CVE-2026-55535: PraisonAI PraisonAI Vulnerable To Server-Side Request Vulnerability

MODERATE
Advisory Identifier: GHSA-hmfx-4v44-9qw9
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CVSS 6.8
CWE-367 CWE-918
Published
Advisory Summary

CVE-2026-55535 is a MODERATE (CVSS 6.8) praisonai vulnerable to server-side request vulnerability (CWE-367: Time-of-check Time-of-use (TOCTOU) Race Condition) affecting PraisonAI libraries in the PyPI ecosystem. The issue involves praisonai vulnerable to server-side request forgery via dns rebinding bypass in webhook_url validation. Remediation is available by upgrading affected packages to version 4.6.58.

CVE-2026-55535 at a Glance

CVE Identifier CVE-2026-55535
GHSA Identifier GHSA-hmfx-4v44-9qw9
Severity MODERATE
CVSS v3.1 Base Score 6.8
CWE Classification CWE-367: Time-of-check Time-of-use (TOCTOU) Race Condition
Affected Product PraisonAI
Package Ecosystem PyPI
Published Date
Last Updated

Security Impact

CVSS: 6.8

The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:N/A:N).

Attack Vector Network (AV:N)
Attack Complexity High (AC:H)
Privileges Required None (PR:N)
User Interaction None (UI:N)
Scope Changed (S:C)
Confidentiality High (C:H)
Integrity None (I:N)
Availability None (A:N)

How to Fix CVE-2026-55535

To remediate this vulnerability, upgrade all affected PraisonAI dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

PraisonAI fixed: 4.6.58 
pip install PraisonAI>=4.6.58
Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release: 

pip show PraisonAI

How to Check if You Are Affected

To determine whether your Python environment is affected by CVE-2026-55535, inspect your installed packages using pip:

pip show PraisonAI

Analyze the terminal output to locate any version of PraisonAI in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 4.6.58), your application is affected.

Note: The pip show PraisonAI command checks currently installed packages in your active Python environment.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-367: Time-of-check Time-of-use (TOCTOU) Race Condition, where the product checks the state of a resource before using that resource, but the resource's state can change between the check and the use in a way that invalidates the results of the check. In PraisonAI, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.

Source Advisory Statement

### 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: ```python # 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: ```python # 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):** ```bash 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.

CVE-2026-55535 Affected PraisonAI Versions

1 component(s)
Fixed Versions:
4.6.58
Product / Package Ecosystem Affected Versions Fixed Version
PraisonAI
pypi/PraisonAI
PyPI
< 4.6.58
4.6.58

References

GitHub Advisory / Wiki ADVISORY
https://github.com/MervinPraison/PraisonAI/security/advisories/GHSA-hmfx-4v44-9qw9
Security Fix Commit FIX COMMIT
https://github.com/MervinPraison/PraisonAI/commit/2f9677abb2ea68eab864ee8b6a828fd0141612e1
PraisonAI Source Repository REPOSITORY
https://github.com/MervinPraison/PraisonAI
PraisonAI Release RELEASE
https://github.com/MervinPraison/PraisonAI/releases/tag/v4.6.58

Frequently Asked Questions

What is CVE-2026-55535?
CVE-2026-55535 is a security vulnerability in PraisonAI involving PraisonAI vulnerable to Server-Side Request Forgery via DNS rebinding bypass in webhook_url validation under CWE-367: Time-of-check Time-of-use (TOCTOU) Race Condition.
Which PraisonAI versions are affected?
Affected versions include releases prior to 4.6.58 across affected packages: PraisonAI.
What version fixes CVE-2026-55535?
Upgrading to 4.6.58 (or the latest patched release for your respective branch) resolves the vulnerability.
Is PraisonAI affected?
Yes, PraisonAI is affected in releases prior to 4.6.58. Upgrade your dependency to 4.6.58 or later.
What is the CVSS score of CVE-2026-55535?
CVE-2026-55535 has a CVSS v3.1 base score of 6.8 (MODERATE) with vector string CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:N/A:N.
What CWE is associated with CVE-2026-55535?
CVE-2026-55535 is classified under CWE-367: Time-of-check Time-of-use (TOCTOU) Race Condition (The product checks the state of a resource before using that resource, but the resource's state can change between the check and the use in a way that invalidates the results of the check.).
How can I check PyPI dependencies for CVE-2026-55535?
Run the dependency tree command: 'pip show PraisonAI'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.
Machine-readable OSV JSON OSV v1.5 Schema
Normalized schema output
View Raw JSON 
{
  "schema_version" : "1.4.0",
  "id" : "GHSA-hmfx-4v44-9qw9",
  "modified" : "2026-08-25T15:02:04Z",
  "published" : "2026-08-25T15:02:04Z",
  "aliases" : [ "CVE-2026-55535" ],
  "summary" : "PraisonAI vulnerable to Server-Side Request Forgery via DNS rebinding bypass in webhook_url validation",
  "details" : "### Summary\nThe `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.\n\n### Details\nThe validator catches `socket.gaierror` and silently allows the URL:\n\n```python\n# src/praisonai/praisonai/jobs/models.py:55\ntry:\n    ip = socket.gethostbyname(hostname)\n    ip_obj = ipaddress.ip_address(ip)\n    if ip_obj.is_private or ip_obj.is_loopback:\n        raise ValueError(\"private address\")\nexcept socket.gaierror:\n    pass  # BUG: DNS failure silently ignored → SSRF bypass\n```\n\nThe HTTP call is made later with no re-validation:\n\n```python\n# src/praisonai/praisonai/jobs/executor.py:402\nasync with httpx.AsyncClient() as client:\n    await client.post(job.webhook_url, ...)  # no second IP check\n```\n\n### Proof of Concept\n\n**DNS rebinding flow:**\n1. Register `attacker.com` with TTL=1s → resolves to `1.2.3.4` (public IP)\n2. Submit job: `webhook_url=http://attacker.com/callback`\n3. Validation passes (public IP)\n4. Switch DNS: `attacker.com` → `127.0.0.1`\n5. Job completes → server POSTs to `127.0.0.1` → internal SSRF\n\n**Unresolvable domain bypass (no DNS rebinding required):**\n\n```bash\ncurl -X POST http://:8005/api/v1/runs \\\n  -d '{\"prompt\":\"run\",\"webhook_url\":\"http://unresolvable.internal/cb\",\"agent_yaml\":\"...\"}'\n# Validation: gaierror → pass → URL accepted\n```\n\n### Impact\nSSRF to internal HTTP services: admin panels, databases, and cloud metadata APIs (e.g., `http://169.254.169.254/`). Exploitable without authentication.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:N/A:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "PyPI",
      "name" : "PraisonAI"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "4.6.58"
      } ]
    } ],
    "database_specific" : {
      "last_known_affected_version_range" : "<= 4.6.48"
    }
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/MervinPraison/PraisonAI/security/advisories/GHSA-hmfx-4v44-9qw9"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/MervinPraison/PraisonAI/commit/2f9677abb2ea68eab864ee8b6a828fd0141612e1"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/MervinPraison/PraisonAI"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/MervinPraison/PraisonAI/releases/tag/v4.6.58"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-367", "CWE-918" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-08-25T15:02:04Z",
    "nvd_published_at" : null
  }
}