CVE-2025-27363: FreeType Out-of-Bounds Write Vulnerability

Q: How do I fix CVE-2025-27363?

freetype: upgrade to newer than 2.13.0; debian linux: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Q: Is CVE-2025-27363 being exploited?

Yes. CVE-2025-27363 is on the CISA Known Exploited Vulnerabilities list, so treat it as patch-now.

Q: What does CVE-2025-27363 affect?

CVE-2025-27363 affects freetype, debian linux. Severity is high (CVSS 8.1). An out of bounds write exists in FreeType versions 2.13.0 and below (newer versions of FreeType are not vulnerable) when attempting to parse font subglyph structures related to TrueType GX and variable font files. The vulnerable code assign

Q: How urgent is CVE-2025-27363?

Priority 93/100. High severity; EPSS top 2%: very likely to be exploited; Exploited in the wild (CISA KEV); Public exploit reference; Remotely exploitable, no login, no user action; On your watchlist

Patch now

HIGH 8.1EXPLOITEDREMOTEWATCHLISTUPGRADEMITIGATE

CVE-2025-27363 is a high-severity flaw (CVSS 8.1) affecting freetype, debian linux, reported as exploited in the wild. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

An out of bounds write exists in FreeType versions 2.13.0 and below (newer versions of FreeType are not vulnerable) when attempting to parse font subglyph structures related to TrueType GX and variable font files. The vulnerable code assigns a signed short value to an unsigned long and then adds a static value causing it to wrap around and allocate too small of a heap buffer. The code then writes up to 6 signed long integers out of bounds relativ

Why this priority

High severity
EPSS top 2%: very likely to be exploited
Exploited in the wild (CISA KEV)
Public exploit reference
Remotely exploitable, no login, no user action
On your watchlist

A fixed release or distro patch exists.

Risk facts

CVSS score	8.1 (High)
Attack vector	Network (remote)
Attack complexity	High
Privileges needed	None
User interaction	None
EPSS exploit chance	27.8% (top 2%)
CISA exploited list	Yes, fix due 2025-05-27
Weakness	CWE-787
Published	2025-03-11
Last modified	2026-06-17

Publisher (CNA): Facebook, Inc. · Vendor: debian · freetype

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

Am I affected?

Timeline

2025-03-11 14:15 UTCPublished CVE record published
2025-05-06Exploited Added to the CISA Known Exploited Vulnerabilities list
2025-05-27Deadline CISA due date for US federal agencies to patch
2026-06-17 09:03 UTCUpdated Record last modified

freetype freetype UPGRADE

Affected: <= 2.13.0

Fixed in: newer than 2.13.0

Safe to downgrade to: no unaffected older release

1. Check installed version

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

2. UPGRADE to newer than 2.13.0 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade freetype

Note

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

debian debian linux MITIGATE

Affected: 11.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 11.0

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

Exact fixes by distribution

A distro patch exists: prefer upgrading over downgrading.

Fedora 46 · perl-WWW-OrangeHRM-Client · FIXED · 0.12.0-21.fc46 · FEDORA-2026-2d14efca09 · source

sudo dnf upgrade --advisory=FEDORA-2026-2d14efca09

Ubuntu 24.04 · freetype · NOT AFFECTED

Ubuntu 24.10 · freetype · NOT AFFECTED

Ubuntu 20.04 · freetype · FIXED · 2.10.1-2ubuntu0.4

sudo apt update && sudo apt install --only-upgrade freetype dpkg --compare-versions "$(dpkg-query -W -f='${Version}' freetype)" ge "2.10.1-2ubuntu0.4" && echo PATCHED || echo STILL-VULNERABLE

Ubuntu 22.04 · freetype · FIXED · 2.11.1+dfsg-1ubuntu0.3

sudo apt update && sudo apt install --only-upgrade freetype dpkg --compare-versions "$(dpkg-query -W -f='${Version}' freetype)" ge "2.11.1+dfsg-1ubuntu0.3" && echo PATCHED || echo STILL-VULNERABLE

