---
id: "CVE-2026-113812"
kind: "vulnerability"
aliases: ["CVE-2026-113812"]
title: "Mozilla::CA Perl bundle trusts a root with publicly leaked intermediate keys"
severity: "medium"
cvss: null
epss: null
exploited: false
status: "open"
category: "package"
products: []
ecosystems: []
tags: ["mozilla-ca", "package", "perl", "tls-clients"]
not_affected_if: ["default-openssl-ca-path", "system-ca-store-in-use"]
published_at: "2026-10-20T22:19:30+00:00"
first_seen_at: "2026-10-23T21:57:25+00:00"
updated_at: "2026-10-25T05:04:11+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-113812", "first_seen_at": "2026-10-23T21:57:25+00:00"}]
---

# Mozilla::CA Perl bundle trusts a root with publicly leaked intermediate keys

Mozilla::CA versions before 20261020 ship a CA bundle containing the emSign ECC Root CA - G3, which chains to intermediate certificates whose private keys are publicly available. An attacker who can intercept or redirect client traffic could use those keys to impersonate a TLS server to affected Perl clients.

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

## How to check

- Run `perl -MMozilla::CA -e 'print $Mozilla::CA::VERSION'` or `cpanm --info Mozilla::CA` to read the installed version.
- Check which CA store the client uses: the sources say IO::Socket::SSL looks in OpenSSL default locations before falling back to Mozilla::CA, and that configuration and environment variables can override this.

## Fix

- Upgrade Mozilla::CA to `20261020` or later.
- If the client uses the system store, install the operating system vendor's CA updates for this incident.

## Timeline

- 2026-10-23T21:57:25+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-113812

## From the sources

Mozilla::CA versions before 20261020 for Perl provide a CA certificate bundle containing a root linked to compromised intermediates.

The bundle includes "emSign ECC Root CA - G3", which provides a trust path for intermediate certificates whose private keys are publicly available.

An attacker able to intercept or redirect client traffic may use these keys to impersonate a TLS server.

LWP, HTTP::Tiny and other clients normally use IO::Socket::SSL, which looks for CA certificates in OpenSSL's default locations before falling back to Mozilla::CA.

Configuration and environment variables can override this selection. Users should check which CA store their client uses. If it uses the system store, check for and install the operating system vendor's updates for this incident.

---

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