb5kdc and deny authentication.

CVSS metrics

7 scores · 4 sources · 2 versions

EPSS trend

Probability

0.52%

Chance of exploitation in the next 30 days

Percentile

43%

Versus all other CVEs

30-day change

Change unavailable

Change unavailable

09-10-202620-10-2026
EPSS score
0.52%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Debian1 product
  • krb5All versions (No fix recorded)
Mit1 product
Ubuntu1 product
  • krb5All versions (No fix recorded)

3 vendors · 3 products

References

9 links