CVE-2026-44843: LangChain is a framework for building agents and LLM-powered applications

This month

HIGH 8.2REMOTEUPGRADE

CVE-2026-44843 is a high-severity flaw (CVSS 8.2) 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 0.3.85 and 1.3.3, LangChain contains older runtime code paths that deserialize run inputs, run outputs, or other application-controlled payloads using overly broad object allowlists. These paths may call load() with allowed_objects="all". This does not enable arbitrary Python object deserialization, but it does allow any trusted LangChain-serializable object to be

Why this priority

High severity
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	8.2 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.4% (top 65%)
CISA exploited list	No
Weakness	CWE-502
Published	2026-05-26
Last modified	2026-07-24

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

Last updated 2026-07-24 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-05-26 21:16 UTCPublished CVE record published
2026-07-24 11:10 UTCUpdated Record last modified

langchain langchain UPGRADE

Affected: < 0.3.85 · >= 1.0.0 and < 1.3.3

Fixed in: 0.3.85, 1.3.3

Safe to downgrade to: a release before 1.0.0

1. Check installed version

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

2. UPGRADE to 0.3.85 (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.

3. If no update is available yet, DOWNGRADE to a release before 1.0.0 (Debian / Ubuntu)

apt-cache madison langchain sudo apt install langchain=<VERSION_BEFORE_1.0.0> sudo apt-mark hold langchain

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list langchain sudo dnf downgrade langchain-<VERSION_BEFORE_1.0.0> sudo dnf versionlock add langchain

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

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-2026-44843?

langchain: upgrade to 0.3.85, 1.3.3. Exact commands for each OS are on this page.

Is CVE-2026-44843 being exploited?

CVE-2026-44843 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-2026-44843 affect?

CVE-2026-44843 affects langchain. Severity is high (CVSS 8.2). LangChain is a framework for building agents and LLM-powered applications. Prior to 0.3.85 and 1.3.3, LangChain contains older runtime code paths that deserialize run inputs, run outputs, or other application-controlled payloads using overl

How urgent is CVE-2026-44843?

Priority 42/100. High severity; Remotely exploitable, no login, no user action

Software pages

Python vulnerabilities · OpenAI and LLM tools vulnerabilities

Related CVEs

CVE-2026-55443 MEDIUM 5.1 UPGRADE LangChain is a framework for building agents and LLM-powered applications

References

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