CVE-2026-84970

MEDIUMNVD 5.86.2
EchelonGraph scoreMEDIUM confidence

“▲” beside the score: it is higher than NVD's CVSS score.

Score 6.2 from GitHub Security Advisory (severity: MODERATE) published 2026-09-03. NVD baseline CVSS 5.8; sources differ by 0.4.

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

Also known asEUVD-2026-70505 (ENISA EUVD) · GHSA-j94p-2ppx-483m (GitHub Security Advisories)Source: ENISA EUVD

6.2EG
EchelonGraph verdictMonitorRemediate within your standard update timelines (the SSVC decision on this page).
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0.1%CVSS: 5.8Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

A numeric truncation weakness exists in the JSON parsing component of the MongoDB C++ Driver's BSON library. An actor who controls the text that an embedding application hands to the library's public JSON parsing interface, when that text is very large, can cause the library to read memory beyond the supplied buffer and return it to the caller, to silently accept only part of the input as a complete document, or to terminate the process. No MongoDB server, credentials, or non-default configuration is required; the effect is confined to the process that uses the library.

CVSS v3
5.8
EG Score
6.2MEDIUMmedium confidence
EG Risk
28
EG Risk 28/100

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)
Severity62% × 45%
Impact severity (EG Severity): CVSS 6.2 of 10. Never the KEV-floored or EPSS-lifted EG Score.
Exploitation0.1% × 40%
FIRST EPSS: the 30-day exploitation probability when EchelonGraph scored this CVE.
Automatability0% × 15%
CISA's SSVC Automatable value: no (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at every mission impact level.
Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (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 available. Apply it within your standard update timelines.
EPSS PROB
0.1%
EPSS %ILE
2nd
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 (6.2): severity, escalated by confirmed exploitation. This CVE's 6.2 is its impact severity (EG Severity), not escalated.

EG Severity
6.2 MEDIUMCVSS-B, impact only: no KEV listing, EPSS or EG-KEV tier raises it.GitHub Security Advisory CVSS
EG Likelihood
0.1% within 30 daysSource: FIRST EPSS (model v2026.06.15, score date 2026-11-07). 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 every mission impact level.CISA BOD 26-04: 60 days if the affected system is publicly exposed; Fix on system upgrade if it is not.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 every mission impact level.

A fix is available. Apply it within your standard update timelines.

Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (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)60 days if the affected system is publicly exposed; Fix on system upgrade if it is not.

The score's inputs: In CISA KEV no (CISA's KEV catalog) · Automatable no (CISA Vulnrichment) · Technical impact partial (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

September 3, 2026

Last Modified

September 10, 2026

Advisory Details (1)

Auto-updated Sep 3, 2026
Patch available.
Web page

SAML Login - MongoDB Jira - MongoDB Jira

https://jira.mongodb.org/browse/CXX-3547

Vendor Advisories for CVE-2026-84970(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Affected Packages

(1 across 1 ecosystem)
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
mongo-cxx-driver3.10.1-1 ... 4.5.1-1 (21 versions)
  • every version up to 4.5.2-1: fixed in 4.5.2-1
—

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 8× in last 7d / 29× 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.

Showing the most recent 100 of 141 rows on record for this CVE.

