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CVE-2026-63292— Apache HTTP Server: mod_vhost_alias stack overflow

Quick assessment

Affected
Apache Software Foundation Apache HTTP Server
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 HTTP Server（由 Apache 软件基金会开发）中 mod_vhost_alias 模块存在基于栈的缓冲区溢出漏洞，影响所有平台上的 Apache HTTP Server 2.4.68 及更早版本。当 VirtualDocumentRoot 使用主机名格式说明符，且 LimitRequestFieldSize 被设置为高于默认值时，远程攻击者可通过发送一个 Host 头长度超过 8192 字节的 HTTP 请求，导致拒绝服务（DoS）或潜在地执行任意代码。 建议用户升级至 2.4.69 版本

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I. Basic Information for CVE-2026-63292

Vulnerability Information
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Vulnerability Title
Apache HTTP Server: mod_vhost_alias stack overflow
Source: CVE Program / CVE List V5
Vulnerability Description
Stack-based buffer overflow in mod_vhost_alias in Apache Software Foundation Apache HTTP Server through 2.4.68 on all platforms allows a remote client to cause a denial of service or potentially execute arbitrary code via an HTTP request with a Host header exceeding 8192 bytes when VirtualDocumentRoot uses a hostname format specifier and LimitRequestFieldSize is raised above the default. Users are recommended to upgrade to version 2.4.69, which fixes this issue.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
栈缓冲区溢出
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Apache Software Foundation Apache HTTP Server 2.4.0 ~ 2.4.68 -

II. Public POCs for CVE-2026-63292

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III. Intelligence Information for CVE-2026-63292

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Vendor Advisories for CVE-2026-63292 (1)

Same Patch Batch · Apache Software Foundation · 2026-10-01 · 28 CVEs total

CVE-2026-88789 8.6 HIGH Apache Camel Quarkus: Camel Quarkus: Forced Xalan TransformerFactory drops upstream extern
CVE-2026-94250 8.2 HIGH Apache APISIX: Batch response aggregation can exhaust worker memory
CVE-2026-94212 6.4 MEDIUM Apache APISIX: unauthenticated impersonation issue in saml-auth
CVE-2026-94269 6.3 MEDIUM Apache APISIX: Servlet-style normalization creates a route/upstream authorization mismatch
CVE-2026-78242 5.7 MEDIUM Apache APISIX: data-mask may fail to redact request headers in logger output
CVE-2026-82806 5.3 MEDIUM Apache APISIX: cross-request permission pollution via static permission list mutation
CVE-2026-94276 5.1 MEDIUM Apache APISIX: Openid-connect introspection validation issue
CVE-2026-94220 2.1 LOW Apache APISIX: session fixation issue in feishu-auth and dingtalk-auth plugin
CVE-2026-56153 Apache HTTP Server: mod_charset_lite: Heap overflow in finish_partial_char
CVE-2026-42528 Apache HTTP Server: mod_dav shared lock overflow
CVE-2026-42356 Apache HTTP Server: limited RCE for some internal redirects to non-CGI files in CGI direct
CVE-2026-46729 Apache HTTP Server: mod_heartmonitor denial of service
CVE-2026-47360 Apache HTTP Server: mod_session: Session cookie not removed during internal redirect
CVE-2026-48005 Apache HTTP Server: mod_auth_digest reauthentication attack
CVE-2026-63686 Apache HTTP Server: mod_xml2enc crash on charset conversion failure
CVE-2026-56154 Apache HTTP Server: mod_rewrite use-after-free via %{LA-U:HTTP:...}
CVE-2026-56449 Apache HTTP Server: mod_proxy_html: crash in dump_content
CVE-2026-57941 Apache HTTP Server: mod_http2 use-after-free / wild write via shared session->bbtmp re-ent
CVE-2026-58415 Apache HTTP Server: mod_dav_fs property database read access
CVE-2026-59685 Apache HTTP Server: Out-of-Bounds Write in ap_directory_walk() Canonical-Name Rewrite on C

Showing top 20 of 28 CVEs. View all on vendor page → →

IV. Related Vulnerabilities

Same product: Apache HTTP Server
Same vendor: Apache Software Foundation
Same weakness: CWE-121

V. Comments for CVE-2026-63292

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