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CVE-2026-34971

Wasmtime is a runtime for WebAssembly. From 32.0.0 to before 36.0.7, 42.0.2, and 43.0.1, Wasmtime's Cranelift compilation backend contains a bug on aarch64 when performing a certain shape of heap accesses which means that the wrong address is accessed. When combined with explicit bounds checks a guest WebAssembly module this can create a situation where there are two diverging computations for the same address: one for the address to bounds-check and one for the address to load. This difference
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:ed51946d2f6242775756100bd324f3d6228f5ca9fa8570e3981598eccd34b632
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
3

Preserved source conflicts

No provider value was silently selected as the winner.

affected · 3 assertions

{"collectionURL":"https://access.redhat.com/downloads/content/package-browser/","cpes":["cpe:/a:redhat:connectivity_link:1"],"defaultStatus":"affected","packageName":"redhat-user-workloads/rhcl-1-3-wasm-shim","product":"Red Hat Connectivity Link 1","vendor":"Red Hat"}

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:044c6731c6d12571aa2da1499d0b18e0afeaa7a67ed58b1c216377ce182a1a48 · sha256:6cbd70949899a81f… · /containers/adp/1/affected/0

{"collectionURL":"https://access.redhat.com/downloads/content/package-browser/","cpes":["cpe:/o:redhat:enterprise_linux:10"],"defaultStatus":"unaffected","packageName":"virt-firmware-rs","product":"Red Hat Enterprise Linux 10","vendor":"Red Hat"}

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:044c6731c6d12571aa2da1499d0b18e0afeaa7a67ed58b1c216377ce182a1a48 · sha256:6cbd70949899a81f… · /containers/adp/1/affected/1

{"product":"wasmtime","vendor":"bytecodealliance","versions":[{"status":"affected","version":">= 32.0.0, < 36.0.7"},{"status":"affected","version":">= 37.0.0, < 42.0.2"},{"status":"affected","version":">= 43.0.0, < 44.0.1"}]}

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:044c6731c6d12571aa2da1499d0b18e0afeaa7a67ed58b1c216377ce182a1a48 · sha256:6cbd70949899a81f… · /containers/cna/affected/0
cvss · 3 assertions

{"metric":{"attackComplexity":"HIGH","attackVector":"NETWORK","availabilityImpact":"HIGH","baseScore":8.5,"baseSeverity":"HIGH","confidentialityImpact":"HIGH","integrityImpact":"HIGH","privilegesRequired":"LOW","scope":"CHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H","version":"3.1"},"metric_type":"cvssV3_1"}

  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:044c6731c6d12571aa2da1499d0b18e0afeaa7a67ed58b1c216377ce182a1a48 · sha256:6cbd70949899a81f… · /containers/adp/1/metrics/1/cvssV3_1

{"metric":{"attackComplexity":"LOW","attackRequirements":"PRESENT","attackVector":"NETWORK","baseScore":9,"baseSeverity":"CRITICAL","privilegesRequired":"LOW","subAvailabilityImpact":"HIGH","subConfidentialityImpact":"HIGH","subIntegrityImpact":"HIGH","userInteraction":"NONE","vectorString":"CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H","version":"4.0","vulnAvailabilityImpact":"HIGH","vulnConfidentialityImpact":"HIGH","vulnIntegrityImpact":"HIGH"},"metric_type":"cvssV4_0"}

  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:044c6731c6d12571aa2da1499d0b18e0afeaa7a67ed58b1c216377ce182a1a48 · sha256:6cbd70949899a81f… · /containers/cna/metrics/0/cvssV4_0

{"metric":{"attackComplexity":"HIGH","attackVector":"LOCAL","availabilityImpact":"HIGH","baseScore":7.8,"baseSeverity":"HIGH","confidentialityImpact":"HIGH","integrityImpact":"HIGH","privilegesRequired":"LOW","scope":"CHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H","version":"3.1"},"metric_type":"cvssV3_1"}

  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:044c6731c6d12571aa2da1499d0b18e0afeaa7a67ed58b1c216377ce182a1a48 · sha256:6cbd70949899a81f… · /containers/adp/0/metrics/0/cvssV3_1
cwe · 3 assertions

{"cweId":"CWE-125","description":"Out-of-bounds Read","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:044c6731c6d12571aa2da1499d0b18e0afeaa7a67ed58b1c216377ce182a1a48 · sha256:6cbd70949899a81f… · /containers/adp/1/problemTypes/0/descriptions/0

{"cweId":"CWE-787","description":"CWE-787: Out-of-bounds Write","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:044c6731c6d12571aa2da1499d0b18e0afeaa7a67ed58b1c216377ce182a1a48 · sha256:6cbd70949899a81f… · /containers/cna/problemTypes/1/descriptions/0

{"cweId":"CWE-125","description":"CWE-125: Out-of-bounds Read","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:044c6731c6d12571aa2da1499d0b18e0afeaa7a67ed58b1c216377ce182a1a48 · sha256:6cbd70949899a81f… · /containers/cna/problemTypes/0/descriptions/0

