# CVE-2026-88839: Busybox: busybox: passwd/group parser writes heap pointers out of bounds due to stale tokenize() endpoint

CVE-2026-88839 is fixed in busybox on 1 platform, first by SUSE-SU-2026:4760-1, released November 7, 2026. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2026-88839
- Priority: Routine
- CVSS: 6.7 (Moderate)
- EPSS: 0.0012
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Oct 1, 2026
- Weakness: Out-of-bounds Write
- Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-88839

## Description

This update for busybox fixes the following issues:  - CVE-2026-88830: unit confusion in TLS Montgomery reduction buffer allocation causes a pre-authentication heap buffer   overflow when processing a crafted `ClientKeyExchange` message (bsc#1282575). - CVE-2026-88831: httpd silently fails open when IP deny rules contain invalid CIDR prefix lengths (bsc#1282550). - CVE-2026-88832: romfs volume ID parsing uses unbounded `strlen` on attacker-controlled metadata and allows for a heap   buffer overflow when crafted filesystem images are processed (bsc#1282576). - CVE-2026-88835: dpkg read_package_field() steps past NUL terminator, causing out-of-bounds read on malformed .deb   packages (bsc#1282551). - CVE-2026-88837: httpd misidentifies yescrypt password hashes as plaintext (bsc#1282552). - CVE-2026-88839: passwd/group parser writes heap pointers out of bounds due to stale tokenize() endpoint (bsc#1282568). - CVE-2026-88841: OOB read and silent memory corruption of the status file due to `write_status_file()` failing to reset   the `field_start` cursor between package stanzas (bsc#1282653).

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | busybox opensuse-leap 16.0 | 1.37.0-160000.8.1 | [OPENSUSE-SU-2026:22067-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-22067-1.md) | Nov 7, 2026 |
| Linux | busybox sles 15.7 | 1.37.0-150700.18.24.1 | [SUSE-SU-2026:4760-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-4760-1.md) | Nov 7, 2026 |
| Linux | busybox sles 16.0 | 1.37.0-160000.8.1 | [SUSE-SU-2026:24215-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-24215-1.md) | Nov 7, 2026 |

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Data as of 2026-11-10T07:50:38Z 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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