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Medium

NULL pointer dereference in Apache HTTP Server mod_authn_socache

IdentifiersCVE-2026-33007CWE-476· NULL Pointer Dereference

CVE-2026-33007 is a NULL pointer dereference vulnerability in the mod_authn_socache module of Apache HTTP Server affecting versions 2.4.0 through 2.4.66. In a caching forward proxy deployment, an unauthenticated remote attacker can send network requests that trigger the NULL dereference and crash an Apache child process. The issue is a memory-handling flaw in mod_authn_socache rather than a code execution bug, and Apache fixed it in 2.4.67.

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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 allows an unauthenticated remote attacker to cause a child process crash, resulting in reduced availability of the affected Apache HTTP Server instance. Based on the provided CVSS context, the impact is limited to availability (low) with no stated confidentiality or integrity impact. The described effect is service interruption or degraded performance rather than full system compromise.

Mitigation

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

If immediate upgrade is not possible, reduce exposure by avoiding or disabling the vulnerable caching forward proxy configuration in deployments using mod_authn_socache, and restrict untrusted network access to the proxy service. Limiting external reachability to trusted clients and disabling unnecessary proxy functionality can reduce exploitability until the fixed version is deployed. Specific mitigations beyond upgrade were not provided in the supplied content.

Remediation

Patch, then assume compromise.

Upgrade Apache HTTP Server to version 2.4.67 or later. Apache states that 2.4.67 fixes CVE-2026-33007. If version pinning or downstream packaging is in use, deploy the vendor backport containing the upstream fix for revision r1933358 or the equivalent packaged security update.
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

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

12 SOURCESView more in app
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

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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-2026-33007
NVD
nvd.nist.gov/vuln/detail/CVE-2026-33007
MITRE CWE · CWE-476
NULL Pointer Dereference
Vendor Advisory
httpd.apache.org/security/vulnerabilities_24.html
Third Party Advisory
openwall.com/lists/oss-security/2026/05/04/22