CVE catalog

CVE-2026-55995

A Double Free vulnerability in open-iscsi allows an unauthenticated MITM attacker to cause DoS. This issue affects open-iscsi: from ? through 56718d4e9d1a4f51c30697b5c0534144bb41c9bb.

[CVE catalog]

Severity: High · CVSS 8.7
Published: Jul 29, 2026, 2:16:31 PM UTC
Source: [NVD] · [CVE record]
EPSS: 0.25% · Oct 22, 2026

A Double Free vulnerability in open-iscsi allows an unauthenticated MITM attacker to cause DoS. This issue affects open-iscsi: from ? through 56718d4e9d1a4f51c30697b5c0534144bb41c9bb.

Vulnerable and fixed packages

Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.

Distribution	Package	Release	Version	Status
Debian	open-isns	sid	`0.103-2`	fixed
Debian	open-isns	forky	`0.103-2`	fixed
Debian	open-isns	trixie	`0.101-1`	vulnerable
Debian	open-isns	bookworm	`0.101-0.2`	vulnerable
Ubuntu	open-isns	noble	`0.101-0.3ubuntu0.1`	fixed
Ubuntu	libisns-dev	noble	`0.101-0.3ubuntu0.1`	fixed
Ubuntu	libisns0t64	noble	`0.101-0.3ubuntu0.1`	fixed
Ubuntu	open-isns-discoveryd	noble	`0.101-0.3ubuntu0.1`	fixed
Ubuntu	open-isns-server	noble	`0.101-0.3ubuntu0.1`	fixed
Ubuntu	open-isns-utils	noble	`0.101-0.3ubuntu0.1`	fixed
Ubuntu	open-isns	pro	`0.97-3`	vulnerable
Ubuntu	open-isns	pro	`0.97-3ubuntu0.1~esm1`	fixed
Ubuntu	open-isns	22.04	`0.100-3ubuntu3`	vulnerable
Ubuntu	open-isns	22.04	`0.100-3ubuntu4`	vulnerable
Ubuntu	open-isns	22.04	`0.100-3ubuntu5`	vulnerable
Ubuntu	open-isns	22.04	`0.101-0ubuntu1`	vulnerable
Ubuntu	open-isns	22.04	`0.101-0ubuntu2`	vulnerable
Ubuntu	open-isns	22.04	`0.101-0ubuntu2.1`	fixed
Ubuntu	open-isns	24.04	`0.101-0.2`	vulnerable
Ubuntu	open-isns	24.04	`0.101-0.3`	vulnerable
Ubuntu	open-isns	24.04	`0.101-0.3build1`	vulnerable
Ubuntu	open-isns	24.04	`0.101-0.3build2`	vulnerable
Ubuntu	open-isns	24.04	`0.101-0.3build3`	vulnerable
Ubuntu	open-isns	24.04	`0.101-0.3ubuntu0.1`	fixed
Ubuntu	open-isns	26.04	`0.101-1`	vulnerable
Ubuntu	open-isns	26.04	`0.101-1build1`	vulnerable
Ubuntu	open-isns	26.04	`0.101-2`	vulnerable
Ubuntu	open-isns	26.04	`0.101-2.1`	vulnerable
Ubuntu	open-isns	26.04	`0.101-2.1ubuntu0.1`	fixed
Opensuse	open-isns	tumbleweed	`0.103+4.60de8b5-1.1`	fixed

Fixed-version evidence

Distribution	Package	Type	Release	Fixed version	Urgency	Origin	Bugs
Debian	open-isns	source	sid	`0.103-2`	not yet assigned	Not reported	[1143053]
Debian	open-isns	source	forky	`0.103-2`	not yet assigned	Not reported	[1143053]
Debian	open-isns	source	trixie	`(unfixed)`	not yet assigned	Not reported	[1143053]
Debian	open-isns	source	bookworm	`(unfixed)`	not yet assigned	Not reported	[1143053]
Ubuntu	open-isns	deb	noble	`0.101-0.3ubuntu0.1`	Not reported	Not reported	Not reported
Ubuntu	libisns-dev	deb	noble	`0.101-0.3ubuntu0.1`	Not reported	Not reported	Not reported
Ubuntu	libisns0t64	deb	noble	`0.101-0.3ubuntu0.1`	Not reported	Not reported	Not reported
Ubuntu	open-isns-discoveryd	deb	noble	`0.101-0.3ubuntu0.1`	Not reported	Not reported	Not reported
Ubuntu	open-isns-server	deb	noble	`0.101-0.3ubuntu0.1`	Not reported	Not reported	Not reported
Ubuntu	open-isns-utils	deb	noble	`0.101-0.3ubuntu0.1`	Not reported	Not reported	Not reported
Ubuntu	open-isns	deb	pro	`0.97-3ubuntu0.1~esm1`	Not reported	USN-8807-1	Not reported
Ubuntu	open-isns	deb	22.04	`0.101-0ubuntu2.1`	Not reported	USN-8807-1	Not reported
Ubuntu	open-isns	deb	24.04	`0.101-0.3ubuntu0.1`	Not reported	USN-8807-1	Not reported
Ubuntu	open-isns	deb	26.04	`0.101-2.1ubuntu0.1`	Not reported	USN-8807-1	Not reported
Opensuse	open-isns	rpm	tumbleweed	`0.103+4.60de8b5-1.1`	Not reported	OPENSUSE-SU-2026:11456-1	Not reported

[Debian bug #1143053]

Notes

[trixie] open-isns: Minor issue [bookworm] open-isns: minor issue

OpenFactory catalog packages

[Debian 12 (Bookworm)]

