Security Digest · Vulnerability record
CVE-2023-44467: langchain_experimental vulnerable to arbitrary code execution via PALChain in the python exec method
langchainexperimental (aka LangChain Experimental) in LangChain before 0.0.306 allows an attacker to bypass the CVE-2023-36258 fix and execute arbitrary code via import in Python code, which is not prohibited by palchain/base.py.
CVSS 9.8 Critical EPSS 1.0% · p64 Check exposure
Should you act?
Critical and remotely reachable
No known exploitation yet, but it is network-reachable without credentials. This signal is computed from CISA KEV, EPSS and CVSS data; it is not an editorial verdict.
- No confirmed exploitation. It is not in CISA’s KEV catalog. That can change quickly after a public write-up; re-check if you are affected.
- EPSS 1.0%, percentile 64: FIRST’s model estimates a 1.0% chance of exploitation activity in the next 30 days, higher than 64% of all scored CVEs (moderate). EPSS is a probability, not a verdict.
- Remotely reachable with no login and no user interaction. If the vulnerable service is exposed to the internet, prioritize it.
- Only applies if your dependency tree includes
langchain-experimental(PyPI) <= 0.0.14, no fixed version listed. Check your lockfile, including transitive dependencies. - Editorial verdict: Check exposure. LangChain PALChain: Prompt Injection to RCE (CVE-2023-44467) — Only apps that feed untrusted text into PALChain (or similar LLM-to-Python chains) are at risk, but for them it is full code execution, and blocklist fixes kept getting bypassed, so remove the pattern rather than trust the patch.
What it is
langchainexperimental (aka LangChain Experimental) in LangChain before 0.0.306 allows an attacker to bypass the CVE-2023-36258 fix and execute arbitrary code via import in Python code, which is not prohibited by palchain/base.py.
From the GitHub advisory
langchainexperimental (aka LangChain Experimental) in LangChain before 0.0.306 allows an attacker to bypass the CVE-2023-36258 fix and execute arbitrary code via import in Python code, which is not prohibited by palchain/base.py.
Product: langchain-experimental (PyPI) · Assigned by: mitre · Published: 2023-10-09
Affected and fixed versions
| Ecosystem | Package | Vulnerable | First fixed |
|---|---|---|---|
| PyPI | langchain-experimental | <= 0.0.14 | none listed |
| Vendor | Product | Affected versions (per CVE record) |
|---|---|---|
| n/a | n/a | see vendor advisory |
Severity scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| GitHub | 3.1 | 9.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
- Attack vector: network (remotely reachable)
- Attack complexity: low
- Privileges required: none (no login)
- User interaction: none
- Scope: unchanged
CVSS measures how bad a flaw is if exploited, not how likely exploitation is. Read it next to the exploitation data below.
Exploitation and urgency
- CISA KEV: not listed (no confirmed in-the-wild exploitation known to CISA).
- FIRST EPSS (model of 2026-10-21): 1.04% probability of exploitation activity in the next 30 days; percentile 64.
Timeline
- — CVE record published by mitre
- — GitHub-reviewed advisory GHSA-gjjr-63x4-v8cq published (critical)
- — erroneo.us brief: LangChain PALChain: Prompt Injection to RCE (CVE-2023-44467)
- — CVE record last updated
Sources and references
Original sources first. Version and fix details should always be confirmed against the vendor or project advisory.
Vulnerability records
- GitHub Advisory GHSA-gjjr-63x4-v8cq github.com
- CVE.org record CVE-2023-44467 cve.org
- NVD entry CVE-2023-44467 nvd.nist.gov
Other references from the CVE record and advisory
- github.com github.com
- github.com github.com
- github.com github.com
- pypi.org pypi.org