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CVE-2026-28780

Apache HTTP Server buffer overflow

9.8 CRITICALEPSS 1.63%
  1. Published5 May 2026

Description

Heap-based Buffer Overflow vulnerability in mod_proxy_ajp of Apache HTTP Server. If mod_proxy_ajp connects to a malicious AJP server this AJP server can send a malicious AJP message back to mod_proxy_ajp and cause it to write 4 attacker controlled bytes after the end of a heap based buffer. This issue affects Apache HTTP Server: through 2.4.66. Users are recommended to upgrade to version 2.4.67, which fixes the issue.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionNone
ScopeUnchanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

Apache HTTP Server< 2.4.67

Remediation

Fixed in
Apache HTTP Server≥ 2.4.67

References

and 7 more references

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Frequently asked

Is CVE-2026-28780 being actively exploited?

CVE-2026-28780 is not in the CISA KEV catalog. Its EPSS exploit probability is 1.63%.

How severe is CVE-2026-28780?

CVE-2026-28780 has a CVSS 3.1 base score of 9.8, rated critical. EPSS estimates a 1.63% probability of exploitation.

Which products are affected by CVE-2026-28780?

Affected products include Apache HTTP Server.

How do I fix CVE-2026-28780?

Upgrade affected software to a fixed version, for example Apache HTTP Server 2.4.67 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-28780 against the real software inventory on every managed device, as each hourly inventory arrives. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.