What is CVE-2018-20846?

CVE-2018-20846 is a medium-severity vulnerability in Uclouvain Openjpeg, classified under Improper Input Validation. CVSS score: 6.5/10. Published 2019-06-26.

How severe is CVE-2018-20846?

Medium severity. CVSS v3 base score is 6.5 out of 10.

Improper input validation in Uclouvain Openjpeg

CVE-2018-20846

Out-of-bounds accesses in the functions pi_next_lrcp, pi_next_rlcp, pi_next_rpcl, pi_next_pcrl, pi_next_rpcl, and pi_next_cprl in openmj2/pi.c in OpenJPEG through 2.3.0 allow remote attackers to cause a denial of service (application crash).

Vulnerability class: Drupalgeddon 2 (CVE-2018-7600)

Published 2019-06-26 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.022 (81.5th percentile), scored 2026-09-30.

Low probability of exploitation in the next 30 days, but still tracked. 82nd percentile — 81.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.022 · newest: 0.022 · change: 0.000

Affected products

Uclouvain Openjpeg

Weakness classification (CWE)

CWE-20 — Improper Input Validation

References

github.com/uclouvain/openjpeg/pull/1168/commits/c277159986c80142180fbe5efb256bb… (Patch)
www.securityfocus.com/bid/108921 (VDB Entry, Third Party Advisory, vdb-entry, Broken Link)

Frequently asked questions

What is CVE-2018-20846?: CVE-2018-20846 is a medium-severity vulnerability in Uclouvain Openjpeg, classified under Improper Input Validation. CVSS score: 6.5/10. Published 2019-06-26.
How severe is CVE-2018-20846?: Medium severity. CVSS v3 base score is 6.5 out of 10.