Home/CVE/NULL pointer dereference in TagSection.keys() in python-apt on APT-based Linux systems allows a local attacker to cause
CVE

CVE-2025-6966

NULL pointer dereference in TagSection.keys() in python-apt on APT-based Linux systems allows a local attacker to cause

NULL pointer dereference in TagSection.keys() in python-apt on APT-based Linux systems allows a local attacker to cause a denial of service (process crash) via a crafted deb822 file with a malformed non-UTF-8 key.

MEDIUM · CVSS 5.5 EPSS 0.0004
Schedule remediation
  • Public exploit or PoC is available
Sigma rules0 YARA rules0
⬡

Weakness Classification

CWE-476NULL Pointer Dereference
▤

Affected Products & Versions

6
ubuntu python-apt< 0.9.3.11
ubuntu python-apt>= 1.6.0 and < 1.6.6
ubuntu python-apt>= 2.0.0 and < 2.0.1
ubuntu python-apt>= 2.7.0 and < 2.7.7
ubuntu python-aptall versions
debian linuxall versions
⚠

Public Exploits & PoCs

1
pocbugs.launchpad.net · 2091865bugs.launchpad.net
▣

Scoring & Timeline

5.5
MEDIUM · CVSS v3.1 · security@ubuntu.com
View on NVD
Attack Vector
Network Adjacent Local Physical
Attack Complexity
Low High
Privileges Required
None Low High
User Interaction
None Required
Scope
Unchanged Changed
Confidentiality
None Low High
Integrity
None Low High
Availability
None Low High
Published to NVD05 Dec 2025 · 01:16 PM
CVSS VectorCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
SSVC triage · cisa-vulnrichment
Exploitation
none
Automatable
no
Technical impact
partial
SSVC asks the questions that actually drive patch urgency: is it being exploited, can attacks be automated, and how total is the impact.
⚑

Vendor Advisories

2
usnUSN-7916-2
usnUSN-7916-1
🔗

References & Sources

1
Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
https://lists.debian.org/debian-lts-announce/2025/12/msg00019.htmlMailing ListThird Party Advisory
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