How severe is CVE-2025-59340?

CVE-2025-59340 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2025-59340 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (81st percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2025-59340?

CVE-2025-59340 affects Hubspot Jinjava. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2025-59340?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

Does CVE-2025-59340 have an EU (EUVD) identifier?

Yes. CVE-2025-59340 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-29780.

When was CVE-2025-59340 published?

CVE-2025-59340 was published on 2025-09-17 and last updated on 2026-06-17.

CVE-2025-59340

CVE-2025-59340 is a critical-severity vulnerability in Hubspot Jinjava with a CVSS 3.x base score of 9.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-1336.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
EPSS exploit prediction: 2% (81st percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-29780
Weakness: CWE-1336
Affected product: Hubspot Jinjava
Published: 2025-09-17
Last modified: 2026-06-17

Description

jinjava is a Java-based template engine based on django template syntax, adapted to render jinja templates. Priori to 2.8.1, by using mapper.getTypeFactory().constructFromCanonical(), it is possible to instruct the underlying ObjectMapper to deserialize attacker-controlled input into arbitrary classes. This enables the creation of semi-arbitrary class instances without directly invoking restricted methods or class literals. As a result, an attacker can escape the sandbox and instantiate classes such as java.net.URL, opening up the ability to access local files and URLs(e.g., file:///etc/passwd). With further chaining, this primitive can potentially lead to remote code execution (RCE). This vulnerability is fixed in 2.8.1.

Frequently asked questions

What is CVE-2025-59340?: jinjava is a Java-based template engine based on django template syntax, adapted to render jinja templates. Priori to 2.8.1, by using mapper.getTypeFactory().constructFromCanonical(), it is possible to instruct the underlying ObjectMapper to deserialize attacker-controlled input into arbitrary classes. This enables the creation of semi-arbitrary class instances without directly invoking restricted methods or class literals. As a result, an attacker can escape the sandbox and instantiate classes such as java.net.URL, opening up the ability to access local files and URLs(e.g., file:///etc/passwd). With further chaining, this primitive can potentially lead to remote code execution (RCE). This vulnerability is fixed in 2.8.1.
How severe is CVE-2025-59340?: CVE-2025-59340 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2025-59340 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (81st percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2025-59340?: CVE-2025-59340 affects Hubspot Jinjava. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2025-59340?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
Does CVE-2025-59340 have an EU (EUVD) identifier?: Yes. CVE-2025-59340 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-29780.
When was CVE-2025-59340 published?: CVE-2025-59340 was published on 2025-09-17 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:hubspot:jinjava:*:*:*:*:*:*:*:*

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