CVE-2026-55995
open-isns: A Double Free vulnerability in open-iscsi allows an unauthenticated MITM attacker to cause DoS
CVE-2026-55995 is fixed in 12 products on 1 platform, first by libisns0 0.97-2ubuntu0.1~esm1, released July 29, 2026. It is not reported as exploited. Patch Radar priority: High.
High
CVSS
7.5
Important
Exploitation
None reported
No vendor assessment
CISA KEV
Not listed
Not in the Known Exploited Vulnerabilities catalog
EPSS
0.0025
16th percentile
A Double Free vulnerability in open-iscsi allows an unauthenticated MITM attacker to cause DoS. This issue affects open-iscsi: from ? through 56718d4e9d1a4f51c30697b5c0534144bb41c9bb.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| isns-utils · RHEL 10 | 0.103-1.el10_0.1 | RHSA-2026:60005 | Aug 13, 2026 |
| isns-utils · RHEL 8 | 0:0.99-1.el8_10.1 | RHSA-2026:53848 | Aug 13, 2026 |
| isns-utils · RHEL 9 | 0:0.101-4.el9_8.1 | RHSA-2026:53847 | Aug 13, 2026 |
| isns-utils · almalinux 10 | 0.103-1.el10_2.1 | ALSA-2026:53846 | Aug 11, 2026 |
| isns-utils · almalinux 8 | 0.99-1.el8_10.1 | ALSA-2026:53848 | Aug 11, 2026 |
| isns-utils · almalinux 9 | 0.101-4.el9_8.1 | ALSA-2026:53847 | Aug 11, 2026 |
| isns-utils · amzn 2023 | 0.101-6.amzn2023.0.1 | ALAS2023-2026-2054 | Aug 17, 2026 |
| isns-utils · ol 10 | 0:0.103-1.el10_2.1 | ELSA-2026-53846 | Aug 11, 2026 |
| isns-utils · ol 8 | 0:0.99-1.el8_10.1 | ELSA-2026-53848 | Aug 12, 2026 |
| isns-utils · ol 9 | 0:0.101-4.el9_8.1 | ELSA-2026-53847 | Aug 11, 2026 |
| isns-utils · rocky 10 | 0:0.103-1.el10_2.1 | RLSA-2026:53846 | Aug 12, 2026 |
| isns-utils · rocky 8 | 0:0.99-1.el8_10.1 | RLSA-2026:53848 | Aug 12, 2026 |
| isns-utils · rocky 9 | 0:0.101-4.el9_8.1 | RLSA-2026:53847 | Aug 12, 2026 |
| isns-utils-debuginfo · amzn 2023 | 0.101-6.amzn2023.0.1 | ALAS2023-2026-2054 | Aug 17, 2026 |
| isns-utils-debugsource · amzn 2023 | 0.101-6.amzn2023.0.1 | ALAS2023-2026-2054 | Aug 17, 2026 |
| isns-utils-devel · RHEL 8 | 0:0.99-1.el8_10.1 | RHSA-2026:53848 | Aug 13, 2026 |
| isns-utils-devel · almalinux 8 | 0.99-1.el8_10.1 | ALSA-2026:53848 | Aug 11, 2026 |
| isns-utils-devel · amzn 2023 | 0.101-6.amzn2023.0.1 | ALAS2023-2026-2054 | Aug 17, 2026 |
| isns-utils-devel · ol 8 | 0:0.99-1.el8_10.1 | ELSA-2026-53848 | Aug 12, 2026 |
| isns-utils-libs · RHEL 8 | 0:0.99-1.el8_10.1 | RHSA-2026:53848 | Aug 13, 2026 |
| isns-utils-libs · RHEL 9 | 0:0.101-4.el9_8.1 | RHSA-2026:53847 | Aug 13, 2026 |
| isns-utils-libs · almalinux 10 | 0.103-1.el10_2.1 | ALSA-2026:53846 | Aug 11, 2026 |
| isns-utils-libs · almalinux 8 | 0.99-1.el8_10.1 | ALSA-2026:53848 | Aug 11, 2026 |
| isns-utils-libs · almalinux 9 | 0.101-4.el9_8.1 | ALSA-2026:53847 | Aug 11, 2026 |
| isns-utils-libs · amzn 2023 | 0.101-6.amzn2023.0.1 | ALAS2023-2026-2054 | Aug 17, 2026 |
| isns-utils-libs · ol 10 | 0:0.103-1.el10_2.1 | ELSA-2026-53846 | Aug 11, 2026 |
