CVE-2026-32776: CWE-476 NULL Pointer Dereference in libexpat project libexpat
libexpat before 2.7.5 allows a NULL pointer dereference with empty external parameter entity content.
AI Analysis
Technical Summary
CVE-2026-32776 is a NULL pointer dereference vulnerability in the libexpat XML parsing library prior to version 2.7.5. It occurs when the library processes empty external parameter entity content, leading to a NULL pointer dereference and potential application crash or denial of service. The vulnerability is categorized under CWE-476 (NULL Pointer Dereference). The CVSS 3.1 base score is 4.0, indicating medium severity, with local attack vector, low complexity, no privileges required, no user interaction, and impact limited to availability. No known exploits have been reported. The vulnerability affects libexpat versions less than 2.7.5.
Potential Impact
The vulnerability can cause a denial of service by crashing applications that use vulnerable versions of libexpat when parsing crafted XML with empty external parameter entity content. There is no impact on confidentiality or integrity. No known active exploitation has been reported.
Mitigation Recommendations
Upgrade libexpat to version 2.7.5 or later, where this NULL pointer dereference issue is fixed. Since no official patch link is provided, rely on upgrading to the fixed version. No other mitigation or workaround is indicated.
CVE-2026-32776: CWE-476 NULL Pointer Dereference in libexpat project libexpat
Description
libexpat before 2.7.5 allows a NULL pointer dereference with empty external parameter entity content.
CVSS v3.1
Score 4.0medium
Affected software
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Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-32776 is a NULL pointer dereference vulnerability in the libexpat XML parsing library prior to version 2.7.5. It occurs when the library processes empty external parameter entity content, leading to a NULL pointer dereference and potential application crash or denial of service. The vulnerability is categorized under CWE-476 (NULL Pointer Dereference). The CVSS 3.1 base score is 4.0, indicating medium severity, with local attack vector, low complexity, no privileges required, no user interaction, and impact limited to availability. No known exploits have been reported. The vulnerability affects libexpat versions less than 2.7.5.
Potential Impact
The vulnerability can cause a denial of service by crashing applications that use vulnerable versions of libexpat when parsing crafted XML with empty external parameter entity content. There is no impact on confidentiality or integrity. No known active exploitation has been reported.
Mitigation Recommendations
Upgrade libexpat to version 2.7.5 or later, where this NULL pointer dereference issue is fixed. Since no official patch link is provided, rely on upgrading to the fixed version. No other mitigation or workaround is indicated.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- mitre
- Date Reserved
- 2026-03-16T06:54:19.802Z
- Cvss Version
- 3.1
- State
- PUBLISHED
Threat ID: 69b7af5b9d4df4518329b033
Added to database: 03/16/2026, 07:20:59 UTC
Last enriched: 07/15/2026, 11:22:48 UTC
Last updated: 07/31/2026, 19:22:58 UTC
Views: 156
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