CVE-2026-55855

MEDIUMPre-NVD 6.56.5
EchelonGraph scoreMEDIUM confidence

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

This medium-severity CVE scores 6.5 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.7% (51st percentile of EPSS-scored CVEs). No GitHub Security Advisory CVSS is on record for this CVE.

Triggered by: Headline CVSS from a secondary CVSS source
Sources: EPSS, a secondary CVSS source
6.5EG
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: 0.7%CVSS: 6.5Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

MariaDB Connector/Node.js is used to connect applications developed on Node.js to MariaDB and MySQL databases. Prior to 3.2.4, 3.3.3, 3.4.6, and 3.5.3, MariaDB Connector/Node.js permits SQL injection when attacker-controlled Buffer parameters are escaped client-side under the big5, gbk, sjis, cp932, or gb18030 client character sets. PacketOutputStream.writeBufferEscape in lib/io/packet-output-stream.js escaped bytes without the charset-aware getMbRecognizer logic in lib/misc/charset-mb.js. The server SQL lexer runs my_ismbchar before escape processing, so an attacker-controlled lead byte can consume the inserted 0x5C backslash as a multibyte trail byte and leave the following 0x27 quote unescaped, terminating the string literal and allowing arbitrary SQL. The default utf8mb4 character set and parameters sent through the execute binary prepared-statement path are not affected. Successful exploitation can expose or modify data available to the database account. This issue is fixed in versions 3.2.4, 3.3.3, 3.4.6, and 3.5.3.

CVSS v3
6.5
EG Score
6.5MEDIUMmedium confidence
EG Risk
29
EG Risk 29/100

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 computed (value × EchelonGraph’s weight)
Severity65% × 45%
The EG Score, 6.5 of 10.
Exploitation0.5% × 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
0.7%
EPSS %ILE
51st
KEV
Not listed

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.

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

August 28, 2026

Last Modified

September 8, 2026

Advisory Details (10)

Auto-updated Aug 28, 2026
Patch available. Sources: github, github_commit, github_release.
Web page

[CONJS-350] Possible SQL injection in Buffer parameter escaping under big5/gbk/sjis/cp932/gb18030 client charsets - Jira

https://jira.mariadb.org/browse/CONJS-350
GitHub release Patch Available

MariaDB Connector/Node.js 3.5.3

Patch available: mariadb-corporation/mariadb-connector-nodejs 3.5.3

https://github.com/mariadb-corporation/mariadb-connector-nodejs/releases/tag/3.5.3
GitHub release Patch Available

MariaDB Connector/Node.js 3.4.6

Patch available: mariadb-corporation/mariadb-connector-nodejs 3.4.6

https://github.com/mariadb-corporation/mariadb-connector-nodejs/releases/tag/3.4.6
GitHub release Patch Available

MariaDB Connector/Node.js 3.3.3

Patch available: mariadb-corporation/mariadb-connector-nodejs 3.3.3

https://github.com/mariadb-corporation/mariadb-connector-nodejs/releases/tag/3.3.3
GitHub release Patch Available

MariaDB Connector/Node.js 3.2.4

Patch available: mariadb-corporation/mariadb-connector-nodejs 3.2.4

https://github.com/mariadb-corporation/mariadb-connector-nodejs/releases/tag/3.2.4
GitHub commit Patch Available

commit 97f183f33b5d (mariadb-corporation/mariadb-connector-nodejs)

Patch available: mariadb-corporation/mariadb-connector-nodejs 3.3.3 (contains commit 97f183f33b5d)

https://github.com/mariadb-corporation/mariadb-connector-nodejs/commit/97f183f33b5d4e6767b34ecabdd81fe3294a80a6
GitHub commit Patch Available

commit 7af8b7b8b7ae (mariadb-corporation/mariadb-connector-nodejs)

Patch available: mariadb-corporation/mariadb-connector-nodejs 3.5.3 (contains commit 7af8b7b8b7ae)

https://github.com/mariadb-corporation/mariadb-connector-nodejs/commit/7af8b7b8b7ae5e1a081693ade989f5a80c8e06e3
GitHub commit Patch Available

commit 26e35f9edb00 (mariadb-corporation/mariadb-connector-nodejs)

Patch available: mariadb-corporation/mariadb-connector-nodejs 3.4.6 (contains commit 26e35f9edb00)

https://github.com/mariadb-corporation/mariadb-connector-nodejs/commit/26e35f9edb00bcf249627a564e0052fba7b305a2
GitHub commit Patch Available

commit 25c6239b68fd (mariadb-corporation/mariadb-connector-nodejs)

Patch available: mariadb-corporation/mariadb-connector-nodejs 3.2.4 (contains commit 25c6239b68fd)

https://github.com/mariadb-corporation/mariadb-connector-nodejs/commit/25c6239b68fd909132355c3f8535a5ef32423468
GitHub advisoryMentions a patch (unverified)

Possible SQL injection in Buffer parameter escaping under big5/gbk/sjis/cp932/gb18030 client charsets · Advisory · mariadb-corporation/mariadb-connector-nodejs · GitHub

Affected: 3.2.4, 3.3.3, 3.4.6, and 3.5.3. Upgrade to the patched release on your branch:

https://github.com/mariadb-corporation/mariadb-connector-nodejs/security/advisories/GHSA-g5xc-5w98-jfvm

Vendor Advisories for CVE-2026-55855(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)
npm(1)
PackageVulnerable rangeFix by version rangeDependents
mariadb—
  • every version up to 3.2.4: fixed in 3.2.4
  • 3.3.0 up to 3.3.4: fixed in 3.3.4
  • 3.4.0 up to 3.4.6: fixed in 3.4.6
  • 3.5.0 up to 3.5.3: fixed in 3.5.3
—

Weakness Classification(2)

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

Data Freshness Timeline

(refreshed 14× in last 7d / 53× 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.

