CVE-2026-75130 json
Context7 2.1.2 Prompt Injection via Custom AI Instructions
published 2mo ago modified 20d ago also EUVD-2026-61099
- cvss
- 9.0
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.5%
- EPSS 0.5% chance of exploitation in 30 days, percentile 42%
- public exploits
- 0
- none known
Summary
Context7 through 2.1.2 contains a prompt injection vulnerability that allows attackers to execute malicious instructions in connected AI coding agents by injecting unsanitized content through the Custom AI Instructions feature served via the MCP server. Attackers can poison the custom instructions to exfiltrate credentials from environment files to an attacker-controlled service and perform destructive file deletion on the victim's machine when the agent makes a routine library documentation request.
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Check with FencerCISA SSVC
- Exploitation
- none
- Automatable
- no
- Technical impact
- total
- Assessed
- 2mo ago
Exploit prediction
0.49% chance of exploitation in the next 30 days, higher than 42% of all scored CVEs (FIRST EPSS, 2026-11-11).
Exploits and checks
- noma.security https://noma.security/blog/contextcrush-context7-the-mcp-server-vulnerability/ referenced PoC, tagged "exploit" by a source, unverified
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 4.0 | 6.4 | CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:N/VA:N/SC:H/SI:H/SA:H |
| CNA | 3.1 | 9.0 | CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H |
| CNA | 4.0 | 6.4 | CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:N/VA:N/SC:H/SI:H/SA:H/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X |
Affected products
- Uptash Context7
Classification
- Weakness
-
- CWE-1427 Improper Neutralization of Input Used for LLM Prompting
References
-
noma.security
/blog/contextcrush-context7-the-mcp-server-vulnerability/
technical-description, exploit
-
linkedin.com
/posts/upstash_mcp-server-vulnerability-in-context-7-activity-7435686676049387520-PBVo/
vendor-advisory
-
vulncheck.com
/advisories/context7-prompt-injection-via-custom-ai-instructions
third-party-advisory
Sources
- CVE List CVE-2026-75130
- NVD CVE-2026-75130
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