What’s Vulnerable › Vulnerabilities

CVE-2018-7186

• Severity: critical (CVSS 9.8 v3.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 3.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2018-02-16 · updated 2026-06-17
• Weakness: CWE-787

Description

Leptonica before 1.75.3 does not limit the number of characters in a %s format argument to fscanf or sscanf, which allows remote attackers to cause a denial of service (stack-based buffer overflow) or possibly have unspecified other impact via a long string, as demonstrated by the gplotRead and ptaReadStream functions.

Affected products

• Debian Linux: 7.0
• Leptonica: before 1.75.3 — fixed in 1.75.3

How to fix

Upgrade to a fixed version: Leptonica 1.75.3. Check the vendor advisory for mitigations.

References

• https://bugs.debian.org/890548
• https://github.com/DanBloomberg/leptonica/commit/ee301cb2029db8a6289c5295daa42bba7715e99a
• https://lists.debian.org/debian-lts-announce/2018/03/msg00005.html
• https://lists.debian.org/debian-lts/2018/02/msg00054.html
• https://security.gentoo.org/glsa/202312-01
• https://bugs.debian.org/890548
• https://github.com/DanBloomberg/leptonica/commit/ee301cb2029db8a6289c5295daa42bba7715e99a
• https://lists.debian.org/debian-lts-announce/2018/03/msg00005.html
• https://lists.debian.org/debian-lts/2018/02/msg00054.html
• https://security.gentoo.org/glsa/202312-01

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