CVE-2026-63686— Apache HTTP Server: mod_xml2enc crash on charset conversion failure
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 2.4.69 之前版本中，mod_xml2enc 模块存在空指针解引用漏洞。该漏洞存在于所有平台，允许不受信任的后端服务器通过代理响应触发拒绝服务（DoS）攻击：当响应中的字符集转换部分成功随后失败时，即可触发此漏洞。 建议用户升级至 2.4.69 版本以修复该问题。
Possible ATT&CK Techniques 1 AI
T1499 · Endpoint Denial of Service
Get alerts for future matching vulnerabilities
Log in to subscribe
I. Basic Information for CVE-2026-63686
Vulnerability Information
Have questions about the vulnerability? See if Shenlong's analysis helps!
View Shenlong Deep Dive ↗
Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.
Vulnerability Title
Apache HTTP Server: mod_xml2enc crash on charset conversion failure
Source: CVE Program / CVE List V5
Vulnerability Description
A NULL pointer dereference in mod_xml2enc in Apache Software Foundation Apache HTTP Server before 2.4.69 on all platforms allows an untrusted backend server to cause a denial of service via a proxied response with a charset whose conversion partially succeeds then fails.
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
空指针解引用
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-2026-63686
| # | POC Description | Source Link | Shenlong Link |
|---|
AI-Generated POC
Premium
No public POC found.
Login to generate AI POCIII. Intelligence Information for CVE-2026-63686
请登录查看更多情报信息。
Vendor Advisories for CVE-2026-63686 (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-2026-93546 | Apache HTTP Server: mod_dav_fs namespace overflow | |
| 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
-
CVE-2026-93546
Apache HTTP Server: mod_dav_fs namespace overflow -
CVE-2026-79768
Apache HTTP Server: mod_userdir information disclosure -
CVE-2026-73637
Apache HTTP Server: mod_auth_digest DoS attack -
CVE-2026-73636
Apache HTTP Server: mod_auth_digest one-time-nonce replay at -
CVE-2026-63718
Apache HTTP Server: mod_proxy_uwsgi Transfer-Encoding respon
Same vendor: Apache Software Foundation
-
CVE-2026-94644
Apache Thrift: PHP `TJSONProtocol` string/number readers hav -
CVE-2026-94645
Apache Thrift: Node.js `TJSONProtocol` uses a peer-declared -
CVE-2026-94650
Apache Thrift: c_glib generated struct readers have no recur -
CVE-2026-94651
Apache Thrift: Java `TSaslNonblockingServer` `Computation.ru -
CVE-2026-85483
Apache Thrift: c_glib TZlibTransport reports a full read aft
Same weakness: CWE-476
V. Comments for CVE-2026-63686
No comments yet