CVE-2026-43003 [High] | Command Injection in Ironic Python Agent

An issue was discovered in OpenStack ironic-python-agent 1.0.0 through 11.5.0. Ironic Python Agent (IPA) sometimes executes grub-install from within a chroot of the deployed partition image, leading to code execution in the case of a malicious image.

#	Date	Old EPSS score	New EPSS score	Delta (New - Old)
1	2026-06-30	0.70%	0.84%	+0.14%
2	2026-06-23	0.64%	0.70%	+0.06%
3	2026-06-17	—	0.64%	—

Date

Old EPSS score

New EPSS score

Delta (New - Old)

2026-06-30

0.70%

0.84%

+0.14%

2026-06-23

0.64%

0.70%

+0.06%

2026-06-17

—

0.64%

—

Base score	Version	Severity	Vector	Exploitability	Impact	Score source
8.0	3.1	HIGH	`CVSS:3.1/AV:A/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H` Click to expand Attack vector (AV:A) Attacker has to be nearby on the network—same office, same link, that vibe—not the whole wide internet. Attack complexity (AC:H) Even with access, the exploit needs extra luck, timing, or a fussy environment to actually work. Privileges required (PR:L) A normal user session is enough; they don’t have to be admin. User interaction (UI:N) Nobody has to click “OK” or open a trap file; it can work without a victim helping. Scope (S:C) Breaking this can reach past the original component and bite other resources—bigger blast radius. Confidentiality (C:H) Serious risk that confidential data gets exposed in a big way. Integrity (I:H) They could widely tamper with or forge data—trust in the data is badly hurt. Availability (A:H) Could take the service down hard or make it unusable for people who depend on it.	1.3	6.0	[email protected]
7.5	3.1	HIGH	`CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H` Click to expand Attack vector (AV:N) Could be attacked over the internet or any normal routed network—not just someone sitting at the machine. Attack complexity (AC:H) Even with access, the exploit needs extra luck, timing, or a fussy environment to actually work. Privileges required (PR:L) A normal user session is enough; they don’t have to be admin. User interaction (UI:N) Nobody has to click “OK” or open a trap file; it can work without a victim helping. Scope (S:U) Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems. Confidentiality (C:H) Serious risk that confidential data gets exposed in a big way. Integrity (I:H) They could widely tamper with or forge data—trust in the data is badly hurt. Availability (A:H) Could take the service down hard or make it unusable for people who depend on it.	1.6	5.9	[email protected]
8.5	3.1	HIGH	`CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H` Click to expand Attack vector (AV:N) Could be attacked over the internet or any normal routed network—not just someone sitting at the machine. Attack complexity (AC:H) Even with access, the exploit needs extra luck, timing, or a fussy environment to actually work. Privileges required (PR:L) A normal user session is enough; they don’t have to be admin. User interaction (UI:N) Nobody has to click “OK” or open a trap file; it can work without a victim helping. Scope (S:C) Breaking this can reach past the original component and bite other resources—bigger blast radius. Confidentiality (C:H) Serious risk that confidential data gets exposed in a big way. Integrity (I:H) They could widely tamper with or forge data—trust in the data is badly hurt. Availability (A:H) Could take the service down hard or make it unusable for people who depend on it.	1.8	6.0	0b0ca135-0b70-47e7-9f44-1890c2a1c46c

Base score

Version

Severity

Vector

Exploitability

Impact

Score source

8.0

3.1

HIGH

CVSS:3.1/AV:A/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H Click to expand

Attack vector (AV:A): Attacker has to be nearby on the network—same office, same link, that vibe—not the whole wide internet.
Attack complexity (AC:H): Even with access, the exploit needs extra luck, timing, or a fussy environment to actually work.
Privileges required (PR:L): A normal user session is enough; they don’t have to be admin.
User interaction (UI:N): Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:C): Breaking this can reach past the original component and bite other resources—bigger blast radius.
Confidentiality (C:H): Serious risk that confidential data gets exposed in a big way.
Integrity (I:H): They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:H): Could take the service down hard or make it unusable for people who depend on it.

1.3

6.0

[email protected]

7.5

3.1

HIGH

CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H Click to expand

Attack vector (AV:N): Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:H): Even with access, the exploit needs extra luck, timing, or a fussy environment to actually work.
Privileges required (PR:L): A normal user session is enough; they don’t have to be admin.
User interaction (UI:N): Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U): Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H): Serious risk that confidential data gets exposed in a big way.
Integrity (I:H): They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:H): Could take the service down hard or make it unusable for people who depend on it.

1.6

5.9

[email protected]

8.5

3.1

HIGH

CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H Click to expand

Attack vector (AV:N): Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:H): Even with access, the exploit needs extra luck, timing, or a fussy environment to actually work.
Privileges required (PR:L): A normal user session is enough; they don’t have to be admin.
User interaction (UI:N): Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:C): Breaking this can reach past the original component and bite other resources—bigger blast radius.
Confidentiality (C:H): Serious risk that confidential data gets exposed in a big way.
Integrity (I:H): They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:H): Could take the service down hard or make it unusable for people who depend on it.

1.8

6.0

0b0ca135-0b70-47e7-9f44-1890c2a1c46c

OS Trackers for CVE-2026-43003

vendor	priority	summary	link
`debian`	not yet assigned	CVE-2026-43003 not yet assigned priority: Debian including 2 source packages (ironic, ironic-python-agent), 8 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): open 4, resolved 4.	https://security-tracker.debian.org/tracker/CVE-2026-43003
`ubuntu`	medium	CVE-2026-43003 medium priority: Ubuntu including 1 source packages (ironic-python-agent), 5 status rows across 5 suites (jammy, noble, questing, resolute, upstream): needs-triage 4, DNE 1.	https://ubuntu.com/security/CVE-2026-43003

Affected software / configurations for CVE-2026-43003

Vendor	Product	Version	Raw CPE
openstack	ironic_python_agent	>= 1.0.0, <= 11.5.0	cpe:2.3:a:openstack:ironic_python_agent::::::::

References for CVE-2026-43003

URL	Tags
https://bugs.launchpad.net/ironic-python-agent/+bug/2148310	Issue Tracking
https://github.com/openstack/ironic-python-agent/blob/236b33abffe6688afc39c21e351cc3889b3db2dd/ironic_python_agent/efi_utils.py#L134-L139	Product
http://www.openwall.com/lists/oss-security/2026/06/16/11
https://access.redhat.com/security/cve/CVE-2026-43003
https://bugzilla.redhat.com/show_bug.cgi?id=2464306
https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-43003.json

URL

CVE-2026-43003

Exploit prediction scoring system (EPSS) score for CVE-2026-43003

Common vulnerability scoring system (CVSS) metrics for CVE-2026-43003

Weakness enumeration for CVE-2026-43003

GitHub Security Advisory for CVE-2026-43003

OS Trackers for CVE-2026-43003

Affected software / configurations for CVE-2026-43003

References for CVE-2026-43003