HOMEVULNERABILITIESCVE-2026-34043
HIGH

CVE-2026-34043

CWE-400Published: March 31, 2026· Updated: Apr 3, 2026

7.5
CVSS v3.1
EPSS:0.04%probability of exploitation in 30 daysPercentile:11.2th

Official Description

Serialize JavaScript to a superset of JSON that includes regular expressions and functions. Prior to version 7.0.5, there is a Denial of Service (DoS) vulnerability caused by CPU exhaustion. When serializing a specially crafted "array-like" object (an object that inherits from Array.prototype but has a very large length property), the process enters an intensive loop that consumes 100% CPU and hangs indefinitely. This issue has been patched in version 7.0.5.

NVD Source

Technical Analysis

CVE-2026-34043 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in availability disruption (denial of service), with a CVSS base score of 7.5.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorNetwork
Attack ComplexityLow
Privileges Req.None
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityNone
IntegrityNone
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected Vendors & Products

yahoo1 product
serialize
Source: NVD CPE · 1 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
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Official Patches & Advisories

PATCHhttps://github.com/yahoo/serialize-javascript/commit/f147e90269b58bb6e539cfdf3d0e20d6ad14204b
ADVISORYhttps://github.com/yahoo/serialize-javascript/security/advisories/GHSA-qj8w-gfj5-8c6v

All References (3)

→
https://github.com/yahoo/serialize-javascript/commit/f147e90269b58bb6e539cfdf3d0e20d6ad14204bPatch
→
https://github.com/yahoo/serialize-javascript/releases/tag/v7.0.5Release Notes
→
https://github.com/yahoo/serialize-javascript/security/advisories/GHSA-qj8w-gfj5-8c6vVendor Advisory

Quick Facts

CVE IDCVE-2026-34043
CVSS Score7.5 / 10
SeverityHIGH
WeaknessCWE-400
CISA KEVNo
EPSS (30d)0.04%
Affected1 vendor
PublishedMar 31, 2026

Related CVEs (CWE-400)

CVE-2026-30141
9.8
CVE-2026-8856
9.1
CVE-2026-7790
8.7
CVE-2026-3505
8.7
CVE-2026-45169
8.7
CVE-2025-32424
8.7

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2026-34043 in threat intel feeds
  • →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWATCH.COM. CVE data is provided under the NVD usage policy.
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