CVE-2026-118383

CRITICALNVD 10.010.0
EchelonGraph scoreMEDIUM confidence

“—” beside the score: it is equal to NVD's CVSS score.

This critical-severity CVE scores 10.0 under NVD CVSS v3. EPSS exploit probability: 0.7% (55th percentile of EPSS-scored CVEs). GitHub Security Advisory CVSS 9.0 is lower than this score; a lower GitHub score revises it only when its advisory is newer than the CVE record's last change, and this advisory (published 2026-11-10) is not newer than that change (2026-11-13), so it does not.

Triggered by: Headline CVSS from NVD CVSS v3
Sources: EPSS, GitHub Security Advisory, NVD CVSS v3
Elevated

Also known asEUVD-2026-122846 (ENISA EUVD) · GHSA-fjxh-6vgh-cx2c (GitHub Security Advisories)Source: ENISA EUVD

10.0EG
EchelonGraph verdictPlan mitigationNo release containing the referenced fix is confirmed: check the referenced fix and the vendor's advisory for a release that contains it; until one is applied, restrict network exposure of the affected system or apply the vendor's mitigation on your normal schedule (the SSVC decision on this page).
  • Public exploit or proof-of-concept code is available
CISA-KEV: Not listedEPSS PROB: 0.7%CVSS: 10.0Exploit: Public PoCExposed services: Not assessed

A fix is referenced (a reference tagged "Patch", often a source commit), but no release containing it is confirmed — find the release that contains it; until it is applied, mitigate (WAF / firewall / segmentation).

A use-after-free in the replication component of MongoDB Server can occur when a newly elected replica set primary completes catch-up. The condition can be caused by requests that do not require authentication, and may result in the server terminating unexpectedly or, under certain conditions, arbitrary code execution in the context of the server process. Replica set members are affected, including the shard and config server replica set members of sharded clusters; standalone mongod instances are not.

CVSS v3
10.0
EG Score
10.0CRITICALmedium confidence
EG Risk
61
EG Risk 61/100

EG Risk is EchelonGraph's 0–100 priority score. It fuses impact severity (EG Severity, the CVSS base score, never the KEV-floored or EPSS-lifted EG Score) with real-world exploitation and automatability, under weights EchelonGraph set by hand, so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner.

How it’s computed (value × EchelonGraph’s weight)
Severity100% × 45%
Impact severity (EG Severity): CVSS 10.0 of 10. Never the KEV-floored or EPSS-lifted EG Score.
Exploitation40% × 40%
EchelonGraph's fixed weight for EG-KEV Tier 3 (Elevated): a constant, not a probability.
Automatability0% × 15%
CISA's SSVC Automatable value: no (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at low or medium mission impact; Track* at high (mission-essential systems).
Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE.
Action: A fix is referenced, but no release containing it is confirmed. Check the referenced fix and the vendor's advisory for a release that contains it; until one is applied, restrict network exposure of the affected system or apply the vendor's mitigation on your normal schedule.
EPSS PROB
0.7%
EPSS %ILE
55th
KEV
Not listed

What the EG score is made of (scorer v4.0: the three questions the 0–10 score mixes, published apart · methodology)

The EG score (10.0): severity, escalated by confirmed exploitation. This CVE's 10.0 is its impact severity (EG Severity), not escalated.

EG Severity
10.0 CRITICALCVSS-B, impact only: no KEV listing, EPSS or EG-KEV tier raises it.NVD CVSS v3 · CVSS v3.0 or v3.1
EG Likelihood
0.7% within 30 daysSource: FIRST EPSS (model v2026.06.15, score date 2026-11-14). FIRST's exploitation probability, not an EchelonGraph model.
Confirmed exploitation
None on record (CISA KEV, EG-KEV Tier 1)Reported apart from the likelihood: an observed fact, not a probability.
EG Priority
SSVC Track at medium mission impactTrack at low or medium mission impact; Track* at high (mission-essential systems).CISA BOD 26-04: 14 days if the affected system is publicly exposed; Fix on system upgrade if it is not.No released fix is confirmed on this page, but CISA's timeline does not wait for a fix's release: it starts when an agency identifies the flaw on an asset and updates the CDM Agency and Federal Dashboard, and the directive counts patching, decommissioning the system or another action as remediation. Until a fixed release is applied, mitigate as this page's verdict says. In the directive's words, “Fix on system upgrade” means that, “unless conditions change”, the vulnerability “should be remediated the next time the vulnerable asset receives a scheduled major upgrade or rebuild”: its timelines are “dynamic as facts change”, and a KEV listing shortens them.Each input and its source, and whom BOD 26-04 binds: the SSVC and BOD 26-04 blocks below.

