[UPDATE] [medium] libssh2: Vulnerability allows Denial of Service

mediumCVE-2026-7598

A remote, anonymous attacker can exploit a vulnerability in libssh2 to perform a Denial of Service attack.

CSIRTS triage

vendor: libssh2 product: libssh2 Denial of service

What: libssh2 contains a vulnerability allowing remote denial of service attacks.
Who is affected: All deployments of libssh2 are affected.
Urgency: Medium priority; remote unauthenticated DoS possible.
Action: Update libssh2 to a patched version addressing CVE-2026-7598.

AI-assisted analysis generated from the source advisory — verify against the original.

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Details

Source: CERT-Bund (BSI) Security Advisories (DE · national-cert · site)
Severity: medium
Published: 2026-08-25
Exploitation: Not in CISA KEV at last sync
Language: Machine-translated to English — verify against the original

Original advisory: https://wid.cert-bund.de/portal/wid/securityadvisory?name=WID-SEC-2026-1332

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Low exploitation riskCVE-2026-75980.47% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 39% of all EPSS-scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2026-7598	coverage & exploitation status	NVD · CVE.org

Same CVEs, other sources

How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.

unknownDSA-6365-1 libssh2 - security updatedebian

Recent advisories for libssh2

A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.

high[NEW] [high] libssh2: Multiple vulnerabilitiescert-bund · 2026-08-25
medium[UPDATE] [medium] libssh2: Multiple vulnerabilitiescert-bund · 2026-08-25
medium[UPDATE] [medium] libssh2: Vulnerability allows Denial of Service and disclosure of informationcert-bund · 2026-08-25
high[UPDATE] [high] libssh2: Multiple vulnerabilitiescert-bund · 2026-08-25
criticalCVE-2026-5917: libgit2 versions v0.27.0 through v1.9.0 built with the libssh2 SSH backend (USE_SSH=libssh2) co…nvd · 2026-08-11
highCVE-2026-66034: libssh2 Heap Out-of-Bounds Read via publickey subsystemmsrc · 2026-08-06