CVE-2019-19777

HIGHNVD 8.88.8—

8.8

stb_image.h (aka the stb image loader) 2.23, as used in libsixel and other products, has a heap-based buffer over-read in stbi__load_main.

CVSS v3: 8.8
EG Score: 8.8(medium)
EPSS: 59.2%
KEV: Not listed

Published

December 13, 2019

Last Modified

April 24, 2026

Advisory Details (1)

Auto-updated May 2, 2026

No patch confirmed yet.

generic

heap-buffer-overflow in stbi__load_main at stb_image.h:5580 · Issue #109 · saitoha/libsixel · GitHub

https://github.com/saitoha/libsixel/issues/109

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

CWE-125Out-of-bounds Read

Data Freshness Timeline

(refreshed 14× in last 7d / 20× in last 30d)

Every time one of our enrichment pipelines (NVD, MITRE cvelistV5, EPSS, CISA KEV, GHSA, OSV, vendor advisories) ran against this CVE. Most recent first.

2026-06-05 10:00 UTCOSV refresh
2026-06-05 06:08 UTCepss_batch
2026-06-05 06:08 UTCepss_batch
2026-06-04 13:10 UTCepss_batch
2026-06-04 13:10 UTCepss_batch
2026-06-02 20:11 UTCepss_batch
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2026-06-01 13:50 UTCepss_batch
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2026-05-31 22:29 UTCepss_batch
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2026-05-31 00:14 UTCepss_batch
2026-05-31 00:14 UTCepss_batch
2026-05-29 13:42 UTCepss_batch
2026-05-28 13:43 UTCepss_batch
2026-05-27 13:38 UTCepss_batch
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2026-05-26 13:42 UTCepss_batch
2026-05-26 07:17 UTCepss_batch
2026-05-26 07:17 UTCepss_batch

Frequently asked(5)

What is CVE-2019-19777?

CVE-2019-19777 is a high vulnerability published on December 13, 2019. stbimage.h (aka the stb image loader) 2.23, as used in libsixel and other products, has a heap-based buffer over-read in stbiloadmain.

When was CVE-2019-19777 disclosed?

CVE-2019-19777 was first published in the National Vulnerability Database on December 13, 2019, with the most recent update on April 24, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.

Is CVE-2019-19777 actively exploited?

CVE-2019-19777 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 59.2% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

What is the CVSS score of CVE-2019-19777?

CVE-2019-19777 has a CVSS v3 base score of 8.8 (NVD).

How do I remediate CVE-2019-19777?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2019-19777, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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CVE-2019-19777

📅 Published

🔄 Last Modified

📋 Advisory Details (1)

heap-buffer-overflow in stbi__load_main at stb_image.h:5580 · Issue #109 · saitoha/libsixel · GitHub

Weakness Classification(1)

Data Freshness Timeline

❓ Frequently asked(5)

Dependency Blast Radius

Is Your Infrastructure Affected by CVE-2019-19777?

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Last Modified

Advisory Details (1)

Frequently asked(5)

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