# CVE-2026-6429: netrc credential leak with reused proxy connection CVE-2026-6429 is fixed in 10 products on 1 platform, first by curl 8.18.0-1ubuntu2.1, released April 29, 2026. It is not reported as exploited. Patch Radar priority: Routine. - Web page: https://patchblox.com/security/cve/CVE-2026-6429 - Priority: Routine - CVSS: 6.5 (Moderate) - EPSS: 0.0052 - CISA KEV: not listed - Exploited (vendor report): no - Publicly disclosed: no - Published: Apr 29, 2026 - Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-6429 ## Description The curl packages provide the libcurl library and the curl utility for downloading files from servers using various protocols, including HTTP, FTP, and LDAP. Security Fix(es): * curl: curl: Proxy credential disclosure via redirects to unauthenticated proxies (CVE-2026-6253) * curl: libcurl: Authentication bypass due to incorrect HTTP Negotiate connection reuse (CVE-2026-5545) * curl: libcurl: Credential leak via reused proxy connection during HTTP redirects (CVE-2026-6429) * curl: libcurl: Information disclosure via incorrect Proxy-Authorization header reuse (CVE-2026-7168) * libcurl: libcurl: Use-after-free vulnerability leading to Denial of Service (CVE-2026-10536) For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section. ## Where it's fixed | Platform | Product | Fixed in | Fix | Released | |---|---|---|---|---| | Linux | curl Debian 13.5 (trixie) | 8.14.1-2+deb13u4 | [DEBIAN-CVE-2026-6429](https://patchblox.com/security/data/fix/linux/debian-cve-2026-6429.md) | May 15, 2026 | | Linux | curl Debian 14 | 8.20.0~rc3-1 | [DEBIAN-CVE-2026-6429](https://patchblox.com/security/data/fix/linux/debian-cve-2026-6429.md) | May 15, 2026 | | Linux | curl RHEL 10 | 8.12.1-4.el10_2.7 | [RHSA-2026:80512](https://patchblox.com/security/data/fix/linux/rhsa-2026-80512.md) | Jul 3, 2026 | | Linux | curl Ubuntu 22.04.1 LTS (jammy) | 7.81.0-1ubuntu1.24 | [curl 7.81.0-1ubuntu1.24](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-curl-7.81.0-1ubuntu1.24.md) | May 15, 2026 | | Linux | curl Ubuntu 24.04.5 LTS (noble) | 8.5.0-2ubuntu10.9 | [curl 8.5.0-2ubuntu10.9](https://patchblox.com/security/data/fix/linux/ubuntu-noble-curl-8.5.0-2ubuntu10.9.md) | May 15, 2026 | | Linux | curl Ubuntu 25.10 (questing) | 8.14.1-2ubuntu1.3 | [curl 8.14.1-2ubuntu1.3](https://patchblox.com/security/data/fix/linux/ubuntu-questing-curl-8.14.1-2ubuntu1.3.md) | May 15, 2026 | | Linux | curl Ubuntu 26.04.1 LTS (resolute) | 8.18.0-1ubuntu2.1 | [curl 8.18.0-1ubuntu2.1](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-curl-8.18.0-1ubuntu2.1.md) | Apr 29, 2026 | | Linux | curl almalinux 10 | 8.12.1-4.el10_2.7 | [ALSA-2026:80512](https://patchblox.com/security/data/fix/linux/alsa-2026-80512.md) | Nov 7, 2026 | | Linux | curl ol 10 | 0:8.12.1-4.el10_2.7 | [ELSA-2026-80512](https://patchblox.com/security/data/fix/linux/elsa-2026-80512.md) | Nov 7, 2026 | | Linux | curl opensuse-leap 16.0 | 8.14.1-160000.6.1 | [OPENSUSE-SU-2026:20973-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-20973-1.md) | Jun 17, 2026 | | Linux | curl rocky 10 | 0:8.12.1-4.el10_2.7 | [RLSA-2026:80512](https://patchblox.com/security/data/fix/linux/rlsa-2026-80512.md) | Nov 7, 2026 | | Linux | curl sles 15.7 | 8.14.1-150700.7.23.1 | [SUSE-SU-2026:3798-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-3798-1.md) | Aug 