Vulnerability-Lookup

CNVD-2026-21827

Vulnerability from cnvd - Published: 2026-05-20

Title

Apache Tomcat输入验证错误漏洞（CNVD-2026-21827）

Description

Apache Tomcat是一款开源Java Web应用服务器，用于运行Servlet和JSP应用。 Apache Tomcat存在输入验证错误漏洞。该漏洞产生的原因是HTTP请求解析路径中遗留的输入验证逻辑未被移除，导致异常请求数据可进入不应触发的处理分支。攻击者可利用该漏洞提交特制HTTP请求并影响服务器请求处理流程。

Severity

高

Patch Name

Apache Tomcat输入验证错误漏洞（CNVD-2026-21827）的补丁

Patch Description

Formal description

厂商已发布了漏洞修复程序，请及时关注更新： http://www.openwall.com/lists/oss-security/2026/05/12/13

Reference

https://nvd.nist.gov/vuln/detail/CVE-2026-41293

Impacted products

Name
['Apache Tomcat >=8.5.0，<=8.5.100', 'Apache Tomcat >=9.0.0，<9.0.118', 'Apache Tomcat >=10.1.0，<10.1.55', 'Apache Tomcat >=11.0.0，<11.0.22', 'Apache Tomcat >=10.0.0，<=10.0.27']

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    "cve": {
      "cveNumber": "CVE-2026-41293",
      "cveUrl": "https://nvd.nist.gov/vuln/detail/CVE-2026-41293"
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  "number": "CNVD-2026-21827",
  "openTime": "2026-05-20",
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  "patchName": "Apache Tomcat\u8f93\u5165\u9a8c\u8bc1\u9519\u8bef\u6f0f\u6d1e\uff08CNVD-2026-21827\uff09\u7684\u8865\u4e01",
  "products": {
    "product": [
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      "Apache Tomcat \u003e=9.0.0\uff0c\u003c9.0.118",
      "Apache Tomcat \u003e=10.1.0\uff0c\u003c10.1.55",
      "Apache Tomcat \u003e=11.0.0\uff0c\u003c11.0.22",
      "Apache Tomcat \u003e=10.0.0\uff0c\u003c=10.0.27"
    ]
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  "referenceLink": "https://nvd.nist.gov/vuln/detail/CVE-2026-41293",
  "serverity": "\u9ad8",
  "submitTime": "2026-05-18",
  "title": "Apache Tomcat\u8f93\u5165\u9a8c\u8bc1\u9519\u8bef\u6f0f\u6d1e\uff08CNVD-2026-21827\uff09"
}

CVE-2026-41293 (GCVE-0-2026-41293)

Vulnerability from cvelistv5 – Published: 2026-05-12 15:19 – Updated: 2026-05-14 19:54

Title

Apache Tomcat: HTTP/2 request headers not validated

Summary

Improper Input Validation vulnerability in Apache Tomcat. This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.21, from 10.1.0-M1 through 10.1.54, from 9.0.0.M1 through 9.0.117, from 10.0.0-M1 through 10.0.27. Older, end of support versions may also be affected. Users are recommended to upgrade to version [FIXED_VERSION], which fixes the issue.

Severity

9.8 (Critical)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

SSVC

Exploitation: none Automatable: yes Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-05-14 16:40 UTC

CWE

CWE-20 - Improper Input Validation

Assigner

apache mitre root

References

2 references

URL	Tags
https://lists.apache.org/thread/qwg0q16z7xkb2qrr8…	vendor-advisory
http://www.openwall.com/lists/oss-security/2026/0…

Impacted products

1 product

Vendor	Product	Version
Apache Software Foundation	Apache Tomcat	Affected: 11.0.0-M1 , ≤ 11.0.21 (semver) Affected: 10.1.0-M1 , ≤ 10.1.54 (semver) Affected: 9.0.0.M1 , ≤ 9.0.117 (semver) Affected: 10.0.0-M1 , ≤ 10.0.27 (semver) Affected: 8.5.0 , ≤ 8.5.100 (semver)

Credits

Dawit Jeong (@dawitngoliath)

Show details on NVD website

JSON

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Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.