CVE-2026-48801

Description

linkify-it is a links recognition library with full Unicode support. Prior to 5.0.1, LinkifyIt.prototype.match, the package's primary public API, has O(N²) algorithmic complexity for inputs containing many fuzzy links or emails because the JavaScript-level scan loop re-slices input and re-runs unanchored regex searches on progressively shorter tails. Any service that synchronously renders untrusted Markdown with linkify:true on a request hot path can inherit a worker-process denial of service triggerable by a tens-of-KB request body. This issue is fixed in version 5.0.1.

CVSS Metrics

• v4.0•HIGH•Score: 8.7CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
• v4.0•HIGH•Score: 8.7CVSS:4.0/AV:N/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
• v3.1•HIGH•Score: 7.5CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS Trends

Current EPSS score: 0.37%• Percentile: 30%

Techniques & Countermeasures

• CWE-1333•Inefficient Regular Expression Complexity

  The product uses a regular expression with a worst-case computational complexity that is inefficient and possibly exponential.

Affected Systems

• chainguard•argo-workflows-ui-3.6

  < 3.6.19-r7

• chainguard•gitlab-rails-ce-18.1

  < 18.1.6-r24

• chainguard•gitlab-rails-ce-18.10

  all

• chainguard•gitlab-rails-ce-18.11

  < 18.11.6-r10

• chainguard•gitlab-rails-ce-18.5

  all

• chainguard•gitlab-rails-ce-18.6

  all

• chainguard•gitlab-rails-ce-18.7

  all

• chainguard•gitlab-rails-ce-18.8

  all

• chainguard•gitlab-rails-ce-18.9

  all

• chainguard•gitlab-rails-ce-19.0

  < 19.0.4-r5

• chainguard•gitlab-rails-ce-19.1

  < 19.1.2-r5

• chainguard•gitlab-rails-ce-fips-18.1

  < 18.1.6-r81

• chainguard•gitlab-rails-ce-fips-18.10

  all

• chainguard•gitlab-rails-ce-fips-18.11

  < 18.11.7-r4

• chainguard•gitlab-rails-ce-fips-18.5

  all

• chainguard•gitlab-rails-ce-fips-18.6

  all

• chainguard•gitlab-rails-ce-fips-18.7

  all

• chainguard•gitlab-rails-ce-fips-18.8

  all

• chainguard•gitlab-rails-ce-fips-18.9

  all

• chainguard•gitlab-rails-ce-fips-19.0

  < 19.0.4-r10

• chainguard•gitlab-rails-ce-fips-19.1

  < 19.1.3-r0

• chainguard•gitlab-rails-ce-fips-19.2

  < 19.2.1-r2

• chainguard•kibana-7

  all

• chainguard•kibana-8.19

  < 8.19.17-r2

• chainguard•kibana-8.19-bitnami

  < 8.19.17-r2

• chainguard•kibana-8.19-iamguarded

  < 8.19.17-r2

• chainguard•kibana-9.2

  < 9.2.8-r15

• chainguard•kibana-9.2-iamguarded

  < 9.2.8-r15

• chainguard•kibana-9.4

  < 9.4.2-r6

• chainguard•kibana-9.4-iamguarded

  < 9.4.2-r6

• chainguard•opensearch-dashboards-3-dashboards-observability

  < 3.7.0-r5

• chainguard•opensearch-dashboards-3-fips-dashboards-observability

  < 3.7.0-r3

• chainguard•semaphore

  < 2.18.12-r2

• chainguard•vitess-22

  all

• wolfi•opensearch-dashboards-3-dashboards-observability

  < 3.7.0-r5

• ubuntu•node-markdown-it

  all | all | all

• markdown-it•linkify-it

  < 5.0.1

• Npm•linkify-it

  < 5.0.1

References (7)

• https://github.com/markdown-it/linkify-it/security/advisories/GHSA-22p9-wv53-3rq4
• https://github.com/markdown-it/linkify-it
• https://github.com/markdown-it/linkify-it/commit/6be6d15e0641bf1daeaa977d500cabc743166159
• https://ubuntu.com/security/CVE-2026-48801
• https://www.cve.org/CVERecord?id=CVE-2026-48801
• https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/48xxx/CVE-2026-48801.json
• https://nvd.nist.gov/vuln/detail/CVE-2026-48801