What’s Vulnerable › Vulnerabilities

CVE-2026-48834: Apache Answer: Denial of service via crafted Accept-Language header parsing

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.8% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-08-05 · updated 2026-10-23
• Weakness: CWE-400

Description

Improper Handling of Length Parameter Inconsistency vulnerability in Apache Answer. This issue affects Apache Answer: through 2.0.1. Unauthenticated attackers can cause a denial of service via a specially crafted Accept-Language header that triggers excessive CPU consumption during parsing. Users are recommended to upgrade to version 2.0.2, which fixes the issue.

Affected products

• Apache Software Foundation Apache Answer: before 2.0.2 — fixed in 2.0.2

How to fix

Upgrade to a fixed version: Apache Software Foundation Apache Answer 2.0.2. Check the vendor advisory for mitigations.

References

• https://lists.apache.org/thread/0yg5smwnbrhqs55m5h61gn42mcs8s95p
• http://www.openwall.com/lists/oss-security/2026/08/05/9

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