CVE-2026-34043

MEDIUM

5.9

CVSS v3

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.

CWE-400Resource Exhaustion CWE-834

How to fix

Remediation Available

node-serialize-javascriptDebian

Fixed in:7.0.5+~5.0.4-1CVE-2026-34043

aspnetcore-runtime-8.0Rocky

Fixed in:0:8.0.27-1.el10_2RHSA-2026:21286

Fixed in:0:8.0.27-1.el10_0RHSA-2026:24332

Fixed in:0:8.0.27-1.el10_2RHSA-2026:21286

Fixed in:0:8.0.27-1.el10_0RHSA-2026:24332

Fixed in:0:8.0.27-1.el10_2RHSA-2026:21286

aspnetcore-runtime-8.0Red Hat / RHEL

Fixed in:0:8.0.27-1.el10_0RHSA-2026:24332

Fixed in:0:8.0.27-1.el10_2RHSA-2026:21286

Fixed in:0:8.0.27-1.el10_0RHSA-2026:24332

Fixed in:0:8.0.27-1.el10_2RHSA-2026:21286

Fixed in:0:8.0.27-1.el10_0RHSA-2026:24332

aspnetcore-runtime-dbg-8.0Rocky

Fixed in:0:8.0.27-1.el10_0RHSA-2026:24332

Fixed in:0:8.0.27-1.el10_2RHSA-2026:21286

Fixed in:0:8.0.27-1.el10_0RHSA-2026:24332

Fixed in:0:8.0.27-1.el10_2RHSA-2026:21286

Fixed in:0:8.0.27-1.el10_0RHSA-2026:24332

aspnetcore-runtime-dbg-8.0Red Hat / RHEL

Fixed in:0:8.0.27-1.el10_0RHSA-2026:24332

Fixed in:0:8.0.27-1.el10_2RHSA-2026:21286

Fixed in:0:8.0.27-1.el10_0RHSA-2026:24332

Fixed in:0:8.0.27-1.el10_2RHSA-2026:21286

Fixed in:0:8.0.27-1.el10_0RHSA-2026:24332

aspnetcore-targeting-pack-8.0Rocky

Fixed in:0:8.0.27-1.el10_0RHSA-2026:24332

Fixed in:0:8.0.27-1.el10_2RHSA-2026:21286

Fixed in:0:8.0.27-1.el10_0RHSA-2026:24332

Fixed in:0:8.0.27-1.el10_2RHSA-2026:21286

Fixed in:0:8.0.27-1.el10_0RHSA-2026:24332

Fixed in:0:8.0.27-1.el10_2RHSA-2026:21286

Fixed in:0:8.0.27-1.el10_0RHSA-2026:24332

aspnetcore-targeting-pack-8.0Red Hat / RHEL

Fixed in:0:8.0.27-1.el10_0RHSA-2026:24332

Fixed in:0:8.0.27-1.el10_2RHSA-2026:21286

Fixed in:0:8.0.27-1.el10_0RHSA-2026:24332

Fixed in:0:8.0.27-1.el10_2RHSA-2026:21286

Fixed in:0:8.0.27-1.el10_0RHSA-2026:24332

Fixed in:0:8.0.27-1.el10_2RHSA-2026:21286

dotnet-apphost-pack-8.0Red Hat / RHEL

Fixed in:0:8.0.27-1.el10_0RHSA-2026:24332

Fixed in:0:8.0.27-1.el10_2RHSA-2026:21286

Fixed in:0:8.0.27-1.el10_0RHSA-2026:24332

Fixed in:0:8.0.27-1.el10_2RHSA-2026:21286

Fixed in:0:8.0.27-1.el10_0RHSA-2026:24332

Fixed in:0:8.0.27-1.el10_2RHSA-2026:21286

dotnet-apphost-pack-8.0Rocky

Fixed in:0:8.0.27-1.el10_0RHSA-2026:24332

Fixed in:0:8.0.27-1.el10_2RHSA-2026:21286

Fixed in:0:8.0.27-1.el10_0RHSA-2026:24332

Fixed in:0:8.0.27-1.el10_2RHSA-2026:21286

Fixed in:0:8.0.27-1.el10_0RHSA-2026:24332

dotnet-apphost-pack-8.0-debuginfoRocky

Fixed in:0:8.0.27-1.el10_2RHSA-2026:21286

Fixed in:0:8.0.27-1.el10_0RHSA-2026:24332

Fixed in:0:8.0.27-1.el10_2RHSA-2026:21286

Fixed in:0:8.0.27-1.el10_0RHSA-2026:24332

Fixed in:0:8.0.27-1.el10_2RHSA-2026:21286

Fixed in:0:8.0.27-1.el10_0RHSA-2026:24332

dotnet-apphost-pack-8.0-debuginfoRed Hat / RHEL

Fixed in:0:8.0.27-1.el10_2RHSA-2026:21286

Fixed in:0:8.0.27-1.el10_0RHSA-2026:24332

Fixed in:0:8.0.27-1.el10_2RHSA-2026:21286

Fixed in:0:8.0.27-1.el10_0RHSA-2026:24332

dotnet-hostRed Hat / RHEL

Fixed in:0:8.0.27-1.el9_4RHSA-2026:24334

