LightRAG provides simple and fast retrieval-augmented generation. Prior to 1.5.5, the POST /login endpoint in lightrag/api/lightrag_server.py does not impose a rate limit, account lockout, delay, or counter for failed authentication attempts. A network attacker can submit password guesses at full request speed until a valid account password is found. Successful credential recovery grants authenticated access to documents, the knowledge graph, and administrative operations. This issue is fixed in version 1.5.5.
CVE-2026-85734
CRITICALPre-NVD 9.19.1—Trending — 3 sources updated this week
EchelonGraph scoreMEDIUM confidence
This critical-severity CVE scores 9.1 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.6%, top 52% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).
Triggered by: NVD CVSS baseline
Sources: epss, secondary
9.1EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
- High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 9.1Exploit: None knownExposed: 0
No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.
- CVSS v3
- 9.1
- EG Score
- 9.1(medium)
- EG Risk
- 56(Track)EG Risk 56/100SSVC: Track
EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).
How it’s computedSeverity91% × 45%Exploitation1% × 40%Automatability100% × 15%Action: Routine — remediate on your standard cadence. - EPSS PROB
- 1%
- EPSS %ILE
- 48%
- KEV
- Not listed
Published
September 22, 2026
Last Modified
September 22, 2026
Advisory Details (4)
Auto-updated Sep 22, 2026🔬 Proof of concept available. Patch available. Sources: github_pr, github_commit, github_release, github.
github_release Patch Available
v1.5.5
Patch available: HKUDS/LightRAG v1.5.5
https://github.com/HKUDS/LightRAG/releases/tag/v1.5.5github_commit Patch Available
commit 135bc9056e9e (HKUDS/LightRAG)
Patch available: HKUDS/LightRAG v1.5.5 (contains commit 135bc9056e9e)
https://github.com/HKUDS/LightRAG/commit/135bc9056e9ecd800c1abe2f2ce24d1a86622a54github_pr Patch Available
feat(api): rate-limit /login to stop brute-force attacks (GHSA-frch-4w6v-q5xx)
Patch available: HKUDS/LightRAG v1.5.5 (PR #3424 merged 2026-07-18)
https://github.com/HKUDS/LightRAG/pull/3424github Patch Available🟡 PoC Available
No Rate Limiting on /login Endpoint Allows Brute-Force Attacks · Advisory · HKUDS/LightRAG · GitHub
https://github.com/HKUDS/LightRAG/security/advisories/GHSA-frch-4w6v-q5xxVendor Advisories for CVE-2026-85734(1)
These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.
Weakness Classification(1)
MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.
Data Freshness Timeline
(refreshed 7× in last 7d / 7× in last 30d)
Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.
- 2026-09-23 21:29 UTCEG score recompute
- 2026-09-23 17:54 UTCEPSS rescore
- 2026-09-22 18:33 UTCEG score recompute
- 2026-09-22 17:48 UTCEG score recompute
- 2026-09-22 17:36 UTCEG score recompute
- 2026-09-22 16:25 UTCEG score recompute
- 2026-09-22 16:24 UTCMITRE cvelistV5first tracked
Related CVEs(same CWE)
Same CWE
10 shownCWE-307
Frequently asked(5)
What is CVE-2026-85734?
CVE-2026-85734 is a critical vulnerability published on September 22, 2026. LightRAG provides simple and fast retrieval-augmented generation. Prior to 1.5.5, the POST /login endpoint in lightrag/api/lightrag_server.py does not impose a rate limit, account lockout, delay, or counter for failed authentication attempts. A network attacker can submit password guesses at full…
When was CVE-2026-85734 disclosed?
CVE-2026-85734 was first published in the National Vulnerability Database on September 22, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-85734 actively exploited?
CVE-2026-85734 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1% probability of exploitation in the next 30 days, which ranks it in the top 52.1% of all scored CVEs.
What is the CVSS score of CVE-2026-85734?
CVE-2026-85734 has a CVSS v3 base score of 9.1 (NVD).
How do I remediate CVE-2026-85734?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-85734, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.
Dependency Blast Radius
Explore the affected products and dependency analysis for CVE-2026-85734
Is Your Infrastructure Affected by CVE-2026-85734?
EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.