CVE-2026-31899: CairoSVG is an SVG converter based on Cairo, a 2D graphics library

Q: How do I fix CVE-2026-31899?

cairosvg: upgrade to 2.9.0. Exact commands for each OS are on this page.

Q: Is CVE-2026-31899 being exploited?

CVE-2026-31899 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-31899 affect?

CVE-2026-31899 affects cairosvg. Severity is high (CVSS 7.5). CairoSVG is an SVG converter based on Cairo, a 2D graphics library. Prior to Kozea/CairoSVG has exponential denial of service via recursive element amplification in cairosvg/defs.py. This causes CPU exhaustion from a small input.

This week

HIGH 7.5REMOTEUPGRADE

CVE-2026-31899 is a high-severity flaw (CVSS 7.5) affecting cairosvg. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

CairoSVG is an SVG converter based on Cairo, a 2D graphics library. Prior to Kozea/CairoSVG has exponential denial of service via recursive <use> element amplification in cairosvg/defs.py. This causes CPU exhaustion from a small input.

Why this priority

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

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	0.5% (top 57%)
CISA exploited list	No
Weakness	CWE-674
Published	2026-03-13
Last modified	2026-06-17

Publisher (CNA): GitHub, Inc. · Vendor: courtbouillon

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

Am I affected?

Timeline

2026-03-13 19:54 UTCPublished CVE record published
2026-06-17 10:34 UTCUpdated Record last modified

courtbouillon cairosvg UPGRADE

Affected: < 2.9.0

Fixed in: 2.9.0

Safe to downgrade to: no unaffected older release

1. Check installed version

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

2. UPGRADE to 2.9.0 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade cairosvg

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

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-2026-31899?

cairosvg: upgrade to 2.9.0. Exact commands for each OS are on this page.

Is CVE-2026-31899 being exploited?

CVE-2026-31899 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-2026-31899 affect?

CVE-2026-31899 affects cairosvg. Severity is high (CVSS 7.5). CairoSVG is an SVG converter based on Cairo, a 2D graphics library. Prior to Kozea/CairoSVG has exponential denial of service via recursive <use> element amplification in cairosvg/defs.py. This causes CPU exhaustion from a small input.

How urgent is CVE-2026-31899?

Priority 47/100. High severity; Public exploit reference; Remotely exploitable, no login, no user action

References

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