How severe is CVE-2026-38967?

CVE-2026-38967 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-2026-38967 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (25th percentile), an estimate of the probability of exploitation in the next 30 days.

How do I fix CVE-2026-38967?

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.

Does CVE-2026-38967 have an EU (EUVD) identifier?

Yes. CVE-2026-38967 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-34020.

When was CVE-2026-38967 published?

CVE-2026-38967 was published on 2026-06-02 and last updated on 2026-06-17.

CVE-2026-38967

CVE-2026-38967 is a critical-severity vulnerability 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-113.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
EPSS exploit prediction: 0% (25th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-34020
Weakness: CWE-113
Published: 2026-06-02
Last modified: 2026-06-17

Description

CrowCpp Crow through v1.3.1 HTTP is vulnerable to response header injection via unvalidated response header values.

Frequently asked questions

What is CVE-2026-38967?: CrowCpp Crow through v1.3.1 HTTP is vulnerable to response header injection via unvalidated response header values.
How severe is CVE-2026-38967?: CVE-2026-38967 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-2026-38967 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (25th percentile), an estimate of the probability of exploitation in the next 30 days.
How do I fix CVE-2026-38967?: 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.
Does CVE-2026-38967 have an EU (EUVD) identifier?: Yes. CVE-2026-38967 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-34020.
When was CVE-2026-38967 published?: CVE-2026-38967 was published on 2026-06-02 and last updated on 2026-06-17.

References

Other CWE-113 (HTTP Response Splitting) vulnerabilities

CVE-2026-34520 — Critical (CVSS 9.1): AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. Prior to version 3.13.4, the C parser…
CVE-2025-53007 — High (CVSS 8.9): arduino-esp32 provides an Arduino core for the ESP32. Versions prior to 3.3.0-RC1 and 3.2.1 contain a HTTP Response…
CVE-2024-52875 — High (CVSS 8.8): An issue was discovered in GFI Kerio Control 9.2.5 through 9.4.5. The dest GET parameter passed to the…
CVE-2018-0689 — High (CVSS 8.8): HTTP header injection vulnerability in SEIKO EPSON printers and scanners (DS-570W firmware versions released prior to…
CVE-2018-11347 — High (CVSS 8.8): The YunoHost 2.7.2 through 2.7.14 web application is affected by one HTTP Response Header Injection. This flaw allows…
CVE-2025-61689 — High (CVSS 8.7): HTTP.jl is an HTTP client and server functionality for the Julia programming language. Prior to version 1.10.19,…

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