4.3 Medium
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
LOW
Availability Impact
NONE
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N
5.1 Medium
AI Score
Confidence
High
0.002 Low
EPSS
Percentile
52.8%
wasmtime is a fast and secure runtime for WebAssembly. Wasmtime’s code generation backend, Cranelift, has a bug on x86_64 platforms for the WebAssembly i8x16.select
instruction which will produce the wrong results when the same operand is provided to the instruction and some of the selected indices are greater than 16. There is an off-by-one error in the calculation of the mask to the pshufb
instruction which causes incorrect results to be returned if lanes are selected from the second vector. This codegen bug has been fixed in Wasmtiem 6.0.1, 5.0.1, and 4.0.1. Users are recommended to upgrade to these updated versions. If upgrading is not an option for you at this time, you can avoid this miscompilation by disabling the Wasm simd proposal. Additionally the bug is only present on x86_64 hosts. Other platforms such as AArch64 and s390x are not affected.
docs.rs/wasmtime/latest/wasmtime/struct.Config.html#method.wasm_simd
github.com/bytecodealliance/wasmtime/commit/5dc2bbccbb363e474d2c9a1b8e38a89a43bbd5d1
github.com/bytecodealliance/wasmtime/security/advisories/GHSA-xm67-587q-r2vw
github.com/webassembly/simd
groups.google.com/a/bytecodealliance.org/g/sec-announce/c/Mov-ItrNJsQ
4.3 Medium
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
LOW
Availability Impact
NONE
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N
5.1 Medium
AI Score
Confidence
High
0.002 Low
EPSS
Percentile
52.8%