CVE-2026-56408: Integer Overflow
Published Jun 21, 2026
·Updated
Last updated 21 September 2026
Other sources
libexpat before 2.8.2 has an integer overflow in copyString.
— MITRE
Affected Software
3 affected componentsFixes available
Expat libexpat<2.8.2
Libexpat Project Libexpat<2.8.2
debian/expat<=2.5.0-1+deb12u2
2.5.0-1+deb12u32.8.3-1~deb13u12.8.4-12.8.4-2
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade
debian/expatto a version that resolves this vulnerability.Fixed in 2.5.0-1+deb12u3Fixed in 2.8.3-1~deb13u1Fixed in 2.8.4-1Fixed in 2.8.4-2 - Upgrade
Upgrade
libexpatto a version that resolves this vulnerability.Fixed in 2.8.2
Event History
Jun 21, 2026
CVE Published
via MITRE·03:51 PM
Data Sourced
via MITRE·03:51 PM
DescriptionSeverityWeakness
Data Sourced
via NVD·04:16 PM
RemedyDescriptionSeverityWeaknessAffected Software
Sep 21, 2026
Data Sourced
via Launchpad·06:54 PM
Description
Sep 22, 2026
Data Sourced
via Ubuntu·06:54 PM
RemedyDescriptionSeverityAffected Software
Data Sourced
via Debian·06:56 PM
DescriptionAffected Software
Frequently Asked Questions
1
What is the severity of CVE-2026-56408?
CVE-2026-56408 has a medium severity rating of 6.9.
2
What type of vulnerability is CVE-2026-56408?
CVE-2026-56408 is classified as an integer overflow vulnerability.
3
How does CVE-2026-56408 affect the Expat library?
CVE-2026-56408 can lead to potential memory corruption due to an integer overflow in the copyString function.
4
How do I fix CVE-2026-56408?
To fix CVE-2026-56408, upgrade to Expat version 2.8.2 or later where the vulnerability has been addressed.
5
Which software is impacted by CVE-2026-56408?
CVE-2026-56408 impacts the Expat library, specifically versions prior to 2.8.2.