An issue was discovered in the smallvec crate before 0.6.10 for Rust. There is a double free for certain grow attempts with the current capacity.
CVE-2019-15551
CRITICALNVD 9.89.8—
EchelonGraph scoreMEDIUM confidence
This critical-severity CVE scores 9.8 under NVD CVSS v3. EPSS exploit probability: 0.4%, top 38% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).
Triggered by: NVD CVSS baseline
Sources: epss, nvd
9.8
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
- High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 2%CVSS: 9.8Exploit: NoneExposed: 0
No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.
- CVSS v3
- 9.8
- EG Score
- 9.8(medium)
- EPSS
- 76.8%
- KEV
- Not listed
Published
August 26, 2019
Last Modified
November 21, 2024
Advisory Details (2)
Auto-updated May 29, 2026⚠️ Active exploitation confirmed. No patch confirmed yet.
generic
RUSTSEC-2019-0009: smallvec: Double-free and use-after-free in SmallVec::grow() › RustSec Advisory Database
https://rustsec.org/advisories/RUSTSEC-2019-0009.htmlgeneric🔴 Active Exploitation
use-after-free when growing to the same size · Issue #148 · servo/rust-smallvec · GitHub
https://github.com/servo/rust-smallvec/issues/148Affected Packages
(1 across 1 ecosystem)
crates.io(1)
| Package | Vulnerable range | Fixed in | Dependents |
|---|---|---|---|
| smallvec | — | 0.6.10 | — |
Weakness Classification(1)
MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.
Frequently asked(5)
What is CVE-2019-15551?
CVE-2019-15551 is a critical vulnerability published on August 26, 2019. An issue was discovered in the smallvec crate before 0.6.10 for Rust. There is a double free for certain grow attempts with the current capacity.
When was CVE-2019-15551 disclosed?
CVE-2019-15551 was first published in the National Vulnerability Database on August 26, 2019, with the most recent update on November 21, 2024. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2019-15551 actively exploited?
CVE-2019-15551 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 76.8% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2019-15551?
CVE-2019-15551 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2019-15551?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2019-15551, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.
Dependency Blast Radius
See which npm, PyPI, Go, and Maven packages are affected by CVE-2019-15551
Is Your Infrastructure Affected by CVE-2019-15551?
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