AsyncHttpClient: Resumable download index store is created world-readable and follows a planted symlink

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-102740
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-10-15 18:17:21 UTC
Updated2026-10-16 20:02:37 UTC
DescriptionThe 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.

Risk And Classification

Primary CVSS: v3.1 5.8 MEDIUM from [email protected]

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

EPSS: 0.001000000 probability, percentile 0.007930000 (date 2026-10-16)

Problem Types: CWE-61 | CWE-379 | CWE-732 | CWE-61 CWE-61: UNIX Symbolic Link (Symlink) Following | CWE-379 CWE-379: Creation of Temporary File in Directory with Insecure Permissions | CWE-732 CWE-732: Incorrect Permission Assignment for Critical Resource

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary5.8MEDIUMCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:H/A:L
3.1CNADECLARED5.8MEDIUMCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:H/A:L

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
High
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
Low
Integrity
High
Availability
Low

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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA AsyncHttpClient Async-http-client affected >= 2.0.0, < 2.16.1 Not specified
CNA AsyncHttpClient Async-http-client affected >= 3.0.0, < 3.0.12 Not specified

References

ReferenceSourceLinkTags
github.com/AsyncHttpClient/async-http-client/releases/tag/async-http-cli... [email protected] github.com
github.com/AsyncHttpClient/async-http-client/security/advisories/GHSA-cf... [email protected] github.com
github.com/AsyncHttpClient/async-http-client/commit/d945ce3357b093e74526... [email protected] github.com
github.com/AsyncHttpClient/async-http-client/pull/2281 [email protected] github.com
github.com/AsyncHttpClient/async-http-client/commit/0422e11c954c4b026e98... [email protected] github.com
github.com/AsyncHttpClient/async-http-client/releases/tag/async-http-cli... [email protected] github.com
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NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

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