CVE-2026-15370: A flaw was found in libssh. During SFTP server directory listing, the longname field is constructed with unsafe concatenation into a fixed-size stack buffer. When a client causes t

mediumCVSS 6.7CVE-2026-15370

A flaw was found in libssh. During SFTP server directory listing, the longname field is constructed with unsafe concatenation into a fixed-size stack buffer. When a client causes the server to list attacker-controlled filenames, sufficiently long names can overflow that stack buffer and may lead to crashes or possible code execution on the server.

Details

Source: NVD Recent CVEs (US · database · site)
Severity: medium — CVSS 6.7
Published: 2026-07-21
Last updated: 2026-07-22
Exploitation: Not in CISA KEV at last sync

Original advisory: https://nvd.nist.gov/vuln/detail/CVE-2026-15370

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-2026-153700.16% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 5% of all scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2026-15370	coverage & exploitation status	NVD · CVE.org

Same CVEs, other sources

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

high[NEW] [high] libssh: Multiple vulnerabilitiescert-bund

Recent advisories for libssh. During SFTP

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.

mediumCVE-2026-59848: A flaw was found in libssh. A malicious SFTP server can send responses for unknown request IDs…nvd · 2026-07-21
mediumCVE-2026-59844: A flaw was found in libssh. A remote authenticated client can issue SSH_FXP_READ requests with…nvd · 2026-07-21
mediumCVE-2026-59848: Libssh: libssh: denial of service via sftp responses with unknown request idsmsrc · 2026-07-14
mediumCVE-2026-59844: Libssh: libssh: denial of service via oversized sftp read lengthmsrc · 2026-07-14