# CVE-2026-7598: libssh2 userauth.c userauth_password integer overflow

CVE-2026-7598 is fixed in 10 products on 1 platform, first by libssh2-1t64 1.11.1-1ubuntu0.26.04.1, released May 1, 2026. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2026-7598
- Priority: High
- CVSS: 7.3 (Moderate)
- EPSS: 0.0047
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: May 1, 2026
- Weakness: Integer Overflow or Wraparound
- Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-7598

## Description

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.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | cargo-c amzn 2023 | 0.10.19-1.amzn2023.0.3 | [ALAS2023-2026-1872](https://patchblox.com/security/data/fix/linux/alas2023-2026-1872.md) | Jun 22, 2026 |
| Linux | cargo-c-debuginfo amzn 2023 | 0.10.19-1.amzn2023.0.3 | [ALAS2023-2026-1872](https://patchblox.com/security/data/fix/linux/alas2023-2026-1872.md) | Jun 22, 2026 |
| Linux | libssh2 Debian 12.15 (bookworm) | 1.10.0-3+deb12u1 | [DEBIAN-CVE-2026-7598](https://patchblox.com/security/data/fix/linux/debian-cve-2026-7598.md) | May 27, 2026 |
| Linux | libssh2 Debian 13.5 (trixie) | 1.11.1-1+deb13u1 | [DEBIAN-CVE-2026-7598](https://patchblox.com/security/data/fix/linux/debian-cve-2026-7598.md) | May 27, 2026 |
| Linux | libssh2 Debian 14 | 1.11.1-3 | [DEBIAN-CVE-2026-7598](https://patchblox.com/security/data/fix/linux/debian-cve-2026-7598.md) | May 27, 2026 |
| Linux | libssh2 amzn 2023 | 1.10.0-1.amzn2023.0.4 | [ALAS2023-2026-1779](https://patchblox.com/security/data/fix/linux/alas2023-2026-1779.md) | Jun 8, 2026 |
| Linux | libssh2-1t64 Ubuntu 24.04.5 LTS (noble) | 1.11.0-4.1ubuntu0.24.04.1 | [libssh2-1t64 1.11.0-4.1ubuntu0.24.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-noble-libssh2-1t64-1.11.0-4.1ubuntu0.24.04.1.md) | May 27, 2026 |
| Linux | libssh2-1t64 Ubuntu 25.10 (questing) | 1.11.1-1ubuntu0.25.10.1 | [libssh2-1t64 1.11.1-1ubuntu0.25.10.1](https://patchblox.com/security/data/fix/linux/ubuntu-questing-libssh2-1t64-1.11.1-1ubuntu0.25.10.1.md) | May 27, 2026 |
| Linux | libssh2-1t64 Ubuntu 26.04.1 LTS (resolute) | 1.11.1-1ubuntu0.26.04.1 | [libssh2-1t64 1.11.1-1ubuntu0.26.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-libssh2-1t64-1.11.1-1ubuntu0.26.04.1.md) | May 1, 2026 |
| Linux | libssh2-debuginfo amzn 2023 | 1.10.0-1.amzn2023.0.4 | [ALAS2023-2026-1779](https://patchblox.com/security/data/fix/linux/alas2023-2026-1779.md) | Jun 8, 2026 |
| Linux | libssh2-debugsource amzn 2023 | 1.10.0-1.amzn2023.0.4 | [ALAS2023-2026-1779](https://patchblox.com/security/data/fix/linux/alas2023-2026-1779.md) | Jun 8, 2026 |
| Linux | libssh2-devel amzn 2023 | 1.10.0-1.amzn2023.0.4 | [ALAS2023-2026-1779](https://patchblox.com/security/data/fix/linux/alas2023-2026-1779.md) | Jun 8, 2026 |
| Linux | libssh2-docs amzn 2023 | 1.10.0-1.amzn2023.0.4 | [ALAS2023-2026-1779](https://patchblox.com/security/data/fix/linux/alas2023-2026-1779.md) | Jun 8, 2026 |
| Linux | libssh2_org opensuse-leap 16.0 | 1.11.1-160000.5.1 | [OPENSUSE-SU-2026:21549-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-21549-1.md) | Aug 10, 2026 |
| Linux | libssh2_org sles 15.6 | 1.11.0-150600.20.6.1 | [SUSE-SU-2026:3541-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-3541-1.md) | Aug 10, 2026 |
| Linux | libssh2_org sles 15.7 | 1.11.0-150600.20.6.1 | [SUSE-SU-2026:3541-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-3541-1.md) | Aug 10, 2026 |
| Linux | libssh2_org sles 16.0 | 1.11.1-160000.5.1 | [SUSE-SU-2026:23225-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-23225-1.md) | Aug 10, 2026 |
| Linux | rust-cargo-c-debugsource amzn 2023 | 0.10.19-1.amzn2023.0.3 | [ALAS2023-2026-1872](https://patchblox.com/security/data/fix/linux/alas2023-2026-1872.md) | Jun 22, 2026 |

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Data as of 2026-11-08T00:53:09Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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