CVSS Meta Temp Score CVSS is a standardized scoring system to determine possibilities of attacks. The Temp Score considers temporal factors like disclosure, exploit and countermeasures. The unique Meta Score calculates the average score of different sources to provide a normalized scoring system.	Current Exploit Price (≈) Our analysts are monitoring exploit markets and are in contact with vulnerability brokers. The range indicates the observed or calculated exploit price to be seen on exploit markets. A good indicator to understand the monetary effort required for and the popularity of an attack.	CTI Interest Score Our Cyber Threat Intelligence team is monitoring different web sites, mailing lists, exploit markets and social media networks. The CTI Interest Score identifies the interest of attackers and the security community for this specific vulnerability in real-time. A high score indicates an elevated risk to be targeted for this vulnerability.
5.4	$0-$5k	0.47

Summaryinfo

A vulnerability identified as problematic has been detected in varnish-software Varnish Cache up to 8.0.0. This vulnerability affects unknown code. Performing a manipulation results in incorrect behavior order: validate before canonicalize. This vulnerability is reported as CVE-2026-34475. The attack is possible to be carried out remotely. No exploit exists. You should upgrade the affected component.

Detailsinfo

A vulnerability, which was classified as problematic, was found in varnish-software Varnish Cache up to 8.0.0. This affects some unknown functionality. The manipulation with an unknown input leads to a incorrect behavior order: validate before canonicalize vulnerability. CWE is classifying the issue as CWE-180. The product validates input before it is canonicalized, which prevents the product from detecting data that becomes invalid after the canonicalization step. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

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.

It is possible to read the advisory at vinyl-cache.org. This vulnerability is uniquely identified as CVE-2026-34475 since 03/27/2026. The exploitability is told to be difficult. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. The technical details are unknown and an exploit is not publicly available.

The vulnerability scanner Nessus provides a plugin with the ID 304158 (Linux Distros Unpatched Vulnerability : CVE-2026-34475), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 6.0.17 LTS or 8.0.1 eliminates this vulnerability.

The vulnerability is also documented in the databases at Tenable (304158) and EUVD (EUVD-2026-16801). Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Productinfo

Vendor

• varnish-software

Name

• Varnish Cache

Version

• 8.0

CPE 2.3info

• 🔒

CPE 2.2info

• 🔒

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.5
VulDB Meta Temp Score: 5.4

VulDB Base Score: 5.6
VulDB Temp Score: 5.4
VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA Base Score: 5.4
CNA Vector (MITRE): 🔒

CVSSv2info

AV	AC	Au	C	I	A
💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳

Vector	Complexity	Authentication	Confidentiality	Integrity	Availability
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock

VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Incorrect behavior order: validate before canonicalize
CWE: CWE-180 / CWE-179 / CWE-20
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

0-Day	Unlock	Unlock	Unlock	Unlock
Today	Unlock	Unlock	Unlock	Unlock

Nessus ID: 304158
Nessus Name: Linux Distros Unpatched Vulnerability : CVE-2026-34475

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Varnish Cache 6.0.17 LTS/8.0.1

Timelineinfo

03/27/2026 Advisory disclosed
03/27/2026 +0 days CVE reserved
03/27/2026 +0 days VulDB entry created
03/28/2026 +1 days VulDB entry last update

Sourcesinfo

Advisory: vinyl-cache.org
Status: Confirmed

CVE: CVE-2026-34475 (🔒)
GCVE (CVE): GCVE-0-2026-34475
GCVE (VulDB): GCVE-100-354027
EUVD: 🔒

Entryinfo

Created: 03/27/2026 23:43
Updated: 03/28/2026 23:31
Changes: 03/27/2026 23:43 (62), 03/28/2026 04:36 (1), 03/28/2026 23:31 (2)
Complete: 🔍
Cache ID: 216:4B0:103

Discussion

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