CVE-2026-46671

MEDIUMPre-NVD 4.44.4
EchelonGraph scoreMEDIUM confidence

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

Score 4.4 from GitHub Security Advisory (severity: MODERATE) published 2026-05-21. A secondary CVSS source baseline 4.4; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: EPSS, GitHub Security Advisory, a secondary CVSS source
Trending — 3 sources updated this week

Also known asEUVD-2026-45987 (ENISA EUVD) · GHSA-4j5m-wc25-pvh7 (GitHub Security Advisories)Source: ENISA EUVD

4.4EG
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: 0.2%CVSS: 4.4Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

Rust OneNote File Parser is a parser for Microsoft OneNote files implemented in Rust. Prior to version 1.1.1, a maliciously crafted .onetoc2 table-of-contents file can cause Parser::parse_notebook to open arbitrary files on the host filesystem outside the notebook's directory. The parser reads entry names listed inside the .onetoc2 and joins them against the notebook's base directory without validating that they are relative paths confined to that directory. The parser will bail out when the target file fails to parse as a OneNote section, so direct content exfiltration through the parser's return value is not practical, though file-existence probing and denial-of-service via large or special files remain possible. Anyone using onenote_parser to parse .onetoc2 files received from untrusted sources is affected. Users who only ever parse their own notebooks are not at meaningful risk. The issue is fixed in onenote_parser 1.1.1. The fix rejects absolute paths, parent-directory components, and other invalid path characters in entry names, and additionally canonicalises the resolved path to confirm it stays inside the notebook's base directory. For users who cannot upgrade to 1.1.1, only call Parser::parse_notebook on .onetoc2 files from trusted sources. Alternatively, use Parser::parse_section / Parser::parse_section_buffer on individual .one files, which do not perform the directory walk.

CVSS v3
4.4
EG Score
4.4MEDIUMmedium confidence
EG Risk
20
EG Risk 20/100

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)
Severity44% × 45%
Impact severity (EG Severity): CVSS 4.4 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
0.2%
EPSS %ILE
4th
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 (4.4): severity, escalated by confirmed exploitation. This CVE's 4.4 is its impact severity (EG Severity), not escalated.

EG Severity
4.4 MEDIUMCVSS-B, impact only: no KEV listing, EPSS or EG-KEV tier raises it.GitHub Security Advisory CVSS
EG Likelihood
0.2% within 30 daysSource: FIRST EPSS (model v2026.06.15, score date 2026-10-31). 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

May 21, 2026

Last Modified

October 24, 2026

Advisory Details (4)

Auto-updated Jul 26, 2026
Patch available. Sources: github_commit, github_release, github.
GitHub advisoryMentions a patch (unverified)

Path traversal in `Parser::parse_notebook` allows reading files outside the notebook directory · Advisory · msiemens/onenote.rs · GitHub

https://github.com/msiemens/onenote.rs/security/advisories/GHSA-4j5m-wc25-pvh7
GitHub release Patch Available

v1.1.1

Patch available: msiemens/onenote.rs v1.1.1

https://github.com/msiemens/onenote.rs/releases/tag/v1.1.1
GitHub commit Patch Available

commit c9267b2c96e2 (msiemens/onenote.rs)

Patch available: msiemens/onenote.rs v1.1.1 (contains commit c9267b2c96e2)

https://github.com/msiemens/onenote.rs/commit/c9267b2c96e2542be7e7b557d67318e81b733585
Web page

onenote.rs/CHANGELOG.md at master · msiemens/onenote.rs · GitHub

https://github.com/msiemens/onenote.rs/blob/master/CHANGELOG.md#111---2026-05-15

Vendor Advisories for CVE-2026-46671(1)

