RUSTSEC-2026-0098Published

rustls webpki Name Constraints URI Validation Bypass

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cve-program · CVE-2026-93600

Published

rustls-webpki (rustls/webpki) versions 0.101.0 through 0.103.11 and 0.104.0-alpha releases before 0.104.0-alpha.6 ignore X.509 name constraints that apply to URI names, causing such constraints to be accepted rather than enforced. Because name constraints are restrictions on otherwise properly issued certificates, the flaw is only reachable after successful signature verification and requires a misissued certificate to exploit; the library also provides no API for asserting URI names, and URI name constraints are otherwise unimplemented. Versions 0.103.12 and 0.104.0-alpha.6 reject URI name constraints unconditionally.

Source published: 18 Sep 2026 13:20:10 UTC
Source modified: 21 Sep 2026 20:51:59 UTC
Saved here: 23 Oct 2026 15:48:27 UTC
Source terms: CVE Program Terms of Use

Original source record · Cite this exact observation · Complete original publisher JSON

Source: cve-program · CVE Program Terms of Use. The publisher's wording is preserved. ChangeIntel groups the information and labels changes. The JSON record includes additional source fields.

CVSS 4.0 · 2.1 CVSS:4.0/AV:N/AC:H/AT:P/PR:H/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N

CVSS 3.1 · 2.2 CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:N/I:L/A:N

euvd · EUVD-2026-82895

Published

Additional publisher context

EUVD source date text has no stated timezone and is retained without inventing a UTC instant. Related bulletin membership is not an alias, common cause or applicability claim. A missing vector with a zero score is treated as unrated. Complete vendor/product and underlying source evidence remains in the original JSON.

Original publisher date fields

datePublished: Sep 18, 2026, 1:20:10 PM

dateUpdated: Sep 21, 2026, 8:51:59 PM

9 related source bulletins · separate from aliases

msrc_CVE-2026-93600: rustls webpki Name Constraints URI Validation Bypass

CVE-2026-93600

openSUSE-SU-2026:11936-1: python313-tokenizers-0.23.2-1.1 on GA media

CVE-2026-93599 · CVE-2026-93600 · CVE-2026-93601 · CVE-2026-93602

SUSE-SU-2026:24014-1: Security update for rustup

CVE-2024-12224 · CVE-2025-58160 · CVE-2026-25541 · CVE-2026-25727 · CVE-2026-41676 · CVE-2026-41677 · CVE-2026-41678 · CVE-2026-41681 · CVE-2026-41898 · CVE-2026-42327 · CVE-2026-44662 · CVE-2026-45784 · CVE-2026-93599 · CVE-2026-93600 · CVE-2026-93601 · CVE-2026-93602

openSUSE-SU-2026:22175-1: Security update for aws-nitro-enclaves-cli

CVE-2026-93599 · CVE-2026-93600 · CVE-2026-93601 · CVE-2026-93602

openSUSE-SU-2026:21982-1: Security update for sccache

CVE-2024-12224 · CVE-2026-25541 · CVE-2026-25727 · CVE-2026-41676 · CVE-2026-41677 · CVE-2026-41678 · CVE-2026-41681 · CVE-2026-41898 · CVE-2026-42327 · CVE-2026-44662 · CVE-2026-45784 · CVE-2026-66746 · CVE-2026-66754 · CVE-2026-67181 · CVE-2026-67182 · CVE-2026-93599 · CVE-2026-93600 · CVE-2026-93601 · CVE-2026-93602

SUSE-SU-2026:24467-1: Security update for aws-nitro-enclaves-cli

CVE-2026-93599 · CVE-2026-93600 · CVE-2026-93601 · CVE-2026-93602

openSUSE-SU-2026:22189-1: Security update for shadowsocks-rust, shadowsocks-libev

CVE-2025-3416 · CVE-2026-25541 · CVE-2026-93599 · CVE-2026-93600 · CVE-2026-93601 · CVE-2026-93602

openSUSE-SU-2026:22016-1: Security update for rustup

SUSE-SU-2026:23983-1: Security update for sccache

Source published: Sep 18, 2026, 1:20:10 PM (timezone not stated)
Source modified: Sep 21, 2026, 8:51:59 PM (timezone not stated)
Saved here: 11 Nov 2026 17:05:40 UTC
Source terms: ENISA EUVD · source terms and attribution apply

Original source record · Cite this exact observation · Complete original publisher JSON

Source: euvd · ENISA EUVD · source terms and attribution apply. The publisher's wording is preserved. ChangeIntel groups the information and labels changes. The JSON record includes additional source fields.

EUVD CVSS 4.0 · 2.1 CVSS:4.0/AV:N/AC:H/AT:P/PR:H/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N

nvd · CVE-2026-93600

Published

Additional publisher context

NVD analysis and CPE criteria are source context, not proof that a package or your environment is affected. Complete affected data, logical configurations and SSVC are retained in the original JSON.

Source analysis status: Awaiting Analysis

Weakness classifications: CWE-295

Original publisher date fields

published: 2026-09-18T14:19:11.563

lastModified: 2026-09-22T20:25:55.870

Source published: 18 Sep 2026 14:19:11 UTC
Source modified: 22 Sep 2026 20:25:55 UTC
Saved here: 25 Oct 2026 16:19:28 UTC
Source terms: NIST NVD usage terms; underlying source attribution retained

Original source record · Cite this exact observation · Complete original publisher JSON

Source: nvd · NIST NVD usage terms; underlying source attribution retained. The publisher's wording is preserved. ChangeIntel groups the information and labels changes. The JSON record includes additional source fields.

CVSS 4.0 · [email protected] · Secondary · 2.1 CVSS:4.0/AV:N/AC:H/AT:P/PR:H/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

CVSS 3.1 · [email protected] · Secondary · 2.2 CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:N/I:L/A:N

osv · GHSA-965h-392x-2mh5

Published

Source published: 16 Apr 2026 21:16:22 UTC
Source modified: 19 Sep 2026 03:55:32 UTC
Saved here: 24 Oct 2026 13:19:54 UTC
Source terms: GitHub Advisory Database · CC-BY-4.0

Original source record · Cite this exact observation · Complete original publisher JSON

Source: osv · GitHub Advisory Database · CC-BY-4.0. The publisher's wording is preserved. ChangeIntel groups the information and labels changes. The JSON record includes additional source fields.

CVSS_V3 · CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:N/I:L/A:N

Publisher rating · LOW

osv · RUSTSEC-2026-0098

Published

Name constraints for URI names were ignored and therefore accepted. Note this library does not provide an API for asserting URI names, and URI name constraints are otherwise not implemented. URI name constraints are now rejected unconditionally. Since name constraints are restrictions on otherwise properly-issued certificates, this bug is reachable only after signature verification and requires misissuance to exploit. This vulnerability is identified as [GHSA-965h-392x-2mh5](https://github.com/rustls/webpki/security/advisories/GHSA-965h-392x-2mh5). Thank you to [@1seal](https://github.com/1seal) for the report.

Source published: 14 Apr 2026 12:00:00 UTC
Source modified: 19 Sep 2026 08:42:27 UTC
Saved here: 24 Oct 2026 13:19:54 UTC
Source terms: OSV · upstream source license applies

Original source record · Cite this exact observation · Complete original publisher JSON

Source: osv · OSV · upstream source license applies. The publisher's wording is preserved. ChangeIntel groups the information and labels changes. The JSON record includes additional source fields.