CVE-2026-46729: NULL Pointer Dereference vulnerability in Apache HTTP Servers mod_heartmonitor over unicast listener. This

This month

HIGH 7.5REMOTEWATCHLISTUPGRADE

CVE-2026-46729 is a high-severity flaw (CVSS 7.5) affecting http server. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

NULL Pointer Dereference vulnerability in Apache HTTP Servers mod_heartmonitor over unicast listener. This issue affects Apache HTTP Server: from 2.4.0 through 2.4.68.

Why this priority

High severity
Remotely exploitable, no login, no user action
On your watchlist

A fixed release or distro patch exists.

Risk facts

CVSS score	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.5% (top 61%)
CISA exploited list	No
Weakness	CWE-476
Published	2026-10-01
Last modified	2026-10-08

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

Last updated 2026-10-08 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-10-01 16:17 UTCPublished CVE record published
2026-10-08 00:47 UTCUpdated Record last modified

apache http server UPGRADE

Affected: >= 2.4.0 and < 2.4.69

Fixed in: 2.4.69

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 2.4.69 (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.

Advisories and coverage

Official advisories

Amazon Linux 2023 ALAS: ALAS2023-2026-3202 (important): httpd 2026-10-12
Amazon Linux 2 ALAS: ALAS2-2026-3990 (important): httpd 2026-10-12

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-2026-46729?

http server: upgrade to 2.4.69. Exact commands for each OS are on this page.

Is CVE-2026-46729 being exploited?

CVE-2026-46729 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-2026-46729 affect?

CVE-2026-46729 affects http server. Severity is high (CVSS 7.5). NULL Pointer Dereference vulnerability in Apache HTTP Servers mod_heartmonitor over unicast listener. This issue affects Apache HTTP Server: from 2.4.0 through 2.4.68.

How urgent is CVE-2026-46729?

Priority 46/100. High severity; 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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