In the standard library in Rust before 1.52.0, there is an optimization for joining…
Priority MEDIUM 40CWE-134Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- —
- Confidentiality · integrity · availability
- Low · None · High
- Fix status
- Fixed
Attack profile from CVSS 3.1 · NVD. Fix status from CNA and Red Hat.
Summary
In the standard library in Rust before 1.52.0, there is an optimization for joining strings that can cause uninitialized bytes to be exposed (or the program to crash) if the borrowed string changes after its length is checked.
Why it matters now
EPSS 0.02025 81st percentileScored 2026-11-07
Fix Fixed Red Hat: 2 advisories
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| — | — | all versions | — | No fix listed | CNA |
- — Vendor— Affected all versions Fixed in — No fix listed CNA
CPE configurations NVD · 4
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:rust-lang:rust:*:*:*:*:*:*:*:* | before 1.52.0 | Vulnerable | rust-lang |
| cpe:2.3:o:fedoraproject:fedora:32:*:*:*:*:*:*:* | 32 | Vulnerable | Fedoraproject |
| cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:* | 33 | Vulnerable | Fedoraproject |
| cpe:2.3:o:fedoraproject:fedora:34:*:*:*:*:*:*:* | 34 | Vulnerable | Fedoraproject |
- cpe:2.3:a:rust-lang:rust:*:*:*:*:*:*:*:* Versions before 1.52.0 Vulnerable ·rust-lang
- cpe:2.3:o:fedoraproject:fedora:32:*:*:*:*:*:*:* Versions 32 Vulnerable ·Fedoraproject
- cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:* Versions 33 Vulnerable ·Fedoraproject
- cpe:2.3:o:fedoraproject:fedora:34:*:*:*:*:*:*:* Versions 34 Vulnerable ·Fedoraproject
Remediation
Red Hat 2 advisories
- RHSA-2021:3063 Released 2021-08-10 · Red Hat rating Moderaterust-toolset:rhel8 security, bug fix, and enhancement update
- Red Hat Enterprise Linux AppStream (v. 8) cargo-1.52.1-1.module+el8.4.0+11282+0729bac9.aarch64::rust-toolset:rhel8, cargo-1.52.1-1.module+el8.4.0+11282+0729bac9.ppc64le::rust-toolset:rhel8, cargo-1.52.1-1.module+el8.4.0+11282+0729bac9.s390x::rust-toolset:rhel8 +40
- RHSA-2021:3042 Released 2021-08-10 · Red Hat rating Moderaterust-toolset-1.52 and rust-toolset-1.52-rust security and enhancement update
- Red Hat Developer Tools for Red Hat Enterprise Linux Server (v. 7) rust-toolset-1.52-1.52.1-1.el7_9, rust-toolset-1.52-build-1.52.1-1.el7_9, rust-toolset-1.52-cargo-1.52.1-2.el7_9 +13
Vendor assessments
Red Hat
Red Hat rating: Moderate. Red Hat's page for this CVE →
| Product | Status | Plan or fix |
|---|---|---|
| Red Hat Developer Tools for Red Hat Enterprise Linux Server (v. 7) | Fixed | RHSA-2021:3042 |
| Red Hat Enterprise Linux AppStream (v. 8) | Fixed | RHSA-2021:3063 |
Not affected: 1 product
- Red Hat Enterprise Linux 9
Timeline
- 2026-10-02 Threatist record created from CVE-2020-36323
- 2026-10-03 Alias added: GHSA-9v8g-q8xx-7374
References
Patch 4
Sources
- CVE-2020-36323 · CVE Program
- CVE-2020-36323 · NVD
- FIRST EPSS
- GHSA-9v8g-q8xx-7374 · GitHub Advisory Database · CC BY 4.0
- CVE-2020-36323 · Red Hat security data · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences