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CVE-2026-27572

Wasmtime is a runtime for WebAssembly. Prior to versions 24.0.6, 36.0.6, 4.0.04, 41.0.4, and 42.0.0, Wasmtime's implementation of the `wasi:http/types.fields` resource is susceptible to panics when too many fields are added to the set of headers. Wasmtime's implementation in the `wasmtime-wasi-http` crate is backed by a data structure which panics when it reaches excessive capacity and this condition was not handled gracefully in Wasmtime. Panicking in a WASI implementation is a Denial of Servic
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:d4a81c959c3cab202c06aa04a01636e8316fc424b6ae728ac107ea38a818bf16
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
0

Affected products and versions

1 source assertion
{"product":"wasmtime","vendor":"bytecodealliance","versions":[{"status":"affected","version":"< 24.0.6"},{"status":"affected","version":">= 25.0.0, < 36.0.6"},{"status":"affected","version":">= 37.0.0, < 40.0.4"},{"status":"affected","version":">= 41.0.0, < 41.0.4"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:6d5ca8eabd6ee0af3b0b40dcf84fd8ece96c5a07034e56b3d56e258fcacefd80 · sha256:7c38c3d5eaf6bde5… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion
{"metric":{"attackComplexity":"LOW","attackRequirements":"PRESENT","attackVector":"NETWORK","baseScore":6.9,"baseSeverity":"MEDIUM","privilegesRequired":"LOW","subAvailabilityImpact":"HIGH","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","userInteraction":"PASSIVE","vectorString":"CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:H","version":"4.0","vulnAvailabilityImpact":"HIGH","vulnConfidentialityImpact":"NONE","vulnIntegrityImpact":"NONE"},"metric_type":"cvssV4_0"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:6d5ca8eabd6ee0af3b0b40dcf84fd8ece96c5a07034e56b3d56e258fcacefd80 · sha256:7c38c3d5eaf6bde5… · /containers/cna/metrics/0/cvssV4_0

CWE assertions

1 source assertion
{"cweId":"CWE-770","description":"CWE-770: Allocation of Resources Without Limits or Throttling","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:6d5ca8eabd6ee0af3b0b40dcf84fd8ece96c5a07034e56b3d56e258fcacefd80 · sha256:7c38c3d5eaf6bde5… · /containers/cna/problemTypes/0/descriptions/0

Source references

7 source assertions
{"name":"https://docs.rs/http/1.4.0/http/header/#limitations","tags":["x_refsource_MISC"],"url":"https://docs.rs/http/1.4.0/http/header/#limitations"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:6d5ca8eabd6ee0af3b0b40dcf84fd8ece96c5a07034e56b3d56e258fcacefd80 · sha256:7c38c3d5eaf6bde5… · /containers/cna/references/2
{"name":"https://github.com/bytecodealliance/wasmtime/commit/301dc7162cca51def19131019af1187f45901c0a","tags":["x_refsource_MISC"],"url":"https://github.com/bytecodealliance/wasmtime/commit/301dc7162cca51def19131019af1187f45901c0a"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:6d5ca8eabd6ee0af3b0b40dcf84fd8ece96c5a07034e56b3d56e258fcacefd80 · sha256:7c38c3d5eaf6bde5… · /containers/cna/references/1
{"name":"https://github.com/bytecodealliance/wasmtime/releases/tag/v24.0.6","tags":["x_refsource_MISC"],"url":"https://github.com/bytecodealliance/wasmtime/releases/tag/v24.0.6"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:6d5ca8eabd6ee0af3b0b40dcf84fd8ece96c5a07034e56b3d56e258fcacefd80 · sha256:7c38c3d5eaf6bde5… · /containers/cna/references/3
{"name":"https://github.com/bytecodealliance/wasmtime/releases/tag/v36.0.6","tags":["x_refsource_MISC"],"url":"https://github.com/bytecodealliance/wasmtime/releases/tag/v36.0.6"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:6d5ca8eabd6ee0af3b0b40dcf84fd8ece96c5a07034e56b3d56e258fcacefd80 · sha256:7c38c3d5eaf6bde5… · /containers/cna/references/4
{"name":"https://github.com/bytecodealliance/wasmtime/releases/tag/v40.0.4","tags":["x_refsource_MISC"],"url":"https://github.com/bytecodealliance/wasmtime/releases/tag/v40.0.4"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:6d5ca8eabd6ee0af3b0b40dcf84fd8ece96c5a07034e56b3d56e258fcacefd80 · sha256:7c38c3d5eaf6bde5… · /containers/cna/references/5
{"name":"https://github.com/bytecodealliance/wasmtime/releases/tag/v41.0.4","tags":["x_refsource_MISC"],"url":"https://github.com/bytecodealliance/wasmtime/releases/tag/v41.0.4"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:6d5ca8eabd6ee0af3b0b40dcf84fd8ece96c5a07034e56b3d56e258fcacefd80 · sha256:7c38c3d5eaf6bde5… · /containers/cna/references/6
{"name":"https://github.com/bytecodealliance/wasmtime/security/advisories/GHSA-243v-98vx-264h","tags":["x_refsource_CONFIRM"],"url":"https://github.com/bytecodealliance/wasmtime/security/advisories/GHSA-243v-98vx-264h"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:6d5ca8eabd6ee0af3b0b40dcf84fd8ece96c5a07034e56b3d56e258fcacefd80 · sha256:7c38c3d5eaf6bde5… · /containers/cna/references/0

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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