CVE catalog

CVE-2026-107708

Severity: Medium · CVSS 6.9CVSS: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
Published: Oct 8, 2026, 8:15:53 PM UTC
Updated: Oct 8, 2026, 9:33:42 PM UTC
Source: [NVD] · [CVE record]
EPSS: 0.52% · Oct 22, 2026

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.

Vulnerable and fixed packages

Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.

Distribution	Package	Release	Version	Status
Debian	krb5	sid	`1.22.1-3`	vulnerable
Debian	krb5	forky	`1.22.1-3`	vulnerable
Debian	krb5	trixie	`1.21.3-5+deb13u1`	vulnerable
Debian	krb5	trixie-security	`1.21.3-5+deb13u1`	vulnerable
Debian	krb5	bookworm	`1.20.1-2+deb12u5`	vulnerable
Debian	krb5	bookworm-security	`1.20.1-2+deb12u5`	vulnerable

Fixed-version evidence

Distribution	Package	Type	Release	Fixed version	Urgency	Origin	Bugs
Debian	krb5	source	sid	`(unfixed)`	not yet assigned	Not reported	[1150461]
Debian	krb5	source	forky	`(unfixed)`	not yet assigned	Not reported	[1150461]
Debian	krb5	source	trixie	`(unfixed)`	not yet assigned	Not reported	[1150461]
Debian	krb5	source	bookworm	`(unfixed)`	not yet assigned	Not reported	[1150461]

[Debian bug #1150461]

Notes

[trixie] krb5: Minor issue [bookworm] krb5: Minor issue

OpenFactory catalog packages

[Debian 12 (Bookworm)]