A repeat, a row identical to one the same pipeline wrote less than 10 seconds earlier, is not a separate refresh and is not counted. None are among the latest 100 rows. The 41 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-11-13 16:57 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  2. 2026-11-12 16:34 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  3. 2026-11-11 16:41 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  4. 2026-11-10 16:45 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  5. 2026-11-09 16:36 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  6. 2026-11-08 16:41 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  7. 2026-11-07 19:15 UTCGHSA enrichmentGHSA-j94p-2ppx-483m · GitHub severity MODERATE · GitHub CVSS 6.2
  8. 2026-11-07 19:15 UTCEchelonGraph re-scored
  9. 2026-11-07 16:40 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  10. 2026-11-06 16:39 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  11. 2026-11-05 16:38 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  12. 2026-11-04 16:37 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  13. 2026-11-03 16:49 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  14. 2026-11-02 16:46 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  15. 2026-10-31 16:33 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  16. 2026-10-30 16:35 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  17. 2026-10-30 00:25 UTCOSV refresh
  18. 2026-10-29 16:34 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  19. 2026-10-26 16:32 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  20. 2026-10-25 16:34 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  21. 2026-10-25 13:55 UTCEchelonGraph re-scored
  22. 2026-10-24 16:33 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  23. 2026-10-23 16:32 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  24. 2026-10-22 16:35 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  25. 2026-10-22 12:55 UTCEchelonGraph re-scored
Show 75 more
  1. 2026-10-22 12:55 UTCGHSA enrichmentGHSA-j94p-2ppx-483m · GitHub CVSS 6.2
  2. 2026-10-21 16:34 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  3. 2026-10-20 16:33 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  4. 2026-10-19 16:33 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  5. 2026-10-18 16:33 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  6. 2026-10-18 03:06 UTCEchelonGraph re-scored
  7. 2026-10-16 16:44 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  8. 2026-10-15 16:33 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  9. 2026-10-14 16:33 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  10. 2026-10-13 16:35 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  11. 2026-10-12 16:35 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  12. 2026-10-12 14:53 UTCEchelonGraph re-scored
  13. 2026-10-11 19:18 UTCEchelonGraph re-scored
  14. 2026-10-11 16:34 UTCEchelonGraph re-scored
  15. 2026-10-11 13:52 UTCEchelonGraph re-scored
  16. 2026-10-11 13:49 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  17. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  18. 2026-10-10 00:01 UTCEchelonGraph re-scored
  19. 2026-10-10 00:01 UTCGHSA enrichmentGHSA-j94p-2ppx-483m · GitHub CVSS 6.2
  20. 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  21. 2026-10-09 01:31 UTCEchelonGraph re-scored
  22. 2026-10-09 01:31 UTCGHSA enrichmentGHSA-j94p-2ppx-483m · GitHub CVSS 6.2
  23. 2026-10-08 17:13 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  24. 2026-10-07 23:31 UTCGHSA enrichmentGHSA-j94p-2ppx-483m · GitHub CVSS 6.2
  25. 2026-10-06 18:25 UTCEchelonGraph re-scored
  26. 2026-10-06 18:25 UTCGHSA enrichmentGHSA-j94p-2ppx-483m · GitHub CVSS 6.2
  27. 2026-10-06 15:18 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  28. 2026-10-05 19:55 UTCEchelonGraph re-scored
  29. 2026-10-05 19:55 UTCGHSA enrichmentGHSA-j94p-2ppx-483m · GitHub CVSS 6.2
  30. 2026-10-05 17:43 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  31. 2026-10-04 23:22 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  32. 2026-10-04 21:26 UTCGHSA enrichmentGHSA-j94p-2ppx-483m · GitHub CVSS 6.2
