Read the docs
TI-2026-06681 Aliases CVE-2026-7598GHSA-jhp3-h4hp-2c3p

libssh2 userauth.c userauth_password integer overflow

Priority HIGH 70CWE-189Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Attack requirements
None
Impact type
—
Confidentiality · integrity · availability
Low · Low · Low
Fix status
Partial Red Hat: 3 fixed, 2 without a fix

Attack profile from CVSS 4.0 · CNA. Fix status from CNA and Red Hat.

Summary

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.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00466 40th percentileScored 2026-11-07
Fix Partial Red Hat: 3 advisoriesRed Hat: 3 fixed, 2 without a fix

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
Yes
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
—libssh21.11.0; 1.11.1—No fix listedCNA
  • libssh2 Vendor— Affected 1.11.0; 1.11.1 Fixed in — No fix listed CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:libssh2:libssh2:*:*:*:*:*:*:*:*up to 1.11.1VulnerableThe libssh2 Project
  • cpe:2.3:a:libssh2:libssh2:*:*:*:*:*:*:*:* Versions up to 1.11.1 Vulnerable ·The libssh2 Project

Remediation

Red Hat 3 advisories

  • RHSA-2026:61752 Released 2026-08-31 · Red Hat rating Important
    libssh2 security update
    • Red Hat Enterprise Linux Server (v. 7 ELS) libssh2-1.8.0-4.el7_9.2, libssh2-1.8.0-4.el7_9.2.ppc
    • Red Hat Enterprise Linux Server Optional (v. 7 ELS) libssh2-devel-1.8.0-4.el7_9.2, libssh2-devel-1.8.0-4.el7_9.2.ppc
  • RHSA-2026:16736 Released 2026-05-13 · Red Hat rating Important
    Red Hat Hardened Images RPMs bug fix and enhancement update
    • Red Hat Hardened Images rust-1.95.0-5.hum1@aarch64, rust-1.95.0-5.hum1@src, rust-1.95.0-5.hum1@x86_64 +28
  • RHSA-2026:7021 Released 2026-04-08 · Red Hat rating Important
    Red Hat Hardened Images RPMs bug fix and enhancement update
    • Red Hat Hardened Images libssh2-1.11.1-5.1.hum1@aarch64, libssh2-1.11.1-5.1.hum1@src, libssh2-1.11.1-5.1.hum1@x86_64 +4

Vendor assessments

Red Hat

Red Hat rating: Important. Red Hat's page for this CVE →

ProductStatusPlan or fix
Red Hat Enterprise Linux 6AffectedNo fix planned: Will not fix
Red Hat Trusted Profile AnalyzerAffectedNo fix yet
Red Hat Enterprise Linux Server (v. 7 ELS)Fixed RHSA-2026:61752
Red Hat Enterprise Linux Server Optional (v. 7 ELS)Fixed RHSA-2026:61752
Red Hat Hardened ImagesFixed RHSA-2026:16736, RHSA-2026:7021
Not affected: 5 products
  • Red Hat Enterprise Linux Server (v. 7 ELS)
  • Red Hat Enterprise Linux Server Optional (v. 7 ELS)
  • Red Hat Hardened Images
  • Red Hat OpenShift Container Platform 4
  • Red Hat OpenShift Update Service

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-7598
  2. 2026-10-03 Alias added: GHSA-jhp3-h4hp-2c3p
  3. 2026-10-25 EPSS moved to the below the 50th percentile
  4. 2026-11-05 Affected versions changed · Red Hat

References

Patch 2

Other 1

  • TI-2026-39880 libssh2 - Out-of-Bounds Write via Unchecked packet_length in transport.c CVSS 4.0CRITICAL 9.2
  • TI-2023-26623 The SSH transport protocol with certain OpenSSH extensions, found in OpenSSH before 9.6… CVSS 3.1MEDIUM 5.9
  • TI-2026-41806 libssh2 - Free of Uninitialized Pointer in publickey List Cleanup CVSS 4.0HIGH 8.3
  • TI-2019-02869 Out-of-bounds read in libssh2 CVSS 3.1CRITICAL 9.1
  • TI-2019-02865 Integer overflow in libssh2 CVSS 3.1HIGH 8.8
  • TI-2019-02872 Out-of-bounds read in libssh2 CVSS 3.0CRITICAL 9.1
See all 24 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences