How severe is CVE-2026-40530?

CVE-2026-40530 has a CVSS 3.x base score of 8.0, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2026-40530 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (40th percentile), an estimate of the probability of exploitation in the next 30 days.

How do I fix CVE-2026-40530?

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-2026-40530 published?

CVE-2026-40530 was published on 2026-09-18.

CVE-2026-40530

CVE-2026-40530 is a high-severity vulnerability with a CVSS 3.x base score of 8.0. 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-93.

Key facts

Severity: High (CVSS 3.x base score 8.0)
EPSS exploit prediction: 0% (40th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-93
Published: 2026-09-18
Last modified: 2026-09-18

Description

An improper neutralization of CRLF sequences ('CRLF injection') vulnerability in User API in Synology DiskStation Manager (DSM) before 7.2.1-69057-10, 7.2.2-72806-7 and 7.3.2-86009-2 allows remote authenticated users to read or write arbitrary files and conduct denial-of-service attacks after the system is rebooted.

Frequently asked questions

What is CVE-2026-40530?: An improper neutralization of CRLF sequences ('CRLF injection') vulnerability in User API in Synology DiskStation Manager (DSM) before 7.2.1-69057-10, 7.2.2-72806-7 and 7.3.2-86009-2 allows remote authenticated users to read or write arbitrary files and conduct denial-of-service attacks after the system is rebooted.
How severe is CVE-2026-40530?: CVE-2026-40530 has a CVSS 3.x base score of 8.0, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2026-40530 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (40th percentile), an estimate of the probability of exploitation in the next 30 days.
How do I fix CVE-2026-40530?: 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-2026-40530 published?: CVE-2026-40530 was published on 2026-09-18.

References

https://www.synology.com/en-global/security/advisory/Synology_SA_26_06

Other CWE-93 (CRLF Injection) vulnerabilities

CVE-2026-77550 — Critical (CVSS 10.0): A malicious actor with access to the network could exploit an Improper Neutralization of CRLF Sequences vulnerability…
CVE-2024-51501 — Critical (CVSS 10.0): Refit is an automatic type-safe REST library for .NET Core, Xamarin and .NET The various header-related Refit…
CVE-2026-100717 — Critical (CVSS 9.9): froxlor is a server administration panel. In versions 2.3.10 and earlier, Validate::validateUrl rejects carriage return…
CVE-2026-90937 — Critical (CVSS 9.9): froxlor versions before 2.2.5 fail to validate newline characters in subdomain redirect URLs, allowing authenticated…
CVE-2026-70615 — Critical (CVSS 9.9): boringproxy through 0.10.0 contains a newline injection vulnerability that allows authenticated low-privileged users…
CVE-2026-45372 — Critical (CVSS 9.9): cpp-httplib is a C++11 single-file header-only cross platform HTTP/HTTPS library. Prior to 0.44.0, when cpp-httplib's…

Browse all CWE-93 (CRLF Injection) vulnerabilities →