CVE-2026-102740
AsyncHttpClient: Resumable download index store is created world-readable and follows a planted symlink
- Published
- Updated
- Reserved
- Assigned by
- GitHub_M
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.
Timeline
ID reserved
By GitHub_M
- 16 days later
· 16 days later
Published
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| GitHub_MCNA (assigner) | 3.1 | Medium5.8 | CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:H/A:L |
| NVDNVD · Awaiting Analysis | 3.1 | Medium5.8 | CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:H/A:L |
- EPSS (exploitation in 30 days)
- 0.10% · top 99% of all CVEs (7 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: no · Technical impact: partial
The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 5.8.
Weakness
- CWE-61: UNIX Symbolic Link (Symlink) Following (opens in a new tab)All about CWE-61 and its CVEs
- CWE-379: Creation of Temporary File in Directory with Insecure Permissions (opens in a new tab)All about CWE-379 and its CVEs
- CWE-732: Incorrect Permission Assignment for Critical Resource (opens in a new tab)All about CWE-732 and its CVEs
Affected products
AsyncHttpClient · async-http-client
- affected >= 2.0.0, < 2.16.1
- affected >= 3.0.0, < 3.0.12
References (6)
- https://github.com/AsyncHttpClient/async-http-client/security/advisories/GHSA-cf59-3jcr-vfhw (opens in a new tab)x_refsource_CONFIRM
- https://github.com/AsyncHttpClient/async-http-client/pull/2281 (opens in a new tab)x_refsource_MISC
- https://github.com/AsyncHttpClient/async-http-client/commit/0422e11c954c4b026e986d1458f7a7a2eab7e591 (opens in a new tab)x_refsource_MISC
- https://github.com/AsyncHttpClient/async-http-client/commit/d945ce3357b093e74526871cd309832a717ecfda (opens in a new tab)x_refsource_MISC
- https://github.com/AsyncHttpClient/async-http-client/releases/tag/async-http-client-project-2.16.1 (opens in a new tab)x_refsource_MISC
- https://github.com/AsyncHttpClient/async-http-client/releases/tag/async-http-client-project-3.0.12 (opens in a new tab)x_refsource_MISC
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://trackcve.app/cve/CVE-2026-102740)Record last updated .