seroval is vulnerable to Denial of Service via array serialization

published 2026-01-21 9 mo ago modified 2026-06-17 4 mo ago also GHSA-66fc-rw6m-c2q6 , EUVD-2026-3668

cvss: 7.5; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 0.4%; EPSS 0.4% chance of exploitation in 30 days, percentile 38%
public exploits: 0; none known

seroval facilitates JS value stringification, including complex structures beyond JSON.stringify capabilities. In versions 1.4.0 and below, overriding encoded array lengths by replacing them with an excessively large value causes the deserialization process to significantly increase processing time. This issue has been fixed in version 1.4.1.

Patch / fix

fixed in 2 links 1

npm seroval 1.4.1
lxsmnsyc seroval 1.4.1

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-2026-23957 updated 2026-06-28 cvss 7.5

seroval: Seroval: Denial of Service via large encoded array lengths

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

0.44% chance of exploitation in the next 30 days, higher than 38% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
CNA	3.1	7.5	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
GitHub	3.1	7.5	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected packages

ecosystem	package	affected	fixed in
npm	seroval	<1.4.1	1.4.1

Affected products

lxsmnsyc seroval

Classification

Weakness

CWE-770 Allocation of Resources Without Limits or Throttling

References

github.com /lxsmnsyc/seroval/commit/ce9408ebc87312fcad345a73c172212f2a798060
web, patch
github.com /lxsmnsyc/seroval/security/advisories/GHSA-66fc-rw6m-c2q6
web, mitigation, vendor-advisory
nvd.nist.gov /vuln/detail/CVE-2026-23957
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