How severe is CVE-2026-34043?

CVE-2026-34043 has a CVSS 3.x base score of 5.9, rated medium severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2026-34043 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (38th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-34043?

CVE-2026-34043 affects Yahoo Serialize. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-34043?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2026-34043 have an EU (EUVD) identifier?

Yes. CVE-2026-34043 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-17288.

When was CVE-2026-34043 published?

CVE-2026-34043 was published on 2026-03-31 and last updated on 2026-06-17.

CVE-2026-34043

CVE-2026-34043 is a medium-severity vulnerability in Yahoo Serialize with a CVSS 3.x base score of 5.9. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-400.

Key facts

Severity: Medium (CVSS 3.x base score 5.9)
EPSS exploit prediction: 0% (38th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-17288
Weakness: CWE-400
Affected product: Yahoo Serialize
Published: 2026-03-31
Last modified: 2026-06-17

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.

Frequently asked questions

What is CVE-2026-34043?: 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.
How severe is CVE-2026-34043?: CVE-2026-34043 has a CVSS 3.x base score of 5.9, rated medium severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2026-34043 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (38th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-34043?: CVE-2026-34043 affects Yahoo Serialize. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-34043?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-34043 have an EU (EUVD) identifier?: Yes. CVE-2026-34043 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-17288.
When was CVE-2026-34043 published?: CVE-2026-34043 was published on 2026-03-31 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:yahoo:serialize:*:*:*:*:*:*:*:*

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