CVE-2025-57248: A null pointer dereference vulnerability was discovered in SumatraPDF 3.5.2 during the processing of a crafted

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HIGH 7.3REMOTEDOWNGRADE

CVE-2025-57248 is a high-severity flaw (CVSS 7.3) affecting sumatrapdf. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

A null pointer dereference vulnerability was discovered in SumatraPDF 3.5.2 during the processing of a crafted .djvu file. When the file is opened, the application crashes inside libmupdf.dll, specifically in the DataPool::has_data() function.

Why this priority

High 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	7.3 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.2% (top 84%)
CISA exploited list	No
Weakness	CWE-476
Published	2025-09-15
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: sumatrapdfreader

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

Am I affected?

Timeline

2025-09-15 16:15 UTCPublished CVE record published
2026-06-17 09:42 UTCUpdated Record last modified

sumatrapdfreader sumatrapdf DOWNGRADE

Affected: 3.5.2

Fixed in: no fixed release known

Safe to downgrade to: a release before 3.5.2

1. Check installed version

apt-cache policy sumatrapdf || rpm -q sumatrapdf || sumatrapdf --version

2. No fixed release: DOWNGRADE to a release before 3.5.2 (Debian / Ubuntu)

apt-cache madison sumatrapdf sudo apt install sumatrapdf=<VERSION_BEFORE_3.5.2> sudo apt-mark hold sumatrapdf

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

dnf --showduplicates list sumatrapdf sudo dnf downgrade sumatrapdf-<VERSION_BEFORE_3.5.2> sudo dnf versionlock add sumatrapdf

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-2025-57248?

sumatrapdf: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2025-57248 being exploited?

CVE-2025-57248 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-2025-57248 affect?

CVE-2025-57248 affects sumatrapdf. Severity is high (CVSS 7.3). A null pointer dereference vulnerability was discovered in SumatraPDF 3.5.2 during the processing of a crafted .djvu file. When the file is opened, the application crashes inside libmupdf.dll, specifically in the DataPool::has_data() functi

How urgent is CVE-2025-57248?

Priority 39/100. High severity; Public exploit reference; Remotely exploitable, no login, no user action

Related CVEs

CVE-2026-23951 MEDIUM 5.5 MITIGATE SumatraPDF is a multi-format reader for Windows
CVE-2026-23512 HIGH 8.6 UPGRADE SumatraPDF is a multi-format reader for Windows

References

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