# CVE-2026-93599: rustls-webpki before 0.103.13 Panic via empty BIT STRING

CVE-2026-93599 is fixed in 13 products on 1 platform, first by RHSA-2026:85848, released September 18, 2026. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2026-93599
- Priority: High
- CVSS: 7.5 (Important)
- EPSS: 0.0035
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Sep 18, 2026
- Weakness: Integer Underflow (Wrap or Wraparound)
- Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-93599

## Description

rustls-webpki: Denial of service via panic on malformed CRL BIT STRING (bsc#1282250).

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | amazon-efs-utils amzn 2023 | 3.3.5-1.amzn2023 | [ALAS2023-2026-3378](https://patchblox.com/security/data/fix/linux/alas2023-2026-3378.md) | Nov 10, 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 | aws-workload-credentials-provider amzn 2023 | 3.1.2-1.amzn2023 | [ALAS2023-2026-3375](https://patchblox.com/security/data/fix/linux/alas2023-2026-3375.md) | Nov 10, 2026 |
| Linux | aws-workload-credentials-provider-debuginfo amzn 2023 | 3.1.2-1.amzn2023 | [ALAS2023-2026-3375](https://patchblox.com/security/data/fix/linux/alas2023-2026-3375.md) | Nov 10, 2026 |
| Linux | aws-workload-credentials-provider-debugsource amzn 2023 | 3.1.2-1.amzn2023 | [ALAS2023-2026-3375](https://patchblox.com/security/data/fix/linux/alas2023-2026-3375.md) | Nov 10, 2026 |
| Linux | goose RHEL 10 | 1.45.0-1.el10_2 | [RHSA-2026:80765](https://patchblox.com/security/data/fix/linux/rhsa-2026-80765.md) | Oct 13, 2026 |
| Linux | goose RHEL 9 | 0:1.45.0-1.el9_8 | [RHSA-2026:80764](https://patchblox.com/security/data/fix/linux/rhsa-2026-80764.md) | Oct 12, 2026 |
| Linux | rust-rustls-webpki Debian 14 | 0.103.13+ds-1 | [DEBIAN-CVE-2026-93599](https://patchblox.com/security/data/fix/linux/debian-cve-2026-93599.md) | Sep 19, 2026 |
| Linux | rust-sequoia-sq RHEL 10 | 1.4.0.1-4.el10_2 | [RHSA-2026:85848](https://patchblox.com/security/data/fix/linux/rhsa-2026-85848.md) | Sep 18, 2026 |
| Linux | rust-sequoia-sq rocky 10 | 0:1.4.0.1-4.el10_2 | [RLSA-2026:85848](https://patchblox.com/security/data/fix/linux/rlsa-2026-85848.md) | Nov 7, 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 almalinux 10 | 1.4.0.1-4.el10_2 | [ALSA-2026:85848](https://patchblox.com/security/data/fix/linux/alsa-2026-85848.md) | Nov 7, 2026 |
| Linux | sequoia-sq ol 10 | 0:1.4.0.1-4.0.1.el10_2 | [ELSA-2026-85848](https://patchblox.com/security/data/fix/linux/elsa-2026-85848.md) | Nov 7, 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 2026-11-11T01:43:54Z 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

Free to use with attribution: show "Data: Patchblox Patch Radar" with a link to https://patchblox.com/security/patch-radar. Terms, including what needs a written agreement: https://patchblox.com/security/patch-radar/use-the-data

Product names, logos and trademarks shown on Patch Radar belong to their respective owners. They are used only to identify the software each security fix applies to and to help readers find their platform. Their use does not imply any affiliation with, or endorsement by, those owners, and Patchblox is not affiliated with any of them.