Affected products and versions

3 source assertions
{"collectionURL":"https://access.redhat.com/downloads/content/package-browser/","cpes":["cpe:/a:redhat:connectivity_link:1"],"defaultStatus":"affected","packageName":"redhat-user-workloads/rhcl-1-3-wasm-shim","product":"Red Hat Connectivity Link 1","vendor":"Red Hat"}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:044c6731c6d12571aa2da1499d0b18e0afeaa7a67ed58b1c216377ce182a1a48 · sha256:6cbd70949899a81f… · /containers/adp/1/affected/0
{"collectionURL":"https://access.redhat.com/downloads/content/package-browser/","cpes":["cpe:/o:redhat:enterprise_linux:10"],"defaultStatus":"unaffected","packageName":"virt-firmware-rs","product":"Red Hat Enterprise Linux 10","vendor":"Red Hat"}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:044c6731c6d12571aa2da1499d0b18e0afeaa7a67ed58b1c216377ce182a1a48 · sha256:6cbd70949899a81f… · /containers/adp/1/affected/1
{"product":"wasmtime","vendor":"bytecodealliance","versions":[{"status":"affected","version":">= 32.0.0, < 36.0.7"},{"status":"affected","version":">= 37.0.0, < 42.0.2"},{"status":"affected","version":">= 43.0.0, < 44.0.1"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:044c6731c6d12571aa2da1499d0b18e0afeaa7a67ed58b1c216377ce182a1a48 · sha256:6cbd70949899a81f… · /containers/cna/affected/0

Provider-owned CVSS observations

3 source assertions
{"metric":{"attackComplexity":"HIGH","attackVector":"NETWORK","availabilityImpact":"HIGH","baseScore":8.5,"baseSeverity":"HIGH","confidentialityImpact":"HIGH","integrityImpact":"HIGH","privilegesRequired":"LOW","scope":"CHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H","version":"3.1"},"metric_type":"cvssV3_1"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:044c6731c6d12571aa2da1499d0b18e0afeaa7a67ed58b1c216377ce182a1a48 · sha256:6cbd70949899a81f… · /containers/adp/1/metrics/1/cvssV3_1
{"metric":{"attackComplexity":"LOW","attackRequirements":"PRESENT","attackVector":"NETWORK","baseScore":9,"baseSeverity":"CRITICAL","privilegesRequired":"LOW","subAvailabilityImpact":"HIGH","subConfidentialityImpact":"HIGH","subIntegrityImpact":"HIGH","userInteraction":"NONE","vectorString":"CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H","version":"4.0","vulnAvailabilityImpact":"HIGH","vulnConfidentialityImpact":"HIGH","vulnIntegrityImpact":"HIGH"},"metric_type":"cvssV4_0"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:044c6731c6d12571aa2da1499d0b18e0afeaa7a67ed58b1c216377ce182a1a48 · sha256:6cbd70949899a81f… · /containers/cna/metrics/0/cvssV4_0
{"metric":{"attackComplexity":"HIGH","attackVector":"LOCAL","availabilityImpact":"HIGH","baseScore":7.8,"baseSeverity":"HIGH","confidentialityImpact":"HIGH","integrityImpact":"HIGH","privilegesRequired":"LOW","scope":"CHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H","version":"3.1"},"metric_type":"cvssV3_1"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:044c6731c6d12571aa2da1499d0b18e0afeaa7a67ed58b1c216377ce182a1a48 · sha256:6cbd70949899a81f… · /containers/adp/0/metrics/0/cvssV3_1

CWE assertions

3 source assertions
{"cweId":"CWE-125","description":"Out-of-bounds Read","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:044c6731c6d12571aa2da1499d0b18e0afeaa7a67ed58b1c216377ce182a1a48 · sha256:6cbd70949899a81f… · /containers/adp/1/problemTypes/0/descriptions/0
{"cweId":"CWE-787","description":"CWE-787: Out-of-bounds Write","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:044c6731c6d12571aa2da1499d0b18e0afeaa7a67ed58b1c216377ce182a1a48 · sha256:6cbd70949899a81f… · /containers/cna/problemTypes/1/descriptions/0
{"cweId":"CWE-125","description":"CWE-125: Out-of-bounds Read","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:044c6731c6d12571aa2da1499d0b18e0afeaa7a67ed58b1c216377ce182a1a48 · sha256:6cbd70949899a81f… · /containers/cna/problemTypes/0/descriptions/0

Source references

4 source assertions
{"tags":["vdb-entry","x_refsource_REDHAT"],"url":"https://access.redhat.com/security/cve/CVE-2026-34971"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:044c6731c6d12571aa2da1499d0b18e0afeaa7a67ed58b1c216377ce182a1a48 · sha256:6cbd70949899a81f… · /containers/adp/1/references/0
{"name":"RHBZ#2457008","tags":["issue-tracking","x_refsource_REDHAT"],"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2457008"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:044c6731c6d12571aa2da1499d0b18e0afeaa7a67ed58b1c216377ce182a1a48 · sha256:6cbd70949899a81f… · /containers/adp/1/references/1
{"name":"https://github.com/bytecodealliance/wasmtime/security/advisories/GHSA-jhxm-h53p-jm7w","tags":["x_refsource_CONFIRM"],"url":"https://github.com/bytecodealliance/wasmtime/security/advisories/GHSA-jhxm-h53p-jm7w"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:044c6731c6d12571aa2da1499d0b18e0afeaa7a67ed58b1c216377ce182a1a48 · sha256:6cbd70949899a81f… · /containers/cna/references/0
{"tags":["x_sadp-csaf-vex"],"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-34971.json"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:044c6731c6d12571aa2da1499d0b18e0afeaa7a67ed58b1c216377ce182a1a48 · sha256:6cbd70949899a81f… · /containers/adp/1/references/2

Attribution and limitations

  • CVE Program CVEList V5: Reproduce the MITRE copyright designation and CVE license in copies. Source →

Provider severity values are preserved separately. Baitaphish does not convert them into a risk rating, infer affected products, or treat EPSS as observed exploitation.

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