---
id: "CVE-2026-50787"
kind: "vulnerability"
aliases: ["CVE-2026-50787"]
title: "e-SIC Livre: CAPTCHA endpoint lets remote users exhaust server memory and CPU"
severity: "medium"
cvss: null
epss: 0.0026
exploited: false
status: "open"
category: "package"
products: []
ecosystems: []
tags: ["e-sic-livre", "package", "php", "self-hosted"]
not_affected_if: ["newer-version"]
published_at: "2026-10-23T16:16:51+00:00"
first_seen_at: "2026-10-23T21:57:34+00:00"
updated_at: "2026-10-25T12:38:49+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-50787", "first_seen_at": "2026-10-23T21:57:34+00:00"}, {"source": "epss", "url": "https://api.first.org/data/v1/epss?cve=CVE-2026-50787", "first_seen_at": "2026-10-25T12:38:49+00:00"}]
---

# e-SIC Livre: CAPTCHA endpoint lets remote users exhaust server memory and CPU

e-SIC Livre v0.2.2 and earlier takes unchecked parameters (l, a, tf, ql) in restrito/inc/captcha.php to size CAPTCHA images. A remote attacker can send oversized values to make the server consume excessive memory and CPU, causing denial of service.

_Summary, check and fix written by a model from the sources; labelled as such._

## How to check

- Look for `restrito/inc/captcha.php` in the e-SIC Livre install and confirm the installed version with the project's version file
- unknown

## Fix

- unknown

## Timeline

- 2026-10-23T21:57:34+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-50787
- 2026-10-25T12:38:49+00:00 epss https://api.first.org/data/v1/epss?cve=CVE-2026-50787

## From the sources

e-SIC Livre (esiclivre) v0.2.2 and earlier contains an uncontrolled resource consumption vulnerability in restrito/inc/captcha.php. The application uses user-supplied parameters (l, a, tf, ql) without validation to generate CAPTCHA images, allowing remote attackers to cause denial of service via excessive memory and CPU consumption.

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_Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai_