CVE-2026-55995 Double-free in the iSNS attribute decoder in open-iscsi
High 8.7
Published
Updated
Check this codebase for CVE-2026-55995 and fix it if it is affected.
What it is: CVE-2026-55995 is a high-severity use after free vulnerability in open-iscsi, published on 29 Jul 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-55995 in the wild and no public exploit code.
Affected product: open-iscsi. No package-level version data is available, so check the vendor advisory linked from the reference page.
Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.
Reference: https://insights.sbomify.com/CVE-2026-55995/ (Markdown: https://insights.sbomify.com/CVE-2026-55995/index.md)
An unauthenticated man-in-the-middle attacker can trigger a double-free in open-iscsi, causing a denial of service.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-55995?
CVE-2026-55995 is a high-severity use after free vulnerability in open-iscsi, published on 29 Jul 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
A Double Free vulnerability in open-iscsi allows an unauthenticated MITM attacker to cause DoS.
This issue affects open-iscsi: from ? through 56718d4e9d1a4f51c30697b5c0534144bb41c9bb.
Weakness: CWE-415
Which versions are affected by CVE-2026-55995?
Linux distribution packages (40)
isns-utils AlmaLinux:10 | All versions | 0.103-1.el10_2.1 |
isns-utils-libs AlmaLinux:10 | All versions | 0.103-1.el10_2.1 |
isns-utils AlmaLinux:8 | All versions | 0.99-1.el8_10.1 |
isns-utils-devel AlmaLinux:8 | All versions | 0.99-1.el8_10.1 |
isns-utils-libs AlmaLinux:8 | All versions | 0.99-1.el8_10.1 |
isns-utils AlmaLinux:9 | All versions | 0.101-4.el9_8.1 |
isns-utils-libs AlmaLinux:9 | All versions | 0.101-4.el9_8.1 |
isns-utils Red Hat:enterprise_linux:10.2 | All versions | 0:0.103-1.el10_2.1 |
isns-utils-debuginfo Red Hat:enterprise_linux:10.2 | All versions | 0:0.103-1.el10_2.1 |
isns-utils-debugsource Red Hat:enterprise_linux:10.2 | All versions | 0:0.103-1.el10_2.1 |
isns-utils-libs Red Hat:enterprise_linux:10.2 | All versions | 0:0.103-1.el10_2.1 |
isns-utils-libs-debuginfo Red Hat:enterprise_linux:10.2 | All versions | 0:0.103-1.el10_2.1 |
isns-utils Red Hat:enterprise_linux:8::baseos | All versions | 0:0.99-1.el8_10.1 |
isns-utils-debuginfo Red Hat:enterprise_linux:8::baseos | All versions | 0:0.99-1.el8_10.1 |
isns-utils-debugsource Red Hat:enterprise_linux:8::baseos | All versions | 0:0.99-1.el8_10.1 |
isns-utils-devel Red Hat:enterprise_linux:8::baseos | All versions | 0:0.99-1.el8_10.1 |
isns-utils-libs Red Hat:enterprise_linux:8::baseos | All versions | 0:0.99-1.el8_10.1 |
isns-utils-libs-debuginfo Red Hat:enterprise_linux:8::baseos | All versions | 0:0.99-1.el8_10.1 |
isns-utils Red Hat:enterprise_linux:9::baseos | All versions | 0:0.101-4.el9_8.1 |
isns-utils-debuginfo Red Hat:enterprise_linux:9::baseos | All versions | 0:0.101-4.el9_8.1 |
isns-utils-debugsource Red Hat:enterprise_linux:9::baseos | All versions | 0:0.101-4.el9_8.1 |
isns-utils-libs Red Hat:enterprise_linux:9::baseos | All versions | 0:0.101-4.el9_8.1 |
isns-utils-libs-debuginfo Red Hat:enterprise_linux:9::baseos | All versions | 0:0.101-4.el9_8.1 |
isns-utils Red Hat:enterprise_linux_eus:10.0 | All versions | 0:0.103-1.el10_0.1 |
isns-utils-debuginfo Red Hat:enterprise_linux_eus:10.0 | All versions | 0:0.103-1.el10_0.1 |
isns-utils-debugsource Red Hat:enterprise_linux_eus:10.0 | All versions | 0:0.103-1.el10_0.1 |
isns-utils-libs Red Hat:enterprise_linux_eus:10.0 | All versions | 0:0.103-1.el10_0.1 |
isns-utils-libs-debuginfo Red Hat:enterprise_linux_eus:10.0 | All versions | 0:0.103-1.el10_0.1 |
isns-utils Red Hat:rhel_aus:8.4::baseos | All versions | 0:0.99-1.el8_4.1 |
isns-utils-debuginfo Red Hat:rhel_aus:8.4::baseos | All versions | 0:0.99-1.el8_4.1 |
isns-utils-debugsource Red Hat:rhel_aus:8.4::baseos | All versions | 0:0.99-1.el8_4.1 |
isns-utils-devel Red Hat:rhel_aus:8.4::baseos | All versions | 0:0.99-1.el8_4.1 |
isns-utils-libs Red Hat:rhel_aus:8.4::baseos | All versions | 0:0.99-1.el8_4.1 |
isns-utils-libs-debuginfo Red Hat:rhel_aus:8.4::baseos | All versions | 0:0.99-1.el8_4.1 |
isns-utils Red Hat:rhel_aus:8.6::baseos | All versions | 0:0.99-1.el8_6.1 |
isns-utils-debuginfo Red Hat:rhel_aus:8.6::baseos | All versions | 0:0.99-1.el8_6.1 |
isns-utils-debugsource Red Hat:rhel_aus:8.6::baseos | All versions | 0:0.99-1.el8_6.1 |
isns-utils-devel Red Hat:rhel_aus:8.6::baseos | All versions | 0:0.99-1.el8_6.1 |
isns-utils-libs Red Hat:rhel_aus:8.6::baseos | All versions | 0:0.99-1.el8_6.1 |
isns-utils-libs-debuginfo Red Hat:rhel_aus:8.6::baseos | All versions | 0:0.99-1.el8_6.1 |
How do I fix CVE-2026-55995?
Apply the vendor's patch.
Upgrade to the fixed version. These bugs are found with fuzzing and sanitisers and avoided by memory-safe languages. More about Use after free.
Is CVE-2026-55995 being exploited?
There is no known exploitation of CVE-2026-55995 in the wild and no public exploit code.
Sources
Also known as ALSA-2026:53846, ALSA-2026:53847, ALSA-2026:53848, AZL-94434, CLSA-2026-1787739969, CLSA-2026-1787740913 and 20 more.