CVE-2026-55537 PraisonAI: Webhook SSRF via DNS fail-open in `JobSubmitRequest.validate_webhook_url()` — bypass of CVE-2026-40114
An attacker can exploit DNS fail-open logic to bypass webhook URL validation, enabling Server-Side Request Forgery against internal services.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-55537?
CVE-2026-55537 is a high-severity server-side request forgery vulnerability in MervinPraison PraisonAI, published on 25 Aug 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
PraisonAI is a multi-agent teams system. Prior to praisonai 4.6.58, JobSubmitRequest.validate_webhook_url() accepts webhook_url when resolution raises socket.gaierror because the exception path uses except socket.gaierror: pass. JobExecutor._send_webhook() later performs a fresh lookup, allowing DNS changes to direct the request to an internal service. This issue is fixed in version 4.6.58.
Which versions are affected by CVE-2026-55537?
3 open source packages ship an affected version, including praisonai and PraisonAI.
| Package | Affected | Fixed in |
|---|---|---|
praisonai PyPI | All versions | 4.6.58 |
praisonai PyPI | All versions | 4.6.58 |
PraisonAI PyPI | All versions | 4.6.58 |
How do I fix CVE-2026-55537?
Upgrade praisonai to 4.6.58 or later.
Upgrade, and send outbound requests through an allow-list that blocks internal addresses. More about Server-side request forgery.
Is CVE-2026-55537 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-55537 exists.
Sources
Also known as GHSA-rg5q-pp8p-f7jm, PYSEC-2026-3895.