advisory-db/crates/stackvector/RUSTSEC-2021-0048.md

[advisory]
id = "RUSTSEC-2021-0048"
package = "stackvector"
aliases = ["CVE-2021-29939"]
date = "2021-02-19"
url = "https://github.com/Alexhuszagh/rust-stackvector/issues/2"
categories = ["memory-corruption"]

[versions]
patched = [">= 1.0.9"]

StackVec::extend can write out of bounds when size_hint is incorrect

StackVec::extend used the lower and upper bounds from an Iterator's size_hint to determine how many items to push into the stack based vector.

If the size_hint implementation returned a lower bound that was larger than the upper bound, StackVec would write out of bounds and overwrite memory on the stack. As mentioned by the size_hint documentation, size_hint is mainly for optimization and incorrect implementations should not lead to memory safety issues.