Vulnerability-Lookup

RHSA-2026:30845

Vulnerability from csaf_redhat - Published: 2026-06-29 18:28 - Updated: 2026-11-05 16:50

Summary

Red Hat Security Advisory: mod_md security update

Severity

Moderate

Notes

Topic: An update for mod_md is now available for Red Hat Enterprise Linux 10. Red Hat Product Security has rated this update as having a security impact of Moderate. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.

Details: This module manages common properties of domains for one or more virtual hosts. Specifically it can use the ACME protocol to automate certificate provisioning. Certificates will be configured for managed domains and their virtual hosts automatically, including at renewal. Security Fix(es): * httpd: mod_md: unrestricted OCSP response leads to resource exhaustion (CVE-2026-29168) 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.

Terms of Use: This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Red Hat Inc. and provide a link to the original.

CVE-2026-29168

A flaw was found in the mod_md module of httpd. When processing OCSP (Online Certificate Status Protocol) responses from a malicious or compromised OCSP responder, the module fails to enforce proper size limits on the incoming data. This issue leads to memory exhaustion and a denial of service.

7.5 (High)


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

CWE-770 - Allocation of Resources Without Limits or Throttling

Affected products

Fixed 13 products

Product	Version	Remediation
Unresolved product id: AppStream-10.2.Z:mod_md-1:2.4.26-5.el10_2.1.aarch64	—	Vendor Fix fix Workaround
Unresolved product id: AppStream-10.2.Z:mod_md-1:2.4.26-5.el10_2.1.ppc64le	—	Vendor Fix fix Workaround
Unresolved product id: AppStream-10.2.Z:mod_md-1:2.4.26-5.el10_2.1.s390x	—	Vendor Fix fix Workaround
Unresolved product id: AppStream-10.2.Z:mod_md-1:2.4.26-5.el10_2.1.src	—	Vendor Fix fix Workaround
Unresolved product id: AppStream-10.2.Z:mod_md-1:2.4.26-5.el10_2.1.x86_64	—	Vendor Fix fix Workaround
Unresolved product id: AppStream-10.2.Z:mod_md-debuginfo-1:2.4.26-5.el10_2.1.aarch64	—	Vendor Fix fix Workaround
Unresolved product id: AppStream-10.2.Z:mod_md-debuginfo-1:2.4.26-5.el10_2.1.ppc64le	—	Vendor Fix fix Workaround
Unresolved product id: AppStream-10.2.Z:mod_md-debuginfo-1:2.4.26-5.el10_2.1.s390x	—	Vendor Fix fix Workaround
Unresolved product id: AppStream-10.2.Z:mod_md-debuginfo-1:2.4.26-5.el10_2.1.x86_64	—	Vendor Fix fix Workaround
Unresolved product id: AppStream-10.2.Z:mod_md-debugsource-1:2.4.26-5.el10_2.1.aarch64	—	Vendor Fix fix Workaround
Unresolved product id: AppStream-10.2.Z:mod_md-debugsource-1:2.4.26-5.el10_2.1.ppc64le	—	Vendor Fix fix Workaround
Unresolved product id: AppStream-10.2.Z:mod_md-debugsource-1:2.4.26-5.el10_2.1.s390x	—	Vendor Fix fix Workaround
Unresolved product id: AppStream-10.2.Z:mod_md-debugsource-1:2.4.26-5.el10_2.1.x86_64	—	Vendor Fix fix Workaround

Threats

Impact Moderate

References

9 references

URL	Category
https://access.redhat.com/errata/RHSA-2026:30845	self
https://access.redhat.com/security/updates/classi…	external
https://bugzilla.redhat.com/show_bug.cgi?id=2466753	external
https://security.access.redhat.com/data/csaf/v2/a…	self
https://access.redhat.com/security/cve/CVE-2026-29168	self
https://bugzilla.redhat.com/show_bug.cgi?id=2466753	external
https://www.cve.org/CVERecord?id=CVE-2026-29168	external
https://nvd.nist.gov/vuln/detail/CVE-2026-29168	external
https://httpd.apache.org/security/vulnerabilities…	external

