Apache HTTP Server up to 2.4.66 buffer over-read

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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7.0$5k-$25k0.00

Summaryinfo

A vulnerability was found in Apache HTTP Server up to 2.4.66. It has been rated as critical. Affected by this issue is some unknown functionality. This manipulation causes buffer over-read. This vulnerability is registered as CVE-2026-34059. Remote exploitation of the attack is possible. No exploit is available. Upgrading the affected component is advised.

Detailsinfo

A vulnerability classified as critical was found in Apache HTTP Server up to 2.4.66. Affected by this vulnerability is an unknown function. The manipulation with an unknown input leads to a buffer over-read vulnerability. The CWE definition for the vulnerability is CWE-126. The product reads from a buffer using buffer access mechanisms such as indexes or pointers that reference memory locations after the targeted buffer. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

Buffer Over-read vulnerability in Apache HTTP Server. This issue affects Apache HTTP Server: through 2.4.66. Users are recommended to upgrade to version 2.4.67, which fixes the issue.

The weakness was published by Elhanan Haenel. It is possible to read the advisory at httpd.apache.org. This vulnerability is known as CVE-2026-34059 since 03/25/2026. The exploitation appears to be easy. The attack can be launched remotely. The exploitation doesn't need any form of authentication. The technical details are unknown and an exploit is not publicly available. The pricing for an exploit might be around USD $5k-$25k at the moment (estimation calculated on 05/06/2026).

The vulnerability scanner Nessus provides a plugin with the ID 312249 (FreeBSD : www/apache24 -- Multiple vulnerabilities (1ccc383b-486a-11f1-8b62-8447094a420f)), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 2.4.67 eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at Tenable (312249). Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Productinfo

Type

Vendor

Name

Version

License

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 7.3
VulDB Meta Temp Score: 7.0

VulDB Base Score: 7.3
VulDB Temp Score: 7.0
VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Buffer over-read
CWE: CWE-126 / CWE-119
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Nessus ID: 312249
Nessus Name: FreeBSD : www/apache24 -- Multiple vulnerabilities (1ccc383b-486a-11f1-8b62-8447094a420f)

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: HTTP Server 2.4.67

Timelineinfo

03/25/2026 CVE reserved
05/04/2026 +39 days Advisory disclosed
05/04/2026 +0 days VulDB entry created
05/06/2026 +2 days VulDB entry last update

Sourcesinfo

Vendor: apache.org

Advisory: httpd.apache.org
Researcher: Elhanan Haenel
Status: Confirmed

CVE: CVE-2026-34059 (🔒)
GCVE (CVE): GCVE-0-2026-34059
GCVE (VulDB): GCVE-100-360955

Entryinfo

Created: 05/04/2026 15:39
Updated: 05/06/2026 03:49
Changes: 05/04/2026 15:39 (55), 05/06/2026 03:49 (2)
Complete: 🔍
Cache ID: 216::103

Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

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