CVE-2026-85721

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Source
https://cve.org/CVERecord?id=CVE-2026-85721
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-85721.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-85721
Aliases
Downstream
Published
2026-09-17T15:55:32Z
Modified
2026-09-18T08:05:16Z
Severity
  • 7.5 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H CVSS Calculator
Summary
AsyncHttpClient: Unbounded HTTP/1.1 response decompression enables a decompression-bomb denial of service
Details

The AsyncHttpClient (AHC) library allows Java applications to easily execute HTTP requests and asynchronously process HTTP responses. From 2.0.0 until 2.16.1 and 3.0.12, automatic response decompression on the HTTP/1.1 path uses ChannelManager.newHttpContentDecompressor() to install Http1ContentDecompressor without a cumulative output-size limit. A hostile or compromised server, or an attacker who can alter a response in transit, can send a small gzip, deflate, or snappy response that expands across chunks until the client exhausts its heap and raises OutOfMemoryError; brotli and zstd are also affected when their optional codecs are present. In versions 3.0.8 through 3.0.10, the HTTP/2 decompressor is also unbounded, so switching protocols does not mitigate the issue on those releases. A limit applied to each decode call is insufficient because the response can be delivered as many small chunks, so the fixed implementation tracks total decompressed bytes for the whole response. This issue is fixed in versions 2.16.1 and 3.0.12.

Database specific 
{
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
        "CWE-400",
        "CWE-409"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/85xxx/CVE-2026-85721.json"
}
References

Affected packages

Git / github.com/asynchttpclient/async-http-client

Affected ranges

Type
GIT
Repo
https://github.com/asynchttpclient/async-http-client
Events
Introduced
b60e5a0d7d989e4a24c13e03ba786c375b727448
Fixed
d1f0ccec417092098d40242fee7dfac84bb3c21f
Introduced
9a771c7b40e716ca77a3cad691545b29ff64bfd3
Fixed
c07038b44e5206375662b46859672e8f1df9f05a
Database specific
Show details 
{
    "extracted_events": [
        {
            "introduced": "2.0.0"
        },
        {
            "fixed": "2.16.1"
        },
        {
            "introduced": "3.0.0"
        },
        {
            "fixed": "3.0.12"
        }
    ],
    "source": "AFFECTED_FIELD"
}