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        "product_reference": "mod_md-debugsource-1:2.4.26-5.el10_2.1.x86_64",
        "relates_to_product_reference": "AppStream-10.2.Z"
      }
    ]
  },
  "vulnerabilities": [
    {
      "cve": "CVE-2026-29168",
      "cwe": {
        "id": "CWE-770",
        "name": "Allocation of Resources Without Limits or Throttling"
      },
      "discovery_date": "2026-05-05T14:01:25.519480+00:00",
      "ids": [
        {
          "system_name": "Red Hat Bugzilla ID",
          "text": "2466753"
        }
      ],
      "notes": [
        {
          "category": "description",
          "text": "A flaw was found in the mod_md module of httpd. When processing OCSP (Online Certificate Status Protocol) responses from a malicious or compromised OCSP responder, the module fails to enforce proper size limits on the incoming data. This issue leads to memory exhaustion and a denial of service.",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "httpd: mod_md: unrestricted OCSP response leads to resource exhaustion",
          "title": "Vulnerability summary"
        },
        {
          "category": "other",
          "text": "To exploit this flaw, the Apache HTTP Server must query an untrusted or compromised OCSP responder, limiting its exposure. Due to this reason, this vulnerability has been rated with a moderate severity.\n\nThis flaw only affects configurations with mod_md loaded and being used. This module can be disabled via the configuration file if its functionality is not being used.",
          "title": "Statement"
        },
        {
          "category": "general",
          "text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
          "title": "CVSS score applicability"
        }
      ],
      "product_status": {
        "fixed": [
          "AppStream-10.2.Z:mod_md-1:2.4.26-5.el10_2.1.aarch64",
          "AppStream-10.2.Z:mod_md-1:2.4.26-5.el10_2.1.ppc64le",
          "AppStream-10.2.Z:mod_md-1:2.4.26-5.el10_2.1.s390x",
          "AppStream-10.2.Z:mod_md-1:2.4.26-5.el10_2.1.src",
          "AppStream-10.2.Z:mod_md-1:2.4.26-5.el10_2.1.x86_64",
          "AppStream-10.2.Z:mod_md-debuginfo-1:2.4.26-5.el10_2.1.aarch64",
          "AppStream-10.2.Z:mod_md-debuginfo-1:2.4.26-5.el10_2.1.ppc64le",
          "AppStream-10.2.Z:mod_md-debuginfo-1:2.4.26-5.el10_2.1.s390x",
          "AppStream-10.2.Z:mod_md-debuginfo-1:2.4.26-5.el10_2.1.x86_64",
          "AppStream-10.2.Z:mod_md-debugsource-1:2.4.26-5.el10_2.1.aarch64",
          "AppStream-10.2.Z:mod_md-debugsource-1:2.4.26-5.el10_2.1.ppc64le",
          "AppStream-10.2.Z:mod_md-debugsource-1:2.4.26-5.el10_2.1.s390x",
          "AppStream-10.2.Z:mod_md-debugsource-1:2.4.26-5.el10_2.1.x86_64"
        ]
      },
      "references": [
        {
          "category": "self",
          "summary": "Canonical URL",
          "url": "https://access.redhat.com/security/cve/CVE-2026-29168"
        },
        {
          "category": "external",
          "summary": "RHBZ#2466753",
          "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2466753"
        },
        {
          "category": "external",
          "summary": "https://www.cve.org/CVERecord?id=CVE-2026-29168",
          "url": "https://www.cve.org/CVERecord?id=CVE-2026-29168"
        },
        {
          "category": "external",
          "summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-29168",
          "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-29168"
        },
        {
          "category": "external",
          "summary": "https://httpd.apache.org/security/vulnerabilities_24.html",
          "url": "https://httpd.apache.org/security/vulnerabilities_24.html"
        }
      ],
      "release_date": "2026-05-05T13:10:05.656000+00:00",
      "remediations": [
        {
          "category": "vendor_fix",
          "date": "2026-06-29T18:28:04+00:00",
          "details": "For details on how to apply this update, which includes the changes described in this advisory, refer to:\n\nhttps://access.redhat.com/articles/11258",
          "product_ids": [
            "AppStream-10.2.Z:mod_md-1:2.4.26-5.el10_2.1.aarch64",
            "AppStream-10.2.Z:mod_md-1:2.4.26-5.el10_2.1.ppc64le",
            "AppStream-10.2.Z:mod_md-1:2.4.26-5.el10_2.1.s390x",
            "AppStream-10.2.Z:mod_md-1:2.4.26-5.el10_2.1.src",
            "AppStream-10.2.Z:mod_md-1:2.4.26-5.el10_2.1.x86_64",
            "AppStream-10.2.Z:mod_md-debuginfo-1:2.4.26-5.el10_2.1.aarch64",
            "AppStream-10.2.Z:mod_md-debuginfo-1:2.4.26-5.el10_2.1.ppc64le",
            "AppStream-10.2.Z:mod_md-debuginfo-1:2.4.26-5.el10_2.1.s390x",
            "AppStream-10.2.Z:mod_md-debuginfo-1:2.4.26-5.el10_2.1.x86_64",
            "AppStream-10.2.Z:mod_md-debugsource-1:2.4.26-5.el10_2.1.aarch64",
            "AppStream-10.2.Z:mod_md-debugsource-1:2.4.26-5.el10_2.1.ppc64le",
            "AppStream-10.2.Z:mod_md-debugsource-1:2.4.26-5.el10_2.1.s390x",
            "AppStream-10.2.Z:mod_md-debugsource-1:2.4.26-5.el10_2.1.x86_64"
          ],
          "restart_required": {
            "category": "none"
          },
          "url": "https://access.redhat.com/errata/RHSA-2026:30845"
        },
        {
          "category": "workaround",
          "details": "Disabling mod_md and restarting httpd will mitigate this flaw.",
          "product_ids": [
            "AppStream-10.2.Z:mod_md-1:2.4.26-5.el10_2.1.aarch64",
            "AppStream-10.2.Z:mod_md-1:2.4.26-5.el10_2.1.ppc64le",
            "AppStream-10.2.Z:mod_md-1:2.4.26-5.el10_2.1.s390x",
            "AppStream-10.2.Z:mod_md-1:2.4.26-5.el10_2.1.src",
            "AppStream-10.2.Z:mod_md-1:2.4.26-5.el10_2.1.x86_64",
            "AppStream-10.2.Z:mod_md-debuginfo-1:2.4.26-5.el10_2.1.aarch64",
            "AppStream-10.2.Z:mod_md-debuginfo-1:2.4.26-5.el10_2.1.ppc64le",
            "AppStream-10.2.Z:mod_md-debuginfo-1:2.4.26-5.el10_2.1.s390x",
            "AppStream-10.2.Z:mod_md-debuginfo-1:2.4.26-5.el10_2.1.x86_64",
            "AppStream-10.2.Z:mod_md-debugsource-1:2.4.26-5.el10_2.1.aarch64",
            "AppStream-10.2.Z:mod_md-debugsource-1:2.4.26-5.el10_2.1.ppc64le",
            "AppStream-10.2.Z:mod_md-debugsource-1:2.4.26-5.el10_2.1.s390x",
            "AppStream-10.2.Z:mod_md-debugsource-1:2.4.26-5.el10_2.1.x86_64"
          ]
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 7.5,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "NONE",
            "integrityImpact": "NONE",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
            "version": "3.1"
          },
          "products": [
            "AppStream-10.2.Z:mod_md-1:2.4.26-5.el10_2.1.aarch64",
            "AppStream-10.2.Z:mod_md-1:2.4.26-5.el10_2.1.ppc64le",
            "AppStream-10.2.Z:mod_md-1:2.4.26-5.el10_2.1.s390x",
            "AppStream-10.2.Z:mod_md-1:2.4.26-5.el10_2.1.src",
            "AppStream-10.2.Z:mod_md-1:2.4.26-5.el10_2.1.x86_64",
            "AppStream-10.2.Z:mod_md-debuginfo-1:2.4.26-5.el10_2.1.aarch64",
            "AppStream-10.2.Z:mod_md-debuginfo-1:2.4.26-5.el10_2.1.ppc64le",
            "AppStream-10.2.Z:mod_md-debuginfo-1:2.4.26-5.el10_2.1.s390x",
            "AppStream-10.2.Z:mod_md-debuginfo-1:2.4.26-5.el10_2.1.x86_64",
            "AppStream-10.2.Z:mod_md-debugsource-1:2.4.26-5.el10_2.1.aarch64",
            "AppStream-10.2.Z:mod_md-debugsource-1:2.4.26-5.el10_2.1.ppc64le",
            "AppStream-10.2.Z:mod_md-debugsource-1:2.4.26-5.el10_2.1.s390x",
            "AppStream-10.2.Z:mod_md-debugsource-1:2.4.26-5.el10_2.1.x86_64"
          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Moderate"
        }
      ],
      "title": "httpd: mod_md: unrestricted OCSP response leads to resource exhaustion"
    }
  ]
}