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
rustonenote_parser @ 1.1.1 (fixes < 1.1.1)—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)
crates.io(1)
PackageVulnerable rangeFix by version rangeDependents
onenote_parser—
  • every version up to 1.1.1: fixed in 1.1.1
—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 8× in last 7d / 38× 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 124 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 24 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-11-02 16:45 UTCEPSS rescoreEPSS 0.2% · 4th percentile
  2. 2026-11-01 16:34 UTCEPSS rescoreEPSS 0.2% · 4th percentile
  3. 2026-11-01 07:48 UTCGHSA enrichmentGHSA-4j5m-wc25-pvh7 · GitHub severity MODERATE · GitHub CVSS 4.4
  4. 2026-11-01 07:48 UTCEG score recompute
  5. 2026-10-31 16:32 UTCEPSS rescoreEPSS 0.2% · 4th percentile
  6. 2026-10-30 16:34 UTCEPSS rescoreEPSS 0.2% · 4th percentile
  7. 2026-10-29 16:33 UTCEPSS rescoreEPSS 0.2% · 4th percentile
  8. 2026-10-28 16:32 UTCEPSS rescoreEPSS 0.2% · 4th percentile
  9. 2026-10-26 16:31 UTCEPSS rescoreEPSS 0.2% · 4th percentile
  10. 2026-10-25 16:33 UTCEPSS rescoreEPSS 0.2% · 4th percentile
  11. 2026-10-25 14:25 UTCEG score recompute
  12. 2026-10-24 20:28 UTCEG score recompute
  13. 2026-10-24 16:33 UTCEPSS rescoreEPSS 0.2% · 4th percentile
  14. 2026-10-23 16:31 UTCEPSS rescoreEPSS 0.2% · 4th percentile
  15. 2026-10-22 23:22 UTCEG score recompute
  16. 2026-10-22 16:34 UTCEPSS rescoreEPSS 0.2% · 4th percentile
  17. 2026-10-21 16:33 UTCEPSS rescoreEPSS 0.2% · 4th percentile
  18. 2026-10-20 16:33 UTCEPSS rescoreEPSS 0.2% · 8th percentile
  19. 2026-10-19 16:32 UTCEPSS rescoreEPSS 0.2% · 8th percentile
  20. 2026-10-18 16:32 UTCEPSS rescoreEPSS 0.2% · 8th percentile
  21. 2026-10-18 03:36 UTCEG score recompute
  22. 2026-10-17 16:34 UTCEPSS rescoreEPSS 0.2% · 8th percentile
  23. 2026-10-16 16:42 UTCEPSS rescoreEPSS 0.2% · 8th percentile
  24. 2026-10-15 16:32 UTCEPSS rescoreEPSS 0.2% · 8th percentile
  25. 2026-10-14 16:33 UTCEPSS rescoreEPSS 0.2% · 8th percentile
Show 75 more
  1. 2026-10-13 16:34 UTCEPSS rescoreEPSS 0.2% · 8th percentile
  2. 2026-10-12 16:34 UTCEPSS rescoreEPSS 0.2% · 8th percentile
  3. 2026-10-12 16:02 UTCEG score recompute
  4. 2026-10-11 19:45 UTCEG score recompute
  5. 2026-10-11 16:59 UTCEG score recompute
  6. 2026-10-11 14:24 UTCEG score recompute
  7. 2026-10-11 13:48 UTCEPSS rescoreEPSS 0.2% · 8th percentile
  8. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.2% · 8th percentile
  9. 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.2% · 8th percentile
  10. 2026-10-07 23:48 UTCEPSS rescoreEPSS 0.2% · 8th percentile
  11. 2026-10-06 15:18 UTCEPSS rescoreEPSS 0.2% · 8th percentile
  12. 2026-10-05 17:43 UTCEPSS rescoreEPSS 0.2% · 7th percentile
  13. 2026-10-04 23:22 UTCEPSS rescoreEPSS 0.2% · 7th percentile
  14. 2026-10-03 14:25 UTCEPSS rescoreEPSS 0.2% · 7th percentile
  15. 2026-10-01 19:50 UTCEPSS rescoreEPSS 0.2% · 7th percentile
  16. 2026-09-30 15:03 UTCEPSS rescoreEPSS 0.2% · 7th percentile
  17. 2026-09-30 02:40 UTCOSV refresh
  18. 2026-09-28 13:51 UTCEPSS rescoreEPSS 0.2% · 7th percentile
  19. 2026-09-27 13:48 UTCEPSS rescoreEPSS 0.2% · 7th percentile
  20. 2026-09-26 15:59 UTCEPSS rescoreEPSS 0.2% · 7th percentile
  21. 2026-09-26 00:27 UTCEPSS rescoreEPSS 0.2% · 7th percentile
  22. 2026-09-23 17:53 UTCEPSS rescoreEPSS 0.2% · 4th percentile
  23. 2026-09-20 20:16 UTCEPSS rescoreEPSS 0.2% · 4th percentile
  24. 2026-09-18 19:28 UTCEPSS rescoreEPSS 0.2% · 4th percentile
  25. 2026-09-17 19:31 UTCEPSS rescoreEPSS 0.2% · 9th percentile
  26. 2026-09-16 14:08 UTCEPSS rescoreEPSS 0.2% · 9th percentile
  27. 2026-09-16 05:15 UTCEPSS rescoreEPSS 0.2% · 8th percentile
  28. 2026-09-13 16:47 UTCEPSS rescoreEPSS 0.2% · 8th percentile
  29. 2026-09-12 15:01 UTCEPSS rescoreEPSS 0.2% · 8th percentile