[iscsiuio]Affected
Source package: [open-iscsi]
Details (2)
- 2.1.8-1 · amd64 · bookworm
  Affected
  nvd · open-iscsi · debian · bookworm
- 2.1.8-1 · arm64 · bookworm
  Affected
  nvd · open-iscsi · debian · bookworm
[libisns0]Affected
Source package: [open-isns]
Details (2)
- 0.101-0.2+b1 · amd64 · bookworm
  Affected
  nvd · open-isns · debian · bookworm; nvd · open-isns · debian · 12
- 0.101-0.2+b1 · arm64 · bookworm
  Affected
  nvd · open-isns · debian · bookworm; nvd · open-isns · debian · 12
[libisns-dev]Affected
Source package: [open-isns]
Details (2)
- 0.101-0.2+b1 · amd64 · bookworm
  Affected
  nvd · open-isns · debian · bookworm; nvd · open-isns · debian · 12
- 0.101-0.2+b1 · arm64 · bookworm
  Affected
  nvd · open-isns · debian · bookworm; nvd · open-isns · debian · 12
[libopeniscsiusr]Affected
Source package: [open-iscsi]
Details (2)
- 2.1.8-1 · amd64 · bookworm
  Affected
  nvd · open-iscsi · debian · bookworm
- 2.1.8-1 · arm64 · bookworm
  Affected
  nvd · open-iscsi · debian · bookworm
[libopeniscsiusr-dev]Affected
Source package: [open-iscsi]
Details (2)
- 2.1.8-1 · all · bookworm
  Affected
  nvd · open-iscsi · debian · bookworm
- 2.1.8-1 · all · bookworm
  Affected
  nvd · open-iscsi · debian · bookworm
[open-iscsi]Affected
Details (2)
- 2.1.8-1 · amd64 · bookworm
  Affected
  nvd · open-iscsi · debian · bookworm
- 2.1.8-1 · arm64 · bookworm
  Affected
  nvd · open-iscsi · debian · bookworm
[open-isns-discoveryd]Affected
Source package: [open-isns]
Details (2)
- 0.101-0.2+b1 · amd64 · bookworm
  Affected
  nvd · open-isns · debian · bookworm; nvd · open-isns · debian · 12
- 0.101-0.2+b1 · arm64 · bookworm
  Affected
  nvd · open-isns · debian · bookworm; nvd · open-isns · debian · 12
[open-isns-server]Affected
Source package: [open-isns]
Details (2)
- 0.101-0.2+b1 · amd64 · bookworm
  Affected
  nvd · open-isns · debian · bookworm; nvd · open-isns · debian · 12
- 0.101-0.2+b1 · arm64 · bookworm
  Affected
  nvd · open-isns · debian · bookworm; nvd · open-isns · debian · 12
[open-isns-utils]Affected
Source package: [open-isns]
Details (2)
- 0.101-0.2+b1 · amd64 · bookworm
  Affected
  nvd · open-isns · debian · bookworm; nvd · open-isns · debian · 12
- 0.101-0.2+b1 · arm64 · bookworm
  Affected
  nvd · open-isns · debian · bookworm; nvd · open-isns · debian · 12

[Debian 13 (Trixie)]

[libisns0t64]Affected
Source package: [open-isns]
Details (2)
- 0.101-1+b1 · amd64 · trixie
  Affected
  nvd · open-isns · debian · 13
- 0.101-1+b1 · arm64 · trixie
  Affected
  nvd · open-isns · debian · 13
[libisns-dev]Affected
Source package: [open-isns]
Details (2)
- 0.101-1+b1 · amd64 · trixie
  Affected
  nvd · open-isns · debian · 13
- 0.101-1+b1 · arm64 · trixie
  Affected
  nvd · open-isns · debian · 13
[open-isns-discoveryd]Affected
Source package: [open-isns]
Details (2)
- 0.101-1+b1 · amd64 · trixie
  Affected
  nvd · open-isns · debian · 13
- 0.101-1+b1 · arm64 · trixie
  Affected
  nvd · open-isns · debian · 13
[open-isns-server]Affected
Source package: [open-isns]
Details (2)
- 0.101-1+b1 · amd64 · trixie
  Affected
  nvd · open-isns · debian · 13
- 0.101-1+b1 · arm64 · trixie
  Affected
  nvd · open-isns · debian · 13
[open-isns-utils]Affected
Source package: [open-isns]
Details (2)
- 0.101-1+b1 · amd64 · trixie
  Affected
  nvd · open-isns · debian · 13
- 0.101-1+b1 · arm64 · trixie
  Affected
  nvd · open-isns · debian · 13

[openSUSE Tumbleweed]

[open-isns-devel]Unknown
Source package: [open-isns]
Details (1)
- 0.103+4.60de8b5-1.1 · x86_64 · tumbleweed
  Unknown · Fixed: 0.103+4.60de8b5-1.1
  Version impact unknown
  nvd · open-isns · opensuse · tumbleweed
[open-isns]Fixed
Source package: [open-isns]
Details (1)
- 0.103+4.60de8b5-1.1 · x86_64 · tumbleweed
  Fixed · Fixed: 0.103+4.60de8b5-1.1
  nvd · open-isns · opensuse · tumbleweed

Observed: Oct 23, 2026, 9:43:10 PM UTC

References

[CERT-Bund public advisories] · [Debian Security Tracker] · [FIRST EPSS] · [National Vulnerability Database (NVD)] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX] · [SUSE security advisories and VEX] · [Ubuntu Security Notices (USN)]