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CVE-2026-102633— libexpat 2.7.2 through 2.8.5 Integer Overflow in expat_realloc

Quick assessment

Affected
libexpat libexpat
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

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 b

CVSS 5.9 · Medium

Affected Version Matrix 1

VendorProduct Version RangeStatus
libexpat libexpat 2.7.2≤ 2.8.5 affected
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I. Basic Information for CVE-2026-102633

Vulnerability Information

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Vulnerability Title
libexpat 2.7.2 through 2.8.5 Integer Overflow in expat_realloc
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
整数溢出或超界折返
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
libexpat libexpat 2.7.2 ~ 2.8.5 -

II. Public POCs for CVE-2026-102633

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III. Intelligence Information for CVE-2026-102633

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Patches & Fixes for CVE-2026-102633 (2)

Vendor Pages for CVE-2026-102633 (1)

Other References for CVE-2026-102633 (1)

Other References for CVE-2026-102633 (1)

IV. Related Vulnerabilities

Same product: libexpat
Same vendor: libexpat
Same weakness: CWE-190

V. Comments for CVE-2026-102633

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