Description
xmlsec 1.2.23 and before is vulnerable to XML External Entity Expansion when parsing crafted input documents, resulting in possible information disclosure or denial of service
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | xmlsec1 | 1.2.24-1 | — |
| Debian 13 | xmlsec1 | 1.2.24-1 | — |
| Debian 12 | xmlsec1 | 1.2.24-1 | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro 16.04 LTS | xmlsec1 | 1.2.20-2ubuntu4+esm1 | USN-5674-1 |
| Ubuntu Pro 14.04 LTS | xmlsec1 | 1.2.18-2ubuntu1+esm1 | — |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 7 | xmlsec1 +9 | 1.2.20-7.el7_4 | RHSA-2017:2492 |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 7 | xmlsec1 +9 | 1.2.20-7.el7_4 | ELSA-2017-2492 |
Advisories 4
- RHSA-2017:2492 Red Hat Security Advisory: xmlsec1 security update Red Hat Security Advisories (RHSA) · Jun 26, 2026
- USN-5674-1 xmlsec1 vulnerability Ubuntu Security Notices (USN) · Jun 25, 2026
- WID-SEC-2023-1614 Tenable Security Nessus Network Monitor: Mehrere Schwachstellen BSI CERT-Bund (WID) · Oct 25, 2023
- ELSA-2017-2492 Moderate: xmlsec1 security update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · Aug 21, 2017
References
- RHSA-2017:2492 vendor-advisory
- FEDORA-2020-9573355ff4 vendor-advisory
- https://www.oracle.com/security-alerts/cpuApr2021.html
- https://github.com/lsh123/xmlsec/issues/43