CVE-2026-126405

Coder from 2.38.0 before 2.38.4 Memory Exhaustion DoS via Web Push

Published Nov 13, 2026 CVSS 4.0 · 7.1 High EPSS n/a KEV · Not listed

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.

Affected Products

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

unaffected

Version	Status	Constraints
`2.38.0`	affected	< 2.38.4
`2.38.4`	unaffected	—

coder

unaffected

Version	Status	Constraints
`2.37.0`	affected	< 2.37.8
`2.37.8`	unaffected	—

coder

unaffected

Version	Status	Constraints
`2.36.0`	affected	< 2.36.11
`2.36.11`	unaffected	—

coder

unaffected

Version	Status	Constraints
`2.30.0`	affected	< 2.34.16
`2.34.16`	unaffected	—

coder

unaffected

Version	Status	Constraints
`2.21.0`	affected	< 2.29.24
`2.29.24`	unaffected	—

coder

unaffected

Version	Status	Constraints
`2.35.0`	affected	< 2.36.0
`2.36.0`	unaffected	—

No data.

No data available yet.

Remediation

No solution or workaround provided in the CVE record

Tracking

Advisories

No advisories available

Metrics

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.

References

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

History

Nov 13, 2026 9:45 AM Description updated. Title updated. First appearance in the feed. Weaknesses updated. Affected versions updated. Affected vendors updated. Added references. Scoring metrics updated View changes

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		https://github.com/coder/coder/security/advisories/GHSA-64xh-rgcx-gg65 https://www.vulncheck.com/advisories/coder-from-2.38.0-before-2.38.4-memory-exhaustion-dos-via-web-push
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'}`