CVE-2026-47261

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 2026-06-05. 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
Trending — 3 sources updated this week

Also known asEUVD-2026-37001 (ENISA EUVD) · GHSA-2r75-cxrj-cmph (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: 0.4%CVSS: 7.5Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

Wasmtime is a runtime for WebAssembly. In versions prior to 24.0.9, 36.0.10, and 44.0.2, when a filesystem preopen is given DirPerms::all() and FilePerms::READ without FilePerms::WRITE, this access control mechanism can be bypassed via the wasip2 descriptor.open-at or wasip1 path_open interfaces by opening a file with only the OpenFlags::TRUNCATE oflag. The root cause is that the clause handling OpenFlags::TRUNCATE in crates/wasi/src/filesystem.rs (Dir::open_at, lines 967–969) did not set open_mode |= OpenMode::WRITE;, which is later used for the access control check against FilePerms to determine whether opening the file is permitted; the single-line fix adds that missing assignment, after which the affected calls correctly fail with error-code.not-permitted and ERRNO_PERM respectively. Only wasmtime-wasi embeddings that combine DirPerms::MUTATE with FilePerms::READ are affected by this bug. In particular, the Wasmtime project's wasmtime-cli's use of wasmtime-wasi is not affected, because it always sets FilePerms::all() for all preopens. This issue has been fixed in versions 24.0.9, 36.0.10 and44.0.2.

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.
Exploitation0.4% × 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
0.4%
EPSS %ILE
29th
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
0.4% within 30 daysSource: FIRST EPSS (model v2026.06.15, score date 2026-11-01). 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

June 5, 2026

Last Modified

October 25, 2026

Advisory Details (5)

Auto-updated Jun 15, 2026
Patch available. Sources: github_release, github.
GitHub advisoryMentions a patch (unverified)

WASI path_open(TRUNCATE) bypasses `FilePerms::WRITE` host restriction · Advisory · bytecodealliance/wasmtime · GitHub

https://github.com/bytecodealliance/wasmtime/security/advisories/GHSA-2r75-cxrj-cmph
GitHub release Patch Available

Release v45.0.0 (bytecodealliance/wasmtime)

Patch available: bytecodealliance/wasmtime v45.0.0

https://github.com/bytecodealliance/wasmtime/releases/tag/v45.0.0
GitHub release Patch Available

Release v44.0.2 (bytecodealliance/wasmtime)

Patch available: bytecodealliance/wasmtime v44.0.2

https://github.com/bytecodealliance/wasmtime/releases/tag/v44.0.2
GitHub release Patch Available

Release v36.0.10 (bytecodealliance/wasmtime)

Patch available: bytecodealliance/wasmtime v36.0.10

https://github.com/bytecodealliance/wasmtime/releases/tag/v36.0.10
GitHub release Patch Available

Release v24.0.9 (bytecodealliance/wasmtime)

Patch available: bytecodealliance/wasmtime v24.0.9

https://github.com/bytecodealliance/wasmtime/releases/tag/v24.0.9

Vendor Advisories for CVE-2026-47261(1)

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

Patch Availability(3)

Vendor / EcosystemFix (by version range) / PatchReleasedSource
rustwasmtime-wasi @ 44.0.2 (fixes >= 37.0.0, < 44.0.2)—ghsa
rustwasmtime-wasi @ 36.0.10 (fixes >= 25.0.0, < 36.0.10)—ghsa
rustwasmtime-wasi @ 24.0.9 (fixes < 24.0.9)—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

