# CVE-2026-61435: PraisonAI before 4.6.78 Authentication Bypass via Host Header Spoofing

> Remote attackers can bypass authentication and invoke agents by spoofing the Host header when authentication is disabled in configuration.

- **Severity:** High 8.8 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:H/VA:N/SC:N/SI:N/SA:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 15 Jul 2026
- **Updated:** 15 Jul 2026
- **Also known as:** CVE-2026-62174, GHSA-2gpf-2492-q9jh, PYSEC-2026-4247

## What is CVE-2026-61435?

CVE-2026-61435 is a high-severity authentication bypass vulnerability in MervinPraison PraisonAI, published on 15 Jul 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

PraisonAI before 4.6.78 contains an authentication bypass in the Call API agent invocation endpoints (src/praisonai/praisonai/api/agent_invoke.py) when PRAISONAI_CALL_AUTH=disabled is configured. The safeguard intended to restrict the disabled-auth opt-out to localhost binding derives the bind host from request.url.hostname, which is taken from the client-controlled HTTP Host header. A remote, unauthenticated attacker who can reach the service over the network can send a spoofed 'Host: 127.0.0.1' header to bypass the localhost-only restriction and list (GET /api/v1/agents) and invoke (POST /api/v1/agents/{agent_id}/invoke) registered agents without authentication.

Weakness: CWE-287 (Improper Authentication)

## Which versions are affected by CVE-2026-61435?

3 open source packages ship an affected version, including praisonai.


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `praisonai` | PyPI | All versions | 4.6.78 |
| `praisonai` | PyPI | All versions | 4.6.78 |
| `praisonai` | PyPI | All versions | 4.6.78 |

## How do I fix CVE-2026-61435?

Upgrade praisonai to 4.6.78 or later.

## Is CVE-2026-61435 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-61435 exists.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-61435 and fix it if it is affected.

What it is: CVE-2026-61435 is a high-severity authentication bypass vulnerability in MervinPraison PraisonAI, published on 15 Jul 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-61435 exists.

Affected packages and fixed versions:
- praisonai (PyPI): affected all versions; fixed in 4.6.78
- praisonai (PyPI): affected all versions; fixed in 4.6.78
- praisonai (PyPI): affected all versions; fixed in 4.6.78

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-61435/ (Markdown: https://insights.sbomify.com/CVE-2026-61435/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-61435
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-61435
- OSV: https://osv.dev/vulnerability/CVE-2026-61435

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-61435/
Summaries are generated and may contain mistakes; the official description above is the record.