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MEDIUM severity

CVE-2017-18588 — security-framework

MEDIUMFix: sfackler/rust-security-framework#27

CVE-2017-18588 is a medium-severity (CVSS 5.3) CWE-295 vulnerability in security-framework. A fix is available for security-framework — see the affected versions and patch details below.

Improper Certificate Validation in security-framework

Also known asGHSA-jqqr-c2r2-9cvrRUSTSEC-2017-0003
Published
Updated
Affected
1 pkg
Patched
1 / 1
Exploits
None indexed
Exploitation data as of Oct 10, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗
0.7%probability of exploitation in next 30 days
Lower Risk0.00%
Lower risk than most CVEs50th percentile — riskier than 50% of all scored CVEsHighest risk
0.00%0.38%0.77%1.15%0.1%0.7%Apr 26Aug 26Oct 26

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

How urgent is this, really

CVE-2017-18588 by exploitation likelihood (EPSS) against impact (CVSS). Outside the shaded patch-first corner.

Where this sits among everything scored

Of 385,987 CVEs with a current EPSS score, this one falls in the < 10% band (highlighted). Counts from FIRST.org, log-scaled.

Real-World Exposure

1 pkg affected
🦀security-framework

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects crates.io packages — download data is not available via public APIs for these ecosystems.

Description

If custom root certificates were registered with a ClientBuilder, the hostname of the target server would not be validated against its presented leaf certificate. This issue was fixed by properly configuring the trust evaluation logic to perform that check.

Affected Packages

1 total 1 fixed
EcosystemPackageVulnerable rangeFix
🦀crates.iosecurity-frameworkall versions0.1.12cargo update -p security-framework --precise 0.1.12

Affected Products

1 product · 1 configurations
Application
security-frameworksecurity-framework_project
< 0.1.12
range

Detection & mitigation playbook

Open-source dependency

  1. Detect

    Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for security-framework, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

  2. Fix

    Update security-framework to 0.1.12 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2017-18588 is resolved across your whole dependency graph.

  3. Workarounds

    If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.

Frequently Asked Questions

If custom root certificates were registered with a ClientBuilder, the hostname of the target server would not be validated against its presented leaf certificate. This issue was fixed by properly configuring the trust evaluation logic to perform that check.
O3 Security · Impact-Aware SCA

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CVE-2017-18588: security-framework — Fixed in 0.1.12