(3 across 3 ecosystems)
crates.io(1)
PackageVulnerable rangeFix by version rangeDependents
wasmtime-wasi—
  • 37.0.0 up to 44.0.2: fixed in 44.0.2
  • 25.0.0 up to 36.0.10: fixed in 36.0.10
  • every version up to 24.0.9: fixed in 24.0.9
  • 0.0.0-0 up to 24.0.9: fixed in 24.0.9
  • 45.0.0 up to 45.0.0: fixed in 45.0.0
—
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
rust-wasmtime26.0.1+dfsg-10 ... 36.0.9+dfsg-2 (43 versions)
  • every version on: no fix on record
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
rust-wasmtime26.0.1+dfsg-10 ... 36.0.9+dfsg-2 (38 versions)
  • every version up to 36.0.11+dfsg-1: fixed in 36.0.11+dfsg-1
—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 11× in last 7d / 43× 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 177 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 77 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 0.4% · 29th percentile
  2. 2026-11-01 20:32 UTCEG score recompute
  3. 2026-11-01 20:31 UTCGHSA enrichmentGHSA-2r75-cxrj-cmph · GitHub severity HIGH · GitHub CVSS 7.5
  4. 2026-11-01 16:34 UTCEPSS rescoreEPSS 0.4% · 29th percentile
  5. 2026-11-01 07:47 UTCGHSA enrichmentGHSA-2r75-cxrj-cmph · GitHub severity HIGH · GitHub CVSS 7.5
  6. 2026-11-01 07:47 UTCEG score recompute
  7. 2026-10-31 16:32 UTCEPSS rescoreEPSS 0.4% · 29th percentile
  8. 2026-10-30 16:34 UTCEPSS rescoreEPSS 0.4% · 29th percentile
  9. 2026-10-29 16:33 UTCEPSS rescoreEPSS 0.4% · 29th percentile
  10. 2026-10-28 16:32 UTCEPSS rescoreEPSS 0.4% · 29th percentile
  11. 2026-10-27 16:32 UTCEPSS rescoreEPSS 0.4% · 29th percentile
  12. 2026-10-26 16:31 UTCEPSS rescoreEPSS 0.4% · 29th percentile
  13. 2026-10-25 23:31 UTCEG score recompute
  14. 2026-10-25 16:33 UTCEPSS rescoreEPSS 0.4% · 29th percentile
  15. 2026-10-25 14:24 UTCEG score recompute
  16. 2026-10-24 16:33 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  17. 2026-10-24 09:52 UTCEG score recompute
  18. 2026-10-23 16:31 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  19. 2026-10-22 16:34 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  20. 2026-10-21 16:33 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  21. 2026-10-20 16:33 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  22. 2026-10-19 16:32 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  23. 2026-10-18 16:32 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  24. 2026-10-18 03:36 UTCEG score recompute
  25. 2026-10-17 16:34 UTCEPSS rescoreEPSS 0.5% · 41st percentile
Show 75 more
  1. 2026-10-17 12:52 UTCEG score recompute
  2. 2026-10-16 16:42 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  3. 2026-10-15 16:32 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  4. 2026-10-14 16:33 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  5. 2026-10-13 16:34 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  6. 2026-10-12 16:34 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  7. 2026-10-12 16:02 UTCEG score recompute
  8. 2026-10-11 19:44 UTCEG score recompute
  9. 2026-10-11 16:59 UTCEG score recompute
  10. 2026-10-11 14:24 UTCEG score recompute
  11. 2026-10-11 13:48 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  12. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  13. 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  14. 2026-10-08 17:12 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  15. 2026-10-07 23:48 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  16. 2026-10-06 15:18 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  17. 2026-10-05 17:43 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  18. 2026-10-04 23:22 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  19. 2026-10-03 14:25 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  20. 2026-10-03 11:09 UTCOSV refresh
  21. 2026-10-01 19:50 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  22. 2026-09-30 15:03 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  23. 2026-09-28 13:51 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  24. 2026-09-27 13:48 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  25. 2026-09-26 15:59 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  26. 2026-09-26 00:27 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  27. 2026-09-23 17:53 UTCEPSS rescoreEPSS 0.4% · 29th percentile
  28. 2026-09-20 20:16 UTCEPSS rescoreEPSS 0.4% · 29th percentile
  29. 2026-09-18 19:28 UTCEPSS rescoreEPSS 0.4% · 29th percentile
  30. 2026-09-16 14:08 UTCEPSS rescoreEPSS 0.4% · 29th percentile
  31. 2026-09-16 05:15 UTCEPSS rescoreEPSS 0.4% · 29th percentile
  32. 2026-09-14 05:02 UTCEG score recompute
  33. 2026-09-13 16:47 UTCEPSS rescoreEPSS 0.4% · 29th percentile
  34. 2026-09-12 21:06 UTCOSV refresh
  35. 2026-09-12 15:01 UTCEPSS rescoreEPSS 0.4% · 29th percentile
  36. 2026-09-11 14:53 UTCEPSS rescoreEPSS 0.4% · 29th percentile
  37. 2026-09-11 09:37 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  38. 2026-09-10 09:34 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  39. 2026-09-08 22:00 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  40. 2026-09-07 16:01 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  41. 2026-09-06 13:47 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  42. 2026-09-04 05:06 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  43. 2026-09-02 14:12 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  44. 2026-09-01 13:54 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  45. 2026-08-30 19:17 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  46. 2026-08-30 01:22 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  47. 2026-08-28 21:41 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  48. 2026-08-27 14:25 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  49. 2026-08-26 14:46 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  50. 2026-08-25 13:49 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  51. 2026-08-25 01:57 UTCEG score recompute
  52. 2026-08-23 12:27 UTCEG score recompute
  53. 2026-08-23 00:19 UTCEPSS rescoreEPSS 0.4% · 29th percentile
  54. 2026-08-22 01:11 UTCEG score recompute
  55. 2026-08-21 23:49 UTCEPSS rescoreEPSS 0.4% · 29th percentile
  56. 2026-08-21 12:47 UTCEG score recompute
  57. 2026-08-20 22:55 UTCEPSS rescoreEPSS 0.4% · 29th percentile
  58. 2026-08-20 09:41 UTCEG score recompute
  59. 2026-08-19 17:04 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  60. 2026-08-18 13:48 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  61. 2026-08-17 13:47 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  62. 2026-08-16 17:09 UTCEG score recompute
  63. 2026-08-16 14:56 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  64. 2026-08-16 04:49 UTCEG score recompute
  65. 2026-08-16 02:14 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  66. 2026-08-15 04:09 UTCEG score recompute
  67. 2026-08-15 01:30 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  68. 2026-08-14 03:28 UTCEG score recompute
  69. 2026-08-13 22:00 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  70. 2026-08-13 01:24 UTCEG score recompute
  71. 2026-08-12 13:51 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  72. 2026-08-12 00:26 UTCEG score recompute
  73. 2026-08-11 12:06 UTCEG score recompute
  74. 2026-08-11 00:00 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  75. 2026-08-09 23:02 UTCEG score recompute

Frequently asked(5)

What is CVE-2026-47261?
CVE-2026-47261 is a high-severity vulnerability; its CVE record was published on June 5, 2026. Wasmtime is a runtime for WebAssembly. In versions prior to 24.0.9, 36.0.10, and 44.0.2, when a filesystem preopen is given DirPerms::all() and FilePerms::READ without FilePerms::WRITE, this access control mechanism can be bypassed via the wasip2 descriptor.open-at or wasip1 path_open interfaces by…
When was the CVE record for CVE-2026-47261 published?
The CVE record for CVE-2026-47261 was published on June 5, 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 25, 2026; the record at its source may have been updated since.
Is CVE-2026-47261 actively exploited?
CVE-2026-47261 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.4% probability of exploitation in the next 30 days (29th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-47261?
CVE-2026-47261 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-2026-47261?
A fix for CVE-2026-47261 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-47261 are linked in the Vendor Advisories panel on this page.

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