# CVE-2026-115484: open-iscsi iscsiuio DHCPv4 option buffer overflow

Source: https://junglewise.ai/threats/cve-2026-115484-a-flaw-was-found-in-the-iscsiuio-component-of-open-iscsi-the  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-10-23. Updated: 2026-10-23  
License: CC BY 4.0 with a link back

CVE-2026-115484 · Severity: high · CVSS 7.6 · Published 2026-10-23

open-iscsi is a network utility that manages iSCSI connections, allowing systems to connect to storage servers over a network. A flaw in the DHCPv4 option parser causes it to read beyond its allocated memory buffer when processing a crafted DHCP response, allowing an attacker on the same network to crash the daemon or corrupt network configuration.

Vendors: [Open-Iscsi](https://junglewise.ai/threats/vendors/open-iscsi).

## Quick answers

**Is CVE-2026-115484 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-115484 being exploited in the wild.

**How severe is CVE-2026-115484?** High severity, with a CVSS score of 7.6, published 23 October 2026.

**Which products and versions are affected?** open-iscsi open-iscsi.

**Is there a fix for CVE-2026-115484?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is CVE-2026-115484 attacked?** It is attacked over the network, in a software library.

**Am I affected by CVE-2026-115484?** Check whether you run Open-Iscsi. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

The iscsiuio component incorrectly calculates the length of DHCPv4 option data, leading to an out-of-bounds heap read. An attacker on the same network segment can send a specially crafted DHCP response to trigger the vulnerability, resulting in daemon crash or memory corruption. This is a classic buffer over-read vulnerability in network protocol parsing.

## Affected products

- open-iscsi open-iscsi

## Timeline

- 2026-10-23: disclosed

## References

- [https://access.redhat.com/downloads/content/package-browser/](https://access.redhat.com/downloads/content/package-browser/)
- [https://access.redhat.com/security/cve/CVE-2026-115484](https://access.redhat.com/security/cve/CVE-2026-115484)

## Related threats

- [open-iscsi IPv6 Neighbor Discovery handler buffer access vulnerability](https://junglewise.ai/threats/cve-2026-115486-a-flaw-was-found-in-the-iscsiuio-component-of-open-iscsi-the)