DEBIAN-CVE-2026-107708

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Source
https://security-tracker.debian.org/tracker/CVE-2026-107708
Import Source
https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-107708.json
JSON Data
https://api.osv.dev/v1/vulns/DEBIAN-CVE-2026-107708
Upstream
Published
2026-10-08T21:17:52Z
Modified
2026-10-14T10:00:29Z
Severity
  • 6.9 (Medium) CVSS_V4 - CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X CVSS Calculator
Summary
[none]
Details

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.

References

Affected packages

Debian:12 / krb5

Package

Name
krb5
Purl
pkg:deb/debian/krb5?arch=source&distro=bookworm

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected

Affected versions

1.*
1.20.1-2
1.20.1-2+deb12u1
1.20.1-2+deb12u2
1.20.1-2+deb12u3
1.20.1-2+deb12u4
1.20.1-2+deb12u5
1.20.1-2+loong64
1.20.1-3
1.20.1-4
1.20.1-5
1.20.1-5.1~exp1
1.20.1-5.1
1.20.1-6
1.21.2-1
1.21.3-1
1.21.3-2
1.21.3-3
1.21.3-4
1.21.3-5
1.22.1-1
1.22.1-2
1.22.1-2.1
1.22.1-3

Ecosystem specific 

{
    "urgency":  "not yet assigned"
}

Database specific

source 
"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-107708.json"

Debian:13 / krb5

Package

Name
krb5
Purl
pkg:deb/debian/krb5?arch=source&distro=trixie

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected

Affected versions

1.*
1.21.3-5
1.21.3-5+deb13u1
1.22.1-1
1.22.1-2
1.22.1-2.1
1.22.1-3

Ecosystem specific 

{
    "urgency":  "not yet assigned"
}

Database specific

source 
"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-107708.json"

Debian:14 / krb5

Package

Name
krb5
Purl
pkg:deb/debian/krb5?arch=source&distro=forky

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected

Affected versions

1.*
1.21.3-5
1.22.1-1
1.22.1-2
1.22.1-2.1
1.22.1-3

Ecosystem specific 

{
    "urgency":  "not yet assigned"
}

Database specific

source 
"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-107708.json"