25, 2026 | | Linux | curl sles 16.0 | 8.14.1-160000.6.1 | [SUSE-SU-2026:22156-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-22156-1.md) | Jun 17, 2026 | | Linux | curl-mini sles 16.0 | 8.14.1-160000.6.1 | [SUSE-SU-2026:22156-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-22156-1.md) | Jun 17, 2026 | | Linux | libcurl almalinux 10 | 8.12.1-4.el10_2.7 | [ALSA-2026:80512](https://patchblox.com/security/data/fix/linux/alsa-2026-80512.md) | Nov 7, 2026 | | Linux | libcurl ol 10 | 0:8.12.1-4.el10_2.7 | [ELSA-2026-80512](https://patchblox.com/security/data/fix/linux/elsa-2026-80512.md) | Nov 7, 2026 | | Linux | libcurl-devel almalinux 10 | 8.12.1-4.el10_2.7 | [ALSA-2026:80512](https://patchblox.com/security/data/fix/linux/alsa-2026-80512.md) | Nov 7, 2026 | | Linux | libcurl-devel ol 10 | 0:8.12.1-4.el10_2.7 | [ELSA-2026-80512](https://patchblox.com/security/data/fix/linux/elsa-2026-80512.md) | Nov 7, 2026 | | Linux | libcurl-minimal almalinux 10 | 8.12.1-4.el10_2.7 | [ALSA-2026:80512](https://patchblox.com/security/data/fix/linux/alsa-2026-80512.md) | Nov 7, 2026 | | Linux | libcurl-minimal ol 10 | 0:8.12.1-4.el10_2.7 | [ELSA-2026-80512](https://patchblox.com/security/data/fix/linux/elsa-2026-80512.md) | Nov 7, 2026 | | Linux | libcurl3-gnutls Ubuntu 22.04.1 LTS (jammy) | 7.81.0-1ubuntu1.24 | [libcurl3-gnutls 7.81.0-1ubuntu1.24](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-libcurl3-gnutls-7.81.0-1ubuntu1.24.md) | May 15, 2026 | | Linux | libcurl3-nss Ubuntu 22.04.1 LTS (jammy) | 7.81.0-1ubuntu1.24 | [libcurl3-nss 7.81.0-1ubuntu1.24](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-libcurl3-nss-7.81.0-1ubuntu1.24.md) | May 15, 2026 | | Linux | libcurl3t64-gnutls Ubuntu 24.04.5 LTS (noble) | 8.5.0-2ubuntu10.9 | [libcurl3t64-gnutls 8.5.0-2ubuntu10.9](https://patchblox.com/security/data/fix/linux/ubuntu-noble-libcurl3t64-gnutls-8.5.0-2ubuntu10.9.md) | May 15, 2026 | | Linux | libcurl3t64-gnutls Ubuntu 25.10 (questing) | 8.14.1-2ubuntu1.3 | [libcurl3t64-gnutls 8.14.1-2ubuntu1.3](https://patchblox.com/security/data/fix/linux/ubuntu-questing-libcurl3t64-gnutls-8.14.1-2ubuntu1.3.md) | May 15, 2026 | | Linux | libcurl3t64-gnutls Ubuntu 26.04.1 LTS (resolute) | 8.18.0-1ubuntu2.1 | [libcurl3t64-gnutls 8.18.0-1ubuntu2.1](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-libcurl3t64-gnutls-8.18.0-1ubuntu2.1.md) | Apr 29, 2026 | | Linux | libcurl4 Ubuntu 22.04.1 LTS (jammy) | 7.81.0-1ubuntu1.24 | [libcurl4 7.81.0-1ubuntu1.24](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-libcurl4-7.81.0-1ubuntu1.24.md) | May 15, 2026 | | Linux | libcurl4t64 Ubuntu 24.04.5 LTS (noble) | 8.5.0-2ubuntu10.9 | [libcurl4t64 8.5.0-2ubuntu10.9](https://patchblox.com/security/data/fix/linux/ubuntu-noble-libcurl4t64-8.5.0-2ubuntu10.9.md) | May 15, 2026 | | Linux | libcurl4t64 Ubuntu 25.10 (questing) | 8.14.1-2ubuntu1.3 | [libcurl4t64 8.14.1-2ubuntu1.3](https://patchblox.com/security/data/fix/linux/ubuntu-questing-libcurl4t64-8.14.1-2ubuntu1.3.md) | May 15, 2026 | | Linux | libcurl4t64 Ubuntu 26.04.1 LTS (resolute) | 8.18.0-1ubuntu2.1 | [libcurl4t64 8.18.0-1ubuntu2.1](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-libcurl4t64-8.18.0-1ubuntu2.1.md) | Apr 29, 2026 | --- Data as of 2026-11-08T00:53:09Z UTC. 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