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CVE.org (no NVD analysis yet)· CNA GitHub_M

CVE-2026-107285: AsyncHttpClient: WebSocket proxy credentials sent to the origin server over a CONNECT tunnel

MediumCVSS 5.9 · v3.1—No exploit Fix available

Noroxi assessment

Priority: Monitor (action score 23/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.20% (FIRST EPSS).
  • Anyone who can reach it over the internet can trigger it. No account or password is required. No user action is required. Special conditions such as timing or configuration are required.
  • Fixed version: org.asynchttpclient:async-http-client (Maven) 2.16.1, 3.0.12.

Low priority for now. Upgrade to org.asynchttpclient:async-http-client (Maven) 2.16.1, 3.0.12 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

The AsyncHttpClient (AHC) library allows Java applications to easily execute HTTP requests and asynchronously process HTTP responses. Prior to 3.0.12 and 2.16.1, a proxied ws request is carried through CONNECT, but NettyRequestFactory.newNettyRequest and requestUri decide whether to attach proxy authentication and an absolute-form target only from whether the URI is secure. Because ws is not marked secure, the tunneled WebSocket upgrade sent to the origin includes the proxy's Proxy-Authorization value. Basic credentials are directly recoverable and Digest responses can be replayed or cracked offline. This issue is fixed in versions 3.0.12 and 2.16.1.

Published
Oct 7, 2026
Updated
Oct 8, 2026
EPSS
0.2% · 10th percentile

Report tools

JSON

Action score

23

Monitor

Low priority for now.

CVSS
23 / 40 · 5.9 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.2%

CISA SSVC decision

Exploitation
none
Automatable
no
Technical impact
partial

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
—
CNA · GitHub_M
5.9
NVD has not scored this yet; the score shown is the CNA’s.

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

If any of these changes, we'll tell you in the daily email digest.

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When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

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Versions reported by the vendor

Affected version ranges reported by the assigning authority (GitHub_M). Independent of NVD's CPE analysis and usually ahead of it.

  • AsyncHttpClient async-http-client

    • >= 3.0.0, <3.0.12, >= 2.0.0, < 2.16.1affected

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Debian:12async-http-clientfrom 0—
Mavenorg.asynchttpclient:async-http-clientfrom 2.0.0 · before 2.16.12.16.1
Mavenorg.asynchttpclient:async-http-clientfrom 3.0.0 · before 3.0.123.0.12

Same product

asynchttpclient: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-107282AsyncHttpClient: Replay to a different host sends the original host request and credentials to the new host
    37Monitor
  • CVE-2024-53990AsyncHttpClient (AHC) library's `CookieStore` replaces explicitly defined `Cookie`s
    36Monitor
  • CVE-2026-107279AsyncHttpClient: Digest mutual authentication is switched off by a peer offering qop=auth-int
    35Monitor

Published before and after this one in the same product

  • ← EarlierCVE-2026-107283Oct 7, 2026 · AsyncHttpClient: Digest authentication cnonce generated with a non-cryptographic random source
    14Monitor
  • ← EarlierCVE-2026-107284Oct 7, 2026 · AsyncHttpClient: WebSocket handshake continues after a failed Sec-WebSocket-Accept check
    14Monitor
  • Later →CVE-2026-107226Oct 12, 2026 · AsyncHttpClient: Cookies received over plaintext HTTP can plant, overwrite or delete Secure cookies set over HTTPS
    27Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
Maven:org.asynchttpclient:async-http-client2.16.1Package registry (OSV)
Maven:org.asynchttpclient:async-http-client3.0.12Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

  1. Published
  2. Fix recorded+1 d
  3. TodayNov 12, 2026+36 d
EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

  • CVE-2026-1072820 days apartAsyncHttpClient: Replay to a different host sends the original host request and credentials to the new host
    37Monitor
  • CVE-2026-1072310 days apartAsyncHttpClient: Digest challenge without a usable nonce downgrades to Basic and sends the password in cleartext
    34Monitor
  • CVE-2026-1072320 days apartAsyncHttpClient: Origin credentials sent in cleartext to a proxy that rejects the CONNECT
    30Monitor
  • CVE-2026-8571920 days apartAsyncHttpClient: SOCKS proxy credentials sent to the origin server over plaintext HTTP
    30Monitor
  • CVE-2026-8572020 days apartAsyncHttpClient: Origin credentials sent to the proxy on the plaintext CONNECT request
    23Monitor

Not on record for this CVE: researcher credit · public bounty program.

Technical details

Attack conditions

  • Anyone who can reach it over the internet can trigger it.
  • No account or password is required.
  • No user action is required.
  • Special conditions such as timing or configuration are required.

If successful

Confidentiality
high · data can be read
Integrity
none
Availability
none
Attack vector
Network
Attack complexity
High
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality impact
High
Integrity impact
None
Availability impact
None

Weakness class (CWE)

CWE-319 · Cleartext Transmission of Sensitive Information

CVSS vector

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N

nvd-secondary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

Change log

  1. Fix✗ → ✓
  2. SSVC exploitation— → none
  3. Exploit maturity— → none

For records you follow, these changes also arrive as notifications. →

References

Show all references (4 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records