How severe is CVE-2026-5476?

CVE-2026-5476 has a CVSS 3.x base score of 4.6, rated medium severity. It is exploitable over an adjacent network with high attack complexity, requires low privileges and no user interaction. Impact on confidentiality is low, integrity low, and availability low.

Is CVE-2026-5476 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (11th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-5476?

CVE-2026-5476 affects Nasa Core Flight System. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-5476?

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

Does CVE-2026-5476 have an EU (EUVD) identifier?

Yes. CVE-2026-5476 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-18814.

When was CVE-2026-5476 published?

CVE-2026-5476 was published on 2026-04-03 and last updated on 2026-06-17.

CVE-2026-5476

CVE-2026-5476 is a medium-severity vulnerability in Nasa Core Flight System with a CVSS 3.x base score of 4.6. 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-189.

Key facts

Severity: Medium (CVSS 3.x base score 4.6)
CVSS v2: 4.0
CVSS v4: 2.1
EPSS exploit prediction: 0% (11th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-18814
Weakness: CWE-189
Affected product: Nasa Core Flight System
Published: 2026-04-03
Last modified: 2026-06-17

Description

A vulnerability was identified in NASA cFS up to 7.0.0 on 32-bit. Affected is the function CFE_TBL_ValidateCodecLoadSize of the file cfe/modules/tbl/fsw/src/cfe_tbl_passthru_codec.c. The manipulation leads to integer overflow. The complexity of an attack is rather high. The exploitability is told to be difficult. A fix is planned for the upcoming version milestone of the project.

Frequently asked questions

What is CVE-2026-5476?: A vulnerability was identified in NASA cFS up to 7.0.0 on 32-bit. Affected is the function CFE_TBL_ValidateCodecLoadSize of the file cfe/modules/tbl/fsw/src/cfe_tbl_passthru_codec.c. The manipulation leads to integer overflow. The complexity of an attack is rather high. The exploitability is told to be difficult. A fix is planned for the upcoming version milestone of the project.
How severe is CVE-2026-5476?: CVE-2026-5476 has a CVSS 3.x base score of 4.6, rated medium severity. It is exploitable over an adjacent network with high attack complexity, requires low privileges and no user interaction. Impact on confidentiality is low, integrity low, and availability low.
Is CVE-2026-5476 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (11th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-5476?: CVE-2026-5476 affects Nasa Core Flight System. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-5476?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-5476 have an EU (EUVD) identifier?: Yes. CVE-2026-5476 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-18814.
When was CVE-2026-5476 published?: CVE-2026-5476 was published on 2026-04-03 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:nasa:core_flight_system:*:*:*:*:*:*:*:*

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CVE-2025-25371 — High (CVSS 7.5): NASA cFS (Core Flight System) Aquila is vulnerable to path traversal in the OSAL module, allowing the override of any…
CVE-2026-5474 — Medium (CVSS 6.3): A vulnerability was found in NASA cFS up to 7.0.0. This affects the function CFE_MSG_GetSize of the file…
CVE-2026-5475 — Medium (CVSS 5.5): A vulnerability was determined in NASA cFS up to 7.0.0. This impacts the function CFE_SB_TransmitMsg of the file…

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