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Vulnerabilities

Vulnerability · CVE-2026-58050

libssh2 through 1.11.1 reads an attacker-controlled 32-bit attribute count from a publickey-subsystem response and uses it in the allocation num_attrs * sizeof(libssh2_publickey_at

Published Jun 28, 2026 · catalog updated Oct 21, 2026 · libssh2 through 1.11.1 reads

Last checked Oct 29, 2026. A connected source was read within the last 7 days.

Check if you run it

No confirmed exploitation is on record for CVE-2026-58050. EPSS is 0.44%. Act only if a listed version of libssh2 through 1.11.1 reads is installed.

Gaps on this record

  • The stored product name is a package slug. The name on this page is taken from the title (libssh2 through 1.11.1 reads).
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
High7.5
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.44%
Remediation
Advisory link
Affected products
Alpine:v3.21 libssh2 · Alpine:v3.22 libssh2 · Alpine:v3.23 libssh2 · Alpine:v3.24 libssh2

libssh2 through 1.11.1 reads an attacker-controlled 32-bit attribute count from a publickey-subsystem response and uses it in the allocation num_attrs * sizeof(libssh2_publickey_attribute) without bounds checking, so on 32-bit platforms the multiplication overflows to an undersized buffer. A malicious SSH server can then drive the attribute-parsing loop to write past the allocation, causing a heap buffer overflow in a connecting libssh2 client.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • Alpine:v3.21 libssh20 → 1.11.1-r3
  • Alpine:v3.22 libssh20 → 1.11.1-r3
  • Alpine:v3.23 libssh20 → 1.11.1-r4
  • Alpine:v3.24 libssh20 → 1.11.1-r4

How to fix CVE-2026-58050

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2026-58050. EPSS is 0.44%. Act only if a listed version of libssh2 through 1.11.1 reads is installed.

Which versions are affected?

Compare what you have installed with 0 → 1.11.1-r3, 0 → 1.11.1-r4. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

No weakness class is stored. EPSS 0.44%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. Jun 28, 2026 · OpenSSF OSV / OSV Scanner

    Detected

    libssh2 through 1.11.1 reads an attacker-controlled 32-bit attribute count from a publickey-subsystem response and uses it in the allocation num_attrs * sizeof(libssh2_publickey_attribute) without bounds checking, so on 32-bit platforms the multiplication overflows to an undersized buffer. A malicious SSH server can then drive the attribute-parsing loop to write past the allocation, causing a heap

  2. Oct 20, 2026 · OpenSSF OSV / OSV Scanner

    Fix available

    libssh2 fixed in 1.11.1-r4

  3. Oct 20, 2026 · OpenSSF OSV / OSV Scanner

    Fix available

    libssh2 fixed in 1.11.1-r4

  4. Oct 20, 2026 · OpenSSF OSV / OSV Scanner

    Updated

    libssh2 through 1.11.1 reads an attacker-controlled 32-bit attribute count from a publickey-subsystem response and uses it in the allocation num_attrs * sizeof(libssh2_publickey_attribute) without bounds checking, so on 32-bit platforms the multiplication overflows to an undersized buffer. A malicious SSH server can then drive the attribute-parsing loop to write past the allocation, causing a heap

  5. Oct 21, 2026 · OpenSSF OSV / OSV Scanner

    Fix available

    libssh2 fixed in 1.11.1-r3; libssh2 fixed in 1.11.1-r3; libssh2 fixed in 1.11.1-r4; libssh2 fixed in 1.11.1-r4

  6. Oct 21, 2026 · OpenSSF OSV / OSV Scanner

    Fix available

    libssh2 fixed in 1.11.1-r3

  7. Oct 21, 2026 · OpenSSF OSV / OSV Scanner

    Updated

    libssh2 through 1.11.1 reads an attacker-controlled 32-bit attribute count from a publickey-subsystem response and uses it in the allocation num_attrs * sizeof(libssh2_publickey_attribute) without bounds checking, so on 32-bit platforms the multiplication overflows to an undersized buffer. A malicious SSH server can then drive the attribute-parsing loop to write past the allocation, causing a heap

Sources

  • CVE.orgVulnerability recordCVE-2026-58050

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2026-58050

    30-day exploitation probability 0.44%

    first.org
  • OpenSSF OSV / OSV ScannerPackage advisoryALPINE-CVE-2026-58050
    osv.dev
  • Trivy Vulnerability DBPackage advisoryALPINE-CVE-2026-58050

    libssh2 through 1.11.1 reads an attacker-controlled 32-bit attribute count from a publickey-subsystem response and uses it in the allocation num_attrs * sizeof(libssh2_publickey_attribute) without bounds checking, so on 32-bit platforms the multiplication overflows to an undersiz

    osv.dev

References

Freshness

Last verified in this catalog Oct 29, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.

  • Trivy Vulnerability DBOct 23, 2026
  • OpenSSF OSV / OSV ScannerOct 23, 2026
  • FIRST EPSSOct 23, 2026
  • CVE.orgOct 21, 2026