| isns-utils-libs · ol 8 | 0:0.99-1.el8_10.1 | ELSA-2026-53848 | Aug 12, 2026 |
| isns-utils-libs · ol 9 | 0:0.101-4.el9_8.1 | ELSA-2026-53847 | Aug 11, 2026 |
| isns-utils-libs-debuginfo · amzn 2023 | 0.101-6.amzn2023.0.1 | ALAS2023-2026-2054 | Aug 17, 2026 |
| libisns0 · Ubuntu 18.04.6 LTS (bionic) | 0.97-2ubuntu0.1~esm1 | libisns0 0.97-2ubuntu0.1~esm1 | Jul 29, 2026 |
| libisns0 · Ubuntu 20.04 LTS (focal) | 0.97-3ubuntu0.1~esm1 | libisns0 0.97-3ubuntu0.1~esm1 | Jul 29, 2026 |
| libisns0 · Ubuntu 22.04.1 LTS (jammy) | 0.101-0ubuntu2.1 | libisns0 0.101-0ubuntu2.1 | Jul 29, 2026 |
| libisns0t64 · Ubuntu 24.04.5 LTS (noble) | 0.101-0.3ubuntu0.1 | libisns0t64 0.101-0.3ubuntu0.1 | Jul 29, 2026 |
| libisns0t64 · Ubuntu 26.04.1 LTS (resolute) | 0.101-2.1ubuntu0.1 | libisns0t64 0.101-2.1ubuntu0.1 | Jul 29, 2026 |
| open-isns · Debian 14 | 0.103-2 | DEBIAN-CVE-2026-55995 | Aug 4, 2026 |
| open-isns-discoveryd · Ubuntu 18.04.6 LTS (bionic) | 0.97-2ubuntu0.1~esm1 | open-isns-discoveryd 0.97-2ubuntu0.1~esm1 | Jul 29, 2026 |
| open-isns-discoveryd · Ubuntu 20.04 LTS (focal) | 0.97-3ubuntu0.1~esm1 | open-isns-discoveryd 0.97-3ubuntu0.1~esm1 | Jul 29, 2026 |
| open-isns-discoveryd · Ubuntu 22.04.1 LTS (jammy) | 0.101-0ubuntu2.1 | open-isns-discoveryd 0.101-0ubuntu2.1 | Jul 29, 2026 |
| open-isns-discoveryd · Ubuntu 24.04.5 LTS (noble) | 0.101-0.3ubuntu0.1 | open-isns-discoveryd 0.101-0.3ubuntu0.1 | Jul 29, 2026 |
| open-isns-discoveryd · Ubuntu 26.04.1 LTS (resolute) | 0.101-2.1ubuntu0.1 | open-isns-discoveryd 0.101-2.1ubuntu0.1 | Jul 29, 2026 |
| open-isns-server · Ubuntu 18.04.6 LTS (bionic) | 0.97-2ubuntu0.1~esm1 | open-isns-server 0.97-2ubuntu0.1~esm1 | Jul 29, 2026 |
| open-isns-server · Ubuntu 20.04 LTS (focal) | 0.97-3ubuntu0.1~esm1 | open-isns-server 0.97-3ubuntu0.1~esm1 | Jul 29, 2026 |
| open-isns-server · Ubuntu 22.04.1 LTS (jammy) | 0.101-0ubuntu2.1 | open-isns-server 0.101-0ubuntu2.1 | Jul 29, 2026 |
| open-isns-server · Ubuntu 24.04.5 LTS (noble) | 0.101-0.3ubuntu0.1 | open-isns-server 0.101-0.3ubuntu0.1 | Jul 29, 2026 |
| open-isns-server · Ubuntu 26.04.1 LTS (resolute) | 0.101-2.1ubuntu0.1 | open-isns-server 0.101-2.1ubuntu0.1 | Jul 29, 2026 |
| open-isns-utils · Ubuntu 18.04.6 LTS (bionic) | 0.97-2ubuntu0.1~esm1 | open-isns-utils 0.97-2ubuntu0.1~esm1 | Jul 29, 2026 |
| open-isns-utils · Ubuntu 20.04 LTS (focal) | 0.97-3ubuntu0.1~esm1 | open-isns-utils 0.97-3ubuntu0.1~esm1 | Jul 29, 2026 |
| open-isns-utils · Ubuntu 22.04.1 LTS (jammy) | 0.101-0ubuntu2.1 | open-isns-utils 0.101-0ubuntu2.1 | Jul 29, 2026 |
| open-isns-utils · Ubuntu 24.04.5 LTS (noble) | 0.101-0.3ubuntu0.1 | open-isns-utils 0.101-0.3ubuntu0.1 | Jul 29, 2026 |
| open-isns-utils · Ubuntu 26.04.1 LTS (resolute) | 0.101-2.1ubuntu0.1 | open-isns-utils 0.101-2.1ubuntu0.1 | Jul 29, 2026 |
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