CVE-2026-107302

HIGHPre-NVD 7.57.5
EchelonGraph scoreMEDIUM confidence

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

Score 7.5 from GitHub Security Advisory (severity: HIGH) published 2026-10-08. A secondary CVSS source baseline 7.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: EPSS, GitHub Security Advisory, a secondary CVSS source

Also known asEUVD-2026-95114 (ENISA EUVD) · GHSA-8f34-f56x-9xph (GitHub Security Advisories)Source: ENISA EUVD

7.5EG
EchelonGraph verdictPlan a fixRemediate within your standard update timelines at low or medium mission impact and sooner than that at high (the SSVC decision on this page).
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.5%CVSS: 7.5Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

msgpack5 is a msgpack v5 implementation for node.js and the browser. Prior to 6.1.0, the decoder reads the four-byte length of a map32 value before validating that the complete five-byte header is available. A truncated map32 header therefore causes a checked out-of-bounds buffer read and throws RangeError instead of IncompleteBufferError, which can unexpectedly terminate a request, stream, or worker in applications that wait for additional bytes after IncompleteBufferError. There is no adjacent-memory disclosure because the buffer implementation checks bounds. This issue is fixed in version 6.1.0.

CVSS v3
7.5
EG Score
7.5HIGHmedium confidence
EG Risk
49
EG Risk 49/100

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)
Severity75% × 45%
Impact severity (EG Severity): CVSS 7.5 of 10. Never the KEV-floored or EPSS-lifted EG Score.
Exploitation0.5% × 40%
FIRST EPSS: the 30-day exploitation probability when EchelonGraph scored this CVE.
Automatability100% × 15%
CISA's SSVC Automatable value: yes (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at low or medium mission impact; Attend at high (mission-essential systems).
Exploitation none (CISA Vulnrichment) · Automatable yes (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 at low or medium mission impact and sooner than that at high.
EPSS PROB
0.5%
EPSS %ILE
44th
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 (7.5): severity, escalated by confirmed exploitation. This CVE's 7.5 is its impact severity (EG Severity), not escalated.

EG Severity
7.5 HIGHCVSS-B, impact only: no KEV listing, EPSS or EG-KEV tier raises it.GitHub Security Advisory CVSS
EG Likelihood
0.5% 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 low or medium mission impact; Attend at high (mission-essential systems).CISA BOD 26-04: 14 days if the affected system is publicly exposed; 60 days 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 low or medium mission impact; Attend at high (mission-essential systems).

A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.

Exploitation none (CISA Vulnrichment) · Automatable yes (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)14 days if the affected system is publicly exposed; 60 days if it is not.

The score's inputs: In CISA KEV no (CISA's KEV catalog) · Automatable yes (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

October 8, 2026

Last Modified

October 19, 2026

Advisory Details (3)

Auto-updated Oct 8, 2026
Patch available. Sources: github, github_commit, github_release.
GitHub release Patch Available

v6.1.0

Patch available: mcollina/msgpack5 v6.1.0

https://github.com/mcollina/msgpack5/releases/tag/v6.1.0
GitHub commit Patch Available

commit 15443a1f2aa6 (mcollina/msgpack5)

Patch available: mcollina/msgpack5 v6.1.0 (contains commit 15443a1f2aa6)

https://github.com/mcollina/msgpack5/commit/15443a1f2aa682a6aa37f1705ac628de5b866ad1
GitHub advisoryMentions a patch (unverified)

Truncated map32 headers throw an unexpected error · Advisory · mcollina/msgpack5 · GitHub

https://github.com/mcollina/msgpack5/security/advisories/GHSA-8f34-f56x-9xph

Vendor Advisories for CVE-2026-107302(2)

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

Patch Availability(1)

Vendor / EcosystemFix (by version range) / PatchReleasedSource
npmmsgpack5 @ 6.1.0 (fixes >= 4.1.0, < 6.1.0)—ghsa

