# CVE-2026-15028: Libarchive: heap overflow oob read while parsing a tar archive contains a pax extended header

> A heap overflow in Libarchive allows remote attackers to cause denial of service or execute arbitrary code via a crafted tar archive.

- **Severity:** Low 3.9 (`CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:L/I:N/A:L`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Local or same network only
- **Victim action needed:** A user has to click or open something
- **Fix available:** Yes
- **Published:** 10 Jul 2026
- **Updated:** 9 Oct 2026
- **Also known as:** AZL-92331, DEBIAN-CVE-2026-15028, ECHO-9c03-a5ae-1691, GHSA-p59g-85vj-3mvf, RHSA-2026:38279, UBUNTU-CVE-2026-15028

## What is CVE-2026-15028?

CVE-2026-15028 is a low-severity memory corruption vulnerability in Red Hat Cost Management On-Premise 1, published on 10 Jul 2026. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.

### Official description

A flaw was found in libarchive. This vulnerability allows a remote attacker to trigger a heap overflow by providing a specially crafted tar archive. The issue occurs during the parsing of a PAX extended header containing a malformed SUN.holesdata sparse-file attribute. Successful exploitation could lead to a denial of service, making the system unavailable, or potentially allow for arbitrary code execution, giving the attacker control over the affected system.

Weakness: CWE-122 (Heap-based Buffer Overflow), CWE-805 (Buffer Access with Incorrect Length Value)

## Which versions are affected by CVE-2026-15028?


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `bsdcat` | Red Hat:hummingbird:1 | All versions | 0:3.8.8-2.1.hum1 |
| `bsdcpio` | Red Hat:hummingbird:1 | All versions | 0:3.8.8-2.1.hum1 |
| `bsdtar` | Red Hat:hummingbird:1 | All versions | 0:3.8.8-2.1.hum1 |
| `bsdunzip` | Red Hat:hummingbird:1 | All versions | 0:3.8.8-2.1.hum1 |
| `libarchive` | Red Hat:hummingbird:1 | All versions | 0:3.8.8-2.1.hum1 |
| `libarchive-devel` | Red Hat:hummingbird:1 | All versions | 0:3.8.8-2.1.hum1 |

## How do I fix CVE-2026-15028?

Apply the vendor's patch.

## Is CVE-2026-15028 being exploited?

There is no known exploitation of CVE-2026-15028 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-15028 and fix it if it is affected.

What it is: CVE-2026-15028 is a low-severity memory corruption vulnerability in Red Hat Cost Management On-Premise 1, published on 10 Jul 2026. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.
Exploitation: There is no known exploitation of CVE-2026-15028 in the wild and no public exploit code.

Affected product: Red Hat Cost Management On-Premise 1. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-15028/ (Markdown: https://insights.sbomify.com/CVE-2026-15028/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-15028
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-15028
- OSV: https://osv.dev/vulnerability/CVE-2026-15028

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-15028/
Summaries are generated and may contain mistakes; the official description above is the record.