CVE-2020-36317

Severity: high (CVSS 7.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.5% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2021-04-11 · updated 2026-06-17
Weakness: CWE-787

Description

In the standard library in Rust before 1.49.0, String::retain() function has a panic safety problem. It allows creation of a non-UTF-8 Rust string when the provided closure panics. This bug could result in a memory safety violation when other string APIs assume that UTF-8 encoding is used on the same string.

Affected products

rust-lang rust: before 1.49.0 — fixed in 1.49.0

How to fix

Upgrade to a fixed version: rust-lang rust 1.49.0. Check the vendor advisory for mitigations.

References

https://github.com/rust-lang/rust/issues/78498
https://github.com/rust-lang/rust/pull/78499
https://github.com/rust-lang/rust/issues/78498
https://github.com/rust-lang/rust/pull/78499

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