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Fencer Intel
critical 9.8

CVE-2018-7186 json

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…

published 2018-02-16 8 y ago modified 2026-06-17 4 mo ago also EUVD-2018-18928

cvss
9.8
version 3.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
3.4%
EPSS 3.4% chance of exploitation in 30 days, percentile 88%
public exploits
0
none known

Summary

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.

Patch / fix

  • leptonica leptonica 1.75.3
  • leptonlib Debian 14, Debian 13, Debian 12 1.75.3-2

debian advisories DEBIAN-CVE-2018-7186

  • leptonlib Ubuntu Pro 14.04 LTS 1.70.1-1ubuntu0.1~esm1
  • leptonlib Ubuntu Pro 16.04 LTS 1.73-1ubuntu0.1~esm1

ubuntu advisories UBUNTU-CVE-2018-7186

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • leptonica openSUSE Tumbleweed 1.80.0-1.9

opensuse advisories openSUSE-SU-2024:10914-1

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2018-7186 updated cvss 3.3

leptonica: Stack-based buffer overflows in gplotRead() and ptaReadStream() when parsing crafted files can lead to denial of service

  • Red Hat All currently supported Red Hat products
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

3.40% chance of exploitation in the next 30 days, higher than 88% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by version score vector
NVD 3.0 9.8 CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
NVD 2.0 7.5 AV:N/AC:L/Au:N/C:P/I:P/A:P

Classification

Weakness

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.