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CVE-2026-40087

🗓️ 09 Apr 2026 19:34:55Reported by GitHub_MType 
cve
 cve
🔗 web.nvd.nist.gov👁 5 Views

LangChain prompt templates had incomplete f-string validation enabling unsafe attribute access and nested fields; fixed in 0.3.84 and 1.2.28.

Related
Detection
Affected
Refs
NVD
Vulners
Node
langchainlangchain_coreRange<0.3.84python
OR
langchainlangchain_coreRange1.0.01.2.28python
[
  {
    "vendor": "langchain-ai",
    "product": "langchain",
    "versions": [
      {
        "version": "< 0.3.83",
        "status": "affected"
      },
      {
        "version": ">= 1.0.0a1, < 1.2.28",
        "status": "affected"
      }
    ]
  }
]

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16 Apr 2026 20:48Current
5.9Medium risk
Vulners AI Score5.9
CVSS 3.15.3
EPSS0.00055
SSVC
5