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GHSA-j27p-hq53-9wgc

HighCVSS 7.5 / 10
Published Feb 18, 2026·Last modified Mar 16, 2026
Affected Components(0)

No affected components available

Description

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):

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.

Risk Scores
Base Score
7.5

The vulnerability can be exploited over the network without needing physical access. It is easy for an attacker to exploit this vulnerability. An attacker does not need any special privileges or access rights. No user interaction is needed for the attacker to exploit this vulnerability. The impact is confined to the system where the vulnerability exists. There is a high impact on the availability of the system.

Threat Intelligence
6.9

Exploitation attempts have been detected. Elevated vigilance and prompt remediation are advised.

EPSS
0.43%

The exploit probability is very low. The vulnerability is unlikely to be exploited in the next 30 days.

Exploit
Not available

We did not find any exploit available. Neither in GitHub repositories nor in the Exploit-Database.

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