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TI-2026-23286 Aliases CVE-2026-29168GHSA-h688-wmf2-q99q

Apache HTTP Server: mod_md unrestricted OCSP response

Priority LOW 39CWE-770Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
Denial of service
Confidentiality · integrity · availability
Low · Low · Low
Fix status
Fixed

Attack profile from CVSS 3.1 · CISA ADP. Fix status from CNA and Red Hat. Impact type from CWE-770.

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00628 50th percentileScored 2026-11-07
Fix Fixed Red Hat: 9 advisories

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
Yes
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
ApacheApache HTTP Server2.4.30 – 2.4.66—No fix listedCNA
  • Apache HTTP Server VendorApache Affected 2.4.30 – 2.4.66 Fixed in — No fix listed CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:apache:http_server:*:*:*:*:*:*:*:*2.4.30 to before 2.4.67VulnerableApache
  • cpe:2.3:a:apache:http_server:*:*:*:*:*:*:*:* Versions 2.4.30 to before 2.4.67 Vulnerable ·Apache

Remediation

Red Hat 9 advisories

  • RHSA-2026:57844 Released 2026-08-21 · Red Hat rating Moderate
    mod_md security update
    • Red Hat Enterprise Linux AppStream E4S (v.9.4) mod_md-1:2.4.19-1.el9_4.2
  • RHSA-2026:57641 Released 2026-08-20 · Red Hat rating Moderate
    mod_md security update
    • Red Hat Enterprise Linux AppStream EUS (v.9.6) mod_md-1:2.4.26-1.el9_6.2
  • RHSA-2026:57642 Released 2026-08-20 · Red Hat rating Moderate
    mod_md security update
    • Red Hat Enterprise Linux AppStream E4S (v.9.2) mod_md-1:2.4.19-1.el9_2.2
Show 6 more Red Hat advisories
  • RHSA-2026:53537 Released 2026-08-11 · Red Hat rating Moderate
    Red Hat Hardened Images RPMs bug fix and enhancement update
    • Red Hat Hardened Images httpd-2.4.68-6.hum1@aarch64, httpd-2.4.68-6.hum1@src, httpd-2.4.68-6.hum1@x86_64 +20
  • RHSA-2026:52393 Released 2026-08-10 · Red Hat rating Moderate
    mod_md security update
    • Red Hat Enterprise Linux AppStream EUS (v. 10.0) mod_md-1:2.4.26-3.el10_0.2
  • RHSA-2026:30845 Released 2026-06-29 · Red Hat rating Moderate
    mod_md security update
    • Red Hat Enterprise Linux AppStream (v. 10) mod_md-1:2.4.26-5.el10_2.1
  • RHSA-2026:30844 Released 2026-06-29 · Red Hat rating Moderate
    mod_md security update
    • Red Hat Enterprise Linux AppStream (v. 9) mod_md-1:2.4.26-2.el9_8.1
  • RHSA-2026:27200 Released 2026-06-22 · Red Hat rating Important
    Red Hat JBoss Core Services Apache HTTP Server 2.4.62 SP4 security update
    • Red Hat JBoss Core Services on RHEL 7 Server jbcs-httpd24-httpd-2.4.62-13.el7jbcs, jbcs-httpd24-httpd-devel-2.4.62-13.el7jbcs, jbcs-httpd24-httpd-manual-2.4.62-13.el7jbcs +10
    • Red Hat JBoss Core Services on RHEL 8 jbcs-httpd24-httpd-2.4.62-13.el8jbcs, jbcs-httpd24-httpd-devel-2.4.62-13.el8jbcs, jbcs-httpd24-httpd-manual-2.4.62-13.el8jbcs +10
  • RHSA-2026:27201 Released 2026-06-22 · Red Hat rating Important
    Red Hat JBoss Core Services Apache HTTP Server 2.4.62 SP4 security update
    • Red Hat JBoss Core Services 2.4.62.SP4

Vendor assessments

Red Hat

Red Hat rating: Moderate. Red Hat's page for this CVE →

ProductStatusPlan or fix
Red Hat Enterprise Linux AppStream (v. 10)Fixed RHSA-2026:30845
Red Hat Enterprise Linux AppStream (v. 9)Fixed RHSA-2026:30844
Red Hat Enterprise Linux AppStream E4S (v.9.2)Fixed RHSA-2026:57642
Red Hat Enterprise Linux AppStream E4S (v.9.4)Fixed RHSA-2026:57844
Red Hat Enterprise Linux AppStream EUS (v. 10.0)Fixed RHSA-2026:52393
Red Hat Enterprise Linux AppStream EUS (v.9.6)Fixed RHSA-2026:57641
Red Hat Hardened ImagesFixed RHSA-2026:53537
Red Hat JBoss Core Services 2.4.62.SP4Fixed RHSA-2026:27201
Red Hat JBoss Core Services on RHEL 7 ServerFixed RHSA-2026:27200
Red Hat JBoss Core Services on RHEL 8Fixed RHSA-2026:27200
Not affected: 7 products
  • Red Hat Enterprise Linux 8
  • Red Hat Enterprise Linux AppStream E4S (v.9.2)
  • Red Hat Enterprise Linux AppStream E4S (v.9.4)
  • Red Hat Enterprise Linux AppStream EUS (v. 10.0)
  • Red Hat Enterprise Linux AppStream EUS (v.9.6)
  • Red Hat JBoss Core Services on RHEL 7 Server
  • Red Hat JBoss Core Services on RHEL 8

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-29168
  2. 2026-10-03 Alias added: GHSA-h688-wmf2-q99q
  3. 2026-10-09 Fix available: RHSA-2026:27201 · Red Hat
  4. 2026-10-16 Fix available: Red Hat JBoss Core Services 2.4.62.SP4 · Red Hat
  5. 2026-10-25 EPSS moved to the below the 50th percentile
  6. 2026-10-25 Priority changed: MEDIUM → LOW
  7. 2026-10-29 EPSS moved to the 50th–90th percentile

References

Advisory 2

  • TI-2021-18535 Path Traversal and Remote Code Execution in Apache HTTP Server 2.4.49 and 2.4.50 (incomplete fix of CVE-2021-41773) KEVCVSS 3.1CRITICAL 9.8
  • TI-2021-18417 Path traversal and file disclosure vulnerability in Apache HTTP Server 2.4.49 KEVCVSS 3.1CRITICAL 9.8
  • TI-2024-25716 Apache HTTP Server weakness in mod_rewrite when first segment of substitution matches filesystem path. KEVCVSS 3.1CRITICAL 9.1
  • TI-2021-17490 mod_proxy SSRF KEVCVSS 3.1CRITICAL 9.0
  • TI-2019-00184 Use after free in Apache HTTP Server KEVCVSS 3.1HIGH 7.8
  • TI-2009-03392 The TLS protocol, and the SSL protocol 3.0 and possibly earlier, as used in Microsoft… CVSS 3.1CRITICAL 9.8
See all 349 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences