CVE-2026-54399

Description

Uncontrolled Resource Consumption vulnerability in the HTTP/1.1 message parser in Apache HttpComponents Core (5.4.2 and earlier, 5.5-beta1 and earlier) allows an remote attacker to cause a denial of service through memory exhaustion by sending messages with excessive number of headers / excessive header length

CVSS v3.1 Score

7.5

HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS — Exploit Prediction

0.0041

Probability of exploitation

0.33%

Percentile rank

EPSS estimates the probability that this vulnerability will be exploited in the wild within the next 30 days. A higher score means more likely to be exploited.

Weakness Type (CWE)

CWE-400 Uncontrolled Resource Consumption

Affected Products

Vendor	Product	Versions
apache	httpcomponents_core	< 5.4.2
apache	httpcomponents_core	All
apache	httpcomponents_core	All

References

Advisories & Patches

https://lists.apache.org/thread/zmxh1pl2zohov5ntdh4lt85gfrlchgpy

Other References

http://www.openwall.com/lists/oss-security/2026/07/01/4

Frequently Asked Questions

What is CVE-2026-54399? +

Uncontrolled Resource Consumption vulnerability in the HTTP/1.1 message parser in Apache HttpComponents Core (5.4.2 and earlier, 5.5-beta1 and earlier) allows an remote attacker to cause a denial of service through memory exhaustion by sending messages with excessive number of headers / excessive header length It has a CVSS v3.1 base score of 7.5 (HIGH).

How severe is CVE-2026-54399? +

CVE-2026-54399 has a CVSS v3.1 score of 7.5 out of 10, rated HIGH. This is a high-severity vulnerability that should be prioritized for patching. The EPSS score is 0.0041, placing it in the 0th percentile for exploitation probability.

What products are affected by CVE-2026-54399? +

CVE-2026-54399 affects products from apache, specifically: httpcomponents_core. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2026-54399? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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