# CVE-2026-93601: rustls webpki 0.101.0 before 0.103.12 Name Constraint Bypass CVE-2026-93601 is fixed in 16 products on 1 platform, first by DEBIAN-CVE-2026-93601, released September 19, 2026. It is not reported as exploited. Patch Radar priority: Routine. - Web page: https://patchblox.com/security/cve/CVE-2026-93601 - Priority: Routine - CVSS: 2.2 (Low) - EPSS: 0.0020 - CISA KEV: not listed - Exploited (vendor report): no - Publicly disclosed: no - Published: Sep 18, 2026 - Weakness: Improper Certificate Validation - Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-93601 ## Description rustls-webpki (the Rust webpki fork used by rustls) versions >= 0.101.0 and prior to 0.103.12 and 0.104.0-alpha.6 incorrectly accepted permitted-subtree DNS name constraints for certificates asserting a wildcard name. For example, a name constraint of accept.example.com was treated as satisfied by a certificate for *.example.com, which could feasibly assert reject.example.com — a name outside the permitted subtree. Because name constraints are restrictions applied to otherwise properly issued certificates, the issue is only reachable after signature verification succeeds and requires a misissued wildcard certificate to exploit. ## Where it's fixed | Platform | Product | Fixed in | Fix | Released | |---|---|---|---|---| | Linux | asciinema Fedora 43 | 3.0.0-8.fc43 | [FEDORA-2026-050BC124DF](https://patchblox.com/security/data/fix/linux/fedora-2026-050bc124df.md) | Nov 7, 2026 | | Linux | asciinema-debuginfo Fedora 43 | 3.0.0-8.fc43 | [FEDORA-2026-050BC124DF](https://patchblox.com/security/data/fix/linux/fedora-2026-050bc124df.md) | Nov 7, 2026 | | Linux | asciinema-debugsource Fedora 43 | 3.0.0-8.fc43 | [FEDORA-2026-050BC124DF](https://patchblox.com/security/data/fix/linux/fedora-2026-050bc124df.md) | Nov 7, 2026 | | Linux | aws-nitro-enclaves-cli opensuse-leap 16.0 | 1.5.2~git0.1c496ed-160000.1.1 | [OPENSUSE-SU-2026:22175-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-22175-1.md) | Nov 7, 2026 | | Linux | aws-nitro-enclaves-cli sles 15.6 | 1.5.2~git0.1c496ed-150600.10.18.1 | [SUSE-SU-2026:5066-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-5066-1.md) | Nov 7, 2026 | | Linux | aws-nitro-enclaves-cli sles 15.7 | 1.5.2~git0.1c496ed-150600.10.18.1 | [SUSE-SU-2026:5066-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-5066-1.md) | Nov 7, 2026 | | Linux | aws-nitro-enclaves-cli sles 16.0 | 1.5.2~git0.1c496ed-160000.1.1 | [SUSE-SU-2026:24467-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-24467-1.md) | Nov 7, 2026 | | Linux | fractal Fedora 43 | 14.3-1.fc43 | [FEDORA-2026-DB5DD4BC2F](https://patchblox.com/security/data/fix/linux/fedora-2026-db5dd4bc2f.md) | Nov 7, 2026 | | Linux | fractal-debuginfo Fedora 43 | 14.3-1.fc43 | [FEDORA-2026-DB5DD4BC2F](https://patchblox.com/security/data/fix/linux/fedora-2026-db5dd4bc2f.md) | Nov 7, 2026 | | Linux | fractal-debugsource Fedora 43 | 14.3-1.fc43 | [FEDORA-2026-DB5DD4BC2F](https://patchblox.com/security/data/fix/linux/fedora-2026-db5dd4bc2f.md) | Nov 7, 2026 | | Linux | ntpd-rs Fedora 43 | 1.7.2-3.fc43 | [FEDORA-2026-A9929D5B4B](https://patchblox.com/security/data/fix/linux/fedora-2026-a9929d5b4b.md) | Nov 7, 2026 | | Linux | ntpd-rs-debuginfo Fedora 43 | 1.7.2-3.fc43 | [FEDORA-2026-A9929D5B4B](https://patchblox.com/security/data/fix/linux/fedora-2026-a9929d5b4b.md) | Nov 7, 2026 | | Linux | ntpd-rs-debugsource Fedora 43 | 1.7.2-3.fc43 | [FEDORA-2026-A9929D5B4B](https://patchblox.com/security/data/fix/linux/fedora-2026-a9929d5b4b.md) | Nov 7, 2026 | | Linux | rust-rustls-webpki Debian 14 | 0.103.13+ds-1 | [DEBIAN-CVE-2026-93601](https://patchblox.com/security/data/fix/linux/debian-cve-2026-93601.md) | Sep 19, 2026 | | Linux | rustup opensuse-leap 16.0 | 1.29.1~0-160000.1.1 | [OPENSUSE-SU-2026:22016-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-22016-1.md) | Oct 2, 2026 | | Linux | rustup sles 16.0 | 1.29.1~0-160000.1.1 | [SUSE-SU-2026:24014-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-24014-1.md) | Oct 2, 2026 | | Linux | sccache opensuse-leap 16.0 | 0.18.0~2-160000.1.1 | [OPENSUSE-SU-2026:21982-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-21982-1.md) | Sep 30, 2026 | | Linux | sccache sles 16.0 | 0.18.0~2-160000.1.1 | [SUSE-SU-2026:23983-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-23983-1.md) | Sep 30, 2026 | | Linux | sequoia-sq opensuse-leap 16.0 | 1.5.0-bp160.1.1 | [OPENSUSE-RU-2026:22132-1](https://patchblox.com/security/data/fix/linux/opensuse-ru-2026-22132-1.md) | Nov 7, 2026 | | Linux | shadowsocks-libev opensuse-leap 16.0 | 3.3.6-bp160.3.1 | [OPENSUSE-SU-2026:22189-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-22189-1.md) | Nov 7, 2026 | | Linux | shadowsocks-rust opensuse-leap 16.0 | 1.25.0-bp160.1.1 | [OPENSUSE-SU-2026:22189-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-22189-1.md) | Nov 7, 2026 | --- Data as of 2026-11-09T01:18:40Z UTC. 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