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CVE-2026-8257

A vulnerability was detected in WebAssembly Binaryen up to 117. This issue affects the function IRBuilder::makeBrOn of the file src/wasm/wasm-ir-builder.cpp of the component BrOn Parser. Performing a manipulation results in reachable assertion. The attack needs to be approached locally. The exploit is now public and may be used. The patch is named 1251efbc1ea471c1311d2726b2bbe061ff2a291c. It is suggested to install a patch to address this issue.
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:bce50af2fe00ca2da6cef073e4f28b777b23c60fc26d75c5cc92a7e762ba1350
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
1

Preserved source conflicts

No provider value was silently selected as the winner.

cvss · 4 assertions

{"metric":{"baseScore":4.8,"baseSeverity":"MEDIUM","vectorString":"CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P","version":"4.0"},"metric_type":"cvssV4_0"}

  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:79a0f79963ea5a5a78e367e660776a2fde5e1df92f64668ba7753f14f3480185 · sha256:8171ab802ae7bc8f… · /containers/cna/metrics/0/cvssV4_0

{"metric":{"baseScore":3.3,"baseSeverity":"LOW","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L/E:P/RL:O/RC:C","version":"3.1"},"metric_type":"cvssV3_1"}

  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:79a0f79963ea5a5a78e367e660776a2fde5e1df92f64668ba7753f14f3480185 · sha256:8171ab802ae7bc8f… · /containers/cna/metrics/1/cvssV3_1

{"metric":{"baseScore":1.7,"vectorString":"AV:L/AC:L/Au:S/C:N/I:N/A:P/E:POC/RL:OF/RC:C","version":"2.0"},"metric_type":"cvssV2_0"}

  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:79a0f79963ea5a5a78e367e660776a2fde5e1df92f64668ba7753f14f3480185 · sha256:8171ab802ae7bc8f… · /containers/cna/metrics/3/cvssV2_0

{"metric":{"baseScore":3.3,"baseSeverity":"LOW","vectorString":"CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L/E:P/RL:O/RC:C","version":"3.0"},"metric_type":"cvssV3_0"}

  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:79a0f79963ea5a5a78e367e660776a2fde5e1df92f64668ba7753f14f3480185 · sha256:8171ab802ae7bc8f… · /containers/cna/metrics/2/cvssV3_0

Affected products and versions

1 source assertion
{"cpes":["cpe:2.3:a:webassembly:binaryen:*:*:*:*:*:*:*:*"],"modules":["BrOn Parser"],"product":"Binaryen","vendor":"WebAssembly","versions":[{"status":"affected","version":"117"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:79a0f79963ea5a5a78e367e660776a2fde5e1df92f64668ba7753f14f3480185 · sha256:8171ab802ae7bc8f… · /containers/cna/affected/0

Provider-owned CVSS observations

4 source assertions
{"metric":{"baseScore":4.8,"baseSeverity":"MEDIUM","vectorString":"CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P","version":"4.0"},"metric_type":"cvssV4_0"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:79a0f79963ea5a5a78e367e660776a2fde5e1df92f64668ba7753f14f3480185 · sha256:8171ab802ae7bc8f… · /containers/cna/metrics/0/cvssV4_0
{"metric":{"baseScore":3.3,"baseSeverity":"LOW","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L/E:P/RL:O/RC:C","version":"3.1"},"metric_type":"cvssV3_1"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:79a0f79963ea5a5a78e367e660776a2fde5e1df92f64668ba7753f14f3480185 · sha256:8171ab802ae7bc8f… · /containers/cna/metrics/1/cvssV3_1
{"metric":{"baseScore":1.7,"vectorString":"AV:L/AC:L/Au:S/C:N/I:N/A:P/E:POC/RL:OF/RC:C","version":"2.0"},"metric_type":"cvssV2_0"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:79a0f79963ea5a5a78e367e660776a2fde5e1df92f64668ba7753f14f3480185 · sha256:8171ab802ae7bc8f… · /containers/cna/metrics/3/cvssV2_0
{"metric":{"baseScore":3.3,"baseSeverity":"LOW","vectorString":"CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L/E:P/RL:O/RC:C","version":"3.0"},"metric_type":"cvssV3_0"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:79a0f79963ea5a5a78e367e660776a2fde5e1df92f64668ba7753f14f3480185 · sha256:8171ab802ae7bc8f… · /containers/cna/metrics/2/cvssV3_0

CWE assertions

1 source assertion
{"cweId":"CWE-617","description":"Reachable Assertion","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:79a0f79963ea5a5a78e367e660776a2fde5e1df92f64668ba7753f14f3480185 · sha256:8171ab802ae7bc8f… · /containers/cna/problemTypes/0/descriptions/0

Source references

8 source assertions
{"tags":["exploit","patch"],"url":"https://github.com/HackC0der/CVE-Repos/blob/main/wasm-binaryen/Assertion_Failure_isRef_wasm_Type_getHeapType_commit_3ef8d19"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:79a0f79963ea5a5a78e367e660776a2fde5e1df92f64668ba7753f14f3480185 · sha256:8171ab802ae7bc8f… · /containers/cna/references/5
{"tags":["product"],"url":"https://github.com/WebAssembly/binaryen/"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:79a0f79963ea5a5a78e367e660776a2fde5e1df92f64668ba7753f14f3480185 · sha256:8171ab802ae7bc8f… · /containers/cna/references/7
{"tags":["patch"],"url":"https://github.com/WebAssembly/binaryen/commit/1251efbc1ea471c1311d2726b2bbe061ff2a291c"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:79a0f79963ea5a5a78e367e660776a2fde5e1df92f64668ba7753f14f3480185 · sha256:8171ab802ae7bc8f… · /containers/cna/references/6
{"tags":["issue-tracking"],"url":"https://github.com/WebAssembly/binaryen/issues/8633"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:79a0f79963ea5a5a78e367e660776a2fde5e1df92f64668ba7753f14f3480185 · sha256:8171ab802ae7bc8f… · /containers/cna/references/3
{"tags":["issue-tracking","patch"],"url":"https://github.com/WebAssembly/binaryen/pull/8635"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:79a0f79963ea5a5a78e367e660776a2fde5e1df92f64668ba7753f14f3480185 · sha256:8171ab802ae7bc8f… · /containers/cna/references/4
{"name":"Submit #809552 | WebAssembly Community Binaryen main branch commit 3ef8d19 (v117 development version, vulnerable version before fix commit 1251efb) Fixed version: commit 1251ef Assertion Failure, Denial of Service (Local DoS)","tags":["third-party-advisory"],"url":"https://vuldb.com/submit/809552"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:79a0f79963ea5a5a78e367e660776a2fde5e1df92f64668ba7753f14f3480185 · sha256:8171ab802ae7bc8f… · /containers/cna/references/2
{"name":"VDB-362554 | WebAssembly Binaryen BrOn wasm-ir-builder.cpp makeBrOn assertion","tags":["vdb-entry","technical-description"],"url":"https://vuldb.com/vuln/362554"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:79a0f79963ea5a5a78e367e660776a2fde5e1df92f64668ba7753f14f3480185 · sha256:8171ab802ae7bc8f… · /containers/cna/references/0
{"name":"VDB-362554 | CTI Indicators (IOB, IOC, IOA)","tags":["signature","permissions-required"],"url":"https://vuldb.com/vuln/362554/cti"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:79a0f79963ea5a5a78e367e660776a2fde5e1df92f64668ba7753f14f3480185 · sha256:8171ab802ae7bc8f… · /containers/cna/references/1

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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