Bug 2543288 (CVE-2026-102633)

Summary: CVE-2026-102633 expat: expat: Denial of Service via integer overflow in expat_realloc
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security <prodsec-ir-bot>
Status: NEW --- QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedCC: akhatavk, aos-team-art-private, asdas, dpaolell, gotiwari, jdelft, jhorak, jupierce, lgarciaa, mbiarnes, mvyas, ppalepu, ppostler, prdhamdh, rhel-process-autobot, sghai, sidsharm, suppawar, vlaad, watson-tool-maintainers
Target Milestone: ---Keywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in expat. On 32-bit systems, an integer overflow occurs within the expat_realloc memory allocation function when calculating buffer sizes. A remote attacker can exploit this vulnerability by supplying specially crafted XML input to an application that processes data with the library. Successful exploitation can lead to a Denial of Service (DoS) or memory corruption.
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Description OSIDB Bzimport 2026-09-29 16:45:05 UTC
libexpat versions 2.7.2 through 2.8.5 contain an integer overflow vulnerability in expat_realloc() function on 32-bit platforms when computing allocation sizes. Attackers supplying malicious XML to applications parsing with vulnerable libexpat can cause heap buffer overflow, memory corruption, or denial of service.