[krb5-admin-server]Affected
Source package: [krb5]
Details (4)
- 1.20.1-2+deb12u5 · amd64 · bookworm
  Affected
  nvd · krb5 · debian · bookworm
- 1.20.1-2+deb12u5 · arm64 · bookworm
  Affected
  nvd · krb5 · debian · bookworm
- 1.20.1-2+deb12u5 · amd64 · bookworm-security
  Affected
  nvd · krb5 · debian · bookworm
- 1.20.1-2+deb12u5 · arm64 · bookworm-security
  Affected
  nvd · krb5 · debian · bookworm
[krb5-doc]Affected
Source package: [krb5]
Details (4)
- 1.20.1-2+deb12u5 · all · bookworm
  Affected
  nvd · krb5 · debian · bookworm
- 1.20.1-2+deb12u5 · all · bookworm
  Affected
  nvd · krb5 · debian · bookworm
- 1.20.1-2+deb12u5 · all · bookworm-security
  Affected
  nvd · krb5 · debian · bookworm
- 1.20.1-2+deb12u5 · all · bookworm-security
  Affected
  nvd · krb5 · debian · bookworm
[krb5-gss-samples]Affected
Source package: [krb5]
Details (4)
- 1.20.1-2+deb12u5 · amd64 · bookworm
  Affected
  nvd · krb5 · debian · bookworm
- 1.20.1-2+deb12u5 · arm64 · bookworm
  Affected
  nvd · krb5 · debian · bookworm
- 1.20.1-2+deb12u5 · amd64 · bookworm-security
  Affected
  nvd · krb5 · debian · bookworm
- 1.20.1-2+deb12u5 · arm64 · bookworm-security
  Affected
  nvd · krb5 · debian · bookworm
[krb5-k5tls]Affected
Source package: [krb5]
Details (4)
- 1.20.1-2+deb12u5 · amd64 · bookworm
  Affected
  nvd · krb5 · debian · bookworm
- 1.20.1-2+deb12u5 · arm64 · bookworm
  Affected
  nvd · krb5 · debian · bookworm
- 1.20.1-2+deb12u5 · amd64 · bookworm-security
  Affected
  nvd · krb5 · debian · bookworm
- 1.20.1-2+deb12u5 · arm64 · bookworm-security
  Affected
  nvd · krb5 · debian · bookworm
[krb5-kdc]Affected
Source package: [krb5]
Details (4)
- 1.20.1-2+deb12u5 · amd64 · bookworm
  Affected
  nvd · krb5 · debian · bookworm
- 1.20.1-2+deb12u5 · arm64 · bookworm
  Affected
  nvd · krb5 · debian · bookworm
- 1.20.1-2+deb12u5 · amd64 · bookworm-security
  Affected
  nvd · krb5 · debian · bookworm
- 1.20.1-2+deb12u5 · arm64 · bookworm-security
  Affected
  nvd · krb5 · debian · bookworm
[krb5-kdc-ldap]Affected
Source package: [krb5]
Details (4)
- 1.20.1-2+deb12u5 · amd64 · bookworm
  Affected
  nvd · krb5 · debian · bookworm
- 1.20.1-2+deb12u5 · arm64 · bookworm
  Affected
  nvd · krb5 · debian · bookworm
- 1.20.1-2+deb12u5 · amd64 · bookworm-security
  Affected
  nvd · krb5 · debian · bookworm
- 1.20.1-2+deb12u5 · arm64 · bookworm-security
  Affected
  nvd · krb5 · debian · bookworm
[krb5-kpropd]Affected
Source package: [krb5]
Details (4)
- 1.20.1-2+deb12u5 · amd64 · bookworm
  Affected
  nvd · krb5 · debian · bookworm
- 1.20.1-2+deb12u5 · arm64 · bookworm
  Affected
  nvd · krb5 · debian · bookworm
- 1.20.1-2+deb12u5 · amd64 · bookworm-security
  Affected
  nvd · krb5 · debian · bookworm
- 1.20.1-2+deb12u5 · arm64 · bookworm-security
  Affected
  nvd · krb5 · debian · bookworm
[krb5-locales]Affected
Source package: [krb5]
Details (4)
- 1.20.1-2+deb12u5 · all · bookworm
  Affected
  nvd · krb5 · debian · bookworm
- 1.20.1-2+deb12u5 · all · bookworm
  Affected
  nvd · krb5 · debian · bookworm
- 1.20.1-2+deb12u5 · all · bookworm-security
  Affected
  nvd · krb5 · debian · bookworm
- 1.20.1-2+deb12u5 · all · bookworm-security
  Affected
  nvd · krb5 · debian · bookworm
[krb5-multidev]Affected
Source package: [krb5]
Details (4)
- 1.20.1-2+deb12u5 · amd64 · bookworm
  Affected
  nvd · krb5 · debian · bookworm
- 1.20.1-2+deb12u5 · arm64 · bookworm
  Affected
  nvd · krb5 · debian · bookworm
- 1.20.1-2+deb12u5 · amd64 · bookworm-security
  Affected
  nvd · krb5 · debian · bookworm
- 1.20.1-2+deb12u5 · arm64 · bookworm-security
  Affected
  nvd · krb5 · debian · bookworm
[krb5-otp]Affected
Source package: [krb5]
Details (4)
- 1.20.1-2+deb12u5 · amd64 · bookworm
  Affected
  nvd · krb5 · debian · bookworm
- 1.20.1-2+deb12u5 · arm64 · bookworm
  Affected
  nvd · krb5 · debian · bookworm
- 1.20.1-2+deb12u5 · amd64 · bookworm-security
  Affected
  nvd · krb5 · debian · bookworm
- 1.20.1-2+deb12u5 · arm64 · bookworm-security
  Affected
  nvd · krb5 · debian · bookworm
[krb5-pkinit]Affected
Source package: [krb5]
Details (4)
- 1.20.1-2+deb12u5 · amd64 · bookworm
  Affected
  nvd · krb5 · debian · bookworm
