Vulnerability-Lookup

CVE-2026-42536 (GCVE-0-2026-42536)

Vulnerability from cvelistv5 – Published: 2026-06-08 15:23 – Updated: 2026-09-14 12:04

Title

Apache HTTP Server: mod_xml2enc heap overflow

Summary

Heap-based Buffer Overflow vulnerability in Apache HTTP Server with mod_xml2enc, xml2StartParse, and untrusted content This issue affects Apache HTTP Server: from 2.4.0 through 2.4.67. Users are recommended to upgrade to version 2.4.68, which fixes the issue.

Severity

7.5 (High)


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

SSVC

Exploitation: none Automatable: yes Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-06-08 18:09 UTC

CWE

CWE-122 - Heap-based Buffer Overflow
CWE-120 - Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')

Assigner

apache mitre root

References

16 references

URL	Tags
https://httpd.apache.org/security/vulnerabilities…	vendor-advisory
http://www.openwall.com/lists/oss-security/2026/06/08/9
https://access.redhat.com/security/cve/CVE-2026-42536	vdb-entryx_refsource_REDHAT
https://bugzilla.redhat.com/show_bug.cgi?id=2486411	issue-trackingx_refsource_REDHAT
https://security.access.redhat.com/data/csaf/v2/v…	x_sadp-csaf-vex
https://access.redhat.com/errata/RHSA-2026:56868	vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:47046	vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:34109	vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:42828	vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:67152	vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:66323	vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:62165	vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:41906	vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:25042	vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:53371	vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:56869	vendor-advisoryx_refsource_REDHAT

Impacted products

18 products

Vendor	Product	Version	CPE status
Apache Software Foundation	Apache HTTP Server	Affected: 2.4.0 , ≤ 2.4.67 (semver)	guessed
Red Hat	JBoss Core Services for RHEL 8	Unaffected: 0:2.4.62-16.el8jbcs , < * (rpm) cpe:/a:redhat:jboss_core_services:1::el8
Red Hat	JBoss Core Services for RHEL 8	Unaffected: 0:2.0.29-13.el8jbcs , < * (rpm) cpe:/a:redhat:jboss_core_services:1::el8
Red Hat	JBoss Core Services for RHEL 8	Unaffected: 0:1.2.50-17.redhat_1.el8jbcs , < * (rpm) cpe:/a:redhat:jboss_core_services:1::el8
Red Hat	JBoss Core Services for RHEL 8	Unaffected: 1:2.4.28-19.el8jbcs , < * (rpm) cpe:/a:redhat:jboss_core_services:1::el8
Red Hat	JBoss Core Services for RHEL 8	Unaffected: 0:1.3.22-12.el8jbcs , < * (rpm) cpe:/a:redhat:jboss_core_services:1::el8
Red Hat	JBoss Core Services for RHEL 8	Unaffected: 0:2.9.6-19.el8jbcs , < * (rpm) cpe:/a:redhat:jboss_core_services:1::el8
Red Hat	Red Hat Enterprise Linux 10	Unaffected: 0:2.4.63-13.el10_2.4 , < * (rpm) cpe:/o:redhat:enterprise_linux:10.2
Red Hat	Red Hat Enterprise Linux 10.0 Extended Update Support	Unaffected: 0:2.4.63-1.el10_0.4 , < * (rpm) cpe:/o:redhat:enterprise_linux_eus:10.0
Red Hat	Red Hat Enterprise Linux 8	Unaffected: 8100020260714175253.489197e6 , < * (rpm) cpe:/a:redhat:enterprise_linux:8
Red Hat	Red Hat Enterprise Linux 9	Unaffected: 0:2.4.62-13.el9_8.5 , < * (rpm) cpe:/a:redhat:enterprise_linux:9
Red Hat	Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions	Unaffected: 0:2.4.57-11.el9_4.5 , < * (rpm) cpe:/a:redhat:rhel_e4s:9.4
Red Hat	Red Hat Enterprise Linux 9.6 Extended Update Support	Unaffected: 0:2.4.62-4.el9_6.6 , < * (rpm) cpe:/a:redhat:rhel_eus:9.6
Red Hat	Red Hat JBoss Core Services 2.4.62.SP5	Unaffected: httpd24-httpd , < * (rpm) cpe:/a:redhat:jboss_core_services:1
Red Hat	Red Hat Hardened Images	Unaffected: 2.4.68-1.hum1 , < * (rpm) cpe:/a:redhat:hummingbird:1
Red Hat	Red Hat Insights proxy 1.5	Unaffected: 1786433656 , < * (rpm) cpe:/a:redhat:insights_proxy:1.5::el9
Red Hat	Red Hat Enterprise Linux 6	cpe:/o:redhat:enterprise_linux:6
Red Hat	Red Hat Enterprise Linux 7	cpe:/o:redhat:enterprise_linux:7

