CVE-2026-85719Network attack vector

Proxy credential disclosure via unchecked proxy type

Published Sep 17, 2026 · Updated Sep 18, 2026

Credential exposure in Async Http Client 2.1.0 through 2.16.0 and 3.0.0 through 3.0.11 allows remote attackers to obtain SOCKS proxy credentials. NettyRequestFactory and NettyRequestSender add Proxy-Authorization without confirming an HTTP proxy, while ProxyUnauthorized407Interceptor answers a hostile origin's 407 challenge through the SOCKS tunnel. Exploitation requires an authenticated SOCKS proxy and either preemptive authentication over plaintext HTTP or an origin that returns 407; exposed material includes reversible Basic credentials and NTLM, Kerberos, or SPNEGO credentials.

CVSS severity7.5
High
EPSS probability0.36%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Credential exposure in Async Http Client 2.1.0 through 2.16.0 and 3.0.0 through 3.0.11 allows remote attackers to obtain SOCKS proxy credentials. NettyRequestFactory and NettyRequestSender add Proxy-Authorization without confirming an HTTP proxy, while ProxyUnauthorized407Interceptor answers a hostile origin's 407 challenge through the SOCKS tunnel. Exploitation requires an authenticated SOCKS proxy and either preemptive authentication over plaintext HTTP or an origin that returns 407; exposed material includes reversible Basic credentials and NTLM, Kerberos, or SPNEGO credentials.

The record

CVE
CVE-2026-85719
Published
Sep 17, 2026
Updated
Sep 18, 2026
Vendor
AsyncHttpClient
Product
Async Http Client
Classifications
CWE-319, CWE-441, CWE-522, T1187
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 17, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 18, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=>= 2.1.0, < 2.16.1
  2. Affected versionversion=>= 3.0.0, < 3.0.12

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

AsyncHttpClient · Async Http Clientversion=>= 2.1.0, < 2.16.1; version=>= 3.0.0, < 3.0.12

Published CVSS scores

7.5AsyncHttpClientCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Activity data is delayed. The latest report is Sep 28, 2026.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 22, 2026Sep 28, 2026
Latest reporting daySep 28, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-319Cleartext Transmission of Sensitive Information
CWE-441Unintended Proxy or Intermediary ('Confused Deputy')
CWE-522Insufficiently Protected Credentials
T1187Forced Authentication

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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