CVE catalog
CVE-2026-18727
A flaw was found in open-iscsi's iscsiuio component. This vulnerability involves an integer underflow and out-of-bounds read during Dynamic Host Configuration Protocol for IPv6 (DHCPv6) packet parsing
- Severity
- Medium · CVSS 6.5
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H - Published
- Source
- [NVD] · [CVE record]
- EPSS
- 0.19% · Oct 22, 2026
A flaw was found in open-iscsi's iscsiuio component. This vulnerability involves an integer underflow and out-of-bounds read during Dynamic Host Configuration Protocol for IPv6 (DHCPv6) packet parsing. Specifically, crafted DHCPv6 Advertise traffic with a short User Datagram Protocol (UDP) length can cause the DHCPv6 payload length to underflow. An unauthenticated attacker on an adjacent network segment can exploit this by sending specially crafted IPv6 UDP traffic while the client is in an active DHCPv6 exchange, leading to a denial of service due to a process crash or service disruption.
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-iscsi | sid | 2.1.13-1 | fixed |
| Debian | open-iscsi | forky | 2.1.13-1 | fixed |
| Debian | open-iscsi | trixie | 2.1.11-1+deb13u2 | vulnerable |
| Debian | open-iscsi | bookworm | 2.1.8-1 | vulnerable |
| Debian | open-iscsi | bookworm-security | 2.1.8-1+deb12u1 | fixed |
| Cpe | enterprise_linux | Not reported | Not reported | unknown |
| Opensuse | open-iscsi | tumbleweed | 2.1.13-114.1 | fixed |
Fixed-version evidence
| Distribution | Package | Type | Release | Fixed version | Urgency | Origin | Bugs |
|---|---|---|---|---|---|---|---|
| Debian | open-iscsi | source | sid | 2.1.13-1 | not yet assigned | Not reported | [1144935] |
| Debian | open-iscsi | source | forky | 2.1.13-1 | not yet assigned | Not reported | [1144935] |
| Debian | open-iscsi | source | trixie | (unfixed) | not yet assigned | Not reported | [1144935] |
| Debian | open-iscsi | source | bookworm | 2.1.8-1+deb12u1 | not yet assigned | Not reported | [1144935] |
| Opensuse | open-iscsi | rpm | tumbleweed | 2.1.13-114.1 | Not reported | OPENSUSE-SU-2026:12102-1 | Not reported |
Notes
[trixie] open-iscsi: Minor issue
OpenFactory catalog packages
[Debian 12 (Bookworm)]
- [iscsiuio]Affected
Source package: [open-iscsi]
Details (2)
2.1.8-1· amd64 · bookwormAffected · Fixed:
2.1.8-1+deb12u1nvd · open-iscsi · debian · bookworm; nvd · open-iscsi · debian · 12
2.1.8-1· arm64 · bookwormAffected · Fixed:
2.1.8-1+deb12u1nvd · open-iscsi · debian · bookworm; nvd · open-iscsi · debian · 12
- [libopeniscsiusr]Affected
Source package: [open-iscsi]
Details (2)
2.1.8-1· amd64 · bookwormAffected · Fixed:
2.1.8-1+deb12u1nvd · open-iscsi · debian · bookworm; nvd · open-iscsi · debian · 12
2.1.8-1· arm64 · bookwormAffected · Fixed:
2.1.8-1+deb12u1nvd · open-iscsi · debian · bookworm; nvd · open-iscsi · debian · 12
- [libopeniscsiusr-dev]Affected
Source package: [open-iscsi]
Details (2)
2.1.8-1· all · bookwormAffected · Fixed:
2.1.8-1+deb12u1nvd · open-iscsi · debian · bookworm; nvd · open-iscsi · debian · 12
2.1.8-1· all · bookwormAffected · Fixed:
2.1.8-1+deb12u1nvd · open-iscsi · debian · bookworm; nvd · open-iscsi · debian · 12
- [open-iscsi]Affected
Details (2)
2.1.8-1· amd64 · bookwormAffected · Fixed:
2.1.8-1+deb12u1nvd · open-iscsi · debian · bookworm; nvd · open-iscsi · debian · 12
2.1.8-1· arm64 · bookwormAffected · Fixed:
2.1.8-1+deb12u1nvd · open-iscsi · debian · bookworm; nvd · open-iscsi · debian · 12
[Debian 13 (Trixie)]
- [iscsiuio]Affected
Source package: [open-iscsi]
Details (2)
2.1.11-1+deb13u2· amd64 · trixieAffected
nvd · open-iscsi · debian · 13
2.1.11-1+deb13u2· arm64 · trixieAffected
nvd · open-iscsi · debian · 13
- [libopeniscsiusr]Affected
Source package: [open-iscsi]
Details (2)
2.1.11-1+deb13u2· amd64 · trixieAffected
nvd · open-iscsi · debian · 13
2.1.11-1+deb13u2· arm64 · trixieAffected
nvd · open-iscsi · debian · 13
- [libopeniscsiusr-dev]Affected
Source package: [open-iscsi]
Details (2)
2.1.11-1+deb13u2· all · trixieAffected
nvd · open-iscsi · debian · 13
2.1.11-1+deb13u2· all · trixieAffected
nvd · open-iscsi · debian · 13
- [open-iscsi]Affected
Details (2)
2.1.11-1+deb13u2· amd64 · trixieAffected
nvd · open-iscsi · debian · 13
2.1.11-1+deb13u2· arm64 · trixieAffected
nvd · open-iscsi · debian · 13
[openSUSE Tumbleweed]
- [open-iscsi]Affected
Source package: [open-iscsi]
Details (1)
2.1.12-113.1· x86_64 · tumbleweedAffected · Fixed:
2.1.13-114.1nvd · open-iscsi · opensuse · tumbleweed
- [iscsiuio]Unknown
Source package: [open-iscsi]
Details (1)
0.7.8.8-113.1· x86_64 · tumbleweedUnknown · Fixed:
2.1.13-114.1Version impact unknown
nvd · open-iscsi · opensuse · tumbleweed
- [libopeniscsiusr0]Unknown
Source package: [open-iscsi]
Details (1)
0.2.0-113.1· x86_64 · tumbleweedUnknown · Fixed:
2.1.13-114.1Version impact unknown
nvd · open-iscsi · opensuse · tumbleweed
- [open-iscsi-devel]Unknown
Source package: [open-iscsi]
Details (1)
2.1.12-113.1· x86_64 · tumbleweedUnknown · Fixed:
2.1.13-114.1Version impact unknown
nvd · open-iscsi · opensuse · tumbleweed
Observed:
References
- [https://ftp.suse.com/pub/projects/security/csaf/opensuse-su-2026_12102-1.json]
- [https://nvd.nist.gov/vuln/detail/CVE-2026-18727]
- [https://osv.dev/vulnerability/DEBIAN-CVE-2026-18727]
- [https://osv.dev/vulnerability/openSUSE-SU-2026:12102-1]
- [https://security-tracker.debian.org/tracker/CVE-2026-18727]
[Debian Security Tracker] · [FIRST EPSS] · [National Vulnerability Database (NVD)] · [OSV Package Vulnerability Database] · [SUSE security advisories and VEX]