dotnet-hostRocky

Fixed in:0:8.0.27-1.el9_4RHSA-2026:24334

dotnet-host-debuginfoRed Hat / RHEL

Fixed in:0:8.0.27-1.el9_4RHSA-2026:24334

dotnet-host-debuginfoRocky

Fixed in:0:8.0.27-1.el9_4RHSA-2026:24334

dotnet-hostfxr-8.0Rocky

Fixed in:0:8.0.27-1.el10_2RHSA-2026:21286

Fixed in:0:8.0.27-1.el10_0RHSA-2026:24332

Fixed in:0:8.0.27-1.el10_2RHSA-2026:21286

Fixed in:0:8.0.27-1.el10_0RHSA-2026:24332

Fixed in:0:8.0.27-1.el10_2RHSA-2026:21286

dotnet-hostfxr-8.0Red Hat / RHEL

Fixed in:0:8.0.27-1.el10_2RHSA-2026:21286

Fixed in:0:8.0.27-1.el10_0RHSA-2026:24332

dotnet-hostfxr-8.0-debuginfoRocky

Fixed in:0:8.0.27-1.el10_0RHSA-2026:24332

Fixed in:0:8.0.27-1.el10_2RHSA-2026:21286

Fixed in:0:8.0.27-1.el10_0RHSA-2026:24332

Fixed in:0:8.0.27-1.el10_2RHSA-2026:21286

Fixed in:0:8.0.27-1.el10_0RHSA-2026:24332

Fixed in:0:8.0.27-1.el10_2RHSA-2026:21286

Fixed in:0:8.0.27-1.el10_0RHSA-2026:24332

dotnet-hostfxr-8.0-debuginfoRed Hat / RHEL

Fixed in:0:8.0.27-1.el10_0RHSA-2026:24332

Fixed in:0:8.0.27-1.el10_2RHSA-2026:21286

Fixed in:0:8.0.27-1.el10_0RHSA-2026:24332

Fixed in:0:8.0.27-1.el10_2RHSA-2026:21286

Fixed in:0:8.0.27-1.el10_0RHSA-2026:24332

Fixed in:0:8.0.27-1.el10_2RHSA-2026:21286

dotnet-runtime-8.0Red Hat / RHEL

Fixed in:0:8.0.27-1.el10_2RHSA-2026:21286

Fixed in:0:8.0.27-1.el10_0RHSA-2026:24332

Fixed in:0:8.0.27-1.el10_2RHSA-2026:21286

Fixed in:0:8.0.27-1.el10_0RHSA-2026:24332

dotnet-runtime-8.0Rocky

Fixed in:0:8.0.27-1.el10_0RHSA-2026:24332

Fixed in:0:8.0.27-1.el10_2RHSA-2026:21286

Fixed in:0:8.0.27-1.el10_0RHSA-2026:24332

Fixed in:0:8.0.27-1.el10_2RHSA-2026:21286

Fixed in:0:8.0.27-1.el10_0RHSA-2026:24332

dotnet-runtime-8.0-debuginfoRocky

Fixed in:0:8.0.27-1.el10_0RHSA-2026:24332

Fixed in:0:8.0.27-1.el10_2RHSA-2026:21286

Fixed in:0:8.0.27-1.el10_0RHSA-2026:24332

dotnet-runtime-8.0-debuginfoRed Hat / RHEL

Fixed in:0:8.0.27-1.el10_2RHSA-2026:21286

Fixed in:0:8.0.27-1.el10_0RHSA-2026:24332

Fixed in:0:8.0.27-1.el10_2RHSA-2026:21286

Fixed in:0:8.0.27-1.el10_0RHSA-2026:24332

Fixed in:0:8.0.27-1.el10_2RHSA-2026:21286

Fixed in:0:8.0.27-1.el10_0RHSA-2026:24332

Fixed in:0:8.0.27-1.el10_2RHSA-2026:21286

dotnet-runtime-dbg-8.0Red Hat / RHEL

Fixed in:0:8.0.27-1.el10_0RHSA-2026:24332

Fixed in:0:8.0.27-1.el10_2RHSA-2026:21286

Fixed in:0:8.0.27-1.el10_0RHSA-2026:24332

Fixed in:0:8.0.27-1.el10_2RHSA-2026:21286

Fixed in:0:8.0.27-1.el10_0RHSA-2026:24332

Fixed in:0:8.0.27-1.el10_2RHSA-2026:21286

dotnet-runtime-dbg-8.0Rocky

Fixed in:0:8.0.27-1.el10_2RHSA-2026:21286

Fixed in:0:8.0.27-1.el10_0RHSA-2026:24332

Fixed in:0:8.0.27-1.el10_2RHSA-2026:21286

Fixed in:0:8.0.27-1.el10_0RHSA-2026:24332

Fixed in:0:8.0.27-1.el10_2RHSA-2026:21286

dotnet-sdk-8.0Rocky

Fixed in:0:8.0.127-1.el10_2RHSA-2026:21286

Fixed in:0:8.0.127-1.el10_0RHSA-2026:24332

Fixed in:0:8.0.127-1.el10_2RHSA-2026:21286

Fixed in:0:8.0.127-1.el10_0RHSA-2026:24332

Fixed in:0:8.0.127-1.el10_2RHSA-2026:21286

dotnet-sdk-8.0Red Hat / RHEL

