How severe is CVE-2026-7598?

CVE-2026-7598 has a CVSS 3.x base score of 7.3, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity low, and availability low.

Is CVE-2026-7598 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (37th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-7598?

CVE-2026-7598 affects Libssh2. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-7598?

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-2026-7598 have an EU (EUVD) identifier?

Yes. CVE-2026-7598 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-26722.

When was CVE-2026-7598 published?

CVE-2026-7598 was published on 2026-05-01 and last updated on 2026-06-30.

CVE-2026-7598

CVE-2026-7598 is a high-severity vulnerability in Libssh2 with a CVSS 3.x base score of 7.3. 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-189.

Key facts

Severity: High (CVSS 3.x base score 7.3)
CVSS v2: 7.5
CVSS v4: 6.9
EPSS exploit prediction: 0% (37th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-26722
Weakness: CWE-189
Affected product: Libssh2
Published: 2026-05-01
Last modified: 2026-06-30

Description

A security vulnerability has been detected in libssh2 up to 1.11.1. The impacted element is the function userauth_password of the file src/userauth.c. Such manipulation of the argument username_len/password_len leads to integer overflow. The attack may be launched remotely. The name of the patch is 256d04b60d80bf1190e96b0ad1e91b2174d744b1. A patch should be applied to remediate this issue.

Frequently asked questions

What is CVE-2026-7598?: A security vulnerability has been detected in libssh2 up to 1.11.1. The impacted element is the function userauth_password of the file src/userauth.c. Such manipulation of the argument username_len/password_len leads to integer overflow. The attack may be launched remotely. The name of the patch is 256d04b60d80bf1190e96b0ad1e91b2174d744b1. A patch should be applied to remediate this issue.
How severe is CVE-2026-7598?: CVE-2026-7598 has a CVSS 3.x base score of 7.3, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity low, and availability low.
Is CVE-2026-7598 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (37th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-7598?: CVE-2026-7598 affects Libssh2. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-7598?: 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-2026-7598 have an EU (EUVD) identifier?: Yes. CVE-2026-7598 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-26722.
When was CVE-2026-7598 published?: CVE-2026-7598 was published on 2026-05-01 and last updated on 2026-06-30.

References

Affected products (1)

cpe:2.3:a:libssh2:libssh2:*:*:*:*:*:*:*:*

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