Credits

Zhenpeng (Leo) Lin at depthfirst

Show details on NVD website

JSON

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\"time\": \"2026-06-08T16:02:19.284Z\", \"value\": \"Reported to Red Hat.\"}, {\"lang\": \"en\", \"time\": \"2026-06-08T15:23:46.290Z\", \"value\": \"Made public.\"}], \"solutions\": [{\"lang\": \"en\", \"value\": \"RHSA-2026:56868: Red Hat JBoss Core Services on RHEL 8\"}, {\"lang\": \"en\", \"value\": \"RHSA-2026:47046: Red Hat Enterprise Linux AppStream EUS (v. 10.0)\"}, {\"lang\": \"en\", \"value\": \"RHSA-2026:34109: Red Hat Enterprise Linux AppStream (v. 10)\"}, {\"lang\": \"en\", \"value\": \"RHSA-2026:42828: Red Hat Enterprise Linux AppStream (v. 8)\"}, {\"lang\": \"en\", \"value\": \"RHSA-2026:67152: Red Hat Enterprise Linux AppStream E4S (v.9.2)\"}, {\"lang\": \"en\", \"value\": \"RHSA-2026:66323: Red Hat Enterprise Linux AppStream E4S (v.9.4)\"}, {\"lang\": \"en\", \"value\": \"RHSA-2026:62165: Red Hat Enterprise Linux AppStream EUS (v.9.6)\"}, {\"lang\": \"en\", \"value\": \"RHSA-2026:41906: Red Hat Enterprise Linux AppStream (v. 9)\"}, {\"lang\": \"en\", \"value\": \"RHSA-2026:25042: Red Hat Hardened Images\"}, {\"lang\": \"en\", \"value\": \"RHSA-2026:53371: Red Hat Insights proxy 1.5\"}, {\"lang\": \"en\", \"value\": \"RHSA-2026:56869: Red Hat JBoss Core Services 2.4.62.SP5\"}], \"x_adpType\": \"supplier\", \"datePublic\": \"2026-06-08T15:23:46.290Z\", \"references\": [{\"url\": \"https://access.redhat.com/security/cve/CVE-2026-42536\", \"tags\": [\"vdb-entry\", \"x_refsource_REDHAT\"]}, {\"url\": \"https://bugzilla.redhat.com/show_bug.cgi?id=2486411\", \"name\": \"RHBZ#2486411\", \"tags\": [\"issue-tracking\", \"x_refsource_REDHAT\"]}, {\"url\": \"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-42536.json\", \"tags\": [\"x_sadp-csaf-vex\"]}, {\"url\": \"https://access.redhat.com/errata/RHSA-2026:56868\", \"tags\": [\"vendor-advisory\", \"x_refsource_REDHAT\"]}, {\"url\": \"https://access.redhat.com/errata/RHSA-2026:47046\", \"tags\": [\"vendor-advisory\", \"x_refsource_REDHAT\"]}, {\"url\": 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\"https://access.redhat.com/errata/RHSA-2026:56869\", \"tags\": [\"vendor-advisory\", \"x_refsource_REDHAT\"]}], \"workarounds\": [{\"lang\": \"en\", \"value\": \"To mitigate this vulnerability, disable the `mod_xml2enc` module if its functionality for XML internationalization is not essential. This can be done by commenting out the `LoadModule xml2enc_module modules/mod_xml2enc.so` directive in the Apache HTTP Server configuration. A service restart is required for the change to take effect.\\n\\n```bash\\n# Edit the Apache configuration file, e.g., /etc/httpd/conf.modules.d/00-base.conf\\n# Comment out the line:\\n# LoadModule xml2enc_module modules/mod_xml2enc.so\\n\\n# Reload the httpd service\\nsudo systemctl reload httpd\\n```\\n\\n*Note: Disabling `mod_xml2enc` will cause any configurations relying heavily on `mod_proxy_html` or raw HTML/XML encoding conversions to function incorrectly or fail. Red Hat strongly recommends upgrading to a patched version of `httpd` as soon as it becomes available for your specific RHEL channel.*\"}], \"x_generator\": {\"engine\": \"sadp-cli 1.0.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"A flaw was found in Apache HTTP Server, specifically within the mod_xml2enc module. 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      "cveMetadata": "{\"cveId\": \"CVE-2026-42536\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-09-14T12:04:32.084Z\", \"dateReserved\": \"2026-04-28T16:06:25.760Z\", \"assignerOrgId\": \"f0158376-9dc2-43b6-827c-5f631a4d8d09\", \"datePublished\": \"2026-06-08T15:23:46.290Z\", \"assignerShortName\": \"apache\"}",
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}

