How severe is CVE-2019-16140?

CVE-2019-16140 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2019-16140 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (73rd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2019-16140?

CVE-2019-16140 affects Isahc Project Isahc. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2019-16140?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

When was CVE-2019-16140 published?

CVE-2019-16140 was published on 2019-09-09 and last updated on 2026-06-17.

CVE-2019-16140

CVE-2019-16140 is a critical-severity vulnerability in Isahc Project Isahc with a CVSS 3.x base score of 9.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-416.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
CVSS v2: 7.5
EPSS exploit prediction: 2% (73rd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-416
Affected product: Isahc Project Isahc
Published: 2019-09-09
Last modified: 2026-06-17

Description

An issue was discovered in the chttp crate before 0.1.3 for Rust. There is a use-after-free during buffer conversion.

Frequently asked questions

What is CVE-2019-16140?: An issue was discovered in the chttp crate before 0.1.3 for Rust. There is a use-after-free during buffer conversion.
How severe is CVE-2019-16140?: CVE-2019-16140 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2019-16140 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (73rd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2019-16140?: CVE-2019-16140 affects Isahc Project Isahc. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2019-16140?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
When was CVE-2019-16140 published?: CVE-2019-16140 was published on 2019-09-09 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:isahc_project:isahc:0.1.2:*:*:*:*:*:*:*

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