  1. 2026-10-13 16:34 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  2. 2026-10-12 16:34 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  3. 2026-10-12 15:55 UTCEG score recompute
  4. 2026-10-11 19:38 UTCEG score recompute
  5. 2026-10-11 16:53 UTCEG score recompute
  6. 2026-10-11 14:16 UTCEG score recompute
  7. 2026-10-11 13:49 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  8. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  9. 2026-10-10 05:15 UTCEG score recompute
  10. 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  11. 2026-10-09 02:58 UTCEG score recompute
  12. 2026-10-08 17:13 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  13. 2026-10-08 00:47 UTCEG score recompute
  14. 2026-10-07 23:48 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  15. 2026-10-06 20:27 UTCEG score recompute
  16. 2026-10-06 15:18 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  17. 2026-10-05 17:55 UTCEG score recompute
  18. 2026-10-05 17:43 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  19. 2026-10-04 23:22 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  20. 2026-10-04 15:46 UTCEG score recompute
  21. 2026-10-03 14:26 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  22. 2026-10-03 13:37 UTCEG score recompute
  23. 2026-10-02 17:56 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  24. 2026-10-02 08:06 UTCEG score recompute
  25. 2026-10-01 19:50 UTCEPSS rescoreEPSS 0.5% · 38th percentile
Show 56 more
  1. 2026-10-01 05:57 UTCEG score recompute
  2. 2026-09-30 15:03 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  3. 2026-09-30 03:49 UTCEG score recompute
  4. 2026-09-29 15:22 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  5. 2026-09-28 21:07 UTCEG score recompute
  6. 2026-09-28 13:51 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  7. 2026-09-27 17:42 UTCEG score recompute
  8. 2026-09-27 13:48 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  9. 2026-09-26 15:59 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  10. 2026-09-26 15:33 UTCEG score recompute
  11. 2026-09-25 07:19 UTCEG score recompute
  12. 2026-09-24 14:04 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  13. 2026-09-24 05:10 UTCEG score recompute
  14. 2026-09-23 17:54 UTCEPSS rescoreEPSS 0.3% · 24th percentile
  15. 2026-09-23 03:00 UTCEG score recompute
  16. 2026-09-22 00:50 UTCEG score recompute
  17. 2026-09-20 22:41 UTCEG score recompute
  18. 2026-09-20 20:16 UTCEPSS rescoreEPSS 0.3% · 24th percentile
  19. 2026-09-19 20:32 UTCEG score recompute
  20. 2026-09-18 19:28 UTCEPSS rescoreEPSS 0.3% · 24th percentile
  21. 2026-09-18 18:23 UTCEG score recompute
  22. 2026-09-17 19:31 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  23. 2026-09-17 16:14 UTCEG score recompute
  24. 2026-09-16 14:08 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  25. 2026-09-16 14:05 UTCEG score recompute
  26. 2026-09-16 05:15 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  27. 2026-09-15 11:04 UTCEG score recompute
  28. 2026-09-15 03:11 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  29. 2026-09-14 08:30 UTCEG score recompute
  30. 2026-09-13 16:47 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  31. 2026-09-13 06:20 UTCEG score recompute
  32. 2026-09-12 04:11 UTCEG score recompute
  33. 2026-09-11 14:53 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  34. 2026-09-11 02:01 UTCEG score recompute
  35. 2026-09-10 09:35 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  36. 2026-09-09 23:52 UTCEG score recompute
  37. 2026-09-08 22:01 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  38. 2026-09-07 04:59 UTCEG score recompute
  39. 2026-09-06 13:47 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  40. 2026-09-06 02:50 UTCEG score recompute
  41. 2026-09-05 00:41 UTCEG score recompute
  42. 2026-09-04 05:07 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  43. 2026-09-02 20:23 UTCEG score recompute
  44. 2026-09-02 14:12 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  45. 2026-09-01 17:39 UTCEG score recompute
  46. 2026-09-01 13:54 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  47. 2026-09-01 04:40 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  48. 2026-08-31 15:30 UTCEG score recompute
  49. 2026-08-31 14:27 UTCEG score recompute
  50. 2026-08-31 03:44 UTCEG score recompute
  51. 2026-08-30 19:17 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  52. 2026-08-30 01:34 UTCEG score recompute
  53. 2026-08-30 01:22 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  54. 2026-08-28 23:25 UTCEG score recompute
  55. 2026-08-28 22:22 UTCEG score recomputeFirst assessed: 6.5 MEDIUM
  56. 2026-08-28 22:18 UTCMITRE cvelistV5first tracked

Related CVEs(same product + same CWE)

Frequently asked(5)

What is CVE-2026-55855?
CVE-2026-55855 is a medium-severity vulnerability; its CVE record was published on August 28, 2026. MariaDB Connector/Node.js is used to connect applications developed on Node.js to MariaDB and MySQL databases. Prior to 3.2.4, 3.3.3, 3.4.6, and 3.5.3, MariaDB Connector/Node.js permits SQL injection when attacker-controlled Buffer parameters are escaped client-side under the big5, gbk, sjis,…
When was the CVE record for CVE-2026-55855 published?
The CVE record for CVE-2026-55855 was published on August 28, 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 8, 2026; the record at its source may have been updated since.
Is CVE-2026-55855 actively exploited?
CVE-2026-55855 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.7% probability of exploitation in the next 30 days (51st percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-55855?
CVE-2026-55855 has a CVSS base score of 6.5 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-55855?
A fix for CVE-2026-55855 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-55855 are linked in the Vendor Advisories panel on this page.

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