High

Use-after-free in Apache HTTP Server mod_http2 under file handle exhaustion

IdentifiersCVE-2026-48913CWE-416· Use After Free

CVE-2026-48913 is a use-after-free vulnerability in the Apache HTTP Server mod_http2 module. The flaw is triggered when mod_http2 operates while file handles are already exhausted, leading to a memory corruption condition. Apache states that affected versions are Apache HTTP Server 2.4.55 through 2.4.67. The issue was fixed in the 2.4.x branch by revision r1934882 and is addressed in Apache HTTP Server 2.4.68.

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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 cause memory corruption in the httpd process handling HTTP/2 traffic. Based on the available information, the most clearly supported impact is process instability or denial of service, such as crashes or other undefined behavior in Apache HTTP Server. The provided content does not establish reliable evidence of attacker-controlled code execution.

Mitigation

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

No specific workaround is provided in the supplied content, and Apache indicated that most vulnerabilities fixed in 2.4.68 do not have workarounds. Where immediate upgrade is not possible, reducing exposure by disabling mod_http2 or HTTP/2 service would likely reduce attack surface, but this mitigation is not explicitly stated in the provided material.

Remediation

Patch, then assume compromise.

Upgrade Apache HTTP Server to version 2.4.68 or later. Apache identifies the fix in the 2.4.x branch as revision r1934882. Affected deployments are versions 2.4.55 through 2.4.67 with mod_http2 present.

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

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

8 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_http2 affecting versions 2.4.55 through 2.4.67 when file handles are exhausted.

opennet ruNews

Jun 5, 2026

�� http-�� Apache 2.4.68 � �� 13 ��

Apache HTTP Server vulnerability affecting mod_http2, fixed in version 2.4.68.

opennetNews

Jun 5, 2026

�� http-�� Apache 2.4.68 � �� 13 ��

Apache HTTP Server mod_http2 vulnerability causing improper stream handling and potential service disruption.

downloads apacheNews

Jan 1, 2026

[no-title]

A use-after-free memory corruption vulnerability in Apache HTTP Server mod_http2 that can occur when file handles are exhausted.

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 activity4

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

EXTERNAL REFERENCES

MITRE CVE

cve.org · CVE-2026-48913

NVD

nvd.nist.gov/vuln/detail/CVE-2026-48913

MITRE CWE · CWE-416

Use After Free

openwall.com

openwall.com/lists/oss-security/2026/06/08/15

httpd.apache.org

httpd.apache.org/security/vulnerabilities_24.html