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TI-2025-43963 Aliases CVE-2025-65200GHSA-xgg2-59hm-7r89

Code execution in LocalStack through a crafted hosted template

Priority HIGH 76CWE-79Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
Required
Attack complexity
Low
Impact type
Cross-site scripting
Confidentiality · integrity · availability
High · High · High
Fix status
No fix listed

Attack profile from CVSS 3.1 · CISA ADP. Fix status from CNA. Impact type from CWE-79.

Summary

LocalStack 4.9.2 lets attackers execute arbitrary code in the Docker container. An attacker hosts crafted content on a web-accessible URL and passes that URL as templateURL to the _localstack/cloudformation/deploy endpoint, so the hosted content runs in the container context. The weakness is classified as CWE-79, and the CVSS 3.1 vector requires user interaction.

Written with Claude Haiku 5.5 from the sources below · 2026-10-29

Description from the CNA

An issue was discovered in localstack 4.9.2 allowing attackers to execute arbitrary code via crafted content hosted on a web-accessable URL and when passed said URL in the the templateURL to the _localstack/cloudformation/deploy endpoint, the hosted content can get executed in the context of the docker container.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00551 46th percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
No
Technical impact
Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
——all versions—No fix listedCNA
  • — Vendor— Affected all versions Fixed in — No fix listed CNA

Remediation

The sources list no fixed version for LocalStack.

Written with Claude Haiku 5.5 from the sources below · 2026-10-29

Timeline

  1. 2026-10-22 Threatist record created from CVE-2025-65200
  2. 2026-10-22 Alias added: GHSA-xgg2-59hm-7r89
  3. 2026-10-26 CVSS score added · CISA ADP
  4. 2026-10-26 Weakness changed · CISA ADP
  5. 2026-10-26 CISA SSVC decision points changed
  6. 2026-10-29 CVSS score changed · CISA ADP
  7. 2026-10-29 CISA SSVC decision points changed
  8. 2026-10-29 Priority changed: LOW → HIGH

References

Other 4

Sources

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