Advisory details:
github_osv / GHSA-j27p-hq53-9wgc
| Advisory ID | github_osv/GHSA-j27p-hq53-9wgc |
| Aliases |
CVE-2026-29609
|
| Summary | OpenClaw affected by denial of service via unbounded URL-backed media fetch ### Summary URL-backed media fetch handling allocated the entire response payload in memory (`arrayBuffer`) before enforcing `maxBytes`, allowing oversized responses to cause memory exhaustion. ### Affected Versions - `openclaw` (npm): < `2026.2.14` - `clawdbot` (npm): <= `2026.1.24-3` ### Patched Versions - `openclaw` (npm): `2026.2.14` ### Fix Commit - `openclaw/openclaw` `main`: `00a08908892d1743d1fc52e5cbd9499dd5da2fe0` ### Details Affected component: - `src/media/input-files.ts` (`fetchWithGuard`) When `content-length` is missing or incorrect, reading the body via `response.arrayBuffer()` buffers the full payload before a size check can run. ### Proof of Concept 1. Configure URL-based media input. 2. Serve a response larger than `maxBytes` (chunked transfer / no `content-length`). 3. Trigger the `fetchWithGuard` URL fetch path. Example local server (large response): ```bash node -e 'require("http").createServer((_,res)=>{res.writeHead(200,{"content-type":"application/octet-stream"});for(let i=0;i<1024;i++)res.write(Buffer.alloc(1024*64));res.end();}).listen(18888)' ``` ### Impact Availability loss via memory pressure from attacker-controlled remote media responses. ### Mitigation Until a patched release is available, disable URL-backed media inputs (or restrict to a tight hostname allowlist) and use conservative `maxBytes` limits. ### Credits Reported by @vincentkoc. |
| 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 |
| System | Score | Found at |
|---|---|---|
| cvssv3.1 | 7.5 | https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/02/GHSA-j27p-hq53-9wgc/GHSA-j27p-hq53-9wgc.json |
| generic_textual | HIGH |
| Reference id | Reference type | URL |
|---|---|---|
| https://github.com/openclaw/openclaw | ||
| https://github.com/openclaw/openclaw/commit/00a08908892d1743d1fc52e5cbd9499dd5da2fe0 | ||
| GHSA-j27p-hq53-9wgc | https://github.com/openclaw/openclaw/security/advisories/GHSA-j27p-hq53-9wgc |
No EPSS data available for this advisory.
| Patch URL | |
|---|---|
| There are no known patches. | |
| 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/2026-03-09T20:37:24Z/
Decision: Track
Source URL: https://github.com/cisagov/vulnrichment/blob/develop/2026/29xxx/CVE-2026-29609.json
Source Advisory: vulnrichment/CVE-2026-29609
[{'Exploitation': 'none'},
{'Automatable': 'yes'},
{'Technical Impact': 'partial'},
{'Mission Prevalence': 'minimal'},
{'Public Well-being Impact': 'material'},
{'Mission & Well-being': 'medium'}]