CVE-2021-21348: XStream is vulnerable to an attack using Regular Expression for a Denial of Service (ReDos)
Last updated 22 August 2024
Other sources
XStream is a Java library to serialize objects to XML and back again. In XStream before version 1.4.16, there is a vulnerability which may allow a remote attacker to occupy a thread that consumes maximum CPU time and will never return. No user is affected, who followed the recommendation to setup XStream's security framework with a whitelist limited to the minimal required types. If you rely on XStream's default blacklist of the Security Framework, you will have to use at least version 1.4.16.
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade
debian/libxstream-javato a version that resolves this vulnerability.Fixed in 1.4.15-3+deb11u2Fixed in 1.4.15-3+deb11u3Fixed in 1.4.20-1+deb12u1Fixed in 1.4.21-1 - Upgrade
Upgrade
redhat/xstreamto a version that resolves this vulnerability.Fixed in 1.4.16 - Upgrade
Upgrade
XStreamto a version that resolves this vulnerability.Fixed in 1.4.16 - Configuration
Configure XStream's security framework with a whitelist limited to the minimal required types.
XStream Security Framework whitelist = minimal required types
Event History
Parent advisories
This vulnerability appears in the following advisories.
Frequently Asked Questions
What is CVE-2021-21348?
CVE-2021-21348 is a vulnerability in the XStream Java library that allows a remote attacker to consume maximum CPU time.
How does CVE-2021-21348 affect users?
Users who have not updated to XStream version 1.4.16 are affected by CVE-2021-21348.
What is the severity of CVE-2021-21348?
CVE-2021-21348 has a severity level of 7.5 (High).
How can I fix CVE-2021-21348?
To fix CVE-2021-21348, users should update to XStream version 1.4.16 or above.
Where can I find more information about CVE-2021-21348?
You can find more information about CVE-2021-21348 in the references provided: [GitHub Advisory](https://github.com/x-stream/xstream/security/advisories/GHSA-56p8-3fh9-4cvq), [XStream Advisory](https://x-stream.github.io/CVE-2021-21348.html), [Red Hat Bugzilla](https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=1942634).