CVE-2026-34475
Summary
| CVE | CVE-2026-34475 |
|---|---|
| State | PUBLISHED |
| Assigner | mitre |
| Source Priority | CVE Program / NVD first with legacy fallback |
| Published | 2026-03-27 20:16:36 UTC |
| Updated | 2026-04-22 19:40:02 UTC |
| Description | Varnish Cache before 8.0.1 and Varnish Enterprise before 6.0.16r12, in certain unchecked req.url scenarios, mishandle URLs with a path of / for HTTP/1.1, potentially leading to cache poisoning or authentication bypass. |
Risk And Classification
Primary CVSS: v3.1 9.8 CRITICAL from [email protected]
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS: 0.000440000 probability, percentile 0.134660000 (date 2026-04-06)
Problem Types: CWE-180 | CWE-180 CWE-180 Incorrect Behavior Order: Validate Before Canonicalize
| Version | Source | Type | Score | Severity | Vector |
|---|---|---|---|---|---|
| 3.1 | [email protected] | Primary | 9.8 | CRITICAL | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
| 3.1 | [email protected] | Secondary | 5.4 | MEDIUM | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:L/A:N |
| 3.1 | CNA | CVSS | 5.4 | MEDIUM | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:L/A:N |
CVSS v3.1 Breakdown
Attack Vector
NetworkAttack Complexity
LowPrivileges Required
NoneUser Interaction
NoneScope
UnchangedConfidentiality
HighIntegrity
HighAvailability
HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
NVD Known Affected Configurations (CPE 2.3)
| Type | Vendor | Product | Version | Update | Edition | Language |
|---|---|---|---|---|---|---|
| Application | Varnish-software | Varnish Enterprise | 6.0.16 | r1 | All | All |
| Application | Varnish-software | Varnish Enterprise | 6.0.16 | r10 | All | All |
| Application | Varnish-software | Varnish Enterprise | 6.0.16 | r11 | All | All |
| Application | Varnish-software | Varnish Enterprise | 6.0.16 | r2 | All | All |
| Application | Varnish-software | Varnish Enterprise | 6.0.16 | r3 | All | All |
| Application | Varnish-software | Varnish Enterprise | 6.0.16 | r4 | All | All |
| Application | Varnish-software | Varnish Enterprise | 6.0.16 | r5 | All | All |
| Application | Varnish-software | Varnish Enterprise | 6.0.16 | r6 | All | All |
| Application | Varnish-software | Varnish Enterprise | 6.0.16 | r7 | All | All |
| Application | Varnish-software | Varnish Enterprise | 6.0.16 | r8 | All | All |
| Application | Varnish-software | Varnish Enterprise | 6.0.16 | r9 | All | All |
| Application | Varnish-software | Varnish Enterprise | All | All | All | All |
| Application | Vinyl-cache | Vinyl Cache | All | All | All | All |
Vendor Declared Affected Products
| Source | Vendor | Product | Version | Platforms |
|---|---|---|---|---|
| CNA | Varnish-software | Varnish Cache | affected 6.0.17 LTS custom | Not specified |
| CNA | Varnish-software | Varnish Cache | affected 7.0.0 8.0.1 custom | Not specified |
References
| Reference | Source | Link | Tags |
|---|---|---|---|
| vinyl-cache.org/security/VSV00018.html | [email protected] | vinyl-cache.org | Vendor Advisory, Mitigation |
| CVE Program record | CVE.ORG | www.cve.org | canonical |
| NVD vulnerability detail | NVD | nvd.nist.gov | canonical, analysis |
No vendor comments have been submitted for this CVE.
There are currently no legacy QID mappings associated with this CVE.