CVE catalog
CVE-2026-18728
A flaw was found in open-iscsi. An integer underflow vulnerability in the `iscsiuio` component, specifically during IPv4 Dynamic Host Configuration Protocol (DHCP) parsing, allows a remote attacker on
- 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. An integer underflow vulnerability in the `iscsiuio` component, specifically during IPv4 Dynamic Host Configuration Protocol (DHCP) parsing, allows a remote attacker on the same local network segment to cause a denial of service. By sending a specially crafted IPv4/UDP DHCP reply, the attacker can trigger an out-of-bounds read, leading to the `iscsiuio` process crashing. This issue affects systems where `iscsiuio` is actively handling IPv4 DHCP traffic.
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 |
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] |
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
Observed:
References
- [https://ftp.suse.com/pub/projects/security/csaf/opensuse-su-2026_12102-1.json]
- [https://nvd.nist.gov/vuln/detail/CVE-2026-18728]
- [https://osv.dev/vulnerability/DEBIAN-CVE-2026-18728]
- [https://security-tracker.debian.org/tracker/CVE-2026-18728]
[Debian Security Tracker] · [FIRST EPSS] · [National Vulnerability Database (NVD)] · [OSV Package Vulnerability Database] · [SUSE security advisories and VEX]