CVE-2025-25977: An issue in canvg v.4.0.2 allows an attacker to execute arbitrary code via the Constructor of the class StyleE

This week

CRITICAL 9.8REMOTEUPGRADE

CVE-2025-25977 is a critical-severity flaw (CVSS 9.8) affecting canvg. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

An issue in canvg v.4.0.2 allows an attacker to execute arbitrary code via the Constructor of the class StyleElement.

Why this priority

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

A fixed release or distro patch exists.

Risk facts

CVSS score	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.7% (top 46%)
CISA exploited list	No
Weakness	CWE-1321
Published	2025-03-10
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: canvg

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

Am I affected?

Timeline

2025-03-10 16:15 UTCPublished CVE record published
2026-06-17 09:01 UTCUpdated Record last modified

canvg canvg UPGRADE

Affected: < 3.0.11 · >= 4.0.0 and < 4.0.3

Fixed in: 3.0.11, 4.0.3

Safe to downgrade to: a release before 4.0.0

1. Check installed version

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

2. UPGRADE to 3.0.11 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade canvg

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade canvg

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 4.0.0 (Debian / Ubuntu)

apt-cache madison canvg sudo apt install canvg=<VERSION_BEFORE_4.0.0> sudo apt-mark hold canvg

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list canvg sudo dnf downgrade canvg-<VERSION_BEFORE_4.0.0> sudo dnf versionlock add canvg

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-2025-25977?

canvg: upgrade to 3.0.11, 4.0.3. Exact commands for each OS are on this page.

Is CVE-2025-25977 being exploited?

CVE-2025-25977 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-2025-25977 affect?

CVE-2025-25977 affects canvg. Severity is critical (CVSS 9.8). An issue in canvg v.4.0.2 allows an attacker to execute arbitrary code via the Constructor of the class StyleElement.

How urgent is CVE-2025-25977?

Priority 58/100. Critical severity; Public exploit reference; Remotely exploitable, no login, no user action

References

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