seroval Affected by Prototype Pollution via JSON Deserialization

Description

Due to improper input validation, a malicious object key can lead to prototype pollution during JSON deserialization.
This affects only JSON deserialization functionality.

As there is no known workaround, please upgrade to the latest version.

Basic information

Type
reviewed
Severity
high
Advisory on GitHub
Open advisory ↗
Repository advisory
Open repository advisory ↗
Source code
Browse source ↗
Published (advisory)
2026-01-21 15:41:14 UTC
Updated
2026-01-22 15:39:45 UTC
GitHub reviewed
2026-01-21 15:41:14 UTC
NVD published
2026-01-21

EPSS Score

Score Percentile
0.21% 43.02%

CVSS Scores

Base score Version Severity Vector
7.3 3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:L)
Some sensitive info could get out, but not a total data dump.
Integrity (I:L)
Attackers could change some data, but it’s limited—not everything goes.
Availability (A:L)
Might cause slowdowns, glitches, or partial disruption—not a full brick.

Identifiers

CWEs

CWE id Name
CWE-1321 Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution')

Credits

  • lxsmnsyc (coordinator)
  • tweidinger (other)

Affected packages (1)

Vulnerable version ranges and first patched releases as published by GitHub.

Ecosystem Package Vulnerable range First patched Vulnerable functions
npm seroval < 1.4.1 1.4.1

References

cvelogic Threat Intelligence