How severe is CVE-2026-38640?

CVE-2026-38640 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2026-38640 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (36th percentile), an estimate of the probability of exploitation in the next 30 days.

How do I fix CVE-2026-38640?

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

Does CVE-2026-38640 have an EU (EUVD) identifier?

Yes. CVE-2026-38640 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-39622.

When was CVE-2026-38640 published?

CVE-2026-38640 was published on 2026-06-25 and last updated on 2026-06-26.

CVE-2026-38640

CVE-2026-38640 is a high-severity vulnerability with a CVSS 3.x base score of 7.5. 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-400.

Key facts

Severity: High (CVSS 3.x base score 7.5)
EPSS exploit prediction: 0% (36th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-39622
Weakness: CWE-400
Published: 2026-06-25
Last modified: 2026-06-26

Description

A reachable unwrap in the __assert_fail function (/assert/mod.rs) of relibc commit 61f42d allows attackers to cause a Denial of Service (DoS) via a crafted string.

Frequently asked questions

What is CVE-2026-38640?: A reachable unwrap in the __assert_fail function (/assert/mod.rs) of relibc commit 61f42d allows attackers to cause a Denial of Service (DoS) via a crafted string.
How severe is CVE-2026-38640?: CVE-2026-38640 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2026-38640 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (36th percentile), an estimate of the probability of exploitation in the next 30 days.
How do I fix CVE-2026-38640?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2026-38640 have an EU (EUVD) identifier?: Yes. CVE-2026-38640 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-39622.
When was CVE-2026-38640 published?: CVE-2026-38640 was published on 2026-06-25 and last updated on 2026-06-26.

References

EU advisories (EUVD)

https://nvd.nist.gov/vuln/detail/CVE-2026-38640

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