Unrated

Use-after-free in Apache HTTP Server mod_ldap per-directory configuration

IdentifiersCVE-2026-29167CWE-416· Use After Free

CVE-2026-29167 is a low-severity use-after-free vulnerability in Apache HTTP Server affecting the mod_ldap module when used in per-directory configuration. The issue affects Apache HTTP Server versions 2.4.0 through 2.4.67. Available reporting indicates the flaw involves a dangling pointer/use-after-free condition in mod_ldap under per-directory configuration handling. The issue was reported on 2026-03-02, fixed in the 2.4.x branch on 2026-06-03 in revision r1934935, and released in Apache HTTP Server 2.4.68 on 2026-06-08.

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ANALYST BRIEF

Impact, mitigation & remediation

What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.

Impact

What an attacker gets, and what they’ve been doing with it.

Successful exploitation can trigger memory corruption and undefined behavior in the Apache HTTP Server process. Based on the available advisory text, the most substantiated impact is process instability or a crash/denial of service. Because this is a use-after-free condition, more severe consequences may be theoretically possible depending on runtime conditions, but the provided source material only supports low severity and does not document confirmed code execution.

Mitigation

If you can’t patch tonight, do this now.

No specific workaround is provided in the available Apache advisory material. Where immediate upgrade is not possible, reduce exposure by avoiding or minimizing use of mod_ldap in per-directory configuration until the server can be updated. Primary mitigation is patching to 2.4.68 or later.

Remediation

Patch, then assume compromise.

Upgrade Apache HTTP Server to version 2.4.68 or later. Apache states that version 2.4.68 fixes this issue. The fix was committed to the 2.4.x branch as revision r1934935.

PUBLIC EXPLOITS

Exploits

No public exploits tracked yet. Mallory keeps watching.

VALID 0 / 0 TOTALView more in app

No public exploit code observed for this vulnerability.

EXPOSURE SURFACE

Affected products & vendors

Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.

VendorProductType

Apache Software FoundationHttp Serverapplication

Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.

ACTIVITY FEED

Recent activity

9 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.

9 SOURCESView more in app

cyber security newsNews

Jun 9, 2026

Apache HTTP Server 2.4.68 Released With Fix For Use-After-Free, DoS, XSS, and Buffer Overflow Flaws

A use-after-free vulnerability in Apache HTTP Server mod_ldap per-directory configurations affecting versions 2.4.0 through 2.4.67.

opennet ruNews

Jun 5, 2026

�� http-�� Apache 2.4.68 � �� 13 ��

Apache HTTP Server vulnerability affecting mod_ldap, fixed in version 2.4.68.

opennetNews

Jun 5, 2026

�� http-�� Apache 2.4.68 � �� 13 ��

Apache HTTP Server vulnerability in mod_ldap.

downloads apacheNews

Jan 1, 2026

[no-title]

A use-after-free vulnerability in Apache HTTP Server mod_ldap affecting per-directory configuration handling.

What this page doesn’t show

The version that knows your environment.

This page is what’s public. Mallory adds the parts that aren’t: which of your assets are affected, which adversaries are exploiting it right now, which detections to deploy, and what to do tonight.

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Exposure mapping

Query your assets running an affected version, and investigate the blast radius.

Threat actor evidence

Every observed campaign linking this CVE to a named adversary.

Associated malware

Malware families riding this exploit, with evidence and IOCs.

Detection signatures

YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.

Vendor-by-vendor mapping

Cross-references every affected SKU, including bundled OEM variants.

Social activity5

Community discussion across Reddit, Mastodon, and other social sources.

EXTERNAL REFERENCES

MITRE CVE

cve.org · CVE-2026-29167

NVD

nvd.nist.gov/vuln/detail/CVE-2026-29167

MITRE CWE · CWE-416

Use After Free

openwall.com

openwall.com/lists/oss-security/2026/06/08/4

openwall.com

openwall.com/lists/oss-security/2026/06/09/1

httpd.apache.org

httpd.apache.org/security/vulnerabilities_24.html