RHSA-2026:41906

Vulnerability from csaf_redhat - Published: 2026-07-20 06:49 - Updated: 2026-09-14 05:28

Summary

Red Hat Security Advisory: httpd security, bug fix, and enhancement update

Severity

Important

Scope

13 vulnerabilities in this advisory, including CVE-2026-42536.

CVE-2026-42536

A flaw was found in Apache HTTP Server, specifically within the mod_xml2enc module. This heap-based buffer overflow vulnerability can be triggered when processing untrusted content through the xml2StartParse function. A remote attacker could potentially exploit this to cause a denial of service, information disclosure, or possibly arbitrary code execution.

7.5 (High)


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

Fixed: 75 products

https://access.redhat.com/errata/RHSA-2026:41906

Open the full advisory

RHSA-2026:42828

Vulnerability from csaf_redhat - Published: 2026-07-21 16:02 - Updated: 2026-09-14 05:28

Summary

Red Hat Security Advisory: httpd:2.4 security, bug fix, and enhancement update

Severity

Important

Scope

9 vulnerabilities in this advisory, including CVE-2026-42536.

CVE-2026-42536

7.5 (High)


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

Fixed: 85 products

https://access.redhat.com/errata/RHSA-2026:42828

Open the full advisory

RHSA-2026:47046

Vulnerability from csaf_redhat - Published: 2026-07-28 09:07 - Updated: 2026-09-14 05:28

Summary

Red Hat Security Advisory: httpd security update

Severity

Important

Scope

12 vulnerabilities in this advisory, including CVE-2026-42536.

CVE-2026-42536

7.5 (High)


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

Fixed: 75 products

https://access.redhat.com/errata/RHSA-2026:47046

Open the full advisory

RHSA-2026:53371

Vulnerability from csaf_redhat - Published: 2026-08-11 09:08 - Updated: 2026-09-14 11:48

Summary

Red Hat Security Advisory: Insights proxy Container Image

Severity

Important

Scope

35 vulnerabilities in this advisory, including CVE-2026-42536.

