CVE-2026-23957 json
seroval is vulnerable to Denial of Service via array serialization
published 9mo ago modified 4mo 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
Summary
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
Is CVE-2026-23957 in your dependencies? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.
Check with FencerVendor 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 cvss 7.5
seroval: Seroval: Denial of Service via large encoded array lengths
-
Red Hat All currently supported Red Hat productsnot 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
- 9mo ago
Exploit prediction
0.44% chance of exploitation in the next 30 days, higher than 38% of all scored CVEs (FIRST EPSS, 2026-11-09).
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
- CVE List CVE-2026-23957
- GitHub Advisory GHSA-66fc-rw6m-c2q6
- NVD CVE-2026-23957
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