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CVE-2026-126405

Coder from 2.38.0 before 2.38.4 Memory Exhaustion DoS via Web Push

  • High 7.1

Description

Coder 2.21.0 before 2.29.24, 2.30.0 before 2.34.16, 2.35.0 before 2.36.11, 2.37.0 before 2.37.8, and 2.38.0 before 2.38.4 reads Web Push endpoint responses in webpushSend with io.ReadAll, without a size limit or client timeout. Any authenticated user can register a subscription via POST /api/v2/users/{user}/webpush/subscription pointing to a server returning an endless body, exhausting coderd memory and crashing the API, dashboard, and workspace connections.

Key facts

Published
13 Nov 2026
Last changed
13 Nov 2026
Assigned by
VulnCheck
EPSS
0.307% likely to be exploited in the next 30 days, higher than 23.78% of CVEs (scores for 15 Nov 2026)

Severity scores

Each score is shown as its source gave it. They are not averaged or merged.

  • 7.1CVSS 4.0, Highfrom the CNA (VulnCheck)CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
  • 6.5CVSS 3.1, Mediumfrom the CNA (VulnCheck)CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Historical context and remediation

This reference retains the original CVE publication date. A recent record update does not mean a new attack occurred.

No separately sourced impact summary is available on this page yet. Consult the description, version data and dated exploitation evidence.

No explicit remediation statement is available on this page yet. Consult the original record and vendor references before choosing a fix.

Version statuses below come from the CNA. An “unaffected” version is not necessarily a currently supported release or proof of a patch date. EPSS is a dated risk estimate, not a count of historical attacks.

Read the original CVE record.

Affected products

VendorProductVersions
codercoder
  • Default status: unaffected
  • 2.38.0 up to but excluding 2.38.4 (affected)
  • 2.38.4 (unaffected)
codercoder
  • Default status: unaffected
  • 2.37.0 up to but excluding 2.37.8 (affected)
  • 2.37.8 (unaffected)
codercoder
  • Default status: unaffected
  • 2.36.0 up to but excluding 2.36.11 (affected)
  • 2.36.11 (unaffected)
codercoder
  • Default status: unaffected
  • 2.30.0 up to but excluding 2.34.16 (affected)
  • 2.34.16 (unaffected)
codercoder
  • Default status: unaffected
  • 2.21.0 up to but excluding 2.29.24 (affected)
  • 2.29.24 (unaffected)
codercoder
  • Default status: unaffected
  • 2.35.0 up to but excluding 2.36.0 (affected)
  • 2.36.0 (unaffected)

Timeline

  1. 13 Nov 2026 Published

Weakness

References