CVE-2019-5066: An exploitable use-after-free vulnerability exists in the way LZW-compressed streams are processed in Aspose.P

This week

CRITICAL 9.8REMOTEDOWNGRADE

CVE-2019-5066 is a critical-severity flaw (CVSS 9.8) affecting aspose.pdf for c\+\+. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

An exploitable use-after-free vulnerability exists in the way LZW-compressed streams are processed in Aspose.PDF 19.2 for C++. A specially crafted PDF can cause a dangling heap pointer, resulting in a use-after-free condition. To trigger this vulnerability, a specifically crafted PDF document needs to be processed by the target application.

Why this priority

Critical severity
Public exploit reference
Remotely exploitable, no login, no user action

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	2.4% (top 16%)
CISA exploited list	No
Weakness	CWE-416
Published	2019-09-18
Last modified	2026-06-17

Publisher (CNA): Talos · Vendor: aspose

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2019-09-18 21:15 UTCPublished CVE record published
2026-06-17 02:37 UTCUpdated Record last modified

aspose aspose.pdf for c\+\+ DOWNGRADE

Affected: 19.2

Fixed in: no fixed release known

Safe to downgrade to: a release before 19.2

1. Check installed version

apt-cache policy aspose.pdf-for-c++ || rpm -q aspose.pdf-for-c++ || aspose.pdf-for-c++ --version

2. No fixed release: DOWNGRADE to a release before 19.2 (Debian / Ubuntu)

apt-cache madison aspose.pdf-for-c++ sudo apt install aspose.pdf-for-c++=<VERSION_BEFORE_19.2> sudo apt-mark hold aspose.pdf-for-c++

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list aspose.pdf-for-c++ sudo dnf downgrade aspose.pdf-for-c++-<VERSION_BEFORE_19.2> sudo dnf versionlock add aspose.pdf-for-c++

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.

Quick answers

How do I fix CVE-2019-5066?

aspose.pdf for c\+\+: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2019-5066 being exploited?

CVE-2019-5066 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-2019-5066 affect?

CVE-2019-5066 affects aspose.pdf for c\+\+. Severity is critical (CVSS 9.8). An exploitable use-after-free vulnerability exists in the way LZW-compressed streams are processed in Aspose.PDF 19.2 for C++. A specially crafted PDF can cause a dangling heap pointer, resulting in a use-after-free condition. To trigger th

How urgent is CVE-2019-5066?

Priority 65/100. Critical severity; Public exploit reference; Remotely exploitable, no login, no user action

Related CVEs

CVE-2019-5067 CRITICAL 9.8 DOWNGRADE An uninitialized memory access vulnerability exists in the way Aspose.PDF 19.2 for C++ handles invalid parent
CVE-2019-5042 HIGH 8.8 DOWNGRADE An exploitable Use-After-Free vulnerability exists in the way FunctionType 0 PDF elements are processed in Asp

References

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