CVE-2026-88035

MEDIUMNVD 5.55.5
EchelonGraph scoreMEDIUM confidence

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

This medium-severity CVE scores 5.5 under NVD CVSS v3. EPSS exploit probability: 0.1% (below the 1st percentile of EPSS-scored CVEs). GitHub Security Advisory CVSS 4.7 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 2026-09-10) is not newer than that change (2026-09-16), so it does not.

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

Also known asEUVD-2026-75671 (ENISA EUVD) · GHSA-jgj9-g5rr-w8xg (GitHub Security Advisories)Source: ENISA EUVD

5.5EG
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: 5.5Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

A size check in the client-side authentication path of the MongoDB C Driver can wrap around, so an unusually large user-name value is accepted and copied past the end of a small buffer. A party able to set the driver's connection settings may cause the application that embeds the driver to terminate unexpectedly. Reaching this code requires a build in which the optional external SASL authentication backend is present and a connection configured to use it.

CVSS v3
5.5
EG Score
5.5MEDIUMmedium confidence
EG Risk
25
EG Risk 25/100

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)
Severity55% × 45%
Impact severity (EG Severity): CVSS 5.5 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
below the 1st
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 (5.5): severity, escalated by confirmed exploitation. This CVE's 5.5 is its impact severity (EG Severity), not escalated.

EG Severity
5.5 MEDIUMCVSS-B, impact only: no KEV listing, EPSS or EG-KEV tier raises it.NVD CVSS v3 · CVSS v3.0 or v3.1
EG Likelihood
0.1% within 30 daysSource: FIRST EPSS (model v2026.06.15, score date 2026-10-24). 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 10, 2026

Last Modified

September 16, 2026

Advisory Details (1)

Auto-updated Sep 10, 2026
Patch available.
Web page

Loading...

https://jira.mongodb.org/browse/CDRIVER-6416

Vendor Advisories for CVE-2026-88035(1)

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

Affected Packages

(3 across 3 ecosystems)
Debian:12(1)
PackageVulnerable rangeFix by version rangeDependents
mongo-c-driver1.23.1-1 ... 2.5.5-1 (54 versions)
  • every version on: no fix on record
—
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
mongo-c-driver1.30.4-1 ... 2.5.5-1 (23 versions)
  • every version on: no fix on record
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
mongo-c-driver1.30.4-1 ... 2.5.2-1 (18 versions)
  • every version up to 2.5.3-1: fixed in 2.5.3-1
—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 7× in last 7d / 49× 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 it from the CNA feed. 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). Most recent first.

