CVE-2020-35858: An issue was discovered in the prost crate before 0.6.1 for Rust

Q: How do I fix CVE-2020-35858?

prost: upgrade to 0.6.1. Exact commands for each OS are on this page.

Q: Is CVE-2020-35858 being exploited?

CVE-2020-35858 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2020-35858 affect?

CVE-2020-35858 affects prost. Severity is critical (CVSS 9.8). An issue was discovered in the prost crate before 0.6.1 for Rust. There is stack consumption via a crafted message, causing a denial of service (e.g., x86) or possibly remote code execution (e.g., ARM).

Q: How urgent is CVE-2020-35858?

Priority 67/100. Critical severity; Public exploit reference; Remotely exploitable, no login, no user action

This week

CRITICAL 9.8REMOTEUPGRADE

CVE-2020-35858 is a critical-severity flaw (CVSS 9.8) affecting prost. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

An issue was discovered in the prost crate before 0.6.1 for Rust. There is stack consumption via a crafted message, causing a denial of service (e.g., x86) or possibly remote code execution (e.g., ARM).

Why this priority

Critical severity
Public exploit reference
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	3.4% (top 11%)
CISA exploited list	No
Weakness	CWE-787
Published	2020-12-31
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: prost project

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

Am I affected?

Timeline

2020-12-31 10:15 UTCPublished CVE record published
2026-06-17 03:14 UTCUpdated Record last modified

prost project prost UPGRADE

Affected: < 0.6.1

Fixed in: 0.6.1

Safe to downgrade to: no unaffected older release

1. Check installed version

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

2. UPGRADE to 0.6.1 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade prost

Note

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

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-2020-35858?

prost: upgrade to 0.6.1. Exact commands for each OS are on this page.

Is CVE-2020-35858 being exploited?

CVE-2020-35858 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-2020-35858 affect?

CVE-2020-35858 affects prost. Severity is critical (CVSS 9.8). An issue was discovered in the prost crate before 0.6.1 for Rust. There is stack consumption via a crafted message, causing a denial of service (e.g., x86) or possibly remote code execution (e.g., ARM).

How urgent is CVE-2020-35858?

Priority 67/100. Critical severity; Public exploit reference; Remotely exploitable, no login, no user action

Related CVEs

CVE-2021-38192 HIGH 7.5 UPGRADE An issue was discovered in the prost-types crate before 0.8.0 for Rust

References

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