CVE-2026-42536

7.5 (High)


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

Fixed: 2 products

https://access.redhat.com/errata/RHSA-2026:53371

Open the full advisory

RHSA-2026:56868

Vulnerability from csaf_redhat - Published: 2026-08-19 13:34 - Updated: 2026-09-14 05:28

Summary

Red Hat Security Advisory: Red Hat JBoss Core Services Apache HTTP Server 2.4.62 SP5 security update

Severity

Important

Scope

15 vulnerabilities in this advisory, including CVE-2026-42536.

CVE-2026-42536

7.5 (High)


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

Fixed: 31 products

https://access.redhat.com/errata/RHSA-2026:56868

Open the full advisory

RHSA-2026:56869

Vulnerability from csaf_redhat - Published: 2026-08-19 13:28 - Updated: 2026-09-15 13:24

Summary

Red Hat Security Advisory: Red Hat JBoss Core Services Apache HTTP Server 2.4.62 SP5 security update

Severity

Important

Scope

30 vulnerabilities in this advisory, including CVE-2026-42536.

CVE-2026-42536

7.5 (High)


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

Fixed: 1 product

https://access.redhat.com/errata/RHSA-2026:56869

Open the full advisory

RHSA-2026:62165

Vulnerability from csaf_redhat - Published: 2026-09-01 17:54 - Updated: 2026-09-14 05:28

Summary

Red Hat Security Advisory: httpd security update

Severity

Important

Scope

15 vulnerabilities in this advisory, including CVE-2026-42536.

CVE-2026-42536

7.5 (High)


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

Fixed: 75 products

https://access.redhat.com/errata/RHSA-2026:62165

Open the full advisory

RHSA-2026:66323

Vulnerability from csaf_redhat - Published: 2026-09-10 06:09 - Updated: 2026-09-14 05:28

Summary

Red Hat Security Advisory: httpd security update

Severity

Important

Scope

15 vulnerabilities in this advisory, including CVE-2026-42536.

CVE-2026-42536

7.5 (High)


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

Fixed: 5 products Known not affected: 70 products

https://access.redhat.com/errata/RHSA-2026:66323

Open the full advisory

RHSA-2026:67152

Vulnerability from csaf_redhat - Published: 2026-09-14 05:09 - Updated: 2026-09-14 23:53

Summary

Red Hat Security Advisory: httpd security update

Severity

Important

Scope

15 vulnerabilities in this advisory, including CVE-2026-42536.

CVE-2026-42536

7.5 (High)


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

Fixed: 5 products Known not affected: 70 products

https://access.redhat.com/errata/RHSA-2026:67152

Open the full advisory

rlsa-2026:34109

Vulnerability from osv_rocky

Published

2026-07-07 12:05

Modified

2026-07-21 12:07

Summary

Important: httpd security, bug fix, and enhancement update

Details

The httpd packages provide the Apache HTTP Server, a powerful, efficient, and extensible web server.

Security Fix(es):

httpd: incomplete fix for CVE-2023-38709 (CVE-2024-42516)
httpd: NULL pointer dereference via specially crafted request (CVE-2026-29169)
httpd: Apache HTTP Server: Heap-based Buffer Overflow via malicious backend servers (CVE-2026-34356)
httpd: Apache HTTP Server: Buffer Over-read via outbound OCSP requests to attacker-controlled server (CVE-2026-44185)
httpd: Apache HTTP Server: Denial of Service via crafted regular expressions (CVE-2026-44631)
httpd: Apache HTTP Server: Heap-based Buffer Overflow via untrusted content in mod_xml2enc (CVE-2026-42536)
httpd: Apache HTTP Server: Buffer overflow in mod_proxy_html allows security bypass (CVE-2026-34355)

Bug Fix(es) and Enhancement(s):

address Moderate severity issues from httpd 2.4.68 [rhel-10.2.z] (JIRA:Rocky Linux-184518)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

Severity

7.7 (High)


