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PYSEC-2026-3890

MediumCVSS 6.8 / 10
Published Sep 10, 2026·Last modified Sep 10, 2026
Affected Components(1)
PyPI logopraisonai
< 4.6.58
Description

Summary

The webhook_url field in the Jobs API silently passes validation when DNS resolution fails (socket.gaierror), enabling DNS rebinding attacks. An attacker's domain can initially resolve to a public IP (passing validation) then switch to an internal IP before the server makes the HTTP request.

Details

The validator catches socket.gaierror and silently allows the URL:

# src/praisonai/praisonai/jobs/models.py:55
try:
    ip = socket.gethostbyname(hostname)
    ip_obj = ipaddress.ip_address(ip)
    if ip_obj.is_private or ip_obj.is_loopback:
        raise ValueError("private address")
except socket.gaierror:
    pass  # BUG: DNS failure silently ignored → SSRF bypass

The HTTP call is made later with no re-validation:

# src/praisonai/praisonai/jobs/executor.py:402
async with httpx.AsyncClient() as client:
    await client.post(job.webhook_url, ...)  # no second IP check

Proof of Concept

DNS rebinding flow:

  1. Register attacker.com with TTL=1s → resolves to 1.2.3.4 (public IP)
  2. Submit job: webhook_url=http://attacker.com/callback
  3. Validation passes (public IP)
  4. Switch DNS: attacker.com → 127.0.0.1
  5. Job completes → server POSTs to 127.0.0.1 → internal SSRF

Unresolvable domain bypass (no DNS rebinding required):

curl -X POST http://:8005/api/v1/runs \
  -d '{"prompt":"run","webhook_url":"http://unresolvable.internal/cb","agent_yaml":"..."}'
# Validation: gaierror → pass → URL accepted

Impact

SSRF to internal HTTP services: admin panels, databases, and cloud metadata APIs (e.g., http://169.254.169.254/). Exploitable without authentication.

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Risk Scores
Base Score
6.8

The vulnerability can be exploited over the network without needing physical access. It is difficult for an attacker to exploit this vulnerability and may require special conditions. An attacker does not need any special privileges or access rights. No user interaction is needed for the attacker to exploit this vulnerability. The vulnerability can affect other systems as well, not just the initial system. There is a high impact on the confidentiality of the information.

Threat Intelligence
6.2

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

EPSS
0.34%

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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