CVE-2026-118516VulnerabilityPublished 4 Nov 2026Updated 5 Nov 2026

The Symfony Routing components CompiledUrlMatcher and UrlMatcher interpret the host and path information differently

Affects symfonySource GCVE Database

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Authoritative record:CVE-2026-118516· Medium 6.3

Not known to be exploited · CVSS 6.3 Medium.

Data as of 6 Nov 2026, 05:05 UTC

CVSS 4.0 base score

6.3Medium

How severe the flaw is on the 0–10 CVSS scale.

Thin evidence

One scorer or none

CVSS scores by source
CNA (Checkmarx)	CVSS 4.0	6.3

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

Attack Vector: Network
Attack Complexity: Low
Attack Requirements: Present
Privileges Required: None
User Interaction: None
Vulnerable system confidentiality: Low
Vulnerable system integrity: Low
Vulnerable system availability: None
Subsequent system confidentiality: None
Subsequent system integrity: None
Subsequent system availability: None

Bold values are the worst case: easiest to exploit or largest impact.

Attack Vector: Network: The vulnerable system is bound to the network stack and the set of possible attackers extends beyond the other options listed below, up to and including the entire Internet. Such a vulnerability is often termed “remotely exploitable” and can be thought of as an attack being exploitable at the protocol level one or more network hops away (e.g., across one or more routers).
Attack Complexity: Low: The attacker must take no measurable action to exploit the vulnerability. The attack requires no target-specific circumvention to exploit the vulnerability. An attacker can expect repeatable success against the vulnerable system.
Attack Requirements: Present: The successful attack depends on the presence of specific deployment and execution conditions of the vulnerable system that enable the attack. These include: a race condition must be won to successfully exploit the vulnerability (the successfulness of the attack is conditioned on execution conditions that are not under full control of the attacker, or the attack may need to be launched multiple times against a single target before being successful); the attacker must inject themselves into the logical network path between the target and the resource requested by the victim (e.g. vulnerabilities requiring an on-path attacker).
Privileges Required: None: The attacker is unauthorized prior to attack, and therefore does not require any access to settings or files of the vulnerable system to carry out an attack.
User Interaction: None: The vulnerable system can be exploited without interaction from any human user, other than the attacker.
Vulnerable system confidentiality: Low: There is some loss of confidentiality. Access to some restricted information is obtained, but the attacker does not have control over what information is obtained, or the amount or kind of loss is limited. The information disclosure does not cause a direct, serious loss to the Vulnerable System.
Vulnerable system integrity: Low: Modification of data is possible, but the attacker does not have control over the consequence of a modification, or the amount of modification is limited. The data modification does not have a direct, serious impact to the Vulnerable System.
Vulnerable system availability: None: There is no impact to availability within the Vulnerable System.
Subsequent system confidentiality: None: There is no loss of confidentiality within the Subsequent System or all confidentiality impact is constrained to the Vulnerable System.
Subsequent system integrity: None: There is no loss of integrity within the Subsequent System or all integrity impact is constrained to the Vulnerable System.
Subsequent system availability: None: There is no impact to availability within the Subsequent System or all availability impact is constrained to the Vulnerable System.

Definitions: FIRST CVSS v4.0 specification.

Exploitation evidence

Disclosed: evidence found.
CVE published 4 Nov 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 5 Nov 2026.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponized: A Metasploit exploit module or Exploit-DB entry exists (Metasploit scanner modules do not count), or CISA SSVC or the CVSS exploit maturity reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

What to do

Affected software

Product	Affected	Fixed in
Ubuntu 26.10symfony`pkg:deb/ubuntu/symfony?arch=source&distro=stonking`Other threats	Affected 7.4.7+dfsg-1ubuntu1 – 7.4.16+dfsg-1ubuntu2 6 affected builds	Fixed in–
Ubuntu 26.04 LTSsymfony`pkg:deb/ubuntu/symfony?arch=source&distro=resolute`Other threats	Affected 6.4.24+dfsg-1 – 7.4.7+dfsg-1ubuntu1 4 affected builds	Fixed in–
Ubuntu Pro 24.04 LTSsymfony`pkg:deb/ubuntu/symfony?arch=source&distro=esm-apps/noble`Other threats	Affected 5.4.23+dfsg-1ubuntu1 – 6.4.5+dfsg-3ubuntu3+esm1 5 affected builds	Fixed in–
Ubuntu Pro 22.04 LTSsymfony`pkg:deb/ubuntu/symfony?arch=source&distro=esm-apps/jammy`Other threats	Affected =5.2.6+dfsg-1ubuntu7 =5.4.4+dfsg-1ubuntu8 =5.4.4+dfsg-1ubuntu8+esm1	Fixed in–
Ubuntu Pro 20.04 LTSsymfony`pkg:deb/ubuntu/symfony?arch=source&distro=esm-apps/focal`Other threats	Affected 4.3.4+dfsg-1ubuntu1 – 4.3.8+dfsg-1ubuntu1+esm2 4 affected builds	Fixed in–
Ubuntu Pro 18.04 LTSsymfony`pkg:deb/ubuntu/symfony?arch=source&distro=esm-apps/bionic`Other threats	Affected 2.8.7+dfsg-1.3ubuntu1 – 3.4.6+dfsg-1ubuntu0.1+esm2 6 affected builds	Fixed in–

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AI-suggested

As a mitigation, applications should avoid using host placeholders in routes protected solely by path-based access controls or ensure that host requirements do not accept characters like '/'. Using framework.trusted_hosts to restrict allowed Host headers can help but may not fully mitigate the issue if the host requirement is permissive and the web server passes raw Host headers. Review and update Symfony to fixed versions when available.

Description

A vulnerability in Symfony Routing components CompiledUrlMatcher and UrlMatcher allows path-based authorization rules to be bypassed in certain versions. The issue arises because these components interpret host and path information differently, enabling unauthorized requests to reach protected controllers when routes define a host with placeholders. This affects Symfony versions prior to 5.4.56, 6.x prior to 6.4.50, 7.x prior to 7.4.23, and 8.x prior to 8.1.11. The vulnerability can be exploited if the application uses host placeholders in routes protected by path-based access controls and if the host requirement accepts certain characters like '/'.

Impact

An attacker can bypass path-based authorization rules and access protected controllers without authentication if the application uses routes with host placeholders and path-based access controls. This can lead to unauthorized access to sensitive functionality or data. The impact is limited to affected Symfony versions and configurations where host placeholders are used and path-based rules are enforced. The CVSS 4.0 score is 6.3 (medium severity), reflecting network attack vector, low attack complexity, partial impact on confidentiality and integrity, and no impact on availability.

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Exploitation evidence

What to do

Affected software

Description

AI analysisMachine-generated, updated 6 Nov 2026, 05:05 UTC

Technical details

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