What’s Vulnerable › Vulnerabilities

CVE-2026-110605: libschrift through 0.10.2 Divide by Zero via unitsPerEm in draw_line

• Severity: medium (CVSS 5.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-10-14 · updated 2026-10-26
• Weakness: CWE-369

Description

libschrift through 0.10.2 contains a divide by zero vulnerability that allows attackers to crash applications by supplying a font with unitsPerEm of 0 in the head table. Attackers can provide a crafted TrueType font whose NaN glyph coordinates bypass clip_points(), causing an out-of-bounds raster read in draw_line() during sft_render() and crashing the process.

Affected products

• tomolt libschrift: through 0.10.2

References

• https://github.com/tomolt/libschrift/blob/v0.10.2/schrift.c#L1422-L1503
• https://github.com/tomolt/libschrift/blob/v0.10.2/schrift.c#L542
• https://github.com/tomolt/libschrift/issues/46
• https://hackmd.io/@haind-pwn/libschrift-unitsperem-zero-oob
• https://www.vulncheck.com/advisories/libschrift-through-0.10.2-divide-by-zero-via-unitsperem-in-draw-line
• https://github.com/tomolt/libschrift/issues/46
• https://hackmd.io/@haind-pwn/libschrift-unitsperem-zero-oob

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