Fixed in:0:8.0.127-1.el10_0RHSA-2026:24332

Fixed in:0:8.0.127-1.el10_2RHSA-2026:21286

Fixed in:0:8.0.127-1.el10_0RHSA-2026:24332

Fixed in:0:8.0.127-1.el10_2RHSA-2026:21286

Fixed in:0:8.0.127-1.el10_0RHSA-2026:24332

dotnet-sdk-8.0-debuginfoRed Hat / RHEL

Fixed in:0:8.0.127-1.el10_0RHSA-2026:24332

Fixed in:0:8.0.127-1.el10_2RHSA-2026:21286

Fixed in:0:8.0.127-1.el10_0RHSA-2026:24332

dotnet-sdk-8.0-debuginfoRocky

Fixed in:0:8.0.127-1.el10_2RHSA-2026:21286

Fixed in:0:8.0.127-1.el10_0RHSA-2026:24332

Fixed in:0:8.0.127-1.el10_2RHSA-2026:21286

Fixed in:0:8.0.127-1.el10_0RHSA-2026:24332

dotnet-sdk-8.0-source-built-artifactsRed Hat / RHEL

Fixed in:0:8.0.127-1.el10_2RHSA-2026:21286

Fixed in:0:8.0.127-1.el10_0RHSA-2026:24332

Fixed in:0:8.0.127-1.el10_2RHSA-2026:21286

Fixed in:0:8.0.127-1.el10_0RHSA-2026:24332

This vulnerability affects an unusually large number of packages. The highest-confidence fixes are shown above; the full list is longer. Check the referenced advisories for complete coverage.

TridentStack Control can deploy fixes like this automatically across your Windows, macOS, and Linux fleet. See how it works

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityHigh

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityNone

IntegrityNone

AvailabilityHigh

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U

Exploit Intelligence

0.47%probability of exploitation in 30 days

39thpercentile

Low risk: more likely to be exploited than 39% of all known CVEs.

References

Patch1

github.com

Vendor Advisory1

github.com

Release Notes1

github.com

Related Vulnerabilities

Other CWE-400 (Resource Exhaustion) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2023-44487	High	7.5	100%	KEV	Fix
CVE-2021-44228	Critical	10.0	100%	KEV + Ransom	Fix
CVE-2011-3192	High	7.8	99%	-	Fix
CVE-2019-11478	Medium	5.3	95%	-	Fix
CVE-2023-21547	High	7.5	89%	-	Fix
CVE-2024-25617	Medium	5.3	89%	-	Fix

Common questions

How do I fix CVE-2026-34043?

Published advisories record a fix for 171 affected products. The "How to fix" section on this page lists the fixed version and source advisory for each one, so apply the entry matching what you actually run.

Is CVE-2026-34043 being actively exploited?

Not that we know of. CVE-2026-34043 is not in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score of 0.47% is the estimated probability that it will be exploited in the next 30 days. That is higher than 39% of all scored CVEs.

How severe is CVE-2026-34043?

CVE-2026-34043 has a CVSS v3 base score of 5.9, rated moderate. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.

What does CVE-2026-34043 affect?

Published advisories record a fix for node-serialize-javascript (Debian), aspnetcore-runtime-8.0 (Rocky), aspnetcore-runtime-8.0 (Red Hat / RHEL), aspnetcore-runtime-dbg-8.0 (Rocky), and 167 more. The list on this page is capped, so there may be more.

Embed a live status badge for CVE-2026-34043

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-04-03.