CVE-2026-55443: LangChain is a framework for building agents and LLM-powered applications

Q: How do I fix CVE-2026-55443?

langchain: upgrade to 1.3.9. Exact commands for each OS are on this page.

Q: Is CVE-2026-55443 being exploited?

CVE-2026-55443 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-55443 affect?

CVE-2026-55443 affects langchain. Severity is medium (CVSS 5.1). LangChain is a framework for building agents and LLM-powered applications. Prior to 1.3.9, several LangChain components that resolve filesystem paths or expand search patterns do not consistently confine the resolved path to the intended ro

Q: How urgent is CVE-2026-55443?

Priority 21/100. No elevated risk signals yet.

Routine

MEDIUM 5.1UPGRADE

CVE-2026-55443 is a medium-severity flaw (CVSS 5.1) affecting langchain. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

LangChain is a framework for building agents and LLM-powered applications. Prior to 1.3.9, several LangChain components that resolve filesystem paths or expand search patterns do not consistently confine the resolved path to the intended root directory. Affected behaviors include: a file-search agent middleware that validates a starting directory but not the search pattern or the resolved target of matched files, so glob patterns and symlinks can

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	5.1 (Medium)
Attack vector	Local
Attack complexity	High
Privileges needed	None
User interaction	None
EPSS exploit chance	0.2% (top 89%)
CISA exploited list	No
Weakness	CWE-22, CWE-59
Published	2026-06-22
Last modified	2026-06-26

Publisher (CNA): GitHub, Inc. · Vendor: langchain

Last updated 2026-06-26 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-06-22 19:17 UTCPublished CVE record published
2026-06-26 20:05 UTCUpdated Record last modified

langchain langchain UPGRADE

Affected: < 1.3.9

Fixed in: 1.3.9

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy langchain || rpm -q langchain || langchain --version

2. UPGRADE to 1.3.9 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade langchain

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade langchain

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-55443?

langchain: upgrade to 1.3.9. Exact commands for each OS are on this page.

Is CVE-2026-55443 being exploited?

CVE-2026-55443 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-55443 affect?

CVE-2026-55443 affects langchain. Severity is medium (CVSS 5.1). LangChain is a framework for building agents and LLM-powered applications. Prior to 1.3.9, several LangChain components that resolve filesystem paths or expand search patterns do not consistently confine the resolved path to the intended ro

How urgent is CVE-2026-55443?

Priority 21/100. No elevated risk signals yet.

Software pages

OpenAI and LLM tools vulnerabilities

References

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