CVE-2026-29168 (GCVE-0-2026-29168)

Vulnerability from cvelistv5 – Published: 2026-05-05 13:10 – Updated: 2026-05-05 16:31

Title

Apache HTTP Server: mod_md unrestricted OCSP response

Summary

Allocation of Resources Without Limits or Throttling vulnerability in Apache HTTP Server's mod_md via OCSP response data. This issue affects Apache HTTP Server: from 2.4.30 through 2.4.66. Users are recommended to upgrade to version 2.4.67, which fixes the issue.

Severity

7.3 (High)


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

SSVC

Exploitation: none Automatable: yes Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-05-05 15:34 UTC

CWE

CWE-770 - Allocation of Resources Without Limits or Throttling

Assigner

apache CNA under the mitre root

CNA scorecard B 76/100 over 1265 records in the last 180 days details

References

2 references

URL	Tags
https://httpd.apache.org/security/vulnerabilities…	vendor-advisory
http://www.openwall.com/lists/oss-security/2026/05/05/6

Impacted products

1 product

Vendor	Product	Version
Apache Software Foundation	Apache HTTP Server	Affected: 2.4.30 , ≤ 2.4.66 (semver) cpe:2.3:a:apache:http_server::::::::

Credits

Pavel Kohout, Aisle Research, Aisle.com

Show details on NVD website

JSON

To clipboard

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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.

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.

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