CVE-2026-39413: LightRAG provides simple and fast retrieval-augmented generation

Q: How do I fix CVE-2026-39413?

lightrag: upgrade to 1.4.14. Exact commands for each OS are on this page.

Q: Is CVE-2026-39413 being exploited?

CVE-2026-39413 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-2026-39413 affect?

CVE-2026-39413 affects lightrag. Severity is medium (CVSS 4.2). LightRAG provides simple and fast retrieval-augmented generation. Prior to 1.4.14, the LightRAG API is vulnerable to a JWT algorithm confusion attack where an attacker can forge tokens by specifying 'alg': 'none' in the JWT header. Since th

Q: How urgent is CVE-2026-39413?

Priority 21/100. Public exploit reference

Routine

MEDIUM 4.2UPGRADE

CVE-2026-39413 is a medium-severity flaw (CVSS 4.2) affecting lightrag. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

LightRAG provides simple and fast retrieval-augmented generation. Prior to 1.4.14, the LightRAG API is vulnerable to a JWT algorithm confusion attack where an attacker can forge tokens by specifying 'alg': 'none' in the JWT header. Since the jwt.decode() call does not explicitly deny the 'none' algorithm, a crafted token without a signature will be accepted as valid, leading to unauthorized access. This vulnerability is fixed in 1.4.14.

Why this priority

Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	4.2 (Medium)
Attack vector	Network (remote)
Attack complexity	High
Privileges needed	High
User interaction	Required
EPSS exploit chance	0.2% (top 93%)
CISA exploited list	No
Weakness	CWE-347
Published	2026-04-08
Last modified	2026-07-24

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

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

Am I affected?

Timeline

2026-04-08 20:16 UTCPublished CVE record published
2026-07-24 21:10 UTCUpdated Record last modified

hkuds lightrag UPGRADE

Affected: < 1.4.14

Fixed in: 1.4.14

Safe to downgrade to: no unaffected older release

1. Check installed version

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

2. UPGRADE to 1.4.14 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade lightrag

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-2026-39413?

lightrag: upgrade to 1.4.14. Exact commands for each OS are on this page.

Is CVE-2026-39413 being exploited?

CVE-2026-39413 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-2026-39413 affect?

CVE-2026-39413 affects lightrag. Severity is medium (CVSS 4.2). LightRAG provides simple and fast retrieval-augmented generation. Prior to 1.4.14, the LightRAG API is vulnerable to a JWT algorithm confusion attack where an attacker can forge tokens by specifying 'alg': 'none' in the JWT header. Since th

How urgent is CVE-2026-39413?

Priority 21/100. Public exploit reference

References

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