- 1.20.1-2+deb12u5 · arm64 · bookworm
  Affected
  nvd · krb5 · debian · bookworm
- 1.20.1-2+deb12u5 · amd64 · bookworm-security
  Affected
  nvd · krb5 · debian · bookworm
- 1.20.1-2+deb12u5 · arm64 · bookworm-security
  Affected
  nvd · krb5 · debian · bookworm
[krb5-user]Affected
Source package: [krb5]
Details (4)
- 1.20.1-2+deb12u5 · amd64 · bookworm
  Affected
  nvd · krb5 · debian · bookworm
- 1.20.1-2+deb12u5 · arm64 · bookworm
  Affected
  nvd · krb5 · debian · bookworm
- 1.20.1-2+deb12u5 · amd64 · bookworm-security
  Affected
  nvd · krb5 · debian · bookworm
- 1.20.1-2+deb12u5 · arm64 · bookworm-security
  Affected
  nvd · krb5 · debian · bookworm
[libgssapi-krb5-2]Affected
Source package: [krb5]
Details (4)
- 1.20.1-2+deb12u5 · amd64 · bookworm
  Affected
  nvd · krb5 · debian · bookworm
- 1.20.1-2+deb12u5 · arm64 · bookworm
  Affected
  nvd · krb5 · debian · bookworm
- 1.20.1-2+deb12u5 · amd64 · bookworm-security
  Affected
  nvd · krb5 · debian · bookworm
- 1.20.1-2+deb12u5 · arm64 · bookworm-security
  Affected
  nvd · krb5 · debian · bookworm
[libgssrpc4]Affected
Source package: [krb5]
Details (4)
- 1.20.1-2+deb12u5 · amd64 · bookworm
  Affected
  nvd · krb5 · debian · bookworm
- 1.20.1-2+deb12u5 · arm64 · bookworm
  Affected
  nvd · krb5 · debian · bookworm
- 1.20.1-2+deb12u5 · amd64 · bookworm-security
  Affected
  nvd · krb5 · debian · bookworm
- 1.20.1-2+deb12u5 · arm64 · bookworm-security
  Affected
  nvd · krb5 · debian · bookworm
[libk5crypto3]Affected
Source package: [krb5]
Details (4)
- 1.20.1-2+deb12u5 · amd64 · bookworm
  Affected
  nvd · krb5 · debian · bookworm
- 1.20.1-2+deb12u5 · arm64 · bookworm
  Affected
  nvd · krb5 · debian · bookworm
- 1.20.1-2+deb12u5 · amd64 · bookworm-security
  Affected
  nvd · krb5 · debian · bookworm
- 1.20.1-2+deb12u5 · arm64 · bookworm-security
  Affected
  nvd · krb5 · debian · bookworm
[libkadm5clnt-mit12]Affected
Source package: [krb5]
Details (4)
- 1.20.1-2+deb12u5 · amd64 · bookworm
  Affected
  nvd · krb5 · debian · bookworm
- 1.20.1-2+deb12u5 · arm64 · bookworm
  Affected
  nvd · krb5 · debian · bookworm
- 1.20.1-2+deb12u5 · amd64 · bookworm-security
  Affected
  nvd · krb5 · debian · bookworm
- 1.20.1-2+deb12u5 · arm64 · bookworm-security
  Affected
  nvd · krb5 · debian · bookworm
[libkadm5srv-mit12]Affected
Source package: [krb5]
Details (4)
- 1.20.1-2+deb12u5 · amd64 · bookworm
  Affected
  nvd · krb5 · debian · bookworm
- 1.20.1-2+deb12u5 · arm64 · bookworm
  Affected
  nvd · krb5 · debian · bookworm
- 1.20.1-2+deb12u5 · amd64 · bookworm-security
  Affected
  nvd · krb5 · debian · bookworm
- 1.20.1-2+deb12u5 · arm64 · bookworm-security
  Affected
  nvd · krb5 · debian · bookworm
[libkdb5-10]Affected
Source package: [krb5]
Details (4)
- 1.20.1-2+deb12u5 · amd64 · bookworm
  Affected
  nvd · krb5 · debian · bookworm
- 1.20.1-2+deb12u5 · arm64 · bookworm
  Affected
  nvd · krb5 · debian · bookworm
- 1.20.1-2+deb12u5 · amd64 · bookworm-security
  Affected
  nvd · krb5 · debian · bookworm
- 1.20.1-2+deb12u5 · arm64 · bookworm-security
  Affected
  nvd · krb5 · debian · bookworm
[libkrad0]Affected
Source package: [krb5]
Details (4)
- 1.20.1-2+deb12u5 · amd64 · bookworm
  Affected
  nvd · krb5 · debian · bookworm
- 1.20.1-2+deb12u5 · arm64 · bookworm
  Affected
  nvd · krb5 · debian · bookworm
- 1.20.1-2+deb12u5 · amd64 · bookworm-security
  Affected
  nvd · krb5 · debian · bookworm
- 1.20.1-2+deb12u5 · arm64 · bookworm-security
  Affected
  nvd · krb5 · debian · bookworm
[libkrad-dev]Affected
Source package: [krb5]
Details (4)
- 1.20.1-2+deb12u5 · amd64 · bookworm
  Affected
  nvd · krb5 · debian · bookworm
- 1.20.1-2+deb12u5 · arm64 · bookworm
  Affected
  nvd · krb5 · debian · bookworm
- 1.20.1-2+deb12u5 · amd64 · bookworm-security
  Affected
  nvd · krb5 · debian · bookworm
- 1.20.1-2+deb12u5 · arm64 · bookworm-security
  Affected
  nvd · krb5 · debian · bookworm

Next results

Observed: Oct 23, 2026, 7:39:52 PM UTC

References

[CERT-Bund public advisories] · [Debian Security Tracker] · [FIRST EPSS] · [National Vulnerability Database (NVD)] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX] · [SUSE security advisories and VEX]