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TI-2026-80466 Aliases CVE-2026-116367GHSA-87qr-qp63-3pcq

Access control flaw in DeepSeek sandbox createContext

Priority MEDIUM 57CWE-264Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
Passive
Attack complexity
Low
Attack requirements
None
Impact type
Security bypass
Confidentiality · integrity · availability
Low · Low · Low
Fix status
No fix listed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-264.

Summary

DeepSeek up to and including 0.1.0-rc.5 contains a flaw in the createContext function of sandbox.ts. The flaw is classified as a privilege issue (CWE-265), and the source describes its effect only as a sandbox issue. A remote attacker can launch the attack, and the CVSS vector indicates that user interaction is needed.

Written with Claude Haiku 5.5 from the sources below · 2026-11-02

Description from the CNA

A vulnerability was found in DeepSeek Harness up to 0.1.0-rc.5. This vulnerability affects the function createContext of the file packages/extensions/cordis-host-runner/src/sandbox.ts. The manipulation results in sandbox issue. It is possible to launch the attack remotely. The vendor was contacted early about this disclosure but did not respond in any way.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00294 22nd 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
Partial

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

Affected products

VendorProductAffected versionsFixed inStatusSource
DeepSeekHarness0.1.0-rc.0; 0.1.0-rc.1; 0.1.0-rc.2; 0.1.0-rc.3; 0.1.0-rc.4; 0.1.0-rc.5—No fix listedCNA
  • Harness VendorDeepSeek Affected 0.1.0-rc.0; 0.1.0-rc.1; 0.1.0-rc.2; 0.1.0-rc.3; 0.1.0-rc.4; 0.1.0-rc.5 Fixed in — No fix listed CNA

CPE names CNA · 1

CPEVersionsRoleVendor
cpe:2.3:a:deepseek:harness:*:*:*:*:*:*:*:*——DeepSeek
  • cpe:2.3:a:deepseek:harness:*:*:*:*:*:*:*:* Versions — — ·DeepSeek

Remediation

The sources list no fixed version for DeepSeek.

Written with Claude Haiku 5.5 from the sources below · 2026-11-02

Timeline

  1. 2026-10-26 Threatist record created from CVE-2026-116367
  2. 2026-10-27 Alias added: GHSA-87qr-qp63-3pcq
  3. 2026-11-02 CISA SSVC decision points changed
  4. 2026-11-02 Priority changed: LOW → MEDIUM

References

—

  • TI-2025-19267 DeepSeek R1 through V3.1 allows XSS, as demonstrated by JavaScript execution in the… CVSS 3.1HIGH 8.8
  • TI-2026-65141 DeepSeek deepseek-harness Bundle Patch profile.ts loadProfile path traversal CVSS 4.0LOW 2.3
  • TI-2026-56891 DeepSeek Harness < 0.1.2-alpha.1 Authentication Bypass via Host Header Spoofing CVSS 4.0CRITICAL 9.4
  • TI-2026-80467 Improper authorization in DeepSeek browser authentication CVSS 4.0MEDIUM 6.9
  • TI-2025-39472 DeepSeek V3.2 has a Cross Site Scripting (XSS) vulnerability, which allows JavaScript… CVSS 3.1MEDIUM 6.1

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences