CVE-2023-39631

Exp

An issue in LanChain-ai Langchain v.0.0.245 allows a remote attacker to execute arbitrary code via the evaluate function in the numexpr library.

Published: 2023-09-01 Last update: 2026-06-17 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2023-39631 is rated High Exploit Risk (77.2/100): CVSS Critical severity, with medium exploitation likelihood (EPSS 1.32%). 2 public exploit reference(s) are indexed (Exploit-DB). Public exploits are available—assess exposure, apply mitigations, and prioritize patching.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Public exploit references (Exploit-DB) for CVE-2023-39631

EDB-ID Source Kind Published Link
— nvd_ref exploit_tag Exploit-DB ↗
— nvd_ref exploit_tag Exploit-DB ↗

Exploit prediction scoring system (EPSS) score for CVE-2023-39631

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-06-15 1.75% 1.32% -0.43%
2 2026-05-27 1.58% 1.75% +0.17%
3 2026-04-12 — 1.58% —

Full EPSS history (18 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2023-39631

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
9.8 3.1 CRITICAL
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:H)
They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 3.9 5.9 [email protected]

Weakness enumeration for CVE-2023-39631

GitHub Security Advisory for CVE-2023-39631

GHSA-f73w-4m7g-ch9x · Severity: critical · Ecosystem: pip — Langchain vulnerable to arbitrary code execution via the evaluate function in the numexpr library

Affected software / configurations for CVE-2023-39631

Vendor Product Version Raw CPE
langchain langchain 0.0.245 cpe:2.3:a:langchain:langchain:0.0.245:*:*:*:*:*:*:*

References for CVE-2023-39631

URL Tags
https://github.com/langchain-ai/langchain/issues/8363 Exploit Issue Tracking Patch Third Party Advisory
https://github.com/pydata/numexpr/issues/442 Exploit Issue Tracking Patch Third Party Advisory
cvelogic Threat Intelligence