CVE-2026-85721 AsyncHttpClient - Denial of Service

AsyncHttpClient 2.0.0 to 2.16.1 and 3.0.8 to 3.0.12 contains a denial of service caused by unbounded HTTP response decompression in Http1ContentDecompressor and HTTP/2 decompressor, letting attackers exhaust client heap memory, exploit requires attacker to send crafted compressed responses.

CVSS base score 7.5 /10
High
CISA KEV
Not listed
Public exploit
Proof of concept available
Authentication
Not required
EPSS
0.63% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Denial of Service
Impact
Denial Of Service
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Published
17 September 2026
Updated
15 October 2026
Weakness
CWE-400

Vendor fix

Update to versions 2.16.1 or 3.0.12 or later.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

← All CVEs