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CVE-2026-8257

WebAssembly Binaryen BrOn wasm-ir-builder.cpp makeBrOn assertion

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.

CVSS 4.0 · 4.8 Medium EPSS < 1% KEV · Not listed
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CVE-2025-14957

WebAssembly Binaryen IRBuilder wasm-ir-builder.cpp makeLocalTee null pointer dereference

A vulnerability was identified in WebAssembly Binaryen up to 125. This affects the function IRBuilder::makeLocalGet/IRBuilder::makeLocalSet/IRBuilder::makeLocalTee of the file src/wasm/wasm-ir-builder.cpp of the component IRBuilder. Such manipulation of the argument Index leads to null pointer dereference. Local access is required to approach this attack. The exploit is publicly available and might be used. The name of the patch is 6fb2b917a79578ab44cf3b900a6da4c27251e0d4. Applying a patch is advised to resolve this issue.

CVSS 4.0 · 4.8 Medium EPSS < 1% KEV · Not listed
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CVE-2025-14956

WebAssembly Binaryen wasm-binary.cpp readExport heap-based overflow

A vulnerability was determined in WebAssembly Binaryen up to 125. Affected by this issue is the function WasmBinaryReader::readExport of the file src/wasm/wasm-binary.cpp. This manipulation causes heap-based buffer overflow. It is possible to launch the attack on the local host. The exploit has been publicly disclosed and may be utilized. Patch name: 4f52bff8c4075b5630422f902dd92a0af2c9f398. It is recommended to apply a patch to fix this issue.

CVSS 4.0 · 4.8 Medium EPSS < 1% KEV · Not listed
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CVE-2021-46055

A Denial of Service vulnerability exists in Binaryen 104 due to an assertion abort in wasm::WasmBinaryBuilder::visitRethrow(wasm::Rethrow*).

CVSS 3.1 · 5.5 Medium EPSS < 1% KEV · Not listed
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CVE-2021-46054

A Denial of Service vulnerability exists in Binaryen 104 due to an assertion abort in wasm::WasmBinaryBuilder::visitRethrow(wasm::Rethrow*).

CVSS 3.1 · 5.5 Medium EPSS < 1% KEV · Not listed
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CVE-2021-46053

A Denial of Service vulnerability exists in Binaryen 103. The program terminates with signal SIGKILL.

CVSS 3.1 · 5.5 Medium EPSS < 1% KEV · Not listed
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CVE-2021-46052

A Denial of Service vulnerability exists in Binaryen 104 due to an assertion abort in wasm::Tuple::validate.

CVSS 3.1 · 5.5 Medium EPSS < 1% KEV · Not listed
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CVE-2021-46050

A Stack Overflow vulnerability exists in Binaryen 103 via the printf_common function.

CVSS 3.1 · 5.5 Medium EPSS < 1% KEV · Not listed
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CVE-2021-46048

A Denial of Service vulnerability exists in Binaryen 104 due to an assertion abort in wasm::WasmBinaryBuilder::readFunctions.

CVSS 3.1 · 5.5 Medium EPSS < 1% KEV · Not listed
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CVE-2020-18382

Heap-buffer-overflow in /src/wasm/wasm-binary.cpp in wasm::WasmBinaryBuilder::visitBlock(wasm::Block*) in Binaryen 1.38.26. A crafted wasm input can cause a segmentation fault, leading to denial-of-service, as demonstrated by wasm-opt.

CVSS 3.1 · 6.5 Medium EPSS < 1% KEV · Not listed
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CVE-2020-18378

A NULL pointer dereference was discovered in SExpressionWasmBuilder::makeBlock in wasm/wasm-s-parser.c in Binaryen 1.38.26. A crafted wasm input can cause a segmentation fault, leading to denial-of-service, as demonstrated by wasm-as.

CVSS 3.1 · 6.5 Medium EPSS < 1% KEV · Not listed
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CVE-2019-7704

wasm::WasmBinaryBuilder::readUserSection in wasm-binary.cpp in Binaryen 1.38.22 triggers an attempt at excessive memory allocation, as demonstrated by wasm-merge and wasm-opt.

CVSS 3.1 · 6.5 Medium EPSS 1.2% KEV · Not listed
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CVE-2019-7703

In Binaryen 1.38.22, there is a use-after-free problem in wasm::WasmBinaryBuilder::visitCall in wasm-binary.cpp. Remote attackers could leverage this vulnerability to cause a denial-of-service via a wasm file, as demonstrated by wasm-merge.

CVSS 3.1 · 6.5 Medium EPSS 1.5% KEV · Not listed
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CVE-2019-7702

A NULL pointer dereference was discovered in wasm::SExpressionWasmBuilder::parseExpression in wasm-s-parser.cpp in Binaryen 1.38.22. A crafted wasm input can cause a segmentation fault, leading to denial-of-service, as demonstrated by wasm-as.

CVSS 3.1 · 6.5 Medium EPSS 1.1% KEV · Not listed
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CVE-2019-7701

A heap-based buffer over-read was discovered in wasm::SExpressionParser::skipWhitespace() in wasm-s-parser.cpp in Binaryen 1.38.22. A crafted wasm input can cause a segmentation fault, leading to denial-of-service, as demonstrated by wasm2js.

CVSS 3.1 · 6.5 Medium EPSS 1.2% KEV · Not listed
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CVE-2019-7700

A heap-based buffer over-read was discovered in wasm::WasmBinaryBuilder::visitCall in wasm-binary.cpp in Binaryen 1.38.22. A crafted wasm input can cause a segmentation fault, leading to denial-of-service, as demonstrated by wasm-merge.

CVSS 3.1 · 6.5 Medium EPSS 1.2% KEV · Not listed
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CVE-2019-7662

An assertion failure was discovered in wasm::WasmBinaryBuilder::getType() in wasm-binary.cpp in Binaryen 1.38.22. This allows remote attackers to cause a denial of service (failed assertion and crash) via a crafted wasm file.

CVSS 3.1 · 6.5 Medium EPSS 1.6% KEV · Not listed
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CVE-2019-7154

The main function in tools/wasm2js.cpp in Binaryen 1.38.22 has a heap-based buffer overflow because Emscripten is misused, triggering an error in cashew::JSPrinter::printAst() in emscripten-optimizer/simple_ast.h. A crafted input can cause segmentation faults, leading to denial-of-service, as demonstrated by wasm2js.

CVSS 3.1 · 6.5 Medium EPSS 1.1% KEV · Not listed
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