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Vulnerabilities

Threat intelligence · CVE-2025-6966

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 fil

Published Dec 5, 2025 · catalog updated Dec 15, 2025 · Canonical Python-apt

Last checked Nov 2, 2026. A connected source was read within the last 7 days.

Check if you run it

No confirmed exploitation is on record for CVE-2025-6966. EPSS is 0.14%. Act only if a listed version of Canonical Python-apt is installed.

Gaps on this record

  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
Medium6.9
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.14%
Remediation
Version ranges on file
Affected products
vendor Canonical Python-apt 1.1 <1.1.0~beta1ubuntu0.16.04.12+esm1

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.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • vendor Canonical Python-apt 1.1 <1.1.0~beta1ubuntu0.16.04.12+esm11.1 <1.1.0~beta1ubuntu0.16.04.12+esm1

How to fix CVE-2025-6966

  • Upgrade

    CVE-2025-6966 lists a fix boundary at 1.1.0~beta1ubuntu0.16.04.12+esm1. Compare the installed build with that boundary before you change production.

  • Version check

    Seen in 1.1 <1.1.0~beta1ubuntu0.16.04.12+esm1

  • Advisory

    Open the cve_org record and follow its fix.

  • Official advisories

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2025-6966. EPSS is 0.14%. Act only if a listed version of Canonical Python-apt is installed.

Which versions are affected?

Compare what you have installed with Canonical Python-apt 1.1 <1.1.0~beta1ubuntu0.16.04.12+esm1 1.1 <1.1.0~beta1ubuntu0.16.04.12+esm1. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

No weakness class is stored. EPSS 0.14%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Technology hubs

Ubuntu security

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. Dec 5, 2025 · EUVD

    Detected

    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.

  2. Dec 15, 2025 · EUVD

    Updated

    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.

Sources

  • CVE.orgVulnerability recordCVE-2025-6966

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2025-6966

    30-day exploitation probability 0.14%

    first.org
  • EUVDVulnerability recordEUVD-2025-201407

    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.

    euvd.enisa.europa.eu

References

Freshness

Last verified in this catalog Nov 2, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.

  • FIRST EPSSNov 2, 2026
  • CVE.orgOct 27, 2026
  • EUVDOct 27, 2026