CVE-2026-29167: Use After Free vulnerability in Apache HTTP Server with mod_ldap in per-directory configuration This issue af

This week

CRITICAL 9.8REMOTEWATCHLISTUPGRADE

CVE-2026-29167 is a critical-severity flaw (CVSS 9.8) affecting http server. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Use After Free vulnerability in Apache HTTP Server with mod_ldap in per-directory configuration 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.

Why this priority

Critical severity
CISA SSVC: automatable with total technical impact
Remotely exploitable, no login, no user action
On your watchlist

A fixed release or distro patch exists.

Risk facts

CVSS score	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.7% (top 47%)
CISA exploited list	No
Weakness	CWE-416
Published	2026-06-08
Last modified	2026-07-23

Publisher (CNA): Apache Software Foundation · Vendor: apache

Last updated 2026-07-23 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-06-08 16:16 UTCPublished CVE record published
2026-07-23 07:10 UTCUpdated Record last modified

apache http server UPGRADE

Affected: >= 2.4.0 and < 2.4.68

Fixed in: 2.4.68

Safe to downgrade to: a release before 2.4.0

1. Check installed version

apt-cache policy http-server || rpm -q http-server || http-server --version

2. UPGRADE to 2.4.68 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade http-server

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade http-server

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

3. If no update is available yet, DOWNGRADE to a release before 2.4.0 (Debian / Ubuntu)

apt-cache madison http-server sudo apt install http-server=<VERSION_BEFORE_2.4.0> sudo apt-mark hold http-server

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list http-server sudo dnf downgrade http-server-<VERSION_BEFORE_2.4.0> sudo dnf versionlock add http-server

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Exact fixes by distribution

Fedora 46 · arm-none-eabi-binutils-cs · FIXED · 2.47-1.fc46 · FEDORA-2026-7498616952 · source

sudo dnf upgrade --advisory=FEDORA-2026-7498616952

Debian 12 · apache2 · FIXED · 2.4.68-1~deb12u1

sudo apt update && sudo apt install --only-upgrade apache2 dpkg --compare-versions "$(dpkg-query -W -f='${Version}' apache2)" ge "2.4.68-1~deb12u1" && echo PATCHED || echo STILL-VULNERABLE

Debian 13 · apache2 · FIXED · 2.4.68-1~deb13u1

sudo apt update && sudo apt install --only-upgrade apache2 dpkg --compare-versions "$(dpkg-query -W -f='${Version}' apache2)" ge "2.4.68-1~deb13u1" && echo PATCHED || echo STILL-VULNERABLE

RHEL 10 · httpd · FIXED · httpd-2.4.63-13.el10_2.6

sudo dnf upgrade --advisory=RHSA-2026:60004 rpm -q httpd

RHEL 9 · httpd · FIXED · httpd-2.4.62-13.el9_8.6

sudo dnf upgrade --advisory=RHSA-2026:59347 rpm -q httpd

RHEL 9.2 Update Services for SAP Solutions · httpd · FIXED · httpd-2.4.53-11.el9_2.15

sudo dnf upgrade --advisory=RHSA-2026:67152 rpm -q httpd

RHEL 9.4 Update Services for SAP Solutions · httpd · FIXED · httpd-2.4.57-11.el9_4.5

sudo dnf upgrade --advisory=RHSA-2026:66323 rpm -q httpd

RHEL 9.6 Extended Update Support · httpd · FIXED · httpd-2.4.62-4.el9_6.6

sudo dnf upgrade --advisory=RHSA-2026:62165 rpm -q httpd

Amazon Linux 2023 · see advisory · FIXED · ALAS2023-2026-1880 · source

sudo dnf update --advisory=ALAS2023-2026-1880

Amazon Linux 2 · see advisory · FIXED · ALAS2-2026-3379 · source

sudo yum update --advisory=ALAS2-2026-3379

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-29167?

http server: upgrade to 2.4.68. Exact commands for each OS are on this page.

Is CVE-2026-29167 being exploited?

CVE-2026-29167 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-29167 affect?

CVE-2026-29167 affects http server. Severity is critical (CVSS 9.8). Use After Free vulnerability in Apache HTTP Server with mod_ldap in per-directory configuration 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.

How urgent is CVE-2026-29167?

Priority 60/100. Critical severity; CISA SSVC: automatable with total technical impact; Remotely exploitable, no login, no user action; On your watchlist

Software pages

Apache HTTP Server vulnerabilities

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References

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