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CVE-2025-6966Null-pointer dereference in python-apt TagSection.keys()

Description

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.

Timeline

  1. ID reserved

    By canonical

  2. · 5 months later

    Published

  3. · 10 days later

    Record updated

Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.

Scores

CVSS scores of CVE-2025-6966, by who scored it
Scored byCVSSScoreVector
canonicalCNA (assigner)4.0Medium6.9CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
NVDNVD · Analyzed4.0Medium6.9CVSS:4.0/AV:L/AC:L/AT:N/PR:N/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
EPSS (exploitation in 30 days)
0.16% · top 95% of all CVEs (12 Nov 2026)
CISA SSVC
Exploitation: none · Automatable: no · Technical impact: partial
Loading the EPSS history…

The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 6.9.

Affected products

  • Canonical · python-apt

    • affected 3.0 – < 3.0.0ubuntu1.1
    • affected 3.0 – < 3.0.0ubuntu0.25.04.1
    • affected 2.7 – < 2.7.7ubuntu5.1
    • affected 2.4 – < 2.4.0ubuntu4.1
    • affected 2.0 – < 2.0.1ubuntu0.20.04.1+esm1
    • affected 1.6 – < 1.6.6ubuntu0.1~esm1
    • affected 1.1 – < 1.1.0~beta1ubuntu0.16.04.12+esm1
    • affected < 0.9.3.5ubuntu3+esm5

References

References2

Sources

The same CVE in the primary databases and aggregators, to check against.

Badge for a README or a ticket

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Record last updated .