# CVE-2026-53689: libnfs: libnfs through 6.0.2 before 55c18ea does not validate a string size, leading to an integer overflow during a connecti... CVE-2026-53689 is fixed in 8 products on 1 platform, first by DEBIAN-CVE-2026-53689, released June 10, 2026. It is not reported as exploited. Patch Radar priority: High. - Web page: https://patchblox.com/security/cve/CVE-2026-53689 - Priority: High - CVSS: 7.1 (high) - EPSS: 0.0021 - CISA KEV: not listed - Exploited (vendor report): no - Publicly disclosed: no - Published: Jun 10, 2026 ## Description libnfs through 6.0.2 before 55c18ea does not validate a string size, leading to an integer overflow during a connection to a crafted NFS server. This occurs in libnfs_zdr_string in lib/libnfs-zdr.c. ## Where it's fixed | Platform | Product | Fixed in | Fix | Released | |---|---|---|---|---| | Linux | libnfs Debian 12.15 (bookworm) | 4.0.0-1+deb12u1 | [DEBIAN-CVE-2026-53689](https://patchblox.com/security/data/fix/linux/debian-cve-2026-53689.md) | Jun 10, 2026 | | Linux | libnfs Debian 13.5 (trixie) | 5.0.2-1+deb13u1 | [DEBIAN-CVE-2026-53689](https://patchblox.com/security/data/fix/linux/debian-cve-2026-53689.md) | Jun 10, 2026 | | Linux | libnfs Debian 14 | 5.0.2-1.1 | [DEBIAN-CVE-2026-53689](https://patchblox.com/security/data/fix/linux/debian-cve-2026-53689.md) | Jun 10, 2026 | | Linux | libnfs Fedora 43 | 6.0.2-9.fc43 | [FEDORA-2026-2E196B6FA5](https://patchblox.com/security/data/fix/linux/fedora-2026-2e196b6fa5.md) | Aug 10, 2026 | | Linux | libnfs amzn 2023 | 4.0.0-4.amzn2023.0.3 | [ALAS2023-2026-1855](https://patchblox.com/security/data/fix/linux/alas2023-2026-1855.md) | Jun 22, 2026 | | Linux | libnfs opensuse-leap 16.0 | 5.0.3-160000.4.1 | [OPENSUSE-SU-2026:21055-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-21055-1.md) | Jun 25, 2026 | | Linux | libnfs sles 15.6 | 1.11.0-150000.3.3.1 | [SUSE-SU-2026:2760-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-2760-1.md) | Jul 6, 2026 | | Linux | libnfs sles 15.7 | 1.11.0-150000.3.3.1 | [SUSE-SU-2026:2760-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-2760-1.md) | Jul 6, 2026 | | Linux | libnfs sles 16.0 | 5.0.3-160000.4.1 | [SUSE-SU-2026:22363-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-22363-1.md) | Jun 25, 2026 | | Linux | libnfs-debuginfo Fedora 43 | 6.0.2-9.fc43 | [FEDORA-2026-2E196B6FA5](https://patchblox.com/security/data/fix/linux/fedora-2026-2e196b6fa5.md) | Aug 10, 2026 | | Linux | libnfs-debuginfo amzn 2023 | 4.0.0-4.amzn2023.0.3 | [ALAS2023-2026-1855](https://patchblox.com/security/data/fix/linux/alas2023-2026-1855.md) | Jun 22, 2026 | | Linux | libnfs-debugsource Fedora 43 | 6.0.2-9.fc43 | [FEDORA-2026-2E196B6FA5](https://patchblox.com/security/data/fix/linux/fedora-2026-2e196b6fa5.md) | Aug 10, 2026 | | Linux | libnfs-debugsource amzn 2023 | 4.0.0-4.amzn2023.0.3 | [ALAS2023-2026-1855](https://patchblox.com/security/data/fix/linux/alas2023-2026-1855.md) | Jun 22, 2026 | | Linux | libnfs-devel Fedora 43 | 6.0.2-9.fc43 | [FEDORA-2026-2E196B6FA5](https://patchblox.com/security/data/fix/linux/fedora-2026-2e196b6fa5.md) | Aug 10, 2026 | | Linux | libnfs-devel amzn 2023 | 4.0.0-4.amzn2023.0.3 | [ALAS2023-2026-1855](https://patchblox.com/security/data/fix/linux/alas2023-2026-1855.md) | Jun 22, 2026 | | Linux | libnfs-utils Fedora 43 | 6.0.2-9.fc43 | [FEDORA-2026-2E196B6FA5](https://patchblox.com/security/data/fix/linux/fedora-2026-2e196b6fa5.md) | Aug 10, 2026 | | Linux | libnfs-utils Ubuntu 22.04.1 LTS (jammy) | 4.0.0-1ubuntu0.1 | [libnfs-utils 4.0.0-1ubuntu0.1](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-libnfs-utils-4.0.0-1ubuntu0.1.md) | Jun 24, 2026 | | Linux | libnfs-utils Ubuntu 24.04.5 LTS (noble) | 5.0.2-1ubuntu0.24.04.1 | [libnfs-utils 5.0.2-1ubuntu0.24.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-noble-libnfs-utils-5.0.2-1ubuntu0.24.04.1.md) | Jun 24, 2026 | | Linux | libnfs-utils Ubuntu 25.10 (questing) | 5.0.2-1ubuntu0.25.10.1 | [libnfs-utils 5.0.2-1ubuntu0.25.10.1](https://patchblox.com/security/data/fix/linux/ubuntu-questing-libnfs-utils-5.0.2-1ubuntu0.25.10.1.md) | Jun 24, 2026 | | Linux | libnfs-utils Ubuntu 26.04.1 LTS (resolute) | 5.0.2-1ubuntu1.1 | [libnfs-utils 5.0.2-1ubuntu1.1](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-libnfs-utils-5.0.2-1ubuntu1.1.md) | Jun 10, 2026 | | Linux | libnfs-utils amzn 2023 | 4.0.0-4.amzn2023.0.3 | [ALAS2023-2026-1855](https://patchblox.com/security/data/fix/linux/alas2023-2026-1855.md) | Jun 22, 2026 | | Linux | libnfs-utils-debuginfo Fedora 43 | 6.0.2-9.fc43 | [FEDORA-2026-2E196B6FA5](https://patchblox.com/security/data/fix/linux/fedora-2026-2e196b6fa5.md) | Aug 10, 2026 | | Linux | libnfs-utils-debuginfo amzn 2023 | 4.0.0-4.amzn2023.0.3 | [ALAS2023-2026-1855](https://patchblox.com/security/data/fix/linux/alas2023-2026-1855.md) | Jun 22, 2026 | | Linux | libnfs13 Ubuntu 22.04.1 LTS (jammy) | 4.0.0-1ubuntu0.1 | [libnfs13 4.0.0-1ubuntu0.1](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-libnfs13-4.0.0-1ubuntu0.1.md) | Jun 24, 2026 | | Linux | libnfs14 Ubuntu 24.04.5 LTS (noble) | 5.0.2-1ubuntu0.24.04.1 | [libnfs14 5.0.2-1ubuntu0.24.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-noble-libnfs14-5.0.2-1ubuntu0.24.04.1.md) | Jun 24, 2026 | | Linux | libnfs14 Ubuntu 25.10 (questing) | 5.0.2-1ubuntu0.25.10.1 | [libnfs14 5.0.2-1ubuntu0.25.10.1](https://patchblox.com/security/data/fix/linux/ubuntu-questing-libnfs14-5.0.2-1ubuntu0.25.10.1.md) | Jun 24, 2026 | | Linux | libnfs14 Ubuntu 26.04.1 LTS (resolute) | 5.0.2-1ubuntu1.1 | [libnfs14 5.0.2-1ubuntu1.1](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-libnfs14-5.0.2-1ubuntu1.1.md) | Jun 10, 2026 | --- Data as of 2026-11-08T06:59:42Z UTC. 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