# CVE-2026-3805: use after free in SMB connection reuse

CVE-2026-3805 is fixed in 13 products on 1 platform, first by curl 8.14.1-2ubuntu1.2, released March 11, 2026. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2026-3805
- Priority: High
- CVSS: 7.5 (Important)
- EPSS: 0.0090
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Mar 11, 2026
- Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-3805

## Description

This update for curl fixes the following issues:  - CVE-2026-1965: bad reuse of HTTP Negotiate connection (bsc#1259362). - CVE-2026-3783: token leak with redirect and netrc (bsc#1259363). - CVE-2026-3784: wrong proxy connection reuse with credentials (bsc#1259364). - CVE-2026-3805: use after free in SMB connection reuse (bsc#1259365).

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | curl Debian 13.5 (trixie) | 8.14.1-2+deb13u4 | [DEBIAN-CVE-2026-3805](https://patchblox.com/security/data/fix/linux/debian-cve-2026-3805.md) | Mar 11, 2026 |
| Linux | curl Debian 14 | 8.19.0-1 | [DEBIAN-CVE-2026-3805](https://patchblox.com/security/data/fix/linux/debian-cve-2026-3805.md) | Mar 11, 2026 |
| Linux | curl Ubuntu 25.10 (questing) | 8.14.1-2ubuntu1.2 | [curl 8.14.1-2ubuntu1.2](https://patchblox.com/security/data/fix/linux/ubuntu-questing-curl-8.14.1-2ubuntu1.2.md) | Mar 11, 2026 |
| Linux | curl amzn 2023 | 8.17.0-1.amzn2023.0.3 | [ALAS2023-2026-1699](https://patchblox.com/security/data/fix/linux/alas2023-2026-1699.md) | May 11, 2026 |
| Linux | curl opensuse-leap 15.6 | 8.14.1-150600.4.40.1 | [SUSE-SU-2026:0885-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-0885-1.md) | Mar 12, 2026 |
| Linux | curl opensuse-leap 16.0 | 8.14.1-160000.5.1 | [OPENSUSE-SU-2026:20404-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-20404-1.md) | Mar 20, 2026 |
| Linux | curl sles 15.6 | 8.14.1-150600.4.40.1 | [SUSE-SU-2026:0885-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-0885-1.md) | Mar 12, 2026 |
| Linux | curl sles 15.7 | 8.14.1-150700.7.14.1 | [SUSE-SU-2026:0903-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-0903-1.md) | Mar 17, 2026 |
| Linux | curl sles 16.0 | 8.14.1-160000.5.1 | [SUSE-SU-2026:20918-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-20918-1.md) | Mar 20, 2026 |
| Linux | curl-debuginfo amzn 2023 | 8.17.0-1.amzn2023.0.3 | [ALAS2023-2026-1699](https://patchblox.com/security/data/fix/linux/alas2023-2026-1699.md) | May 11, 2026 |
| Linux | curl-debugsource amzn 2023 | 8.17.0-1.amzn2023.0.3 | [ALAS2023-2026-1699](https://patchblox.com/security/data/fix/linux/alas2023-2026-1699.md) | May 11, 2026 |
| Linux | curl-mini sles 16.0 | 8.14.1-160000.5.1 | [SUSE-SU-2026:20918-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-20918-1.md) | Mar 20, 2026 |
| Linux | curl-minimal amzn 2023 | 8.17.0-1.amzn2023.0.3 | [ALAS2023-2026-1699](https://patchblox.com/security/data/fix/linux/alas2023-2026-1699.md) | May 11, 2026 |
| Linux | curl-minimal-debuginfo amzn 2023 | 8.17.0-1.amzn2023.0.3 | [ALAS2023-2026-1699](https://patchblox.com/security/data/fix/linux/alas2023-2026-1699.md) | May 11, 2026 |
| Linux | libcurl amzn 2023 | 8.17.0-1.amzn2023.0.3 | [ALAS2023-2026-1699](https://patchblox.com/security/data/fix/linux/alas2023-2026-1699.md) | May 11, 2026 |
| Linux | libcurl-debuginfo amzn 2023 | 8.17.0-1.amzn2023.0.3 | [ALAS2023-2026-1699](https://patchblox.com/security/data/fix/linux/alas2023-2026-1699.md) | May 11, 2026 |
| Linux | libcurl-devel amzn 2023 | 8.17.0-1.amzn2023.0.3 | [ALAS2023-2026-1699](https://patchblox.com/security/data/fix/linux/alas2023-2026-1699.md) | May 11, 2026 |
| Linux | libcurl-minimal amzn 2023 | 8.17.0-1.amzn2023.0.3 | [ALAS2023-2026-1699](https://patchblox.com/security/data/fix/linux/alas2023-2026-1699.md) | May 11, 2026 |
| Linux | libcurl-minimal-debuginfo amzn 2023 | 8.17.0-1.amzn2023.0.3 | [ALAS2023-2026-1699](https://patchblox.com/security/data/fix/linux/alas2023-2026-1699.md) | May 11, 2026 |
| Linux | libcurl3t64-gnutls Ubuntu 25.10 (questing) | 8.14.1-2ubuntu1.2 | [libcurl3t64-gnutls 8.14.1-2ubuntu1.2](https://patchblox.com/security/data/fix/linux/ubuntu-questing-libcurl3t64-gnutls-8.14.1-2ubuntu1.2.md) | Mar 11, 2026 |
| Linux | libcurl4t64 Ubuntu 25.10 (questing) | 8.14.1-2ubuntu1.2 | [libcurl4t64 8.14.1-2ubuntu1.2](https://patchblox.com/security/data/fix/linux/ubuntu-questing-libcurl4t64-8.14.1-2ubuntu1.2.md) | Mar 11, 2026 |

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Data as of 2026-11-09T01:18:40Z 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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