How severe is CVE-2016-10166?

CVE-2016-10166 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2016-10166 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 11% (95th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2016-10166?

CVE-2016-10166 affects Libgd. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2016-10166?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

When was CVE-2016-10166 published?

CVE-2016-10166 was published on 2017-03-15 and last updated on 2026-06-17.

CVE-2016-10166

CVE-2016-10166 is a critical-severity vulnerability in Libgd with a CVSS 3.x base score of 9.8. Its EPSS exploit-prediction score of 11% places it in the 95th percentile, indicating an elevated likelihood of exploitation. The underlying weakness is classified as CWE-191.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
CVSS v2: 7.5
EPSS exploit prediction: 11% (95th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-191
Affected product: Libgd
Published: 2017-03-15
Last modified: 2026-06-17

Description

Integer underflow in the _gdContributionsAlloc function in gd_interpolation.c in the GD Graphics Library (aka libgd) before 2.2.4 allows remote attackers to have unspecified impact via vectors related to decrementing the u variable.

Frequently asked questions

What is CVE-2016-10166?: Integer underflow in the _gdContributionsAlloc function in gd_interpolation.c in the GD Graphics Library (aka libgd) before 2.2.4 allows remote attackers to have unspecified impact via vectors related to decrementing the u variable.
How severe is CVE-2016-10166?: CVE-2016-10166 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2016-10166 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 11% (95th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2016-10166?: CVE-2016-10166 affects Libgd. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2016-10166?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
When was CVE-2016-10166 published?: CVE-2016-10166 was published on 2017-03-15 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:libgd:libgd:*:*:*:*:*:*:*:*

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