Vulnerability · Published Oct 20, 2026 · Assigned by CPANSec
CVE-2026-113812Mozilla::CA versions before 20261020 for Perl provide a CA certificate bundle containing a root linked to compromised intermediates
Critical 9.1
In plain English
A critical-severity improper certificate validation in Mozilla-CA. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 27% of all known vulnerabilities).
Official description
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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:13 | libmozilla-ca-perl | no fix listed | DEBIAN-CVE-2026-113812 |
| Debian:14 | libmozilla-ca-perl | no fix listed | DEBIAN-CVE-2026-113812 |
| Ubuntu:24.04:LTS | libmozilla-ca-perl | no fix listed | UBUNTU-CVE-2026-113812 |
| Ubuntu:26.04:LTS | libmozilla-ca-perl | no fix listed | UBUNTU-CVE-2026-113812 |
| Ubuntu:26.10 | libmozilla-ca-perl | no fix listed | UBUNTU-CVE-2026-113812 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Mozilla-CA | 0 – before 20261020 |
Weakness: CWE-295 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
References
- https://www.openwall.com/lists/oss-security/2026/10/20/1 mailing-list
- https://metacpan.org/release/LWP/Mozilla-CA-20261020/changes release-notes
- https://emudhra.we-have-a-problem.com/ technical-description
- https://bugzilla.mozilla.org/show_bug.cgi?id=2083449 issue-tracking
- http://www.openwall.com/lists/oss-security/2026/10/20/36