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CVE-2026-107281

AsyncHttpClient: Connection pool key omits the authenticated principal, so an NTLM or Negotiate connection is reused across identities

7.6 High

The AsyncHttpClient (AHC) library allows Java applications to easily execute HTTP requests and asynchronously process HTTP responses. Prior to 3.0.13 and 2.16.1, the HTTP/1.1 connection-pool key excludes the authenticated principal for connection-oriented NTLM and Negotiate authentication. A pooled socket authenticated for one request can be reused by a request carrying another principal, and the server executes that later request as the first identity. Basic and Digest are not affected because they authenticate each request. This issue is fixed in versions 3.0.13 and 2.16.1.

Attack profile

How easy it is to exploit

Attack vector
Network
Complexity
High
Privileges needed
Low
User interaction
None

What an attacker can affect

Confidentiality
High
Integrity
High
Availability
None

Exploit likelihood

0.17%Unchanged since Oct 8, 2026
90%50%10%1%

What each source reports

CVE List Score used 7.6

AsyncHttpClient: Connection pool key omits the authenticated principal, so an NTLM or Negotiate connection is reused across identities

The AsyncHttpClient (AHC) library allows Java applications to easily execute HTTP requests and asynchronously process HTTP responses. Prior to 3.0.13 and 2.16.1, the HTTP/1.1 connection-pool key excludes the authenticated principal for connection-oriented NTLM and Negotiate authentication. A pooled socket authenticated for one request can be reused by a request carrying another principal, and the server executes that later request as the first identity. Basic and Digest are not affected because they authenticate each request. This issue is fixed in versions 3.0.13 and 2.16.1.

Record
CVE-2026-107281
CVSS 4.0
7.6 HighCVSS:4.0/AV:N/AC:H/AT:P/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N
Weakness
CWE-346, CWE-863
Updated
2026-11-02
EUVDEUVD-2026-94640 7.6

The AsyncHttpClient (AHC) library allows Java applications to easily execute HTTP requests and asynchronously process HTTP responses. Prior to 3.0.13 and 2.16.1, the HTTP/1.1 connection-pool key excludes the authenticated principal for connection-oriented NTLM and Negotiate authentication. A pooled socket authenticated for one request can be reused by a request carrying another principal, and the server executes that later request as the first identity. Basic and Digest are not affected because they authenticate each request. This issue is fixed in versions 3.0.13 and 2.16.1.

Record
EUVD-2026-94640
CVSS 4.0
7.6 HighCVSS:4.0/AV:N/AC:H/AT:P/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N
Updated
2026-11-02
NVD 7.6

The AsyncHttpClient (AHC) library allows Java applications to easily execute HTTP requests and asynchronously process HTTP responses. Prior to 3.0.13 and 2.16.1, the HTTP/1.1 connection-pool key excludes the authenticated principal for connection-oriented NTLM and Negotiate authentication. A pooled socket authenticated for one request can be reused by a request carrying another principal, and the server executes that later request as the first identity. Basic and Digest are not affected because they authenticate each request. This issue is fixed in versions 3.0.13 and 2.16.1.

Record
CVE-2026-107281
CVSS 4.0
7.6 HighCVSS:4.0/AV:N/AC:H/AT:P/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Weakness
CWE-346, CWE-863
Updated
2026-11-02
OSV 7.6

AsyncHttpClient: Connection pool key omits the authenticated principal, so an NTLM or Negotiate connection is reused across identities

The AsyncHttpClient (AHC) library allows Java applications to easily execute HTTP requests and asynchronously process HTTP responses. Prior to 3.0.13 and 2.16.1, the HTTP/1.1 connection-pool key excludes the authenticated principal for connection-oriented NTLM and Negotiate authentication. A pooled socket authenticated for one request can be reused by a request carrying another principal, and the server executes that later request as the first identity. Basic and Digest are not affected because they authenticate each request. This issue is fixed in versions 3.0.13 and 2.16.1.

Record
CVE-2026-107281
CVSS 4.0
7.6 HighCVSS:4.0/AV:N/AC:H/AT:P/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N
Weakness
CWE-346, CWE-863
Updated
2026-11-02
OSVDEBIAN-CVE-2026-107281 7.6

The AsyncHttpClient (AHC) library allows Java applications to easily execute HTTP requests and asynchronously process HTTP responses. Prior to 3.0.13 and 2.16.1, the HTTP/1.1 connection-pool key excludes the authenticated principal for connection-oriented NTLM and Negotiate authentication. A pooled socket authenticated for one request can be reused by a request carrying another principal, and the server executes that later request as the first identity. Basic and Digest are not affected because they authenticate each request. This issue is fixed in versions 3.0.13 and 2.16.1.

Record
DEBIAN-CVE-2026-107281
CVSS 4.0
7.6 HighCVSS:4.0/AV:N/AC:H/AT:P/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Updated
2026-11-02
OSVUBUNTU-CVE-2026-107281 7.6

The AsyncHttpClient (AHC) library allows Java applications to easily execute HTTP requests and asynchronously process HTTP responses. Prior to 3.0.13 and 2.16.1, the HTTP/1.1 connection-pool key excludes the authenticated principal for connection-oriented NTLM and Negotiate authentication. A pooled socket authenticated for one request can be reused by a request carrying another principal, and the server executes that later request as the first identity. Basic and Digest are not affected because they authenticate each request. This issue is fixed in versions 3.0.13 and 2.16.1.

Record
UBUNTU-CVE-2026-107281
CVSS 4.0
7.6 HighCVSS:4.0/AV:N/AC:H/AT:P/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
async-http-client
Debian:12
All versions, plus listed versions
2.12.3-12.12.3-1+deb12u1
None known
async-http-client
Ubuntu:Pro:14.04:LTS
All versions, plus listed versions
1.6.5-11.6.5-21.6.5-2ubuntu0.1~esm1
None known
async-http-client
Ubuntu:16.04:LTS
All versions, plus listed versions
1.6.5-4
None known
async-http-client
Ubuntu:18.04:LTS
All versions, plus listed versions
1.6.5-41.6.5-5
None known
async-http-client
Ubuntu:Pro:20.04:LTS
All versions, plus listed versions
2.6.0-12.6.0-1ubuntu0.1~esm1
None known
async-http-client
Ubuntu:22.04:LTS
All versions, plus listed versions
2.12.2-12.12.3-12.12.3-1ubuntu0.22.04.1
None known
async-http-client
Ubuntu:24.04:LTS
All versions, plus listed versions
2.12.3-12.12.3-1ubuntu0.24.04.1
None known
async-http-client
Ubuntu:26.10
All versions, plus listed versions
2.12.3-1ubuntu1
None known
async-http-client
Ubuntu:26.04:LTS
All versions, plus listed versions
2.12.3-12.12.3-1ubuntu12.12.3-1ubuntu1.1
None known

History

History
RecordedChangedSources
first indexedCVE List, EUVD, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2026-107281 is a high vulnerability (CVSS 7.6) in Asynchttpclient Async-http-client, published October 7, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.17%, the 6th percentile. No source names a fixed version.

References

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