# libcurl4t64 8.18.0-1ubuntu2.3: libcurl4t64 8.18.0-1ubuntu2.3 for Ubuntu 26.04.1 LTS (resolute)

libcurl4t64 8.18.0-1ubuntu2.3, released June 24, 2026, fixes 5 CVEs in libcurl4t64. None of them is reported as exploited. Patch Radar priority: Urgent.

- Web page: https://patchblox.com/security/fix/linux/ubuntu-resolute-libcurl4t64-8.18.0-1ubuntu2.3
- Platform: Linux
- Released: Jun 24, 2026
- Priority: Urgent (Closes CVE-2026-11564, rated Critical)
- CVEs: 5, exploited: 0, on CISA KEV: 0

## Applies to

| Product | Release | Fixed in |
|---|---|---|
| [libcurl4t64](https://patchblox.com/security/data/product/linux/libcurl4t64.md) | Ubuntu 26.04.1 LTS (resolute) | 8.18.0-1ubuntu2.3 |

## CVEs this fix closes

| CVE | Priority | Title | CVSS | EPSS | Exploitation |
|---|---|---|---:|---:|---|
| [CVE-2026-11564](https://patchblox.com/security/data/cve/CVE-2026-11564.md) | Urgent | curl: libcurl keeps previously used connections in a connection pool for subsequent transfers to reuse if one of them match... | 9.1 | 0.0061 |  |
| [CVE-2026-11352](https://patchblox.com/security/data/cve/CVE-2026-11352.md) | High | curl: An issue in curl’s QUIC UDP receive function allows a malicious HTTP/3 server to trigger a remote denial of service a... | 7.5 | 0.0101 |  |
| [CVE-2026-11586](https://patchblox.com/security/data/cve/CVE-2026-11586.md) | High | curl: By default, curl automatically responds to WebSocket PING frames | 7.5 | 0.0086 |  |
| [CVE-2026-10536](https://patchblox.com/security/data/cve/CVE-2026-10536.md) | High | HTTP/2 stream-dependency tree UAF | 9.8 | 0.0060 |  |
| [CVE-2026-12064](https://patchblox.com/security/data/cve/CVE-2026-12064.md) | High | proto-default skips SSH verification | 7.5 | 0.0041 |  |

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Data as of 2026-11-12T13:55:20Z 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 Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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