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5.9
CVE-2026-34043EXPLOITED
IBM · App Connect Enterprise

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 seri

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.

Affected Products

VendorProductVersions
IBMApp Connect Enterprise—

Also Affects

Downstream vendors/products affected by this vulnerability

VendorProductSourceConfidence
ibmapp connect enterprisecert_advisory90%

References

  • https://github.com/yahoo/serialize-javascript/commit/f147e90269b58bb6e539cfdf3d0e20d6ad14204b
  • https://github.com/yahoo/serialize-javascript/releases/tag/v7.0.5
  • https://github.com/yahoo/serialize-javascript/security/advisories/GHSA-qj8w-gfj5-8c6v

Related News (2 articles)

Tier B
BSI Advisories4h ago
[NEU] [mittel] IBM App Connect Enterprise: Schwachstelle ermöglicht Denial of Service
→ No new info (linked only)
Tier A
Microsoft MSRC12d ago
CVE-2026-34043 Serialize JavaScript has CPU Exhaustion Denial of Service via crafted array-like objects
→ No new info (linked only)
CVSS 3.15.9 MEDIUM
VectorCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
CISA KEV❌ No
Actively exploited✅ Yes
CWECWE-400, CWE-834
PublishedMar 31, 2026
Last enriched4h agov2
Tags
data manipulationdenial of servicemultiple vulnerabilities
Trending Score53
Source articles2
Independent2
Info Completeness7/14
Missing: versions, epss, kev, exploit, patch, iocs, mitre_attack

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Verification

State: verified
Confidence: 100%

Vulnerability Timeline

CVE Published
Mar 31, 2026
Actively Exploited
Apr 1, 2026
Exploit Available
Apr 1, 2026
Discovered by ZDM
Apr 1, 2026
Updated: vendor, product
Apr 13, 2026

Version History

v2
Last enriched 4h ago
v2Tier B4h ago

Updated vendor to IBM, product to App Connect Enterprise, increased severity to HIGH, and marked exploit as available and actively exploited.

vendorproduct
via BSI Advisories
v111d ago

Initial creation