# RHSA-2026:93583: libsoup3 security update

RHSA-2026:93583, released September 3, 2026, fixes 6 CVEs in libsoup3 (version 3.6.5-3.el10_0.19). None of them is reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/fix/linux/rhsa-2026-93583
- Platform: Linux
- Released: Sep 3, 2026
- Priority: High (Closes CVE-2026-102559, high severity)
- CVEs: 6, exploited: 0, on CISA KEV: 0
- Vendor advisory: https://access.redhat.com/errata/RHSA-2026:93583

## Applies to

| Product | Release | Fixed in |
|---|---|---|
| [libsoup3](https://patchblox.com/security/data/product/linux/libsoup3.md) | RHEL 10 | 3.6.5-3.el10_0.19 |

## CVEs this fix closes

| CVE | Priority | Title | CVSS | EPSS | Exploitation |
|---|---|---|---:|---:|---|
| [CVE-2026-102559](https://patchblox.com/security/data/cve/CVE-2026-102559.md) | High | Libsoup: libsoup: heap buffer overflow during websocket client-frame masking | 8.6 | 0.0063 |  |
| [CVE-2026-102558](https://patchblox.com/security/data/cve/CVE-2026-102558.md) | High | Libsoup: libsoup: heap buffer overflow during websocket receive-buffer growth | 8.6 | 0.0060 |  |
| [CVE-2026-102560](https://patchblox.com/security/data/cve/CVE-2026-102560.md) | High | Libsoup: libsoup: heap buffer overflow during outgoing permessage-deflate buffer growth | 8.6 | 0.0052 |  |
| [CVE-2026-102555](https://patchblox.com/security/data/cve/CVE-2026-102555.md) | High | Libsoup: libsoup: heap buffer overflow via uninitialized length in data-uri base64 decoding | 8.2 | 0.0048 |  |
| [CVE-2026-102556](https://patchblox.com/security/data/cve/CVE-2026-102556.md) | High | Libsoup: libsoup: heap buffer overflow from websocket pong signal type confusion | 8.6 | 0.0047 |  |
| [CVE-2026-102557](https://patchblox.com/security/data/cve/CVE-2026-102557.md) | High | Libsoup: libsoup: heap buffer overflow during websocket message reassembly | 8.6 | 0.0047 |  |

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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 Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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