CVE-2026-42536
📛 CVE Title
Apache HTTP Server: mod_xml2enc heap overflow
Description
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.
Description (MITRE) cveawg.mitre.org
Pulled from cveawg.mitre.org/api/cve/CVE-2026-42536 on 2026-07-28. Shown when MITRE's text differs from the cvelistV5 mirror.
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.
Overview
- State
- —
- Assigner (CNA)
- —
- CVSS severity
- high
- CVSS score
- 7.5 / 10
- CVSS vector
AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H- Effective score
- 7.5 / 10 HIGH source: CNA overview
- MSRC score
- 7.5 / 10 HIGH MS rating: Important
- CWE(s)
-
CWE-122 - Reserved
- —
- Published
- 2026-06-09 07:00 UTC
- Last updated
- 2026-06-20 01:43 UTC
- Source
- https://www.tenable.com/cve/CVE-2026-42536
- Linked Threat
- CVE-2026-42536 — CVE-2026-42536
NVD triage scoring NVD CVE 2.0
Layer NVD adds on top of the CNA's CVE record — published / last-modified timestamps, exploitability / impact subscores, and the FIRST.org EPSS probability that this CVE will be exploited in the wild in the next 30 days.
- NVD published
- 2026-06-08 16:16:39 UTC
- NVD last modified
- 2026-07-23 07:10:00 UTC
- NVD CVSS v3.1
- 7.5 / 10 HIGH source: 134c704f-9b21-4f2e-91b3-4a467353bcc0
- NVD CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H- Exploitability subscore
- 3.9 / 10
- Impact subscore
- 3.6 / 10
- EPSS score
- 0.0096 (probability of exploitation in next 30 days)
- EPSS percentile
- 57.87% vs all CVEs — higher = more likely to be exploited, as of 2026-07-27
NVD-assigned CWE(s):
CWE-122,
CWE-120
(differs from the CNA list above)
NVD / KEV / EPSS data refreshed 2026-07-28 12:48 UTC. Re-run the 🛰 Backfill from NVD button above to refresh.
European Union Vulnerability Database ENISA EUVD
ENISA's official EU repository for curated vulnerability intelligence. Carries a separate identifier (EUVD-YYYY-NNNN) and frequently exposes an earlier-published description + CVSS than NVD does.
- EUVD ID
-
EUVD-2026-35100 - Assigner
- apache
- Published
- Jun 8, 2026, 3:23:46 PM
- Updated
- Jul 28, 2026, 12:04:43 PM
- EUVD base score (CVSS 3.1)
-
7.5 / 10
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H - EUVD-reported EPSS
- 0.9900
- Vendors
- Apache Software Foundation
- Products
-
Apache HTTP Server (2.4.0 ≤2.4.67)
- Aliases
-
GHSA-2p7m-6jhq-26cm
ENISA description: 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.
EUVD references (1)
Microsoft Security Response Center MSRC
Microsoft's vendor-authoritative record from the Security Update Guide — its own CVSS score, impact, severity rating, exploit assessment, and KB-article fixes. Refreshed 2026-11-03 04:06 UTC (source: CVRF).
- MS severity
- Important
- MS CVSS base score
- 7.5 / 10 (temporal 7.5)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H - Release
- 2026-Jun
Affected products — CPE 2.3 (1) NVD
NVD's normalized CPE 2.3 matchers, used by vendor tools (vulnerability scanners, asset managers) for automated detection. Compare with the CNA's free-text "Affected products" section above.
cpe:2.3:a:apache:http_server:*:*:*:*:*:*:*:*
Vendor references (0)
References embedded in the original CVE record by the assigning CNA.
None in the CVE record.
Web references (5)
DuckDuckGo results ranked by threat-intel / vendor advisory domains. Generated by the 🔎 Find references (web) button above — same flow as the Remediations search.
- MSRC update guide: CVE-2026-42536 msrc
- http://www.openwall.com/lists/oss-security/2026/06/08/9 tenable:www.openwall.com
- https://httpd.apache.org/security/vulnerabilities_24.html tenable:httpd.apache.org
- https://nvd.nist.gov/vuln/detail/CVE-2026-42536 tenable:nvd.nist.gov
- https://www.cve.org/CVERecord?id=CVE-2026-42536 tenable:www.cve.org
NVD-tagged references (9)
Reference list NVD curates from the CNA record, vendor advisories, and third-party reports. The tag chips below are NVD's analyst-assigned categories.
- http://www.openwall.com/lists/oss-security/2026/06/08/9 af854a3a-2127-422b-91ae-364da2661108 Mailing ListThird Party Advisory
- https://httpd.apache.org/security/vulnerabilities_24.html security@apache.org Vendor Advisory
- https://access.redhat.com/errata/RHSA-2026:25042 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
- https://access.redhat.com/errata/RHSA-2026:34109 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
- https://access.redhat.com/errata/RHSA-2026:41906 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
- https://access.redhat.com/errata/RHSA-2026:42828 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
- https://access.redhat.com/security/cve/CVE-2026-42536 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
- https://bugzilla.redhat.com/show_bug.cgi?id=2486411 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-42536.json 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
Remediations (10)
Remediations are stored against the linked Threat row; the list below is deduplicated across both pages.
-
web:access.redhat.com
Learn about our open source products, services, and company. You are here
2026-06-19 02:37 UTC -
web:app.opencve.io
Remediation No vendor fix or workaround currently provided. OpenCVE Recommended Actions Apply the vendor patch by upgrading Apache HTTP Server to version 2.4.68 or later If upgrading immediately is not possible, configure the server to drop or reject XML requests sent to mod_xml2enc to limit exposure
2026-06-19 02:37 UTC -
web:github.com
GitHub is where people build software. More than 150 million people use GitHub to discover, fork, and contribute to over 420 million projects.
2026-06-19 02:37 UTC -
web:portal.msrc.microsoft.com
The Security Update Guide provides information on the latest Microsoft security updates, helping users understand and address potential vulnerabilities effectively.
2026-06-19 02:37 UTC -
web:security-tracker.debian.org
Vulnerable and fixed packages The table below lists information on source packages.
2026-06-19 02:37 UTC -
web:vulert.com
Learn about CVE-2026-42536 , a heap overflow vulnerability in Apache HTTP Server's mod_xml2enc module, and how to fix it.
2026-06-19 02:37 UTC -
web:vulners.com
Summary ( CVE-2026-42536 ) : A heap-based buffer overflow in Apache HTTP Server affects 2.4.0-2.4.67 through the mod_xml2enc component (and related parsing of untrusted content via xml2StartParse).
2026-06-19 02:37 UTC -
web:www.crowdstrike.com
Microsoft has released security updates for 130 vulnerabilities, including 30 critical, in its May 2026 Patch Tuesday rollout.
2026-06-19 02:37 UTC -
web:www.tenable.com
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.
2026-06-19 02:37 UTC -
web:zecurit.com
Get the complete breakdown of Microsoft's June 2026 Patch Tuesday. We analyze the latest security updates and all critical CVEs .
2026-06-19 02:37 UTC
AI Forensic Analysis
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