SSVC (CISA's decision table, applied by EchelonGraph)Track at low or medium mission impact; Track* at high (mission-essential systems).

A fix is referenced, but no release containing it is confirmed. Check the referenced fix and the vendor's advisory for a release that contains it; until one is applied, restrict network exposure of the affected system or apply the vendor's mitigation on your normal schedule.

Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE. Mission impact is CISA's Mission & Well-being decision point, and only you can judge it. CISA's table makes it high when Mission Prevalence is Essential — the vulnerable component "directly provides capabilities that constitute at least one MEF for at least one entity" (MEF: mission essential function) — or when Public Well-Being Impact is Irreversible: "multiple fatalities are likely", the cyber-physical system "is likely lost or destroyed", "extreme or serious externalities" are imposed on other parties, or social systems such as elections or the financial grid "are destabilized and potentially collapse". CISA's decision table

BOD 26-04 (CISA's remediation timeline, Table 1)14 days if the affected system is publicly exposed; Fix on system upgrade if it is not.

No released fix is confirmed on this page, but CISA's timeline does not wait for a fix's release: it starts when an agency identifies the flaw on an asset and updates the CDM Agency and Federal Dashboard, and the directive counts patching, decommissioning the system or another action as remediation. Until a fixed release is applied, mitigate as this page's verdict says. In the directive's words, “Fix on system upgrade” means that, “unless conditions change”, the vulnerability “should be remediated the next time the vulnerable asset receives a scheduled major upgrade or rebuild”: its timelines are “dynamic as facts change”, and a KEV listing shortens them.

The score's inputs: In CISA KEV no (CISA's KEV catalog) · Automatable no (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). Whether your system is publicly exposed is yours to answer. BOD 26-04 binds US Federal Civilian Executive Branch agencies; for anyone else it is CISA's published timeline, a reference rather than an obligation. The directive · how EchelonGraph applies it

Published

November 10, 2026

Last Modified

November 13, 2026

Advisory Details (2)

Auto-updated Nov 13, 2026
Fix referenced — no release confirmed yet.

Vendor Advisories for CVE-2026-118383(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 18× in last 7d / 18× in last 30d)

Each row is a time one of our pipelines fetched, updated or re-scored this CVE. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed its CVE.org record (CNA or CISA ADP). An arrow marks a change the record states ("CVSS v3 → 9.1"); EPSS and GHSA rows show the values recorded at that time, not what changed (EPSS values are rounded; hover one for the exact figures). "EchelonGraph re-scored" is our own recompute of this CVE's score, not an update from a source, and is not counted in the refreshes above. Most recent first.

