CVE-2026-32327— Apache Portable Runtime Utility: apr-util XML stack recursion crash
Quick assessment
Affected
Apache Software Foundation Apache Portable Runtime Utility
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.
Apache Portable Runtime Utility是美国Apache基金会开源的一个提供跨平台运行时接口的组件工具集。 Apache Portable Runtime Utility 1.6.3及之前版本存在资源管理错误漏洞，该漏洞源于解析不可信XML并调用apr_xml_quote_elem()函数时存在堆栈递归问题，可能导致堆栈递归攻击。
Possible ATT&CK Techniques 1 AI
T1200 · Hardware AdditionsAffected Version Matrix 1
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| Apache Software Foundation | Apache Portable Runtime Utility | ≤ 1.6.3 |
affected |
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I. Basic Information for CVE-2026-32327
Vulnerability Information
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Vulnerability Title
Apache Portable Runtime Utility: apr-util XML stack recursion crash
Source: CVE Program / CVE List V5
Vulnerability Description
A bug in APR-util version 1.6.3 (and earlier) allows a stack recursion attack against any library consumer which parses XML from untrusted sources and uses the apr_xml_quote_elem() function.
Users are recommended to upgrade to version 1.6.4, which fixes this issue.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
未经控制的递归
Source: CVE Program / CVE List V5
Vulnerability Title
Apache Portable Runtime Utility 资源管理错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Apache Portable Runtime Utility是美国Apache基金会开源的一个提供跨平台运行时接口的组件工具集。 Apache Portable Runtime Utility 1.6.3及之前版本存在资源管理错误漏洞，该漏洞源于解析不可信XML并调用apr_xml_quote_elem()函数时存在堆栈递归问题，可能导致堆栈递归攻击。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| Apache Software Foundation | Apache Portable Runtime Utility | 0 ~ 1.6.3 | - |
|
II. Public POCs for CVE-2026-32327
| # | POC Description | Source Link | Shenlong Link |
|---|
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Mailing List Discussions for CVE-2026-32327 (1)
Same Patch Batch · Apache Software Foundation · 2026-08-06 · 18 CVEs total
| CVE-2026-64640 | 5.3 MEDIUM | Apache Polaris: register endpoint reads attacker-controlled storage location before allowe |
| CVE-2026-68079 | Apache CXF: DefaultEncryptingCodeDataProvider allows unlimited authorization code replay | |
| CVE-2026-54225 | Apache CXF: Denial of Service attack via large attachments | |
| CVE-2026-57819 | Apache CXF: No default restriction on the amount of form parameters per message | |
| CVE-2026-64958 | Apache CXF: Denial of service via message header attachments | |
| CVE-2026-66909 | Apache CXF: Unsafe deserialization of inbound JMS ObjectMessage | |
| CVE-2026-57817 | Apache CXF: The authorization code hash (c_hash) is not enforced for the hybrid OIDC flow | |
| CVE-2026-65432 | Apache CXF: XXE via WSDL/XSD import parsing | |
| CVE-2026-68481 | Apache CXF: Revocation bypass in DefaultEncryptingOAuthDataProvider | |
| CVE-2025-49506 | Apache Portable Runtime Utility: apr_password_validate() vulnerable to timing attack | |
| CVE-2026-65583 | Apache CXF: Self-issued ID token claims validation skipped | |
| CVE-2026-63687 | Apache CXF: JwtRequestCodeFilter silently overrides outer PKCE and nonce parameters | |
| CVE-2026-61466 | Apache CXF: OAuth2 Dynamic Client Registration Scope Self-Escalation | |
| CVE-2026-57818 | Apache CXF: OAuth2 Authorization Code Replay via TOCTOU in JCacheCodeDataProvider | |
| CVE-2026-34502 | Apache Portable Runtime Utility: Heap buffer overflow in APR memcached client | |
| CVE-2026-34501 | Apache Portable Runtime Utility: Heap buffer overflow in APR redis client | |
| CVE-2026-34191 | Apache Portable Runtime Utility: SQL Injection in apr_dbd_oracle |
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V. Comments for CVE-2026-32327
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