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']

Show details on source website

JSON

To clipboard

{
  "cves": {
    "cve": {
      "cveNumber": "CVE-2026-41293",
      "cveUrl": "https://nvd.nist.gov/vuln/detail/CVE-2026-41293"
    }
  },
  "description": "Apache Tomcat\u662f\u4e00\u6b3e\u5f00\u6e90Java Web\u5e94\u7528\u670d\u52a1\u5668\uff0c\u7528\u4e8e\u8fd0\u884cServlet\u548cJSP\u5e94\u7528\u3002\n\nApache Tomcat\u5b58\u5728\u8f93\u5165\u9a8c\u8bc1\u9519\u8bef\u6f0f\u6d1e\u3002\u8be5\u6f0f\u6d1e\u4ea7\u751f\u7684\u539f\u56e0\u662fHTTP\u8bf7\u6c42\u89e3\u6790\u8def\u5f84\u4e2d\u9057\u7559\u7684\u8f93\u5165\u9a8c\u8bc1\u903b\u8f91\u672a\u88ab\u79fb\u9664\uff0c\u5bfc\u81f4\u5f02\u5e38\u8bf7\u6c42\u6570\u636e\u53ef\u8fdb\u5165\u4e0d\u5e94\u89e6\u53d1\u7684\u5904\u7406\u5206\u652f\u3002\u653b\u51fb\u8005\u53ef\u5229\u7528\u8be5\u6f0f\u6d1e\u63d0\u4ea4\u7279\u5236HTTP\u8bf7\u6c42\u5e76\u5f71\u54cd\u670d\u52a1\u5668\u8bf7\u6c42\u5904\u7406\u6d41\u7a0b\u3002",
  "formalWay": "\u5382\u5546\u5df2\u53d1\u5e03\u4e86\u6f0f\u6d1e\u4fee\u590d\u7a0b\u5e8f\uff0c\u8bf7\u53ca\u65f6\u5173\u6ce8\u66f4\u65b0\uff1a\r\nhttp://www.openwall.com/lists/oss-security/2026/05/12/13",
  "isEvent": "\u901a\u7528\u8f6f\u786c\u4ef6\u6f0f\u6d1e",
  "number": "CNVD-2026-21827",
  "openTime": "2026-05-20",
  "patchDescription": "Apache Tomcat\u662f\u4e00\u6b3e\u5f00\u6e90Java Web\u5e94\u7528\u670d\u52a1\u5668\uff0c\u7528\u4e8e\u8fd0\u884cServlet\u548cJSP\u5e94\u7528\u3002\r\n\r\nApache Tomcat\u5b58\u5728\u8f93\u5165\u9a8c\u8bc1\u9519\u8bef\u6f0f\u6d1e\u3002\u8be5\u6f0f\u6d1e\u4ea7\u751f\u7684\u539f\u56e0\u662fHTTP\u8bf7\u6c42\u89e3\u6790\u8def\u5f84\u4e2d\u9057\u7559\u7684\u8f93\u5165\u9a8c\u8bc1\u903b\u8f91\u672a\u88ab\u79fb\u9664\uff0c\u5bfc\u81f4\u5f02\u5e38\u8bf7\u6c42\u6570\u636e\u53ef\u8fdb\u5165\u4e0d\u5e94\u89e6\u53d1\u7684\u5904\u7406\u5206\u652f\u3002\u653b\u51fb\u8005\u53ef\u5229\u7528\u8be5\u6f0f\u6d1e\u63d0\u4ea4\u7279\u5236HTTP\u8bf7\u6c42\u5e76\u5f71\u54cd\u670d\u52a1\u5668\u8bf7\u6c42\u5904\u7406\u6d41\u7a0b\u3002\u76ee\u524d\uff0c\u4f9b\u5e94\u5546\u53d1\u5e03\u4e86\u5b89\u5168\u516c\u544a\u53ca\u76f8\u5173\u8865\u4e01\u4fe1\u606f\uff0c\u4fee\u590d\u4e86\u6b64\u6f0f\u6d1e\u3002",
  "patchName": "Apache Tomcat\u8f93\u5165\u9a8c\u8bc1\u9519\u8bef\u6f0f\u6d1e\uff08CNVD-2026-21827\uff09\u7684\u8865\u4e01",
  "products": {
    "product": [
      "Apache Tomcat \u003e=8.5.0\uff0c\u003c=8.5.100",
      "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"
    ]
  },
  "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: 2026-09-17 18:37

