# RLSA-2026:42733: glibc security update

RLSA-2026:42733, released July 22, 2026, fixes 3 CVEs in glibc (version 0:2.28-251.el8_10.40). None of them is reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/fix/linux/rlsa-2026-42733
- Platform: Linux
- Released: Jul 22, 2026
- Priority: High (Closes CVE-2026-5928, high severity)
- CVEs: 3, exploited: 0, on CISA KEV: 0
- Vendor advisory: https://errata.rockylinux.org/RLSA-2026:42733

## Applies to

| Product | Release | Fixed in |
|---|---|---|
| [glibc](https://patchblox.com/security/data/product/linux/glibc.md) | rocky 8 | 0:2.28-251.el8_10.40 |

## CVEs this fix closes

| CVE | Priority | Title | CVSS | EPSS | Exploitation |
|---|---|---|---:|---:|---|
| [CVE-2026-5928](https://patchblox.com/security/data/cve/CVE-2026-5928.md) | High | Static buffer overflow in deprecated nis_local_principal | 7.5 | 0.0037 |  |
| [CVE-2026-5435](https://patchblox.com/security/data/cve/CVE-2026-5435.md) | High | Potential buffer overflow in ns_sprintrrf TSIG handling path | 8.6 | 0.0024 |  |
| [CVE-2026-6238](https://patchblox.com/security/data/cve/CVE-2026-6238.md) | Routine | compat-libpthread-nonshared: The glibc packages provide the standard C libraries (libc), POSIX thread libraries (libpthread), standard math librar... | 6.5 | 0.0036 |  |

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Data as of 2026-11-07T18:46:35Z 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 Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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