Symfony up to 2.35.x/3.0.x LiveComponent hydrateObjectValue input validation

Summaryinfo

A vulnerability, which was classified as critical, has been found in Symfony up to 2.35.x/3.0.x. Affected by this vulnerability is the function hydrateObjectValue of the component LiveComponent. Performing a manipulation of the argument Value results in input validation. This vulnerability was named CVE-2026-49208. The attack may be initiated remotely. There is no available exploit.

Detailsinfo

A vulnerability classified as critical has been found in Symfony up to 2.35.x/3.0.x. This affects the function hydrateObjectValue of the component LiveComponent. The manipulation of the argument value with an unknown input leads to a input validation vulnerability. CWE is classifying the issue as CWE-20. The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

Symfony UX is a JavaScript ecosystem for Symfony. From 2.8.0 until 2.36.0 and 3.1.0, when a #[LiveProp] is typed as DateTimeInterface and no explicit format is configured, Symfony\UX\LiveComponent\LiveComponentHydrator::hydrateObjectValue() falls back to new $className($value), allowing client-supplied relative strings such as now, tomorrow, or +10 years to move a writable, format-less date prop past time-based business logic checks. This issue is fixed in versions 2.36.0 and 3.1.0.

It is possible to read the advisory at github.com. This vulnerability is uniquely identified as CVE-2026-49208 since 05/28/2026. The exploitability is told to be easy. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. It demands that the victim is doing some kind of user interaction. Technical details of the vulnerability are known, but there is no available exploit.

Upgrading to version 2.36.0 or 3.1.0 eliminates this vulnerability.

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Productinfo

Name

• Symfony

Version

• 2.0
• 2.1
• 2.2
• 2.3
• 2.4
• 2.5
• 2.6
• 2.7
• 2.8
• 2.9
• 2.10
• 2.11
• 2.12
• 2.13
• 2.14
• 2.15
• 2.16
• 2.17
• 2.18
• 2.19
• 2.20
• 2.21
• 2.22
• 2.23
• 2.24
• 2.25
• 2.26
• 2.27
• 2.28
• 2.29
• 2.30
• 2.31
• 2.32
• 2.33
• 2.34
• 2.35
• 3.0

License

• open-source

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CPE 2.2info

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