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CVE

CVE-2026-23737

seroval Affected by Remote Code Execution via JSON Deserialization
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CVE

CVE-2026-23737

seroval Affected by Remote Code Execution via JSON Deserialization

Improper input handling in the JSON deserialization component can lead to arbitrary JavaScript code execution.

The vulnerability can be exploited via overriding constant value and error deserialization, which allows indirect access to unsafe JS evaluation. This requires at least the ability to perform 4 separate requests on the same function and partial knowledge of how the serialized data is used during later runtime processing. 

This vulnerability affects the fromJSON and fromCrossJSON functions in a client-to-server transmission scenario.

No known workarounds or mitigations are known, so please upgrade to the patched version.

Package Versions Affected

Package Version
patch Availability
No items found.

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CVSS Version

Severity
Base Score
CVSS Version
Score Vector
C
H
U
7.5
-
3.1
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
C
H
U
0
-
3.1
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
C
H
U
7.5
-
3.1
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

Related Resources

No items found.

References

https://github.com/lxsmnsyc/seroval/security/advisories/GHSA-3rxj-6cgf-8cfw, https://nvd.nist.gov/vuln/detail/CVE-2026-23737, https://github.com/lxsmnsyc/seroval/commit/ce9408ebc87312fcad345a73c172212f2a798060, https://github.com/lxsmnsyc/seroval

Severity

7.5

CVSS Score
0
10

Basic Information

Ecosystem
Base CVSS
7.5
EPSS Probability
0.00239%
EPSS Percentile
0.467%
Introduced Version
0,0.13.0,0.10.1,0.4.0-alpha.4
Fix Available
1.4.1

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