How severe is CVE-2026-2016?

CVE-2026-2016 has a CVSS 3.x base score of 5.3, rated medium severity. It is exploitable over local access with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is low, integrity low, and availability low.

Is CVE-2026-2016 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (17th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-2016?

CVE-2026-2016 affects Happyfish100 Libfastcommon. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-2016?

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

Does CVE-2026-2016 have an EU (EUVD) identifier?

Yes. CVE-2026-2016 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-5685.

When was CVE-2026-2016 published?

CVE-2026-2016 was published on 2026-02-06 and last updated on 2026-06-17.

CVE-2026-2016

CVE-2026-2016 is a medium-severity vulnerability in Happyfish100 Libfastcommon with a CVSS 3.x base score of 5.3. 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-787.

Key facts

Severity: Medium (CVSS 3.x base score 5.3)
CVSS v2: 4.3
CVSS v4: 1.9
EPSS exploit prediction: 0% (17th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-5685
Weakness: CWE-787
Affected product: Happyfish100 Libfastcommon
Published: 2026-02-06
Last modified: 2026-06-17

Description

A security vulnerability has been detected in happyfish100 libfastcommon up to 1.0.84. Affected by this vulnerability is the function base64_decode of the file src/base64.c. The manipulation leads to stack-based buffer overflow. Local access is required to approach this attack. The exploit has been disclosed publicly and may be used. The identifier of the patch is 82f66af3e252e3e137dba0c3891570f085e79adf. Applying a patch is the recommended action to fix this issue.

Frequently asked questions

What is CVE-2026-2016?: A security vulnerability has been detected in happyfish100 libfastcommon up to 1.0.84. Affected by this vulnerability is the function base64_decode of the file src/base64.c. The manipulation leads to stack-based buffer overflow. Local access is required to approach this attack. The exploit has been disclosed publicly and may be used. The identifier of the patch is 82f66af3e252e3e137dba0c3891570f085e79adf. Applying a patch is the recommended action to fix this issue.
How severe is CVE-2026-2016?: CVE-2026-2016 has a CVSS 3.x base score of 5.3, rated medium severity. It is exploitable over local access with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is low, integrity low, and availability low.
Is CVE-2026-2016 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (17th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-2016?: CVE-2026-2016 affects Happyfish100 Libfastcommon. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-2016?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-2016 have an EU (EUVD) identifier?: Yes. CVE-2026-2016 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-5685.
When was CVE-2026-2016 published?: CVE-2026-2016 was published on 2026-02-06 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:happyfish100:libfastcommon:*:*:*:*:*:*:*:*

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