Apache HttpComponents Core up to 5.4.2/5.5-beta1 Header Length resource consumption

Summaryinfo

A vulnerability, which was classified as problematic, has been found in Apache HttpComponents Core up to 5.4.2/5.5-beta1. This issue affects some unknown processing of the component Header Length Handler. Performing a manipulation results in resource consumption. This vulnerability is identified as CVE-2026-54399. The attack can be initiated remotely. There is not any exploit available.

Detailsinfo

A vulnerability was found in Apache HttpComponents Core up to 5.4.2/5.5-beta1. It has been classified as problematic. This affects an unknown functionality of the component Header Length Handler. The manipulation with an unknown input leads to a resource consumption vulnerability. CWE is classifying the issue as CWE-400. The product does not properly control the allocation and maintenance of a limited resource, thereby enabling an actor to influence the amount of resources consumed, eventually leading to the exhaustion of available resources. This is going to have an impact on availability. The summary by CVE is:

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

The advisory is shared at lists.apache.org. This vulnerability is uniquely identified as CVE-2026-54399 since 06/13/2026. The exploitability is told to be easy. It is possible to initiate the attack remotely. Neither technical details nor an exploit are publicly available. The price for an exploit might be around USD $0-$5k at the moment (estimation calculated on 07/01/2026). MITRE ATT&CK project uses the attack technique T1499 for this issue.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Productinfo

Vendor

• Apache

Name

• HttpComponents Core

Version

• 5.4.0
• 5.4.1
• 5.4.2
• 5.5-beta1

License

• open-source

Website

• Vendor: https://www.apache.org/

CPE 2.3info

• 🔒
• 🔒
• 🔒

CPE 2.2info

• 🔒
• 🔒
• 🔒

CVSSv4info

CVSSv3info

CVSSv2info

Exploitinginfo

Threat Intelligenceinfo

Countermeasuresinfo

Timelineinfo

Sourcesinfo

Entryinfo

If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Discussion