Debian 12 · freetype · FIXED · 2.12.1+dfsg-5+deb12u4

sudo apt update && sudo apt install --only-upgrade freetype dpkg --compare-versions "$(dpkg-query -W -f='${Version}' freetype)" ge "2.12.1+dfsg-5+deb12u4" && echo PATCHED || echo STILL-VULNERABLE

Debian 13 · freetype · FIXED · 2.13.1+dfsg-1

sudo apt update && sudo apt install --only-upgrade freetype dpkg --compare-versions "$(dpkg-query -W -f='${Version}' freetype)" ge "2.13.1+dfsg-1" && echo PATCHED || echo STILL-VULNERABLE

RHEL 7 Extended Lifecycle Support · freetype · FIXED · freetype-2.8-15.el7_9.1

sudo dnf upgrade --advisory=RHSA-2025:3395 rpm -q freetype

RHEL 8 · mingw-freetype · FIXED · mingw-freetype-2.8-3.el8_10.1

sudo dnf upgrade --advisory=RHSA-2025:8292 rpm -q mingw-freetype

RHEL 8 · spice-client-win · FIXED · spice-client-win-8.10-1

sudo dnf upgrade --advisory=RHSA-2025:8292 rpm -q spice-client-win

RHEL 8 · freetype · FIXED · freetype-2.9.1-10.el8_10

sudo dnf upgrade --advisory=RHSA-2025:3421 rpm -q freetype

RHEL 8.2 Advanced Update Support · spice-client-win · FIXED · spice-client-win-8.2-1

sudo dnf upgrade --advisory=RHSA-2025:9380 rpm -q spice-client-win

Alpine 3.22 · freetype · FIXED · freetype-2.13.1-r0

apk add --upgrade freetype apk info -v freetype

Alpine 3.23 · freetype · FIXED · freetype-2.13.1-r0

apk add --upgrade freetype apk info -v freetype

Alpine 3.24 · freetype · FIXED · freetype-2.13.1-r0

apk add --upgrade freetype apk info -v freetype

Amazon Linux 2023 · see advisory · FIXED · ALAS2023-2025-925 · source

sudo dnf update --advisory=ALAS2023-2025-925

Amazon Linux 2 · see advisory · FIXED · ALAS2-2025-2806 · source

sudo yum update --advisory=ALAS2-2025-2806

Amazon Linux 1 · see advisory · FIXED · ALAS-2025-1976 · source

sudo yum update --advisory=ALAS-2025-1976

Public exploits and detection

Public code exists for this CVE. Treat unpatched systems as at risk, and only run PoCs in a lab.

GitHub PoC: zhuowei/CVE-2025-27363-proof-of-concept (40 stars)
GitHub PoC: tin-z/CVE-2025-27363 (32 stars)
GitHub PoC: ov3rf1ow/CVE-2025-27363 (3 stars)
Write-up: www.facebook.com/security/advisories/cve-2025-27363

Verify at the official source NVD · CVE Program · CISA KEV catalog · 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-2025-27363?

freetype: upgrade to newer than 2.13.0; debian linux: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2025-27363 being exploited?

Yes. CVE-2025-27363 is on the CISA Known Exploited Vulnerabilities list, so treat it as patch-now.

What does CVE-2025-27363 affect?

CVE-2025-27363 affects freetype, debian linux. Severity is high (CVSS 8.1). An out of bounds write exists in FreeType versions 2.13.0 and below (newer versions of FreeType are not vulnerable) when attempting to parse font subglyph structures related to TrueType GX and variable font files. The vulnerable code assign

How urgent is CVE-2025-27363?

Priority 93/100. High severity; EPSS top 2%: very likely to be exploited; Exploited in the wild (CISA KEV); Public exploit reference; Remotely exploitable, no login, no user action; On your watchlist

Software pages

Debian vulnerabilities

Related CVEs

CVE-2026-23865 MEDIUM 5.3 UPGRADE An integer overflow in the tt_var_load_item_variation_store function of the Freetype library in versions 2.13.
CVE-2025-23022 MEDIUM 4.0 DOWNGRADE FreeType 2.8.1 has a signed integer overflow in cf2_doFlex in cff/cf2intrp.c.

References

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