CVE-2023-40030: Cargo downloads a Rust project’s dependencies and compiles the project

Routine

MEDIUM 6.1UPGRADE

CVE-2023-40030 is a medium-severity flaw (CVSS 6.1) affecting rust. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Cargo downloads a Rust project’s dependencies and compiles the project. Starting in Rust 1.60.0 and prior to 1.72, Cargo did not escape Cargo feature names when including them in the report generated by `cargo build --timings`. A malicious package included as a dependency may inject nearly arbitrary HTML here, potentially leading to cross-site scripting if the report is subsequently uploaded somewhere. The vulnerability affects users relying on d

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	6.1 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.9% (top 41%)
CISA exploited list	No
Weakness	CWE-79
Published	2023-08-24
Last modified	2026-06-17

Publisher (CNA): GitHub, Inc. · Vendor: rust-lang

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2023-08-24 23:15 UTCPublished CVE record published
2026-06-17 06:15 UTCUpdated Record last modified

rust-lang rust UPGRADE

Affected: >= 1.60.0 and < 1.72.0

Fixed in: 1.72.0

Safe to downgrade to: a release before 1.60.0

1. Check installed version

apt-cache policy rust || rpm -q rust || rust --version

2. UPGRADE to 1.72.0 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade rust

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade rust

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

3. If no update is available yet, DOWNGRADE to a release before 1.60.0 (Debian / Ubuntu)

apt-cache madison rust sudo apt install rust=<VERSION_BEFORE_1.60.0> sudo apt-mark hold rust

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list rust sudo dnf downgrade rust-<VERSION_BEFORE_1.60.0> sudo dnf versionlock add rust

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
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-2023-40030?

rust: upgrade to 1.72.0. Exact commands for each OS are on this page.

Is CVE-2023-40030 being exploited?

CVE-2023-40030 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-2023-40030 affect?

CVE-2023-40030 affects rust. Severity is medium (CVSS 6.1). Cargo downloads a Rust project’s dependencies and compiles the project. Starting in Rust 1.60.0 and prior to 1.72, Cargo did not escape Cargo feature names when including them in the report generated by `cargo build --timings`. A malicious

How urgent is CVE-2023-40030?

Priority 36/100. No elevated risk signals yet.

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References

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