Staging Environment: Content and features may be unstable or change without notice.
Advisory details: github_osv / GHSA-q447-rj3r-2cgh
Advisory ID github_osv/GHSA-q447-rj3r-2cgh
Aliases CVE-2026-28478
Summary OpenClaw affected by denial of service via unbounded webhook request body buffering ### Summary Multiple webhook handlers accepted and buffered request bodies without a strict unified byte/time limit. A remote unauthenticated attacker could send oversized payloads and cause memory pressure, degrading availability. ### Details Affected packages: - `openclaw` (npm): `<2026.2.12` - `clawdbot` (npm): `<=2026.1.24-3` Root cause: - Webhook code paths buffered request payloads without consistent `maxBytes` + `timeoutMs` enforcement. - Some SDK-backed handlers parse request bodies internally and needed stream-level guards. Attack shape: - Send very large JSON payloads or slow/incomplete uploads to webhook endpoints. - Observe elevated memory usage and request handler pressure. ### Impact Remote unauthenticated availability impact (DoS) via request body amplification/memory pressure. ### Patch details (implemented) - Added shared bounded request-body helper in `src/infra/http-body.ts`. - Exported helper in `src/plugin-sdk/index.ts` for extension reuse. - Migrated webhook body readers to shared helper for: - LINE - Nextcloud Talk - Google Chat - Zalo - BlueBubbles - Nostr profile HTTP - Voice-call - Gateway hooks - Added stream guards for SDK handlers that parse request bodies internally: - Slack - Telegram - Feishu - Added explicit Express JSON body limit handling for MS Teams webhook path. - Standardized failure responses: - `413 Payload Too Large` - `408 Request Timeout` ### Tests - Added regression tests: - `src/infra/http-body.test.ts` - `src/line/monitor.read-body.test.ts` - `extensions/nextcloud-talk/src/monitor.read-body.test.ts` - Focused webhook/security test suite passes for patched paths. ### Remediation Upgrade to the first release containing this patch. ## Credits Thanks @vincentkoc for reporting.
Status Published
Exploitability 0.5
Weighted Severity 6.8
Risk 3.4
Affected and Fixed Packages Package Details
Introduced and Fixed Package Commit Patches Package Commit Patches Details
Weaknesses (1)
CWE-400 Uncontrolled Resource Consumption
System Score Found at
cvssv3.1 7.5 https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/02/GHSA-q447-rj3r-2cgh/GHSA-q447-rj3r-2cgh.json
generic_textual HIGH
Reference id Reference type URL
https://github.com/openclaw/openclaw
GHSA-q447-rj3r-2cgh https://github.com/openclaw/openclaw/security/advisories/GHSA-q447-rj3r-2cgh
No exploits are available.

No EPSS data available for this advisory.

Patch URL
There are no known patches.
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Found at https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/02/GHSA-q447-rj3r-2cgh/GHSA-q447-rj3r-2cgh.json
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none

Vector: SSVCv2/E:N/A:Y/T:P/P:M/B:A/M:M/D:T/2026-03-09T18:11:57Z/

Decision: Track

Source URL: https://github.com/cisagov/vulnrichment/blob/develop/2026/28xxx/CVE-2026-28478.json

Source Advisory: vulnrichment/CVE-2026-28478

View SSVC decision tree 
[{'Exploitation': 'none'},
 {'Automatable': 'yes'},
 {'Technical Impact': 'partial'},
 {'Mission Prevalence': 'minimal'},
 {'Public Well-being Impact': 'material'},
 {'Mission & Well-being': 'medium'}]