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CVE-2026-113351— libexpat 2.7.2 through 2.9.0 Denial of Service via XML_ParserReset

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 2.7.2 至 2.9.0 版本中存在一个拒绝服务（DoS）漏洞。该漏洞源于 函数在重置解析器时会将直接字节计数清零，却未相应地调整已跟踪的堆分配偏移量。攻击者可提交一个大型 XML 文档，导致后续在同一重置后的解析器上处理的文档因触发 错误而失败，除非重新创建该解析器。

CVSS 5.9 · Medium EPSS 0.47% · P40

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service

Affected Version Matrix 1

VendorProduct Version RangeStatus
libexpat libexpat 2.7.2≤ 2.9.0 affected
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I. Basic Information for CVE-2026-113351

Vulnerability Information
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Vulnerability Title
libexpat 2.7.2 through 2.9.0 Denial of Service via XML_ParserReset
Source: CVE Program / CVE List V5
Vulnerability Description
libexpat 2.7.2 through 2.9.0 contains a denial of service vulnerability because XML_ParserReset zeroes the direct byte count but never offsets tracked heap allocations. Attackers can submit a large XML document so later documents on the same reset parser fail with XML_ERROR_NO_MEMORY until it is recreated.
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
资源初始化缺失
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
libexpat libexpat 2.7.2 ~ 2.9.0 -

II. Public POCs for CVE-2026-113351

# POC Description Source Link Shenlong Link
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III. Intelligence Information for CVE-2026-113351

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Patches & Fixes for CVE-2026-113351 (1)

Vendor Advisories for CVE-2026-113351 (1)

Vendor Pages for CVE-2026-113351 (1)

Other References for CVE-2026-113351 (2)

IV. Related Vulnerabilities

Same product: libexpat
Same vendor: libexpat
Same weakness: CWE-909