# CVE-2026-15789: buildah: The buildah package provides a tool for facilitating building OCI container images

CVE-2026-15789 is fixed in 3 products on 1 platform, first by ALSA-2026:70640, released September 23, 2026. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2026-15789
- Priority: High
- CVSS: 8.1 (Important)
- EPSS: 0.0031
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Sep 23, 2026

## Description

The buildah package provides a tool for facilitating building OCI container images. Among other things, buildah enables you to: Create a working container, either from scratch or using an image as a starting point; Create an image, either from a working container or using the instructions in a Dockerfile; Build both Docker and OCI images.  Security Fix(es):  * buildah: Go net/http: Unencrypted HTTP/2 connections vulnerable to Denial of Service (CVE-2026-56853)  * buildah: Go html/template: Cross-Site Scripting via pathological input (CVE-2026-56858)  * buildah: Go encoding/asn1: Denial of Service via excessive recursion in Unmarshal (CVE-2026-33818)  * buildah: golang net/url: Denial of Service from quadratic complexity in path resolution (CVE-2026-56860)  * buildah: Golang crypto/tls: Denial of Service via indefinite KeyUpdate messages (CVE-2026-56862)  For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | buildah RHEL 9 | 2:1.43.3-2.el9_8 | [RHSA-2026:70640](https://patchblox.com/security/data/fix/linux/rhsa-2026-70640.md) | Sep 24, 2026 |
| Linux | buildah almalinux 9 | 2:1.43.3-2.el9_8 | [ALSA-2026:70640](https://patchblox.com/security/data/fix/linux/alsa-2026-70640.md) | Sep 23, 2026 |
| Linux | buildah ol 9 | 2:1.43.3-2.0.1.el9_8 | [ELSA-2026-70640](https://patchblox.com/security/data/fix/linux/elsa-2026-70640.md) | Sep 24, 2026 |
| Linux | buildah rocky 9 | 2:1.43.3-2.el9_8 | [RLSA-2026:70640](https://patchblox.com/security/data/fix/linux/rlsa-2026-70640.md) | Sep 24, 2026 |
| Linux | buildah-tests RHEL 9 | 2:1.43.3-2.el9_8 | [RHSA-2026:70640](https://patchblox.com/security/data/fix/linux/rhsa-2026-70640.md) | Sep 24, 2026 |
| Linux | buildah-tests almalinux 9 | 2:1.43.3-2.el9_8 | [ALSA-2026:70640](https://patchblox.com/security/data/fix/linux/alsa-2026-70640.md) | Sep 23, 2026 |
| Linux | buildah-tests ol 9 | 2:1.43.3-2.0.1.el9_8 | [ELSA-2026-70640](https://patchblox.com/security/data/fix/linux/elsa-2026-70640.md) | Sep 24, 2026 |
| Linux | runfinch-finch amzn 2023 | 1.19.0-1.amzn2023.0.1 | [ALAS2023-2026-3140](https://patchblox.com/security/data/fix/linux/alas2023-2026-3140.md) | Sep 28, 2026 |

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Data as of 2026-11-09T13:31:49Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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