Flash Player versions 31.0.0.122 and earlier have an out-of-bounds read vulnerability.

published 2018-11-29 7y ago modified 2026-06-17 4mo ago also EUVD-2018-7834

cvss: 7.5; version 3.0, NVD
cisa kev: Not listed; not in CISA's catalog
epss: 7.4%; EPSS 7.4% chance of exploitation in 30 days, percentile 94%
public exploits: 0; none known

Flash Player versions 31.0.0.122 and earlier have an out-of-bounds read vulnerability. Successful exploitation could lead to information disclosure.

Patch / fix

distros 1 links 1

flash-plugin RHEL 6 EXTRAS 31.0.0.148-1.el6_10

red hat advisories RHSA-2018:3618

helpx.adobe.com/security/products/flash-player/apsb18-39.html advisory

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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-2018-15978 updated 2026-06-28 cvss 6.5

flash-plugin: Information Disclosure vulnerability (APSB18-39)

Red Hat Enterprise Linux Desktop Supplementary (v. 6) flash-plugin 31.0.0.148-1.el6_10 Red Hat Enterprise Linux Server Supplementary (v. 6) flash-plugin 31.0.0.148-1.el6_10 Red Hat Enterprise Linux Workstation Supplementary (v. 6) flash-plugin 31.0.0.148-1.el6_10
fixed: vendor fix RHSA-2018:3618

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

7.43% chance of exploitation in the next 30 days, higher than 94% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by	version	score	vector
NVD	3.0	7.5	CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
NVD	2.0	5.0	AV:N/AC:L/Au:N/C:P/I:N/A:N

Classification

Weakness

CWE-125 Out-of-bounds Read

References

helpx.adobe.com /security/products/flash-player/apsb18-39.html
patch, vendor-advisory
access.redhat.com /errata/RHSA-2018:3618
vendor-advisory, third-party-advisory
securitytracker.com /id/1042098
vdb-entry, third-party-advisory
securityfocus.com /bid/105909
vdb-entry, third-party-advisory

Sources

CVE List CVE-2018-15978
NVD CVE-2018-15978

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