VulnerabilityPublished 3 Feb 2026Updated 5 May 2026

CVE-2025-58183: image-builder security update

Affects image-builderSource GCVE Database

Authoritative record:CVE-2025-58183· Medium 4.3

Not known to be exploited · CVSS 4.3 Medium : upgrade to 31-3.el10_1 when convenient.

Data as of 27 Oct 2026, 01:43 UTC

CVSS 3.1 base score

4.3Medium

How severe the flaw is on the 0–10 CVSS scale.

Patch: Available – fixed in 31-3.el10_1

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L

Attack Vector: Network
Attack Complexity: Low
Privileges Required: None
User Interaction: Required
Scope: Unchanged
Confidentiality: None
Integrity: None
Availability: Low

Bold values are the worst case: easiest to exploit or largest impact.

Attack Vector: Network: The vulnerable component is bound to the network stack and the set of possible attackers extends beyond the other options listed, up to and including the entire Internet. Such a vulnerability is often termed 'remotely exploitable' and can be thought of as an attack being exploitable at the protocol level one or more network hops away (e.g., across one or more routers).
Attack Complexity: Low: Specialized access conditions or extenuating circumstances do not exist. An attacker can expect repeatable success against the vulnerable component.
Privileges Required: None: The attacker is unauthorized prior to attack, and therefore does not require any access to settings or files to carry out an attack.
User Interaction: Required: Successful exploitation of this vulnerability requires a user to take some action before the vulnerability can be exploited.
Scope: Unchanged: An exploited vulnerability can only affect resources managed by the same security authority. In this case, the vulnerable component and the impacted component are either the same, or both are managed by the same security authority.
Confidentiality: None: There is no loss of confidentiality within the impacted component.
Integrity: None: There is no loss of integrity within the impacted component.
Availability: Low: Performance is reduced or there are interruptions in resource availability. Even if repeated exploitation of the vulnerability is possible, the attacker does not have the ability to completely deny service to legitimate users. The resources in the impacted component are either partially available all of the time, or fully available only some of the time, but overall there is no direct, serious consequence to the impacted component.

Definitions: FIRST CVSS v3.1 specification.

Exploitation evidence

Disclosed: evidence found.
CVE published 29 Oct 2025
Detectable: no evidence on record.
No public nuclei template indexed
Weaponised: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 26 Oct 2026.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponised: Public exploit code exists in Metasploit or Exploit-DB, or CISA SSVC or the CVSS exploit maturity reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

almalinux-10

What to do

Upgrade the AlmaLinux image-builder package to 31-3.el10_1.

Patches and advisories

access.redhat.com/errata/RHSA-2026:1838 (opens in a new tab)

Affected software

Product	Affected	Fixed in
AlmaLinux 10image-builder	Affected <31-3.el10_1	Fixed in 31-3.el10_1

Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.

AI-suggested

A security update is available and should be applied to remediate this vulnerability. Systems running image-builder versions prior to 31-3.el10_1 on Red Hat Enterprise Linux 10 should be updated to version 31-3.el10_1 or later. Refer to the Red Hat advisory RHSA-2026:1838 and the update instructions at https://access.redhat.com/articles/11258 for detailed remediation steps.

Description

A moderate severity vulnerability (CVE-2025-58183) affects the image-builder tool used for creating customized OS artifacts. The flaw involves an unbounded memory allocation issue in the golang archive/tar package when parsing GNU sparse maps. This vulnerability is fixed in image-builder version 31-3.el10_1 for Red Hat Enterprise Linux 10. No known exploits are reported in the wild.

Impact

The vulnerability may allow a local user or process to trigger unbounded memory allocation during tar archive parsing, which could lead to denial of service or resource exhaustion on affected systems. The security impact is rated as Moderate by Red Hat. There are no known exploits in the wild at this time.

Summary

The image-builder utility, which relies on osbuild to create VM images and OSTree commits, is affected by a vulnerability in the golang archive/tar package. Specifically, an unbounded allocation occurs when parsing GNU sparse maps, potentially leading to resource exhaustion or denial of service. This issue is tracked as CVE-2025-58183 and has been addressed in image-builder version 31-3.el10_1 for Red Hat Enterprise Linux 10.

References

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