CVE-2025-64506: LIBPNG is a reference library for use in applications that read, create, and manipulate PNG (Portable Network

Routine

MEDIUM 6.1UPGRADE

CVE-2025-64506 is a medium-severity flaw (CVSS 6.1) affecting libpng. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

LIBPNG is a reference library for use in applications that read, create, and manipulate PNG (Portable Network Graphics) raster image files. From version 1.6.0 to before 1.6.51, a heap buffer over-read vulnerability exists in libpng's png_write_image_8bit function when processing 8-bit images through the simplified write API with convert_to_8bit enabled. The vulnerability affects 8-bit grayscale+alpha, RGB/RGBA, and images with incomplete row data

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	6.1 (Medium)
Attack vector	Local
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.1% (top 96%)
CISA exploited list	No
Weakness	CWE-125
Published	2025-11-25
Last modified	2026-10-18

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

Last updated 2026-10-18 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2025-11-25 00:15 UTCPublished CVE record published
2026-10-18 20:10 UTCUpdated Record last modified

libpng libpng UPGRADE

Affected: >= 1.6.0 and < 1.6.51

Fixed in: 1.6.51

Safe to downgrade to: a release before 1.6.0

1. Check installed version

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

2. UPGRADE to 1.6.51 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade libpng

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 1.6.0 (Debian / Ubuntu)

apt-cache madison libpng sudo apt install libpng=<VERSION_BEFORE_1.6.0> sudo apt-mark hold libpng

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

dnf --showduplicates list libpng sudo dnf downgrade libpng-<VERSION_BEFORE_1.6.0> sudo dnf versionlock add libpng

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-2025-64506?

libpng: upgrade to 1.6.51. Exact commands for each OS are on this page.

Is CVE-2025-64506 being exploited?

CVE-2025-64506 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-2025-64506 affect?

CVE-2025-64506 affects libpng. Severity is medium (CVSS 6.1). LIBPNG is a reference library for use in applications that read, create, and manipulate PNG (Portable Network Graphics) raster image files. From version 1.6.0 to before 1.6.51, a heap buffer over-read vulnerability exists in libpng's png_wr

How urgent is CVE-2025-64506?

Priority 22/100. No elevated risk signals yet.

Software pages

libpng vulnerabilities

Related CVEs

CVE-2026-34757 MEDIUM 5.1 UPGRADE MITIGATE LIBPNG is a reference library for use in applications that read, create, and manipulate PNG (Portable Network
CVE-2025-64720 HIGH 7.1 UPGRADE LIBPNG is a reference library for use in applications that read, create, and manipulate PNG (Portable Network
CVE-2025-65018 HIGH 7.1 UPGRADE LIBPNG is a reference library for use in applications that read, create, and manipulate PNG (Portable Network
CVE-2025-64505 MEDIUM 6.1 UPGRADE LIBPNG is a reference library for use in applications that read, create, and manipulate PNG (Portable Network
CVE-2025-66293 HIGH 7.1 UPGRADE LIBPNG is a reference library for use in applications that read, create, and manipulate PNG (Portable Network

References

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