PatchTheCVECVE-2026-81991: Acrobat Reader is affected by an out-of-bounds read vulnerability that could lead to disclosure of sensitive m
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Routine
MEDIUM 5.5UPGRADEUPGRADEUPGRADE
CVE-2026-81991 is a medium-severity flaw (CVSS 5.5) affecting acrobat, acrobat dc, acrobat reader dc. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.
Acrobat Reader is affected by an out-of-bounds read vulnerability that could lead to disclosure of sensitive memory. An attacker could leverage this vulnerability to disclose sensitive information. Exploitation of this issue requires user interaction in that a victim must open a malicious file.
Why this priority
- No elevated risk signals yet
A fixed release or distro patch exists.
Risk facts
| CVSS score | 5.5 (Medium) |
| Attack vector | Local |
| Attack complexity | Low |
| Privileges needed | None |
| User interaction | Required |
| EPSS exploit chance | 0.3% (top 82%) |
| CISA exploited list | No |
| Weakness | CWE-125 |
| Published | 2026-09-08 |
| Last modified | 2026-09-10 |
Publisher (CNA): Adobe Systems Incorporated · Vendor: adobe
Last updated 2026-09-10 · 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 acrobat UPGRADE
Affected: >= 24.001.20604 and < 24.001.30429
Fixed in: 24.001.30429
Safe to downgrade to: a release before 24.001.20604
1. Check installed version
apt-cache policy acrobat || rpm -q acrobat || acrobat --version
2. UPGRADE to 24.001.30429 (Debian / Ubuntu)
sudo apt update && sudo apt install --only-upgrade acrobat
2. UPGRADE (RHEL / Amazon Linux / Fedora)
sudo dnf upgrade acrobat
Note
Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.
3. If no update is available yet, DOWNGRADE to a release before 24.001.20604 (Debian / Ubuntu)
apt-cache madison acrobat
sudo apt install acrobat=<VERSION_BEFORE_24.001.20604>
sudo apt-mark hold acrobat
3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)
dnf --showduplicates list acrobat
sudo dnf downgrade acrobat-<VERSION_BEFORE_24.001.20604>
sudo dnf versionlock add acrobat
Downgrade risk
Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.
After downgrade
Restart the service, and keep the package held until a fixed release ships.
adobe acrobat dc UPGRADE
Affected: >= 15.008.20082 and < 26.002.21901
Fixed in: 26.002.21901
Safe to downgrade to: a release before 15.008.20082
1. Check installed version
apt-cache policy acrobat-dc || rpm -q acrobat-dc || acrobat-dc --version
2. UPGRADE to 26.002.21901 (Debian / Ubuntu)
sudo apt update && sudo apt install --only-upgrade acrobat-dc
2. UPGRADE (RHEL / Amazon Linux / Fedora)
sudo dnf upgrade acrobat-dc
Note
Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.
3. If no update is available yet, DOWNGRADE to a release before 15.008.20082 (Debian / Ubuntu)
apt-cache madison acrobat-dc
sudo apt install acrobat-dc=<VERSION_BEFORE_15.008.20082>
sudo apt-mark hold acrobat-dc
3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)
dnf --showduplicates list acrobat-dc
sudo dnf downgrade acrobat-dc-<VERSION_BEFORE_15.008.20082>
sudo dnf versionlock add acrobat-dc
Downgrade risk
Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.
After downgrade
Restart the service, and keep the package held until a fixed release ships.
adobe acrobat reader dc UPGRADE
Affected: >= 15.008.20082 and < 26.002.21901
Fixed in: 26.002.21901
Safe to downgrade to: a release before 15.008.20082
1. Check installed version
apt-cache policy acrobat-reader-dc || rpm -q acrobat-reader-dc || acrobat-reader-dc --version
2. UPGRADE to 26.002.21901 (Debian / Ubuntu)
sudo apt update && sudo apt install --only-upgrade acrobat-reader-dc
2. UPGRADE (RHEL / Amazon Linux / Fedora)
sudo dnf upgrade acrobat-reader-dc
Note
Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.
3. If no update is available yet, DOWNGRADE to a release before 15.008.20082 (Debian / Ubuntu)
apt-cache madison acrobat-reader-dc
sudo apt install acrobat-reader-dc=<VERSION_BEFORE_15.008.20082>
sudo apt-mark hold acrobat-reader-dc
3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)
dnf --showduplicates list acrobat-reader-dc
sudo dnf downgrade acrobat-reader-dc-<VERSION_BEFORE_15.008.20082>
sudo dnf versionlock add acrobat-reader-dc
Downgrade risk
Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.
After downgrade
Restart the service, and keep the package held until a fixed release ships.
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-2026-81991?
acrobat: upgrade to 24.001.30429; acrobat dc: upgrade to 26.002.21901; acrobat reader dc: upgrade to 26.002.21901. Exact commands for each OS are on this page.
Is CVE-2026-81991 being exploited?
CVE-2026-81991 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-2026-81991 affect?
CVE-2026-81991 affects acrobat, acrobat dc, acrobat reader dc. Severity is medium (CVSS 5.5). Acrobat Reader is affected by an out-of-bounds read vulnerability that could lead to disclosure of sensitive memory. An attacker could leverage this vulnerability to disclose sensitive information. Exploitation of this issue requires user i
How urgent is CVE-2026-81991?
Priority 24/100. No elevated risk signals yet.
Software pages
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