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

Credits

Rocky Enterprise Software Foundation

Red Hat

References

URL

Type

	https://errata.rockylinux.org/RLSA-2026:34109	ADVISORY
	https://bugzilla.redhat.com/show_bug.cgi?id=2486411	REPORT
	https://bugzilla.redhat.com/show_bug.cgi?id=2486397	REPORT
	https://bugzilla.redhat.com/show_bug.cgi?id=2374549	REPORT
	https://bugzilla.redhat.com/show_bug.cgi?id=2486399	REPORT
	https://bugzilla.redhat.com/show_bug.cgi?id=2486395	REPORT
	https://bugzilla.redhat.com/show_bug.cgi?id=2465296	REPORT
	https://bugzilla.redhat.com/show_bug.cgi?id=2486414	REPORT
	https://bugzilla.redhat.com/show_bug.cgi?id=2486415	REPORT
	https://bugzilla.redhat.com/show_bug.cgi?id=2465293	REPORT
	https://bugzilla.redhat.com/show_bug.cgi?id=2486416	REPORT
	https://bugzilla.redhat.com/show_bug.cgi?id=2486402	REPORT
	https://bugzilla.redhat.com/show_bug.cgi?id=2486406	REPORT
	https://bugzilla.redhat.com/show_bug.cgi?id=2464941	REPORT

JSON

To clipboard

{
  "affected": [
    {
      "package": {
        "ecosystem": "Rocky Linux:10",
        "name": "httpd",
        "purl": "pkg:rpm/rocky-linux/httpd?distro=rocky-linux-10\u0026epoch=0"
      },
      "ranges": [
        {
          "database_specific": {
            "yum_repository": "AppStream"
          },
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "0:2.4.63-13.el10_2.4"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "credits": [
    {
      "name": "Rocky Enterprise Software Foundation"
    },
    {
      "name": "Red Hat"
    }
  ],
  "details": "The httpd packages provide the Apache HTTP Server, a powerful, efficient, and extensible web server.\n\nSecurity Fix(es):\n\n* httpd: incomplete fix for CVE-2023-38709 (CVE-2024-42516)\n\n* httpd: NULL pointer dereference via specially crafted request (CVE-2026-29169)\n\n* httpd: Apache HTTP Server: Heap-based Buffer Overflow via malicious backend servers (CVE-2026-34356)\n\n* httpd: Apache HTTP Server: Buffer Over-read via outbound OCSP requests to attacker-controlled server (CVE-2026-44185)\n\n* httpd: Apache HTTP Server: Denial of Service via crafted regular expressions (CVE-2026-44631)\n\n* httpd: Apache HTTP Server: Heap-based Buffer Overflow via untrusted content in mod_xml2enc (CVE-2026-42536)\n\n* httpd: Apache HTTP Server: Buffer overflow in mod_proxy_html allows security bypass (CVE-2026-34355)\n\nBug Fix(es) and Enhancement(s):\n\n* address Moderate severity issues from httpd 2.4.68 [rhel-10.2.z] (JIRA:Rocky Linux-184518)\n\nFor more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.",
  "id": "RLSA-2026:34109",
  "modified": "2026-07-21T12:07:31.998925Z",
  "published": "2026-07-07T12:05:23.118123Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://errata.rockylinux.org/RLSA-2026:34109"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2486411"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2486397"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2374549"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2486399"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2486395"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2465296"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2486414"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2486415"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2465293"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2486416"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2486402"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2486406"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2464941"
    }
  ],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:H/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Important: httpd security, bug fix, and enhancement update",
  "upstream": [
    "CVE-2024-42516",
    "CVE-2026-24072",
    "CVE-2026-29169",
    "CVE-2026-33006",
    "CVE-2026-34355",
    "CVE-2026-34356",
    "CVE-2026-42535",
    "CVE-2026-42536",
    "CVE-2026-43951",
    "CVE-2026-44119",
    "CVE-2026-44185",
    "CVE-2026-44186",
    "CVE-2026-44631"
  ]
}

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.

Action not permitted

CVE-2026-42536 (GCVE-0-2026-42536)

Vulnerability from osv_rocky

Tags

Sightings

Nomenclature