CVE-2026-102740: Async http client · The AsyncHttpClient library allows Java applications to execute HTTP requests and
Affects async-http-clientSource GCVE Database
Not known to be exploited · CVSS 5.8 Medium · fixed in 2.16.1 : update async-http-client when convenient.
Data as of 28 Oct 2026, 22:31 UTC
- Patch
- Available – fixed in 2.16.1
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:H/A:LExploitation evidence
Disclosed: evidence found.
CVE published 15 Oct 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponised: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors
A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 26 Oct 2026.
What to do
Affected software
| Product | Affected | Fixed in |
|---|---|---|
Ubuntu 26.10async-http-clientpkg:deb/ubuntu/async-http-client?arch=source&distro=stonkingOther threats | Affected
| Fixed in– |
Ubuntu 26.04 LTSasync-http-clientpkg:deb/ubuntu/async-http-client?arch=source&distro=resoluteOther threats | Affected
| Fixed in– |
Ubuntu 24.04 LTSasync-http-clientpkg:deb/ubuntu/async-http-client?arch=source&distro=nobleOther threats | Affected
| Fixed in– |
Ubuntu 22.04 LTSasync-http-clientpkg:deb/ubuntu/async-http-client?arch=source&distro=jammyOther threats | Affected
| Fixed in– |
Ubuntu Pro 20.04 LTSasync-http-clientpkg:deb/ubuntu/async-http-client?arch=source&distro=esm-apps/focalOther threats | Affected
| Fixed in– |
Ubuntu 18.04 LTSasync-http-clientpkg:deb/ubuntu/async-http-client?arch=source&distro=bionicOther threats | Affected
| Fixed in– |
Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.
Description
The AsyncHttpClient library allows Java applications to execute HTTP requests and asynchronously process HTTP responses. From 2.0.0 until 2.16.1 and 3.0.12, PropertiesBasedResumableProcessor stores resumable download state at the predictable shared path $java.io.tmpdir/ahc/ResumableAsyncHandler.properties with default permissions and link-following file operations. A local user who can read the shared store can see download URLs, including embedded user information or query tokens. A local user who can write within or pre-create the affected shared store directory can plant a symbolic link that the client follows when saving state, truncating and overwriting a target file writable by the client process. The filesystem path is used when ResumableAsyncHandler decorates another AsyncHandler, while the no-argument constructors use a no-op processor and are unaffected. This issue is fixed in versions 2.16.1 and 3.0.12.
References
- ubuntu.com/security/CVE-2026-102740 (opens in a new tab)
- cve.org/CVERecord?id=CVE-2026-102740 (opens in a new tab)
- github.com/AsyncHttpClient/async-http-client/commit/0422e11c954c4b026e986d1458f7a7a2eab7e591 (opens in a new tab)
- github.com/AsyncHttpClient/async-http-client/commit/d945ce3357b093e74526871cd309832a717ecfda (opens in a new tab)
- github.com/AsyncHttpClient/async-http-client/pull/2281 (opens in a new tab)
- github.com/AsyncHttpClient/async-http-client/releases/tag/async-http-client-project-2.16.1 (opens in a new tab)
- github.com/AsyncHttpClient/async-http-client/releases/tag/async-http-client-project-3.0.12 (opens in a new tab)
- github.com/AsyncHttpClient/async-http-client/security/advisories/GHSA-cf59-3jcr-vfhw (opens in a new tab)