Showing the most recent 100 of 109 refreshes 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 9 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-11-01 16:35 UTCEPSS rescoreEPSS 0.1% · below the 1st percentile
  2. 2026-10-31 16:33 UTCEPSS rescoreEPSS 0.1% · below the 1st percentile
  3. 2026-10-30 16:35 UTCEPSS rescoreEPSS 0.1% · below the 1st percentile
  4. 2026-10-29 22:55 UTCOSV refresh
  5. 2026-10-29 16:34 UTCEPSS rescoreEPSS 0.1% · below the 1st percentile
  6. 2026-10-27 16:32 UTCEPSS rescoreEPSS 0.1% · below the 1st percentile
  7. 2026-10-26 16:32 UTCEPSS rescoreEPSS 0.1% · below the 1st percentile
  8. 2026-10-25 16:34 UTCEPSS rescoreEPSS 0.1% · below the 1st percentile
  9. 2026-10-25 13:53 UTCEG score recompute
  10. 2026-10-24 16:34 UTCEPSS rescoreEPSS 0.1% · below the 1st percentile
  11. 2026-10-22 16:35 UTCEPSS rescoreEPSS 0.1% · below the 1st percentile
  12. 2026-10-22 12:33 UTCEG score recompute
  13. 2026-10-22 12:33 UTCGHSA enrichmentGHSA-jgj9-g5rr-w8xg · GitHub CVSS 4.7
  14. 2026-10-21 16:34 UTCEPSS rescoreEPSS 0.1% · below the 1st percentile
  15. 2026-10-20 16:33 UTCEPSS rescoreEPSS 0.1% · below the 1st percentile
  16. 2026-10-19 16:33 UTCEPSS rescoreEPSS 0.1% · below the 1st percentile
  17. 2026-10-18 16:33 UTCEPSS rescoreEPSS 0.1% · below the 1st percentile
  18. 2026-10-18 03:03 UTCEG score recompute
  19. 2026-10-17 16:35 UTCEPSS rescoreEPSS 0.1% · below the 1st percentile
  20. 2026-10-16 16:44 UTCEPSS rescoreEPSS 0.1% · below the 1st percentile
  21. 2026-10-15 16:33 UTCEPSS rescoreEPSS 0.1% · below the 1st percentile
  22. 2026-10-14 16:34 UTCEPSS rescoreEPSS 0.1% · below the 1st percentile
  23. 2026-10-13 16:35 UTCEPSS rescoreEPSS 0.1% · below the 1st percentile
  24. 2026-10-12 16:35 UTCEPSS rescoreEPSS 0.1% · below the 1st percentile
  25. 2026-10-12 14:49 UTCEG score recompute
Show 75 more
  1. 2026-10-11 19:15 UTCEG score recompute
  2. 2026-10-11 16:32 UTCEG score recompute
  3. 2026-10-11 13:49 UTCEPSS rescoreEPSS 0.1% · below the 1st percentile
  4. 2026-10-11 13:49 UTCEG score recompute
  5. 2026-10-11 07:02 UTCEG score recompute
  6. 2026-10-11 07:02 UTCGHSA enrichmentGHSA-jgj9-g5rr-w8xg · GitHub CVSS 4.7
  7. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.1% · below the 1st percentile
  8. 2026-10-10 01:10 UTCEG score recompute
  9. 2026-10-10 01:09 UTCGHSA enrichmentGHSA-jgj9-g5rr-w8xg · GitHub CVSS 4.7
  10. 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.1% · below the 1st percentile
  11. 2026-10-08 23:49 UTCEG score recompute
  12. 2026-10-08 23:49 UTCGHSA enrichmentGHSA-jgj9-g5rr-w8xg · GitHub CVSS 4.7
  13. 2026-10-08 17:13 UTCEPSS rescoreEPSS 0.1% · below the 1st percentile
  14. 2026-10-07 23:48 UTCEPSS rescoreEPSS 0.1% · below the 1st percentile
  15. 2026-10-07 22:29 UTCGHSA enrichmentGHSA-jgj9-g5rr-w8xg · GitHub CVSS 4.7
  16. 2026-10-06 20:20 UTCEG score recompute
  17. 2026-10-06 20:19 UTCGHSA enrichmentGHSA-jgj9-g5rr-w8xg · GitHub CVSS 4.7
  18. 2026-10-06 15:18 UTCEPSS rescoreEPSS 0.1% · below the 1st percentile
  19. 2026-10-05 18:52 UTCEG score recompute
  20. 2026-10-05 18:52 UTCGHSA enrichmentGHSA-jgj9-g5rr-w8xg · GitHub CVSS 4.7
  21. 2026-10-05 17:44 UTCEPSS rescoreEPSS 0.1% · below the 1st percentile
  22. 2026-10-04 17:32 UTCGHSA enrichmentGHSA-jgj9-g5rr-w8xg · GitHub CVSS 4.7
  23. 2026-10-03 16:13 UTCEG score recompute
  24. 2026-10-03 16:12 UTCGHSA enrichmentGHSA-jgj9-g5rr-w8xg · GitHub CVSS 4.7
  25. 2026-10-02 14:53 UTCEG score recompute
  26. 2026-10-02 14:53 UTCGHSA enrichmentGHSA-jgj9-g5rr-w8xg · GitHub CVSS 4.7
  27. 2026-10-01 19:51 UTCEPSS rescoreEPSS 0.1% · below the 1st percentile
  28. 2026-10-01 13:32 UTCEG score recompute
  29. 2026-10-01 13:32 UTCGHSA enrichmentGHSA-jgj9-g5rr-w8xg · GitHub CVSS 4.7
  30. 2026-09-30 15:04 UTCEPSS rescoreEPSS 0.1% · below the 1st percentile
  31. 2026-09-30 12:12 UTCEG score recompute
  32. 2026-09-30 12:12 UTCGHSA enrichmentGHSA-jgj9-g5rr-w8xg · GitHub CVSS 4.7
  33. 2026-09-29 10:53 UTCEG score recompute
  34. 2026-09-29 10:53 UTCGHSA enrichmentGHSA-jgj9-g5rr-w8xg · GitHub CVSS 4.7