  33. 2026-10-03 22:56 UTCEchelonGraph re-scored
  34. 2026-10-03 22:56 UTCGHSA enrichmentGHSA-j94p-2ppx-483m · GitHub CVSS 6.2
  35. 2026-10-03 14:26 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  36. 2026-10-03 00:24 UTCEchelonGraph re-scored
  37. 2026-10-03 00:24 UTCGHSA enrichmentGHSA-j94p-2ppx-483m · GitHub CVSS 6.2
  38. 2026-10-02 17:57 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  39. 2026-10-02 00:31 UTCEchelonGraph re-scored
  40. 2026-10-02 00:31 UTCGHSA enrichmentGHSA-j94p-2ppx-483m · GitHub CVSS 6.2
  41. 2026-10-01 19:50 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  42. 2026-10-01 01:26 UTCEchelonGraph re-scored
  43. 2026-10-01 01:26 UTCGHSA enrichmentGHSA-j94p-2ppx-483m · GitHub CVSS 6.2
  44. 2026-09-30 15:04 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  45. 2026-09-30 02:57 UTCEchelonGraph re-scored
  46. 2026-09-30 02:57 UTCGHSA enrichmentGHSA-j94p-2ppx-483m · GitHub CVSS 6.2
  47. 2026-09-28 23:54 UTCEchelonGraph re-scored
  48. 2026-09-28 23:54 UTCGHSA enrichmentGHSA-j94p-2ppx-483m · GitHub CVSS 6.2
  49. 2026-09-28 13:52 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  50. 2026-09-28 01:22 UTCEchelonGraph re-scored
  51. 2026-09-28 01:22 UTCGHSA enrichmentGHSA-j94p-2ppx-483m · GitHub CVSS 6.2
  52. 2026-09-27 13:48 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  53. 2026-09-27 02:52 UTCEchelonGraph re-scored
  54. 2026-09-27 02:52 UTCGHSA enrichmentGHSA-j94p-2ppx-483m · GitHub CVSS 6.2
  55. 2026-09-26 15:59 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  56. 2026-09-26 04:21 UTCEchelonGraph re-scored
  57. 2026-09-26 04:21 UTCGHSA enrichmentGHSA-j94p-2ppx-483m · GitHub CVSS 6.2
  58. 2026-09-24 21:58 UTCEchelonGraph re-scored
  59. 2026-09-24 21:58 UTCGHSA enrichmentGHSA-j94p-2ppx-483m · GitHub CVSS 6.2
  60. 2026-09-24 14:04 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  61. 2026-09-23 23:25 UTCEchelonGraph re-scored
  62. 2026-09-23 23:25 UTCGHSA enrichmentGHSA-j94p-2ppx-483m · GitHub CVSS 6.2
  63. 2026-09-23 17:54 UTCEPSS rescoreEPSS <0.1% · below the 1st percentile
  64. 2026-09-23 00:37 UTCEchelonGraph re-scored
  65. 2026-09-23 00:37 UTCGHSA enrichmentGHSA-j94p-2ppx-483m · GitHub CVSS 6.2
  66. 2026-09-22 16:01 UTCEPSS rescoreEPSS <0.1% · below the 1st percentile
  67. 2026-09-22 02:07 UTCGHSA enrichmentGHSA-j94p-2ppx-483m · GitHub CVSS 6.2
  68. 2026-09-21 03:35 UTCGHSA enrichmentGHSA-j94p-2ppx-483m · GitHub CVSS 6.2
  69. 2026-09-20 05:06 UTCEchelonGraph re-scored
  70. 2026-09-20 05:05 UTCGHSA enrichmentGHSA-j94p-2ppx-483m · GitHub CVSS 6.2
  71. 2026-09-19 06:36 UTCEchelonGraph re-scored
  72. 2026-09-19 06:36 UTCGHSA enrichmentGHSA-j94p-2ppx-483m · GitHub CVSS 6.2
  73. 2026-09-18 19:28 UTCEPSS rescoreEPSS <0.1% · below the 1st percentile
  74. 2026-09-18 08:04 UTCEchelonGraph re-scored
  75. 2026-09-18 08:04 UTCGHSA enrichmentGHSA-j94p-2ppx-483m · GitHub CVSS 6.2

Frequently asked(5)

What is CVE-2026-84970?
CVE-2026-84970 is a medium-severity vulnerability; its CVE record was published on September 3, 2026. A numeric truncation weakness exists in the JSON parsing component of the MongoDB C++ Driver's BSON library. An actor who controls the text that an embedding application hands to the library's public JSON parsing interface, when that text is very large, can cause the library to read memory beyond…
When was the CVE record for CVE-2026-84970 published?
The CVE record for CVE-2026-84970 was published on September 3, 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 September 10, 2026; the record at its source may have been updated since.
Is CVE-2026-84970 actively exploited?
CVE-2026-84970 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.1% probability of exploitation in the next 30 days (2nd percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-84970?
CVE-2026-84970 has a CVSS v3 base score of 5.8 (NVD). EchelonGraph synthesises NVD + FIRST EPSS + GHSA into a combined EG score of 6.2 (MEDIUM).
How do I remediate CVE-2026-84970?
A fix for CVE-2026-84970 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-84970 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

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