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.
CVE-2026-47261
“—” 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.
Also known asEUVD-2026-37001 (ENISA EUVD) · GHSA-2r75-cxrj-cmph (GitHub Security Advisories)Source: ENISA EUVD
- High severity, but no confirmed exploitation yet
A fix is available — apply it.
- CVSS v3
- 7.5
- EG Score
- 7.5HIGHmedium confidence
- EG Risk
- 49EG 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, 2026WASI path_open(TRUNCATE) bypasses `FilePerms::WRITE` host restriction · Advisory · bytecodealliance/wasmtime · GitHub
https://github.com/bytecodealliance/wasmtime/security/advisories/GHSA-2r75-cxrj-cmphRelease v45.0.0 (bytecodealliance/wasmtime)
Patch available: bytecodealliance/wasmtime v45.0.0
https://github.com/bytecodealliance/wasmtime/releases/tag/v45.0.0Release v44.0.2 (bytecodealliance/wasmtime)
Patch available: bytecodealliance/wasmtime v44.0.2
https://github.com/bytecodealliance/wasmtime/releases/tag/v44.0.2Release v36.0.10 (bytecodealliance/wasmtime)
Patch available: bytecodealliance/wasmtime v36.0.10
https://github.com/bytecodealliance/wasmtime/releases/tag/v36.0.10Release v24.0.9 (bytecodealliance/wasmtime)
Patch available: bytecodealliance/wasmtime v24.0.9
https://github.com/bytecodealliance/wasmtime/releases/tag/v24.0.9Vendor 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 / Ecosystem | Fix (by version range) / Patch | Released | Source |
|---|---|---|---|
| rust | wasmtime-wasi @ 44.0.2 (fixes >= 37.0.0, < 44.0.2) | — | ghsa |
| rust | wasmtime-wasi @ 36.0.10 (fixes >= 25.0.0, < 36.0.10) | — | ghsa |
| rust | wasmtime-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)
| Package | Vulnerable range | Fix by version range | Dependents |
|---|---|---|---|
| wasmtime-wasi | — |
| — |
Debian:13(1)
| Package | Vulnerable range | Fix by version range | Dependents |
|---|---|---|---|
| rust-wasmtime | 26.0.1+dfsg-10 ... 36.0.9+dfsg-2 (43 versions) |
| — |
Debian:14(1)
| Package | Vulnerable range | Fix by version range | Dependents |
|---|---|---|---|
| rust-wasmtime | 26.0.1+dfsg-10 ... 36.0.9+dfsg-2 (38 versions) |
| — |
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 176 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 76 oldest rows on record are not shown and were not checked, so the counts can still include repeats.
- 2026-11-01 20:32 UTCEG score recompute
- 2026-11-01 20:31 UTCGHSA enrichmentGHSA-2r75-cxrj-cmph · GitHub severity HIGH · GitHub CVSS 7.5
- 2026-11-01 16:34 UTCEPSS rescoreEPSS 0.4% · 29th percentile
- 2026-11-01 07:47 UTCGHSA enrichmentGHSA-2r75-cxrj-cmph · GitHub severity HIGH · GitHub CVSS 7.5
- 2026-11-01 07:47 UTCEG score recompute
- 2026-10-31 16:32 UTCEPSS rescoreEPSS 0.4% · 29th percentile
- 2026-10-30 16:34 UTCEPSS rescoreEPSS 0.4% · 29th percentile
- 2026-10-29 16:33 UTCEPSS rescoreEPSS 0.4% · 29th percentile
- 2026-10-28 16:32 UTCEPSS rescoreEPSS 0.4% · 29th percentile
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- 2026-10-26 16:31 UTCEPSS rescoreEPSS 0.4% · 29th percentile
- 2026-10-25 23:31 UTCEG score recompute
- 2026-10-25 16:33 UTCEPSS rescoreEPSS 0.4% · 29th percentile
- 2026-10-25 14:24 UTCEG score recompute
- 2026-10-24 16:33 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
- 2026-10-24 09:52 UTCEG score recompute
- 2026-10-23 16:31 UTCEPSS rescoreEPSS 0.5% · 41st percentile
- 2026-10-22 16:34 UTCEPSS rescoreEPSS 0.5% · 41st percentile
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- 2026-10-18 03:36 UTCEG score recompute
- 2026-10-17 16:34 UTCEPSS rescoreEPSS 0.5% · 41st percentile
- 2026-10-17 12:52 UTCEG score recompute
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- 2026-10-16 16:42 UTCEPSS rescoreEPSS 0.5% · 41st percentile
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- 2026-10-12 16:02 UTCEG score recompute
- 2026-10-11 19:44 UTCEG score recompute
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- 2026-10-11 14:24 UTCEG score recompute
- 2026-10-11 13:48 UTCEPSS rescoreEPSS 0.5% · 41st percentile
- 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.5% · 41st percentile
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- 2026-10-03 11:09 UTCOSV refresh
- 2026-10-01 19:50 UTCEPSS rescoreEPSS 0.5% · 40th percentile
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- 2026-09-26 15:59 UTCEPSS rescoreEPSS 0.5% · 40th percentile
- 2026-09-26 00:27 UTCEPSS rescoreEPSS 0.5% · 40th percentile
- 2026-09-23 17:53 UTCEPSS rescoreEPSS 0.4% · 29th percentile
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- 2026-09-14 05:02 UTCEG score recompute
- 2026-09-13 16:47 UTCEPSS rescoreEPSS 0.4% · 29th percentile
- 2026-09-12 21:06 UTCOSV refresh
- 2026-09-12 15:01 UTCEPSS rescoreEPSS 0.4% · 29th percentile
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- 2026-08-25 01:57 UTCEG score recompute
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- 2026-08-20 09:41 UTCEG score recompute
- 2026-08-19 17:04 UTCEPSS rescoreEPSS 0.4% · 28th percentile
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- 2026-08-11 00:00 UTCEPSS rescoreEPSS 0.4% · 28th percentile
- 2026-08-09 23:02 UTCEG score recompute
- 2026-08-09 13:46 UTCEPSS rescoreEPSS 0.4% · 28th percentile
Related CVEs(same product + same CWE)
Same product
10 showncrates.io:wasmtime-wasi · Debian:13:rust-wasmtime
Frequently asked(5)
What is CVE-2026-47261?
When was the CVE record for CVE-2026-47261 published?
Is CVE-2026-47261 actively exploited?
What is the CVSS score of CVE-2026-47261?
How do I remediate CVE-2026-47261?
Dependency Blast Radius
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