CVE-2026-34043
No exploitation reported by the sources we read.
- Published2026-03-31
- Fixed in7.0.5
- WeaknessCWE-400 · CWE-834
Am I affected?
Debian, Ubuntu or Red Hat sometimes backport a fix without changing the upstream version number: such a version reads « to verify », never « affected ».With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.
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.
Timeline
dates in UTC- 2026-03-3103:15CVE publishedNVD
Observed activity
isMalicious corpus · updated 2026-10-23 21:37 UTCBlock these indicators
- Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2026-34043?format=txt
- CSV export: https://api.ismalicious.com/edl/cve/CVE-2026-34043?format=csv
- TAXII collection of exploited CVEs
- The EDL and CSV take an API key on the Pro plan.
Versions per branch
NVD · OSV| Branch | Affected | Fixed in | Source |
|---|---|---|---|
| 7.0 | < 7.0.5 | 7.0.5 | NVD |
| 7.0 | ≥ 5.0.0, < 7.0.5 | 7.0.5 | OSV |
as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.
Distribution builds and vendor advisories
Packages from OSV.dev and products from the vendors' CSAF advisories.
version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.
Packages
- dotnet-hostfxr-8.0AlmaLinux:10all versions · fixed in 8.0.27-1.el10_2and 7 other packages
- dotnet-hostfxr-8.0AlmaLinux:9all versions · fixed in 8.0.27-1.el9_8and 7 other packages
- dotnet-hostfxr-8.0AlmaLinux:8all versions · fixed in 8.0.27-1.el8_10and 7 other packages
- dotnet-sdk-8.0AlmaLinux:10all versions · fixed in 8.0.127-1.el10_2and 3 other packages
- dotnet-sdk-8.0AlmaLinux:9all versions · fixed in 8.0.127-1.el9_8and 3 other packages
- dotnet-sdk-8.0AlmaLinux:8all versions · fixed in 8.0.127-1.el8_10and 3 other packages
Vendor advisories
Red Hat Security Advisory: Red Hat OpenShift Data Foundation 4.18.27 security, enhancement & bug fix update
Red Hat Security Advisory: OpenShift Container Platform 4.19.32 bug fix and security update
Red Hat Security Advisory: OpenShift Container Platform 4.20.23 bug fix and security update
Fix
- Update Yahoo serialize to 7.0.5
- Vendor fix Red Hat Product Security RHSA-2026:56431 · 68 productsBefore applying this update, make sure all previously released errata relevant to your system have been applied. For details on how to apply this update, refer to: https://docs.redhat.com/en/documentation/red_hat_openshift_data_foundation/4.18/html/updating_openshift_data_foundation/updating-ocs-…
- Vendor fix Red Hat Product Security RHSA-2026:20041 · 4 productsFor OpenShift Container Platform 4.19 see the following documentation, which will be updated shortly for this release, for important instructions on how to upgrade your cluster and fully apply this asynchronous errata update: https://docs.redhat.com/en/documentation/openshift_container_platform/4.…
- Vendor fix Red Hat Product Security RHSA-2026:17468 · 4 productsFor OpenShift Container Platform 4.20 see the following documentation, which will be updated shortly for this release, for important instructions on how to upgrade your cluster and fully apply this asynchronous errata update: https://docs.redhat.com/en/documentation/openshift_container_platform/4.…
- Workaround from the vendor Red Hat Product Security RHSA-2026:56431 · 81 productsMitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.
Advisories and patches
- github.comPatch
- github.comRelease Notes
- github.comVendor Advisory
Detection
- Nuclei template
- none so far ProjectDiscovery
- Exploit-DB
- no entry Exploit-DB
- Proof-of-concept repositories
- none listed PoC-in-GitHub
Sources
Technical details
- CVSS v3 Vector
- CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- Published
- 2026-03-31
- Last Modified
- 2026-06-17
- NVD status
- Analyzed
Frequently asked questions
What is CVE-2026-34043?
Is CVE-2026-34043 actively exploited?
What is the CVSS score for CVE-2026-34043?
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Related vulnerabilities
Same product first, then the same vendor advisory and the same publication week.