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

What is CVE-2026-48834?

CVE-2026-48834 is a high-severity denial of service vulnerability in Apache Answer, published on 5 Aug 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official 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.

Weakness: CWE-400

Which versions are affected by CVE-2026-48834?

It affects 1 product.

Products include Apache Answer.

How do I fix CVE-2026-48834?

No fix has been published for CVE-2026-48834 yet. Limit exposure of the affected software until one is available.

Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.

Is CVE-2026-48834 being exploited?

There is no known exploitation of CVE-2026-48834 in the wild and no public exploit code.

Other vulnerabilities in Apache Answer

• CVE-2026-60053 Apache Answer: Residual Administrative API Key Access After Role or Account Revocation Critical 9.1
• CVE-2024-22393 Apache Answer: Pixel Flood Attack by uploading the large pixel file Critical 9.1
• CVE-2026-48911 Apache Answer: Unauthenticated OAuth Email-Binding Account Takeover via Existing User Confirmation Flow High 7.5
• CVE-2026-60023 Apache Answer: Unauthorized disclosure of deleted or pending answer content High 7.5
• CVE-2026-24735 Apache Answer: Revision API Improper Access Control leads to Information Disclosure High 7.5

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as GHSA-9mxc-x85j-v2wc.