Ubuntu — Security Activity Report

Canonical Ubuntu (USN advisories)

Generated Nov 13, 2026Cohort: 9 vendors with ≥10 CVE advisoriesMethodology ↗

CVE Disclosure Volume

Total all-time: 31,730 CVEs with Ubuntu advisories. Source: NVD CVE records joined with vendor advisory publish dates.

1,59020221,36320233,89920243,42020256,5222026

Severity Composition

↓ -15.0 pp

39.9% of Ubuntu's 31,730 CVEs are CRITICAL or HIGH severity. Industry median: 54.9%. Source: NVD CVSS v3.1.

CRITICAL 2,430 (7.7%)HIGH 10,216 (32.2%)MEDIUM 11,496 (36.2%)LOW 614 (1.9%)NONE 6,942 (21.9%)

CISA KEV Listings

↓ -0.3 pp

42 of 13,994 Ubuntu CVEs in the last 3 years are on CISA's Known Exploited Vulnerabilities catalog (0.3%). Industry median: 0.6%.

Source: CISA Known Exploited Vulnerabilities catalog (current snapshot). KEV listing means CISA observed active in-the-wild exploitation.

Vendor Patch Velocity

Insufficient data to publish a reliable patch-velocity metric for Ubuntu(sample size: 0, minimum required: 10).

Top Recurring Weakness Classes

Most-frequently mapped CWEs across Ubuntu's last 3 years of CVE disclosures. Source: NVD — CWE mapping per MITRE taxonomy.

  • CWE-476NULL Pointer Dereference1,446 CVEs
  • CWE-416Use After Free1,299 CVEs
  • CWE-125Out-of-bounds Read796 CVEs
  • CWE-787Out-of-bounds Write694 CVEs
  • CWE-401Missing Release of Memory after Effective Lifetime (Memory Leak)569 CVEs

Recent Security Advisories

Latest advisories published by Ubuntu, straight from the vendor's own feed. Severity labels are the vendor's — scales differ across vendors.

Full advisory archive: /pulse/vendor-advisories →

Data sources & corrections

  • NVD National Vulnerability Database (nvd.nist.gov) — CVE records + CVSS v3.1 severity
  • MITRE cvelistV5 (github.com/CVEProject/cvelistV5) — CNA-published CVE timestamps
  • CISA Known Exploited Vulnerabilities catalog (cisa.gov/known-exploited-vulnerabilities-catalog)
  • Vendor security advisories (Red Hat RHSA, Ubuntu USN, Microsoft MSRC, Cisco PSIRT and other per-vendor feeds; the GitHub and OSV advisory databases are not used) — published_at timestamps
  • MITRE CWE taxonomy (cwe.mitre.org) — weakness class mappings

Snapshot generated Nov 13, 2026: when these counts and industry medians were computed. Vendors in the index are recomputed every 6 hours.

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