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 CNA under the mitre root

CNA scorecard B 76/100 over 1259 records in the last 180 days details

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

To clipboard

{
  "containers": {
    "adp": [
      {
        "providerMetadata": {
          "dateUpdated": "2026-05-12T17:40:57.407Z",
          "orgId": "af854a3a-2127-422b-91ae-364da2661108",
          "shortName": "CVE"
        },
        "references": [
          {
            "url": "http://www.openwall.com/lists/oss-security/2026/05/12/13"
          }
        ],
        "title": "CVE Program Container"
      },
      {
        "metrics": [
          {
            "cvssV3_1": {
              "attackComplexity": "LOW",
              "attackVector": "NETWORK",
              "availabilityImpact": "HIGH",
              "baseScore": 9.8,
              "baseSeverity": "CRITICAL",
              "confidentialityImpact": "HIGH",
              "integrityImpact": "HIGH",
              "privilegesRequired": "NONE",
              "scope": "UNCHANGED",
              "userInteraction": "NONE",
              "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
              "version": "3.1"
            }
          },
          {
            "other": {
              "content": {
                "id": "CVE-2026-41293",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "yes"
                  },
                  {
                    "Technical Impact": "total"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-05-14T16:40:13.006509Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-09-17T18:37:24.561Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Apache Tomcat",
          "vendor": "Apache Software Foundation",
          "versions": [
            {
              "lessThanOrEqual": "11.0.21",
              "status": "affected",
              "version": "11.0.0-M1",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "10.1.54",
              "status": "affected",
              "version": "10.1.0-M1",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "9.0.117",
              "status": "affected",
              "version": "9.0.0.M1",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "10.0.27",
              "status": "affected",
              "version": "10.0.0-M1",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "8.5.100",
              "status": "affected",
              "version": "8.5.0",
              "versionType": "semver"
            }
          ]
        }
      ],
      "credits": [
        {
          "lang": "en",
          "type": "finder",
          "value": "Dawit Jeong (@dawitngoliath)"
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "supportingMedia": [
            {
              "base64": false,
              "type": "text/html",
              "value": "\u003cp\u003eImproper Input Validation vulnerability in Apache Tomcat.\u003c/p\u003e\u003cp\u003eThis 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.\u003cbr\u003eOlder, end of support versions may also be affected.\u003c/p\u003e\u003cp\u003eUsers are recommended to upgrade to version [FIXED_VERSION], which fixes the issue.\u003c/p\u003e"
            }
          ],
          "value": "Improper Input Validation vulnerability in Apache Tomcat.\n\nThis 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.\nOlder, end of support versions may also be affected.\n\nUsers are recommended to upgrade to version [FIXED_VERSION], which fixes the issue."
        }
      ],
      "metrics": [
        {
          "other": {
            "content": {
              "text": "low"
            },
            "type": "Textual description of severity"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-20",
              "description": "CWE-20 Improper Input Validation",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-05-12T15:19:35.179Z",
        "orgId": "f0158376-9dc2-43b6-827c-5f631a4d8d09",
        "shortName": "apache"
      },
      "references": [
        {
          "tags": [
            "vendor-advisory"
          ],
          "url": "https://lists.apache.org/thread/qwg0q16z7xkb2qrr853wdll5531mvl1r"
        }
      ],
      "source": {
        "discovery": "EXTERNAL"
      },
      "title": "Apache Tomcat: HTTP/2 request headers not validated",
      "x_generator": {
        "engine": "Vulnogram 0.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "f0158376-9dc2-43b6-827c-5f631a4d8d09",
    "assignerShortName": "apache",
    "cveId": "CVE-2026-41293",
    "datePublished": "2026-05-12T15:19:35.179Z",
    "dateReserved": "2026-04-20T10:26:28.623Z",
    "dateUpdated": "2026-09-17T18:37:24.561Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

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.

Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

Order JSON

How durations are calculated

Following the VTEM framework (Black Hat USA 2015), time to patch starts when the vendor or a coordinator was informed, total time to patch at discovery, and disclosure to patch at public disclosure; vendor response time runs from the report to its acknowledgement. Time to exploit and time unpatched start at the earliest discovery or report, falling back to public disclosure. Unpatched time ends at the first recorded patch, or the calculation time when no patch is recorded. Exploitation to patch shows the interval between those two events; a published proof of concept is a public exploit, not exploitation.

Each result shows its source dates. A negative interval means the end event came first; when date-only inputs leave the order open, the result says so. Date-only inputs are approximate. The earliest evidence wins: KEV report dates and sightings are labelled as such. Records describing another vulnerability are listed but never calculated from, and a PoC alone does not establish exploitation. Missing patch evidence does not prove that no patch exists. Filters below change the event list only.

Publication & reservation Sightings KEV catalogs Other timestamps

Loading timeline…

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.

Action not permitted