CVE-2026-56408: CWE-190 Integer Overflow or Wraparound in libexpat project libexpat
libexpat before 2.8.2 has an integer overflow in copyString.
AI Analysis
Technical Summary
CVE-2026-56408 is an integer overflow (CWE-190) vulnerability in the libexpat project affecting versions before 2.8.2. The issue occurs in the copyString function, where improper handling of integer values can cause overflow or wraparound. This can potentially lead to memory corruption or other unintended behavior impacting confidentiality and integrity of the system using the library. The vulnerability has a CVSS 3.1 base score of 6.9, indicating medium severity. No vendor advisory or patch information is currently available to confirm remediation status.
Potential Impact
The vulnerability can result in high impact on confidentiality and integrity, meaning an attacker could potentially manipulate or disclose sensitive data. The availability impact is low, indicating limited or no disruption to service. There are no known exploits in the wild at this time.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is released, users should monitor libexpat project communications for updates and consider applying any available workarounds or mitigations recommended by the vendor.
CVE-2026-56408: CWE-190 Integer Overflow or Wraparound in libexpat project libexpat
Description
libexpat before 2.8.2 has an integer overflow in copyString.
CVSS v3.1
Score 6.9medium
Affected software
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Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-56408 is an integer overflow (CWE-190) vulnerability in the libexpat project affecting versions before 2.8.2. The issue occurs in the copyString function, where improper handling of integer values can cause overflow or wraparound. This can potentially lead to memory corruption or other unintended behavior impacting confidentiality and integrity of the system using the library. The vulnerability has a CVSS 3.1 base score of 6.9, indicating medium severity. No vendor advisory or patch information is currently available to confirm remediation status.
Potential Impact
The vulnerability can result in high impact on confidentiality and integrity, meaning an attacker could potentially manipulate or disclose sensitive data. The availability impact is low, indicating limited or no disruption to service. There are no known exploits in the wild at this time.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is released, users should monitor libexpat project communications for updates and consider applying any available workarounds or mitigations recommended by the vendor.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- mitre
- Date Reserved
- 2026-06-21T15:51:10.930Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a380caeeed863c81e0981b0
Added to database: 06/21/2026, 16:09:18 UTC
Last enriched: 06/28/2026, 21:55:17 UTC
Last updated: 08/05/2026, 12:41:16 UTC
Views: 123
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