[UPDATE] [medium] libssh2: Multiple vulnerabilities
A remote, anonymous attacker can exploit multiple vulnerabilities in libssh2 to manipulate files, cause memory corruption, trigger a denial-of-service condition, or achieve other unspecified impacts.
CSIRTS triage
- What
- Multiple vulnerabilities in libssh2 can be exploited by a remote, anonymous attacker to manipulate files, cause memory corruption, or trigger a denial-of-service condition.
- Who is affected
- Remote, anonymous attackers can exploit these vulnerabilities in affected versions of libssh2.
- Urgency
- Remediation is medium urgency due to the potential for memory corruption and denial of service.
- Action
- Update libssh2 to the latest version.
AI-assisted analysis generated from the source advisory — verify against the original.
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Details
Original advisory: https://wid.cert-bund.de/portal/wid/securityadvisory?name=WID-SEC-2026-2099
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-2026-580500.36% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 29% of all scored CVEs.
- Low exploitation riskCVE-2026-580510.28% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 20% of all scored CVEs.
Referenced CVEs
| CVE | CSIRTS overview | External |
|---|---|---|
| CVE-2026-58050 | coverage & exploitation status | NVD · CVE.org |
| CVE-2026-58051 | coverage & exploitation status | NVD · CVE.org |
Same CVEs, other sources
How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.
- unknownUSN-8532-1: libssh2 vulnerabilitiesubuntu
- mediumCVE-2026-58051: libssh2 through 1.11.1 grows its publickey list with SSH2_REALLOC but does not zero-initialize…nvd
- highCVE-2026-58050: libssh2 through 1.11.1 reads an attacker-controlled 32-bit attribute count from a publickey-su…nvd
- mediumCVE-2026-58051: libssh2 - Free of Uninitialized Pointer in publickey List Cleanupmsrc
- highCVE-2026-58050: libssh2 - Integer Overflow in publickey Subsystem Attribute Allocationmsrc
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 · 2026-07-28
- highCVE-2026-66035: libssh2 through 1.11.1, fixed in commit 42e33d8, contains a pre-authentication heap buffer ove…nvd · 2026-07-24
- highCVE-2026-66034: libssh2 through 1.11.1, fixed in commit a13bb6c, contains a missing bounds check vulnerability…nvd · 2026-07-24
- highCVE-2026-66033: libssh2 through 1.11.1, fixed in commit a2ed82d, contains a pre-authentication integer underfl…nvd · 2026-07-24
- highCVE-2026-66032: libssh2 through 1.11.1, fixed in commit 5e47761, contains a double-free vulnerability in the s…nvd · 2026-07-24
- high[UPDATE] [high] libssh2: Multiple vulnerabilitiescert-bund · 2026-07-17
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