EUVD-2026-82896
GHSA-27hx-xqx9-p6hq
Severity by source
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
Remotely reachable during TLS validation (AV:N) but gated on rare certificate misissuance under a name-constrained CA (AC:H); the attacker needs no victim privileges (PR:N), and impact is an integrity-only cert-scope bypass (I:L, C:N/A:N).
Primary rating from Vendor (VulnCheck).
CVSS VectorVendor: VulnCheck
Lifecycle Timeline
3DescriptionCVE.org
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.
AnalysisAI
Name-constraint bypass in rustls-webpki versions 0.101.0 through 0.103.11 and 0.104.0-alpha.1 through 0.104.0-alpha.5 allows a misissued wildcard certificate to escape permitted-subtree DNS name constraints, potentially permitting names outside the intended subtree. The flaw is reachable only after signature verification succeeds and requires a misissued wildcard certificate from a name-constrained CA, making real-world exploitation narrow and high-complexity (assessed CVSS 3.1 base 2.1, PR:N, AC:H). …
Unlock full vulnerability intelligence
- Risk assessment & exploitation conditions
- Attack chain visualization
- Remediation with exact patch versions
- Threat intelligence from 22 sources
- Personal watchlist & email alerts
Free forever · No credit card required
Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires two concrete preconditions that severely limit real-world risk: (1) a certificate chain that includes an intermediate CA carrying a permitted-subtree DNS name constraint (e.g. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | This is a genuinely low-priority, low-real-risk issue despite being a certificate-validation flaw. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | Upgrade rustls-webpki to 0.103.12 (for the 0.103.x line) or 0.104.0-alpha.6 (for the 0.104.0-alpha line); these are the vendor-released patched versions per the GHSA advisory. … Detailed patch versions, workarounds, and compensating controls in full report. |
Threat intelligence, references, and detailed analysis are available after sign-in.
Command injection via Windows CreateProcess argument parsing affects multiple language runtimes and tooling (Node.js, PH
In the standard library in Rust before 1.52.0, a double free can occur in the Vec::from_iter function if freeing the ele
In the standard library in Rust before 1.52.0, the Zip implementation can report an incorrect size due to an integer ove
library/std/src/net/parser.rs in Rust before 1.53.0 does not properly consider extraneous zero characters at the beginni
The Rust Programming Language Standard Library 1.34.x before 1.34.2 contains a stabilized method which, if overridden, c
In the standard library in Rust before 1.52.0, the Zip implementation calls __iterator_get_unchecked() more than once fo
In the standard library in Rust before 1.50.0, read_to_end() does not validate the return value from Read in an unsafe c
Cargo prior to Rust 1.26.0 may download the wrong dependency if your package.toml file uses the `package` configuration
Rust is a programming language. Rated critical severity (CVSS 10.0), this vulnerability is remotely exploitable, no auth
The Rust Programming Language Standard Library version 1.29.0, 1.28.0, 1.27.2, 1.27.1, 127.0, 126.2, 126.1, 126.0 contai
In the standard library in Rust before 1.52.0, the Zip implementation has a panic safety issue. Rated medium severity (C
The Rust Programming Language Standard Library 1.18.0 and later is affected by: CWE-200: Information Exposure. Rated med
Same weakness CWE-295 – Improper Certificate Validation
View allSame technique Information Disclosure
View allShare
External POC / Exploit Code
Leaving vuln.today