  30. 2026-09-11 14:53 UTCEPSS rescoreEPSS 0.2% · 8th percentile
  31. 2026-09-11 09:37 UTCEPSS rescoreEPSS 0.2% · 8th percentile
  32. 2026-09-11 04:23 UTCOSV refresh
  33. 2026-09-10 09:34 UTCEPSS rescoreEPSS 0.2% · 8th percentile
  34. 2026-09-08 22:00 UTCEPSS rescoreEPSS 0.2% · 8th percentile
  35. 2026-09-07 16:01 UTCEPSS rescoreEPSS 0.2% · 8th percentile
  36. 2026-09-06 13:47 UTCEPSS rescoreEPSS 0.2% · 8th percentile
  37. 2026-09-04 05:06 UTCEPSS rescoreEPSS 0.2% · 8th percentile
  38. 2026-09-02 14:12 UTCEPSS rescoreEPSS 0.2% · 8th percentile
  39. 2026-09-01 13:54 UTCEPSS rescoreEPSS 0.2% · 8th percentile
  40. 2026-08-30 19:17 UTCEPSS rescoreEPSS 0.2% · 8th percentile
  41. 2026-08-30 01:22 UTCEPSS rescoreEPSS 0.2% · 8th percentile
  42. 2026-08-28 21:41 UTCEPSS rescoreEPSS 0.2% · 8th percentile
  43. 2026-08-27 14:25 UTCEPSS rescoreEPSS 0.2% · 8th percentile
  44. 2026-08-26 14:46 UTCEPSS rescoreEPSS 0.2% · 8th percentile
  45. 2026-08-25 13:49 UTCEPSS rescoreEPSS 0.2% · 8th percentile
  46. 2026-08-23 16:45 UTCEG score recompute
  47. 2026-08-21 23:49 UTCEPSS rescoreEPSS 0.2% · 5th percentile
  48. 2026-08-21 21:44 UTCEG score recompute
  49. 2026-08-20 22:55 UTCEPSS rescoreEPSS 0.2% · 5th percentile
  50. 2026-08-20 18:42 UTCEG score recompute
  51. 2026-08-19 17:04 UTCEPSS rescoreEPSS 0.2% · 5th percentile
  52. 2026-08-18 18:25 UTCEG score recompute
  53. 2026-08-18 13:48 UTCEPSS rescoreEPSS 0.1% · 4th percentile
  54. 2026-08-17 13:47 UTCEPSS rescoreEPSS 0.1% · 4th percentile
  55. 2026-08-17 09:46 UTCEG score recompute
  56. 2026-08-16 14:56 UTCEPSS rescoreEPSS 0.1% · 4th percentile
  57. 2026-08-16 03:22 UTCEG score recompute
  58. 2026-08-16 02:14 UTCEPSS rescoreEPSS 0.1% · 4th percentile
  59. 2026-08-15 01:30 UTCEPSS rescoreEPSS 0.1% · 4th percentile
  60. 2026-08-14 12:56 UTCEG score recompute
  61. 2026-08-13 22:00 UTCEPSS rescoreEPSS 0.1% · 4th percentile
  62. 2026-08-13 11:23 UTCEG score recompute
  63. 2026-08-12 13:51 UTCEPSS rescoreEPSS 0.1% · 4th percentile
  64. 2026-08-12 09:50 UTCEG score recompute
  65. 2026-08-11 07:05 UTCEG score recompute
  66. 2026-08-11 00:00 UTCEPSS rescoreEPSS 0.1% · 4th percentile
  67. 2026-08-10 05:30 UTCEG score recompute
  68. 2026-08-09 13:46 UTCEPSS rescoreEPSS 0.1% · 4th percentile
  69. 2026-08-09 03:58 UTCEG score recompute
  70. 2026-08-08 16:37 UTCEPSS rescoreEPSS 0.1% · 4th percentile
  71. 2026-08-08 02:25 UTCEG score recompute
  72. 2026-08-07 00:53 UTCEG score recompute
  73. 2026-08-06 13:47 UTCEPSS rescoreEPSS 0.1% · 4th percentile
  74. 2026-08-05 21:12 UTCEG score recompute
  75. 2026-08-05 19:17 UTCEPSS rescoreEPSS 0.1% · 4th percentile

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-46671?
CVE-2026-46671 is a medium-severity vulnerability; its CVE record was published on May 21, 2026. Rust OneNote File Parser is a parser for Microsoft OneNote files implemented in Rust. Prior to version 1.1.1, a maliciously crafted .onetoc2 table-of-contents file can cause Parser::parse_notebook to open arbitrary files on the host filesystem outside the notebook's directory. The parser reads…
When was the CVE record for CVE-2026-46671 published?
The CVE record for CVE-2026-46671 was published on May 21, 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 24, 2026; the record at its source may have been updated since.
Is CVE-2026-46671 actively exploited?
CVE-2026-46671 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.2% probability of exploitation in the next 30 days (4th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-46671?
CVE-2026-46671 has a CVSS base score of 4.4 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-46671?
A fix for CVE-2026-46671 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-46671 are linked in the Vendor Advisories panel on this page.

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