CVE-2026-61740: LightRAG provides simple and fast retrieval-augmented generation

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CRITICAL 9.3REMOTE

CVE-2026-61740 is a critical-severity flaw (CVSS 9.3) affecting affected software. 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 1.5.4, when LightRAG is deployed with LIGHTRAG_API_KEY set but AUTH_ACCOUNTS unset, X-API-Key protection can be bypassed because lightrag/api/auth.py falls back to a hardcoded DEFAULT_TOKEN_SECRET, /auth-status and /login can mint guest JWTs, and combined_dependency in lightrag/api/utils_api.py accepts a valid guest token before checking the API key. A remote unauthenticat

Why this priority

Critical severity
CISA SSVC: public proof of concept
CISA SSVC: automatable with total technical impact
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	9.3 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.7% (top 49%)
CISA exploited list	No
Weakness	CWE-287, CWE-798
Published	2026-07-15
Last modified	2026-10-24

Publisher (CNA): GitHub, Inc.

Last updated 2026-10-24 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Timeline

2026-07-15 15:16 UTCPublished CVE record published
2026-10-24 21:10 UTCUpdated Record last modified

Exact fixes by distribution

Python (pip) · lightrag-hku · FIXED · 1.5.4 · vulnerable: < 1.5.4 · source

pip install --upgrade "lightrag-hku>=1.5.4" pip show lightrag-hku

Fedora 46 · perl-Alien-Brotli · FIXED · 0.2.2-16.fc46 · FEDORA-2026-a2abe3db79 · source

sudo dnf upgrade --advisory=FEDORA-2026-a2abe3db79

Fedora ELN · mariadb-connector-odbc · FIXED · 3.2.10-1.eln159 · FEDORA-2026-b481dcd597 · source

sudo dnf upgrade --advisory=FEDORA-2026-b481dcd597

Public exploits and detection

Public code exists for this CVE. Treat unpatched systems as at risk, and only run PoCs in a lab.

Write-up: github.com/HKUDS/LightRAG/security/advisories/GHSA-f4vv-55c2-5789

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-2026-61740?

No fixed release is listed yet. Watch the vendor advisory and apply any mitigation shown on this page.

Is CVE-2026-61740 being exploited?

CVE-2026-61740 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-2026-61740 affect?

CVE-2026-61740 affects affected software. Severity is critical (CVSS 9.3). LightRAG provides simple and fast retrieval-augmented generation. Prior to 1.5.4, when LightRAG is deployed with LIGHTRAG_API_KEY set but AUTH_ACCOUNTS unset, X-API-Key protection can be bypassed because lightrag/api/auth.py falls back to a

How urgent is CVE-2026-61740?

Priority 56/100. Critical severity; CISA SSVC: public proof of concept; CISA SSVC: automatable with total technical impact; Remotely exploitable, no login, no user action

References

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