PatchTheCVECVE-2020-36458: An issue was discovered in the lexer crate through 2020-11-10 for Rust
CVE-2020-36458 is a high-severity flaw (CVSS 8.1) affecting lexer. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.
An issue was discovered in the lexer crate through 2020-11-10 for Rust. For ReaderResult<T, E>, there is an implementation of Sync with a trait bound of T: Send, E: Send.
Why this priority
- High severity
- Public exploit reference
- Remotely exploitable, no login, no user action
A fixed release or distro patch exists.
Risk facts
| CVSS score | 8.1 (High) |
| Attack vector | Network (remote) |
| Attack complexity | High |
| Privileges needed | None |
| User interaction | None |
| EPSS exploit chance | 0.8% (top 42%) |
| CISA exploited list | No |
| Weakness | CWE-362 |
| Published | 2021-08-08 |
| Last modified | 2026-06-17 |
Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score
Am I affected?
Timeline
- Published CVE record published
- Updated Record last modified
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.
Quick answers
How do I fix CVE-2020-36458?
lexer: upgrade to newer than 2020-11-10. Exact commands for each OS are on this page.
Is CVE-2020-36458 being exploited?
CVE-2020-36458 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.
What does CVE-2020-36458 affect?
CVE-2020-36458 affects lexer. Severity is high (CVSS 8.1). An issue was discovered in the lexer crate through 2020-11-10 for Rust. For ReaderResult<T, E>, there is an implementation of Sync with a trait bound of T: Send, E: Send.
How urgent is CVE-2020-36458?
Priority 53/100. High severity; Public exploit reference; Remotely exploitable, no login, no user action