  1. 2026-11-14 18:25 UTCEchelonGraph re-scored
  2. 2026-11-14 18:25 UTCGHSA enrichmentGHSA-fjxh-6vgh-cx2c · GitHub severity CRITICAL · GitHub CVSS 9.0
  3. 2026-11-14 16:39 UTCEPSS rescoreEPSS 0.7% · 55th percentile
  4. 2026-11-13 16:53 UTCEchelonGraph re-scored
  5. 2026-11-13 16:53 UTCGHSA enrichmentGHSA-fjxh-6vgh-cx2c · GitHub severity CRITICAL · GitHub CVSS 9.0
  6. 2026-11-13 16:50 UTCEPSS rescoreEPSS 0.7% · 54th percentile
  7. 2026-11-13 16:37 UTCGHSA enrichmentGHSA-fjxh-6vgh-cx2c · GitHub severity CRITICAL · GitHub CVSS 9.0
  8. 2026-11-13 16:13 UTCEchelonGraph re-scored▲ 1.00
  9. 2026-11-13 16:13 UTCGHSA enrichmentGHSA-fjxh-6vgh-cx2c · GitHub severity CRITICAL · GitHub CVSS 9.0
  10. 2026-11-13 16:07 UTCNVD updateCVSS v3 → 10
  11. 2026-11-13 15:29 UTCEchelonGraph re-scored
  12. 2026-11-13 15:29 UTCGHSA enrichmentGHSA-fjxh-6vgh-cx2c · GitHub severity CRITICAL · GitHub CVSS 9.0
  13. 2026-11-13 14:23 UTCEchelonGraph re-scored
  14. 2026-11-13 14:23 UTCGHSA enrichmentGHSA-fjxh-6vgh-cx2c · GitHub severity CRITICAL · GitHub CVSS 9.0
  15. 2026-11-13 05:51 UTCEchelonGraph re-scored
  16. 2026-11-13 05:51 UTCGHSA enrichmentGHSA-fjxh-6vgh-cx2c · GitHub severity CRITICAL · GitHub CVSS 9.0
  17. 2026-11-12 16:33 UTCEPSS rescoreEPSS 0.7% · 54th percentile
  18. 2026-11-12 04:20 UTCEchelonGraph re-scored
  19. 2026-11-12 04:20 UTCGHSA enrichmentGHSA-fjxh-6vgh-cx2c · GitHub severity CRITICAL · GitHub CVSS 9.0
  20. 2026-11-11 16:38 UTCEPSS rescoreEPSS 0.7% · 54th percentile
  21. 2026-11-11 02:40 UTCGHSA enrichmentGHSA-fjxh-6vgh-cx2c · GitHub severity CRITICAL · GitHub CVSS 9.0
  22. 2026-11-10 22:29 UTCGHSA enrichmentGHSA-fjxh-6vgh-cx2c · GitHub severity CRITICAL · GitHub CVSS 9.0
  23. 2026-11-10 21:56 UTCEchelonGraph re-scored
  24. 2026-11-10 21:56 UTCGHSA enrichmentGHSA-fjxh-6vgh-cx2c · GitHub severity CRITICAL · GitHub CVSS 9.0
  25. 2026-11-10 21:28 UTCEchelonGraph re-scored
Show 3 more
  1. 2026-11-10 21:00 UTCENISA EUVD ID recordedEUVD-2026-122846 · Source: ENISA EUVD
  2. 2026-11-10 20:30 UTCEchelonGraph re-scoredFirst assessed: 9.0 CRITICAL
  3. 2026-11-10 20:29 UTCMITRE cvelistV5first tracked

Publicly available exploits

(1 reference)

Public exploit code is referenced for this CVE (1 GitHub PoC). No release with the fix is confirmed, so defenders should restrict or isolate affected systems accordingly until one is applied.

  • GitHub PoCgooglesky/CVE-2026-118383
    Published Nov 11, 2026

    PoC for CVE-2026-118383 — MongoDB unauthenticated use-after-free in ReplicationCoordinatorImpl::CatchupState during primary catch-up via readConcern.afterOpTime waiter poisoning, with deterministic crash oracle and fixed-version control.

    Open source ↗

Frequently asked(5)

What is CVE-2026-118383?
CVE-2026-118383 is a critical-severity vulnerability; its CVE record was published on November 10, 2026. A use-after-free in the replication component of MongoDB Server can occur when a newly elected replica set primary completes catch-up. The condition can be caused by requests that do not require authentication, and may result in the server terminating unexpectedly or, under certain conditions,…
When was the CVE record for CVE-2026-118383 published?
The CVE record for CVE-2026-118383 was published on November 10, 2026. That is the record's publication date; the vulnerability itself may have been made public earlier. EchelonGraph's copy of the record carries a last-modified date of November 13, 2026; the record at its source may have been updated since.
Is CVE-2026-118383 actively exploited?
CVE-2026-118383 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.7% probability of exploitation in the next 30 days (55th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-118383?
CVE-2026-118383 has a CVSS v3 base score of 10.0 (NVD).
How do I remediate CVE-2026-118383?
A fix for CVE-2026-118383 is referenced (a reference tagged "Patch", often a source commit), but EchelonGraph has no release containing it on record. Check that reference and the vendor's advisory for a release that contains the fix and update to it; until then, restrict network exposure of the affected system or apply the vendor's mitigation. The vendor advisories EchelonGraph has for CVE-2026-118383 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

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