PatchTheCVECVE-2018-12826: Adobe Flash Player 30.0.0.134 and earlier have an out-of-bounds read vulnerability
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HIGH 7.5REMOTEWATCHLISTUPGRADEUPGRADEUPGRADE
CVE-2018-12826 is a high-severity flaw (CVSS 7.5) affecting flash player, flash player, flash player. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.
Adobe Flash Player 30.0.0.134 and earlier have an out-of-bounds read vulnerability. Successful exploitation could lead to information disclosure.
Why this priority
- High severity
- EPSS top 6%: very likely to be exploited
- Remotely exploitable, no login, no user action
- On your watchlist
A fixed release or distro patch exists.
Risk facts
| CVSS score | 7.5 (High) |
| Attack vector | Network (remote) |
| Attack complexity | Low |
| Privileges needed | None |
| User interaction | None |
| EPSS exploit chance | 7.4% (top 6%) |
| CISA exploited list | No |
| Weakness | CWE-125 |
| Published | 2018-08-29 |
| Last modified | 2026-06-17 |
Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score
Am I affected?
Timeline
- Published CVE record published
- Updated Record last modified
adobe flash player UPGRADE
Affected: <= 30.0.0.154
Fixed in: newer than 30.0.0.154
Safe to downgrade to: no unaffected older release
1. Check installed version
apt-cache policy flash-player || rpm -q flash-player || flash-player --version
2. UPGRADE to newer than 30.0.0.154 (Debian / Ubuntu)
sudo apt update && sudo apt install --only-upgrade flash-player
2. UPGRADE (RHEL / Amazon Linux / Fedora)
sudo dnf upgrade flash-player
Note
Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.
adobe flash player UPGRADE
Affected: <= 30.0.0.154
Fixed in: newer than 30.0.0.154
Safe to downgrade to: no unaffected older release
1. Check installed version
apt-cache policy flash-player || rpm -q flash-player || flash-player --version
2. UPGRADE to newer than 30.0.0.154 (Debian / Ubuntu)
sudo apt update && sudo apt install --only-upgrade flash-player
2. UPGRADE (RHEL / Amazon Linux / Fedora)
sudo dnf upgrade flash-player
Note
Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.
adobe flash player UPGRADE
Affected: <= 30.0.0.154
Fixed in: newer than 30.0.0.154
Safe to downgrade to: no unaffected older release
1. Check installed version
apt-cache policy flash-player || rpm -q flash-player || flash-player --version
2. UPGRADE to newer than 30.0.0.154 (Debian / Ubuntu)
sudo apt update && sudo apt install --only-upgrade flash-player
2. UPGRADE (RHEL / Amazon Linux / Fedora)
sudo dnf upgrade flash-player
Note
Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.
adobe flash player UPGRADE
Affected: <= 30.0.0.154
Fixed in: newer than 30.0.0.154
Safe to downgrade to: no unaffected older release
1. Check installed version
apt-cache policy flash-player || rpm -q flash-player || flash-player --version
2. UPGRADE to newer than 30.0.0.154 (Debian / Ubuntu)
sudo apt update && sudo apt install --only-upgrade flash-player
2. UPGRADE (RHEL / Amazon Linux / Fedora)
sudo dnf upgrade flash-player
Note
Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.
redhat enterprise linux desktop MITIGATE
Affected: 6.0
Fixed in: no fixed release known
Safe to downgrade to: a release before 6.0
Check your OS release
cat /etc/os-release; uname -r
Debian / Ubuntu
sudo apt update && sudo apt full-upgrade
RHEL / Amazon Linux / Fedora
sudo dnf upgrade --refresh
Windows
Install the latest cumulative update from Windows Update
If no patch exists yet
OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.
redhat enterprise linux server MITIGATE
Affected: 6.0
Fixed in: no fixed release known
Safe to downgrade to: a release before 6.0
Check your OS release
cat /etc/os-release; uname -r
Debian / Ubuntu
sudo apt update && sudo apt full-upgrade
RHEL / Amazon Linux / Fedora
sudo dnf upgrade --refresh
Windows
Install the latest cumulative update from Windows Update
If no patch exists yet
OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.
Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.
Quick answers
How do I fix CVE-2018-12826?
flash player: upgrade to newer than 30.0.0.154; flash player: upgrade to newer than 30.0.0.154; flash player: upgrade to newer than 30.0.0.154. Exact commands for each OS are on this page.
Is CVE-2018-12826 being exploited?
CVE-2018-12826 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.
What does CVE-2018-12826 affect?
CVE-2018-12826 affects flash player, flash player, flash player. Severity is high (CVSS 7.5). Adobe Flash Player 30.0.0.134 and earlier have an out-of-bounds read vulnerability. Successful exploitation could lead to information disclosure.
How urgent is CVE-2018-12826?
Priority 60/100. High severity; EPSS top 6%: very likely to be exploited; Remotely exploitable, no login, no user action; On your watchlist
Software pages
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