How severe is CVE-2026-107296?

CVE-2026-107296 has a CVSS 3.x base score of 3.7, rated low severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity low, and availability none.

Is CVE-2026-107296 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (19th percentile), an estimate of the probability of exploitation in the next 30 days.

How do I fix CVE-2026-107296?

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

When was CVE-2026-107296 published?

CVE-2026-107296 was published on 2026-10-08 and last updated on 2026-10-14.

CVE-2026-107296

CVE-2026-107296 is a low-severity vulnerability with a CVSS 3.x base score of 3.7. 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-471.

Key facts

Severity: Low (CVSS 3.x base score 3.7)
EPSS exploit prediction: 0% (19th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-471
Published: 2026-10-08
Last modified: 2026-10-14

Description

msgpack5 is a msgpack v5 implementation for node.js and the browser. Prior to 6.1.0, decoding a negative signed 64-bit integer modifies the corresponding bytes in the caller-provided input buffer while computing the value. Applications that retain or reuse encoded input for integrity checks, logging, or later processing can observe silently corrupted data, while positive integers and other MessagePack value types are unaffected. This issue is fixed in version 6.1.0.

Frequently asked questions

What is CVE-2026-107296?: msgpack5 is a msgpack v5 implementation for node.js and the browser. Prior to 6.1.0, decoding a negative signed 64-bit integer modifies the corresponding bytes in the caller-provided input buffer while computing the value. Applications that retain or reuse encoded input for integrity checks, logging, or later processing can observe silently corrupted data, while positive integers and other MessagePack value types are unaffected. This issue is fixed in version 6.1.0.
How severe is CVE-2026-107296?: CVE-2026-107296 has a CVSS 3.x base score of 3.7, rated low severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity low, and availability none.
Is CVE-2026-107296 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (19th percentile), an estimate of the probability of exploitation in the next 30 days.
How do I fix CVE-2026-107296?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2026-107296 published?: CVE-2026-107296 was published on 2026-10-08 and last updated on 2026-10-14.

References

Other CWE-471 vulnerabilities

CVE-2026-50481 — Critical (CVSS 9.9): Modification of assumed-immutable data (maid) in Azure Active Directory allows an authorized attacker to elevate…
CVE-2022-25893 — Critical (CVSS 9.8): The package vm2 before 3.9.10 are vulnerable to Arbitrary Code Execution due to the usage of prototype lookup for the…
CVE-2018-3722 — High (CVSS 8.8): merge-deep node module before 3.0.1 suffers from a Modification of Assumed-Immutable Data (MAID) vulnerability, which…
CVE-2018-3720 — High (CVSS 8.8): assign-deep node module before 0.4.7 suffers from a Modification of Assumed-Immutable Data (MAID) vulnerability, which…
CVE-2018-3728 — High (CVSS 8.8): hoek node module before 4.2.0 and 5.0.x before 5.0.3 suffers from a Modification of Assumed-Immutable Data (MAID)…
CVE-2024-55551 — High (CVSS 8.3): An issue was discovered in Exasol JDBC driver before 24.2.1 (2024-12-10). Attackers can inject malicious parameters…

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