  35. 2026-09-28 13:52 UTCEPSS rescoreEPSS 0.1% · below the 1st percentile
  36. 2026-09-28 09:15 UTCEG score recompute
  37. 2026-09-28 09:15 UTCGHSA enrichmentGHSA-jgj9-g5rr-w8xg · GitHub CVSS 4.7
  38. 2026-09-27 13:48 UTCEPSS rescoreEPSS 0.1% · below the 1st percentile
  39. 2026-09-27 07:56 UTCEG score recompute
  40. 2026-09-27 07:56 UTCGHSA enrichmentGHSA-jgj9-g5rr-w8xg · GitHub CVSS 4.7
  41. 2026-09-26 15:59 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  42. 2026-09-26 06:36 UTCEG score recompute
  43. 2026-09-26 06:36 UTCGHSA enrichmentGHSA-jgj9-g5rr-w8xg · GitHub CVSS 4.7
  44. 2026-09-25 05:16 UTCEG score recompute
  45. 2026-09-25 05:16 UTCGHSA enrichmentGHSA-jgj9-g5rr-w8xg · GitHub CVSS 4.7
  46. 2026-09-24 14:04 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  47. 2026-09-24 03:57 UTCGHSA enrichmentGHSA-jgj9-g5rr-w8xg · GitHub CVSS 4.7
  48. 2026-09-23 02:37 UTCEG score recompute
  49. 2026-09-23 02:37 UTCGHSA enrichmentGHSA-jgj9-g5rr-w8xg · GitHub CVSS 4.7
  50. 2026-09-22 16:01 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  51. 2026-09-22 01:17 UTCEG score recompute
  52. 2026-09-22 01:17 UTCGHSA enrichmentGHSA-jgj9-g5rr-w8xg · GitHub CVSS 4.7
  53. 2026-09-21 21:09 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  54. 2026-09-20 23:58 UTCGHSA enrichmentGHSA-jgj9-g5rr-w8xg · GitHub CVSS 4.7
  55. 2026-09-19 22:38 UTCEG score recompute
  56. 2026-09-19 22:38 UTCGHSA enrichmentGHSA-jgj9-g5rr-w8xg · GitHub CVSS 4.7
  57. 2026-09-18 21:19 UTCEG score recompute
  58. 2026-09-18 21:19 UTCGHSA enrichmentGHSA-jgj9-g5rr-w8xg · GitHub CVSS 4.7
  59. 2026-09-18 19:28 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  60. 2026-09-17 19:46 UTCEG score recompute
  61. 2026-09-17 19:46 UTCGHSA enrichmentGHSA-jgj9-g5rr-w8xg · GitHub CVSS 4.7
  62. 2026-09-17 19:32 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  63. 2026-09-16 18:10 UTCEG score recompute▲ 0.80
  64. 2026-09-16 18:10 UTCGHSA enrichmentGHSA-jgj9-g5rr-w8xg · GitHub CVSS 4.7
  65. 2026-09-16 18:09 UTCNVD updateCVSS v3 → 5.5
  66. 2026-09-16 14:09 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  67. 2026-09-16 05:15 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  68. 2026-09-16 02:37 UTCEG score recompute
  69. 2026-09-16 02:37 UTCGHSA enrichmentGHSA-jgj9-g5rr-w8xg · GitHub CVSS 4.7
  70. 2026-09-15 03:12 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  71. 2026-09-15 01:17 UTCGHSA enrichmentGHSA-jgj9-g5rr-w8xg · GitHub CVSS 4.7
  72. 2026-09-13 23:57 UTCEG score recompute
  73. 2026-09-13 23:57 UTCGHSA enrichmentGHSA-jgj9-g5rr-w8xg · GitHub CVSS 4.7
  74. 2026-09-13 16:48 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  75. 2026-09-12 22:38 UTCEG score recompute

Related CVEs(same product + same CWE)

Frequently asked(5)

What is CVE-2026-88035?
CVE-2026-88035 is a medium-severity vulnerability; its CVE record was published on September 10, 2026. A size check in the client-side authentication path of the MongoDB C Driver can wrap around, so an unusually large user-name value is accepted and copied past the end of a small buffer. A party able to set the driver's connection settings may cause the application that embeds the driver to…
When was the CVE record for CVE-2026-88035 published?
The CVE record for CVE-2026-88035 was published on September 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 September 16, 2026; the record at its source may have been updated since.
Is CVE-2026-88035 actively exploited?
CVE-2026-88035 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.1% probability of exploitation in the next 30 days (below the 1st percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-88035?
CVE-2026-88035 has a CVSS v3 base score of 5.5 (NVD).
How do I remediate CVE-2026-88035?
A fix for CVE-2026-88035 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-88035 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

See which npm, PyPI, Go, and Maven packages are affected by CVE-2026-88035

Explore →

Is Your Infrastructure Affected by CVE-2026-88035?

EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.

Book a Demo →Browse All CVEs