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Affected Packages

(1 across 1 ecosystem)
npm(1)
PackageVulnerable rangeFix by version rangeDependents
msgpack5—
  • 4.1.0 up to 6.1.0: fixed in 6.1.0
—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 9× in last 7d / 39× 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. 2026-11-12 16:32 UTCEPSS rescoreEPSS 0.5% · 44th percentile
  2. 2026-11-11 16:37 UTCEPSS rescoreEPSS 0.5% · 44th percentile
  3. 2026-11-10 16:41 UTCEPSS rescoreEPSS 0.5% · 44th percentile
  4. 2026-11-09 16:34 UTCEPSS rescoreEPSS 0.5% · 44th percentile
  5. 2026-11-08 16:38 UTCEPSS rescoreEPSS 0.5% · 44th percentile
  6. 2026-11-07 17:41 UTCEchelonGraph re-scored
  7. 2026-11-07 17:41 UTCVendor advisory
  8. 2026-11-07 17:41 UTCGHSA enrichmentGHSA-8f34-f56x-9xph · GitHub severity HIGH · GitHub CVSS 7.5
  9. 2026-11-07 16:38 UTCEPSS rescoreEPSS 0.5% · 44th percentile
  10. 2026-11-06 16:35 UTCEPSS rescoreEPSS 0.5% · 44th percentile
  11. 2026-11-05 16:36 UTCEPSS rescoreEPSS 0.5% · 44th percentile
  12. 2026-11-04 16:34 UTCEPSS rescoreEPSS 0.5% · 44th percentile
  13. 2026-11-03 16:46 UTCEPSS rescoreEPSS 0.5% · 44th percentile
  14. 2026-11-03 16:02 UTCEchelonGraph re-scored
  15. 2026-11-03 16:02 UTCVendor advisory
  16. 2026-11-03 16:02 UTCGHSA enrichmentGHSA-8f34-f56x-9xph · GitHub severity HIGH · GitHub CVSS 7.5
  17. 2026-11-02 16:43 UTCEPSS rescoreEPSS 0.5% · 44th percentile
  18. 2026-11-01 16:33 UTCEPSS rescoreEPSS 0.5% · 44th percentile
  19. 2026-11-01 08:00 UTCGHSA enrichmentGHSA-8f34-f56x-9xph · GitHub severity HIGH · GitHub CVSS 7.5
  20. 2026-11-01 08:00 UTCEchelonGraph re-scored
  21. 2026-10-31 16:31 UTCEPSS rescoreEPSS 0.5% · 44th percentile
  22. 2026-10-30 16:33 UTCEPSS rescoreEPSS 0.5% · 44th percentile
  23. 2026-10-29 16:32 UTCEPSS rescoreEPSS 0.5% · 44th percentile
  24. 2026-10-28 16:31 UTCEPSS rescoreEPSS 0.5% · 44th percentile
  25. 2026-10-27 18:33 UTCEchelonGraph re-scored
Show 41 more
  1. 2026-10-27 18:33 UTCVendor advisory
  2. 2026-10-27 16:31 UTCEPSS rescoreEPSS 0.5% · 44th percentile
  3. 2026-10-26 16:30 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  4. 2026-10-25 16:32 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  5. 2026-10-25 14:54 UTCEchelonGraph re-scored
  6. 2026-10-24 16:32 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  7. 2026-10-23 16:31 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  8. 2026-10-22 16:33 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  9. 2026-10-21 16:32 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  10. 2026-10-20 16:32 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  11. 2026-10-19 20:38 UTCEchelonGraph re-scored
  12. 2026-10-19 20:38 UTCVendor advisory
  13. 2026-10-19 19:49 UTCEchelonGraph re-scored
  14. 2026-10-19 19:49 UTCVendor advisory
  15. 2026-10-19 16:31 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  16. 2026-10-18 16:31 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  17. 2026-10-18 05:07 UTCEchelonGraph re-scored
  18. 2026-10-17 19:21 UTCEchelonGraph re-scored
  19. 2026-10-17 19:21 UTCVendor advisory
  20. 2026-10-17 16:33 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  21. 2026-10-16 16:40 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  22. 2026-10-15 16:31 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  23. 2026-10-14 16:32 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  24. 2026-10-13 16:33 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  25. 2026-10-12 16:38 UTCEchelonGraph re-scored
  26. 2026-10-12 16:33 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  27. 2026-10-12 01:14 UTCVendor advisory
  28. 2026-10-11 20:14 UTCEchelonGraph re-scored
  29. 2026-10-11 18:26 UTCEchelonGraph re-scored
  30. 2026-10-11 15:00 UTCEchelonGraph re-scored
  31. 2026-10-11 13:47 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  32. 2026-10-11 12:31 UTCEchelonGraph re-scored
  33. 2026-10-11 12:31 UTCVendor advisory
  34. 2026-10-10 23:43 UTCEchelonGraph re-scored
  35. 2026-10-10 19:59 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  36. 2026-10-09 22:20 UTCEchelonGraph re-scored
  37. 2026-10-09 20:06 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  38. 2026-10-08 18:36 UTCEchelonGraph re-scored
  39. 2026-10-08 17:50 UTCEchelonGraph re-scored
  40. 2026-10-08 17:30 UTCEchelonGraph re-scoredFirst assessed: 7.5 HIGH
  41. 2026-10-08 17:29 UTCMITRE cvelistV5first tracked

Frequently asked(5)

What is CVE-2026-107302?
CVE-2026-107302 is a high-severity vulnerability; its CVE record was published on October 8, 2026. msgpack5 is a msgpack v5 implementation for node.js and the browser. Prior to 6.1.0, the decoder reads the four-byte length of a map32 value before validating that the complete five-byte header is available. A truncated map32 header therefore causes a checked out-of-bounds buffer read and throws…
When was the CVE record for CVE-2026-107302 published?
The CVE record for CVE-2026-107302 was published on October 8, 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 October 19, 2026; the record at its source may have been updated since.
Is CVE-2026-107302 actively exploited?
CVE-2026-107302 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.5% probability of exploitation in the next 30 days (44th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-107302?
CVE-2026-107302 has a CVSS base score of 7.5 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-107302?
A fix for CVE-2026-107302 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-107302 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

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