No exploitation reportedFix available

CVE-2026-29168

Q: Is CVE-2026-29168 actively exploited?

Active exploitation of CVE-2026-29168 has not been confirmed. Its EPSS score was 1.1% on 2026-10-22, the estimated probability of exploitation in the next 30 days.

Q: What is the CVSS score for CVE-2026-29168?

CVE-2026-29168 has a CVSS v3 base score of 7.3 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L.

Apache HTTP Server: mod_md unrestricted OCSP response

No exploitation reported by the sources we read.

Published2026-05-05
Fixed in2.4.67
WeaknessCWE-770

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

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.

Timeline

dates in UTC

2026-05-0514:16CVE publishedNVD

Observed activity

isMalicious corpus · updated 2026-10-23 18:48 UTC

Indicators tagged with this CVE, per day0 indicators over 7 days

Block these indicators

Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2026-29168?format=txt
CSV export: https://api.ismalicious.com/edl/cve/CVE-2026-29168?format=csv
TAXII collection of exploited CVEs
The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD · OSV

Apache HTTP Server

Branch	Affected	Fixed in	Source
2.4	≥ 2.4.30, < 2.4.67	2.4.67	NVD · OSV

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

mod_mdAlmaLinux:10all versions · fixed in 1:2.4.26-5.el10_2.1
mod_mdAlmaLinux:9all versions · fixed in 1:2.4.26-2.el9_8.1

Vendor advisories

CVE-2026-29168 Red Hat Product Security103 products fixed
httpd: mod_md: unrestricted OCSP response leads to resource exhaustion
RHSA-2026:57844 Red Hat Product Security5 products fixed
Red Hat Security Advisory: mod_md security update
RHSA-2026:57641 Red Hat Product Security5 products fixed
Red Hat Security Advisory: mod_md security update
RHSA-2026:57642 Red Hat Product Security5 products fixed
Red Hat Security Advisory: mod_md security update
RHSA-2026:53537 Red Hat Product Security23 products fixed
Red Hat Security Advisory: Red Hat Hardened Images RPMs bug fix and enhancement update
RHSA-2026:52393 Red Hat Product Security5 products fixed
Red Hat Security Advisory: mod_md security update

4 more advisories

Full record on NVD

Fix

Update Apache HTTP Server to 2.4.67
Vendor fix Red Hat Product Security RHSA-2026:57844 · 5 productsFor details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258
Vendor fix Red Hat Product Security RHSA-2026:53537 · 23 productsFor details on how to apply this update, which includes the changes described in this advisory, refer to: https://images.redhat.com/
Vendor fix Red Hat Product Security RHSA-2026:27200 · 33 productsBefore applying this update, make sure all previously released errata relevant to your system have been applied. For details on how to apply this update, refer to: https://access.redhat.com/articles/11258
Workaround from the vendor Red Hat Product Security RHSA-2026:57844 · 13 productsDisabling mod_md and restarting httpd will mitigate this flaw.

Advisories and patches

httpd.apache.orgRelease Notes · Vendor Advisory

Detection

Nuclei template: none so far
Exploit-DB: no entry
Proof-of-concept repositories: none listed

Sources

NVDCVE recordread 2026-10-23
CISA-ADPSSVC decisionnone2026-05-05
OpenCVESSVC decisionnone—
CISA-ADPCVSS 3.17.32026-05-05
CNAweakness (CWE)CWE-770read 2026-10-23
FIRST EPSSEPSS score1.1 %2026-10-22
OSVaffected packages—
Microsoft MSRCadvisory—

Technical details

CVSS v3 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
Published: 2026-05-05
Last Modified: 2026-06-17
NVD status: Analyzed
MSRC Title: Apache HTTP Server: mod_md unrestricted OCSP response

Frequently asked questions

What is CVE-2026-29168?

Is CVE-2026-29168 actively exploited?

Active exploitation of CVE-2026-29168 has not been confirmed. Its EPSS score was 1.1% on 2026-10-22, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2026-29168?

CVE-2026-29168 has a CVSS v3 base score of 7.3 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L.

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