How severe is CVE-2026-38639?

CVE-2026-38639 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-2026-38639 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-2026-38639?

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.

When was CVE-2026-38639 published?

CVE-2026-38639 was published on 2026-06-26 and last updated on 2026-06-29.

CVE-2026-38639

CVE-2026-38639 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-20.

Key facts

Severity: High (CVSS 3.x base score 7.5)
EPSS exploit prediction: 0% (36th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-20
Published: 2026-06-26
Last modified: 2026-06-29

Description

An issue in the parse_month function (/time/strptime.rs) of relibc commit ab6a2e allows attackers to cause a Denial of Service (DoS) via parsing a crafted input.

Frequently asked questions

What is CVE-2026-38639?: An issue in the parse_month function (/time/strptime.rs) of relibc commit ab6a2e allows attackers to cause a Denial of Service (DoS) via parsing a crafted input.
How severe is CVE-2026-38639?: CVE-2026-38639 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-2026-38639 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-2026-38639?: 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.
When was CVE-2026-38639 published?: CVE-2026-38639 was published on 2026-06-26 and last updated on 2026-06-29.

References

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