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.

Attack Vector Network

Attack Complexity Low

Privileges Required Low

Attack Requirements None

User Interaction None

Vulnerable System Confidentiality Impact None

Vulnerable System Integrity Impact None

Vulnerable System Availability Impact High

Subsequent System Confidentiality Impact None

Subsequent System Integrity Impact None

Subsequent System Availability Impact None

Attack Vector Network

Attack Complexity Low

Privileges Required Low

Scope Unchanged

Confidentiality Impact None

Integrity Impact None

Availability Impact High

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

No EPSS score available.

Key SSVC decision points have not yet been added.

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions
coder coder unaffected
Version Status Constraints
2.38.0 affected < 2.38.4
2.38.4 unaffected —
coder coder unaffected
Version Status Constraints
2.37.0 affected < 2.37.8
2.37.8 unaffected —
coder coder unaffected
Version Status Constraints
2.36.0 affected < 2.36.11
2.36.11 unaffected —
coder coder unaffected
Version Status Constraints
2.30.0 affected < 2.34.16
2.34.16 unaffected —
coder coder unaffected
Version Status Constraints
2.21.0 affected < 2.29.24
2.29.24 unaffected —
coder coder unaffected
Version Status Constraints
2.35.0 affected < 2.36.0
2.36.0 unaffected —

No data.

No data.

No data.

Project Subscriptions

Vendors Products
Coder Subscribe
Coder Subscribe
Advisories

No advisories yet.

Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References
Link Providers
https://github.com/coder/coder/security/advisories/GHSA-64xh-rgcx-gg65 cve-icon cve-icon
https://www.vulncheck.com/advisories/coder-from-2.38.0-before-2.38.4-memory-exhaustion-dos-via-web-push cve-icon cve-icon
History

Fri, 13 Nov 2026 09:45:00 +0000

Type Values Removed Values Added
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.
Title Coder from 2.38.0 before 2.38.4 Memory Exhaustion DoS via Web Push
First Time appeared Coder
Coder coder
Weaknesses CWE-400
CPEs cpe:2.3:a:coder:coder:*:*:*:*:*:*:*:*
Vendors & Products Coder
Coder coder
References
Metrics cvssV3_1

{'score': 6.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H'}

cvssV4_0

{'score': 7.1, 'vector': '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'}

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: VulnCheck

Published:

Updated: 2026-11-13T09:35:44.966Z

Reserved: 2026-11-10T21:32:21.765Z

Link: CVE-2026-126405

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

Published: 2026-11-13T10:17:45.257

Modified: 2026-11-13T10:17:45.257

Link: CVE-2026-126405

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

No data.

Weaknesses