seroval Affected by Prototype Pollution via JSON Deserialization

published 2026-01-21 9 mo ago modified 2026-06-17 4 mo ago also GHSA-hj76-42vx-jwp4 , EUVD-2026-3680

cvss: 7.3; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 0.3%; EPSS 0.3% chance of exploitation in 30 days, percentile 23%
public exploits: 0; none known

seroval facilitates JS value stringification, including complex structures beyond JSON.stringify capabilities. In versions 1.4.0 and below, due to improper input validation, a malicious object key can lead to prototype pollution during JSON deserialization. This vulnerability affects only JSON deserialization functionality. This issue is fixed in version 1.4.1.

Patch / fix

fixed in 2 distros 1 links 1

npm seroval 1.4.1
lxsmnsyc seroval 1.4.1

opencode openSUSE Tumbleweed 1.18.26-1.1

opensuse advisories openSUSE-SU-2026:11673-1

github.com/lxsmnsyc/seroval@ce9408e commit

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-23736 updated 2026-06-28 cvss 7.3

seroval: seroval: Prototype pollution via improper input validation during JSON deserialization

Red Hat All currently supported Red Hat products
not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation: none
Automatable: yes
Technical impact: partial
Assessed: 9 mo ago (2026-01-22)

Exploit prediction

0.30% chance of exploitation in the next 30 days, higher than 23% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
CNA	3.1	7.3	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
NVD	3.1	9.8	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
GitHub	3.1	7.3	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L

Affected packages

ecosystem	package	affected	fixed in
npm	seroval	<1.4.1	1.4.1

Affected products

lxsmnsyc seroval

Classification

Weakness

CWE-1321 Improperly Controlled Modification of Object Prototype Attributes

References

github.com /lxsmnsyc/seroval/commit/ce9408ebc87312fcad345a73c172212f2a798060
web, patch
github.com /lxsmnsyc/seroval/security/advisories/GHSA-hj76-42vx-jwp4
web, vendor-advisory
nvd.nist.gov /vuln/detail/CVE-2026-23736
advisory
github.com /lxsmnsyc/seroval
package

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary