Shared JSR-223 ScriptEngine evaluated concurrently without THREADING check

Description

A single ScriptEngine instance is reused for every message on a script-backed channel. For JSR-223 engines that report THREADING=null (not thread-safe, e.g. the Kotlin kts engine), concurrent message processing can corrupt engine-internal state, potentially leaking one message's payload/headers bindings into another message's script evaluation or throwing spurious exceptions. Spring Integration 7.1.0 Spring Integration 7.0.0 - 7.0.5 Spring Integration 6.5.0 - 6.5.10 Spring Integration 6.4.0 - 6.4.12 Spring Integration 5.5.21 and earlier

Scores

EPSS (exploitation in 30 days)

0.18% · top 93% of all CVEs (6 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 4.2.

Weakness

• CWE-362 Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')
• CWE-362 Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition') (opens in a new tab)All about CWE-362 and its CVEs

Affected products

• Spring · Spring Integration

  • affected 7.1.0
  • affected 7.0.0 – ≤ 7.0.5
  • affected 6.5.0 – ≤ 6.5.10
  • affected 6.4.0 – ≤ 6.4.12
  • affected ≤ 5.5.21

References (1)

• https://spring.io/security/cve-2026-59321 (opens in a new tab)

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

[![CVE-2026-59321](https://trackcve.app/badge/CVE-2026-59321.svg)](https://trackcve.app/cve/CVE-2026-59321)

Record last updated 28 Aug 2026, 22:46 UTC.