Affected versions

async-http-client-project-2.*
async-http-client-project-2.0.0
async-http-client-project-2.0.1
async-http-client-project-2.0.10
async-http-client-project-2.0.11
async-http-client-project-2.0.12
async-http-client-project-2.0.13
async-http-client-project-2.0.14
async-http-client-project-2.0.15
async-http-client-project-2.0.16
async-http-client-project-2.0.17
async-http-client-project-2.0.18
async-http-client-project-2.0.19
async-http-client-project-2.0.2
async-http-client-project-2.0.20
async-http-client-project-2.0.21
async-http-client-project-2.0.22
async-http-client-project-2.0.23
async-http-client-project-2.0.24
async-http-client-project-2.0.3
async-http-client-project-2.0.4
async-http-client-project-2.0.5
async-http-client-project-2.0.6
async-http-client-project-2.0.7
async-http-client-project-2.0.8
async-http-client-project-2.0.9
async-http-client-project-2.1.0
async-http-client-project-2.1.0-RC1
async-http-client-project-2.1.0-RC2
async-http-client-project-2.1.0-RC3
async-http-client-project-2.1.0-RC4
async-http-client-project-2.1.0-alpha10
async-http-client-project-2.1.0-alpha11
async-http-client-project-2.1.0-alpha12
async-http-client-project-2.1.0-alpha13
async-http-client-project-2.1.0-alpha14
async-http-client-project-2.1.0-alpha15
async-http-client-project-2.1.0-alpha16
async-http-client-project-2.1.0-alpha17
async-http-client-project-2.1.0-alpha18
async-http-client-project-2.1.0-alpha19
async-http-client-project-2.1.0-alpha2
async-http-client-project-2.1.0-alpha20
async-http-client-project-2.1.0-alpha21
async-http-client-project-2.1.0-alpha22
async-http-client-project-2.1.0-alpha23
async-http-client-project-2.1.0-alpha24
async-http-client-project-2.1.0-alpha25
async-http-client-project-2.1.0-alpha26
async-http-client-project-2.1.0-alpha3
async-http-client-project-2.1.0-alpha4
async-http-client-project-2.1.0-alpha5
async-http-client-project-2.1.0-alpha6
async-http-client-project-2.1.0-alpha7
async-http-client-project-2.1.0-alpha8
async-http-client-project-2.1.0-alpha9
async-http-client-project-2.1.1
async-http-client-project-2.1.2
async-http-client-project-2.10.0
async-http-client-project-2.10.1
async-http-client-project-2.10.2
async-http-client-project-2.10.3
async-http-client-project-2.10.4
async-http-client-project-2.10.5
async-http-client-project-2.11.0
async-http-client-project-2.12.0
async-http-client-project-2.12.1
async-http-client-project-2.12.2
async-http-client-project-2.12.3
async-http-client-project-2.12.4
async-http-client-project-2.14.5
async-http-client-project-2.15.0
async-http-client-project-2.16.0
async-http-client-project-2.2.0
async-http-client-project-2.2.1
async-http-client-project-2.3.0
async-http-client-project-2.4.0
async-http-client-project-2.4.1
async-http-client-project-2.4.2
async-http-client-project-2.4.3
async-http-client-project-2.4.4
async-http-client-project-2.4.5
async-http-client-project-2.4.6
async-http-client-project-2.4.7
async-http-client-project-2.4.8
async-http-client-project-2.4.9
async-http-client-project-2.5.0
async-http-client-project-2.5.1
async-http-client-project-2.5.2
async-http-client-project-2.5.3
async-http-client-project-2.5.4
async-http-client-project-2.6.0
async-http-client-project-2.7.0
async-http-client-project-2.8.0
async-http-client-project-2.8.1
async-http-client-project-2.9.0
async-http-client-project-3.*
async-http-client-project-3.0.0
async-http-client-project-3.0.1
async-http-client-project-3.0.10
async-http-client-project-3.0.11
async-http-client-project-3.0.2
async-http-client-project-3.0.3
async-http-client-project-3.0.4
async-http-client-project-3.0.5
async-http-client-project-3.0.6
async-http-client-project-3.0.7
async-http-client-project-3.0.8
async-http-client-project-3.0.9

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-85721.json"
vanir_signatures 
[
    {
        "deprecated": false,
        "digest": {
            "line_hashes": [
                "219246596221720898981563676126452787927",
                "112413554918931264338179563940130289539",
                "262908889413526511266896616639455764237"
            ],
            "threshold": 0.9
        },
        "id": "CVE-2026-85721-26220b3f",
        "signature_type": "Line",
        "signature_version": "v1",
        "source": "https://github.com/asynchttpclient/async-http-client/commit/d1f0ccec417092098d40242fee7dfac84bb3c21f",
        "target": {
            "file": "client/src/main/java/org/asynchttpclient/cookie/ThreadSafeCookieStore.java"
        }
    },
    {
        "deprecated": false,
        "digest": {
            "function_hash": "319981061666573934872902157208912328509",
            "length": 685
        },
        "id": "CVE-2026-85721-c7b286ac",
        "signature_type": "Function",
        "signature_version": "v1",
        "source": "https://github.com/asynchttpclient/async-http-client/commit/d1f0ccec417092098d40242fee7dfac84bb3c21f",
        "target": {
            "file": "client/src/main/java/org/asynchttpclient/cookie/ThreadSafeCookieStore.java",
            "function": "add"
        }
    }
]
vanir_signatures_modified 
"2026-09-18T08:05:16Z"