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CVE-2025-64720· NVD / CVE Program· CNA GitHub_M

LIBPNG is vulnerable to a buffer overflow in `png_image_read_composite` via incorrect palette premultiplication

Noroxi assessment

Priority: Monitor (action score 28/100)

  • Public proof-of-concept code exists (GitHub); there is no record of exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.41% (FIRST EPSS).
  • Anyone who can reach it over the internet can trigger it. No account or password is required. A user must open a link or visit a page. No special conditions are required; it is repeatable.
  • Fixed version: pnggroup libpng 1.6.51; Windows 10 Version 1607 for 32-bit Systems 10.0.14393.9060; Windows 10 Version 1607 for x64-based Systems 10.0.14393.9060.

Low priority for now. Upgrade to pnggroup libpng 1.6.51; Windows 10 Version 1607 for 32-bit Systems 10.0.14393.9060; Windows 10 Version 1607 for x64-based Systems 10.0.14393.9060 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

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, an out-of-bounds read vulnerability exists in png_image_read_composite when processing palette images with PNG_FLAG_OPTIMIZE_ALPHA enabled. The palette compositing code in png_init_read_transformations incorrectly applies background compositing during premultiplication, violating the invariant component ≤ alpha × 257 required by the simplified PNG API. This issue has been patched in version 1.6.51.

HighCVSS 7.1 · v3.1—Proof of concept Fix available
Published
Nov 24, 2025
Updated
Jun 17, 2026
EPSS
0.4% · 34th percentile

Report tools

JSON

Action score

28

Monitor

Low priority for now.

CVSS
28 / 40 · 7.1 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.4%

CISA SSVC decision

Exploitation
proof of concept
Automatable
no
Technical impact
partial

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
—
CNA · GitHub_M
7.1
NVD has not scored this yet; the score shown is the CNA’s.

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

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  • Not in KEV: no record of exploitation in the wild
  • Proof of concept exists, no weaponized module
  • A fix has been released

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  • when exploit code appears or is weaponized
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  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

VendorProduct
libpnglibpng

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • libpng libpng1.6.0 and later · before 1.6.51

Versions reported by the vendor

Affected version ranges reported by the assigning authority (GitHub_M). Independent of NVD's CPE analysis and usually ahead of it.

  • pnggroup libpng

    • >= 1.6.0, < 1.6.51affected

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
AlmaLinux:10java-21-openjdkbefore 1:21.0.10.0.7-1.el10.alma.11:21.0.10.0.7-1.el10.alma.1
AlmaLinux:10java-21-openjdk-demobefore 1:21.0.10.0.7-1.el10.alma.11:21.0.10.0.7-1.el10.alma.1
AlmaLinux:10java-21-openjdk-demo-fastdebugbefore 1:21.0.10.0.7-1.el10.alma.11:21.0.10.0.7-1.el10.alma.1
AlmaLinux:10java-21-openjdk-demo-slowdebugbefore 1:21.0.10.0.7-1.el10.alma.11:21.0.10.0.7-1.el10.alma.1
AlmaLinux:10java-21-openjdk-develbefore 1:21.0.10.0.7-1.el10.alma.11:21.0.10.0.7-1.el10.alma.1
AlmaLinux:10java-21-openjdk-devel-fastdebugbefore 1:21.0.10.0.7-1.el10.alma.11:21.0.10.0.7-1.el10.alma.1
AlmaLinux:10java-21-openjdk-devel-slowdebugbefore 1:21.0.10.0.7-1.el10.alma.11:21.0.10.0.7-1.el10.alma.1
AlmaLinux:10java-21-openjdk-fastdebugbefore 1:21.0.10.0.7-1.el10.alma.11:21.0.10.0.7-1.el10.alma.1
AlmaLinux:10java-21-openjdk-headlessbefore 1:21.0.10.0.7-1.el10.alma.11:21.0.10.0.7-1.el10.alma.1
AlmaLinux:10java-21-openjdk-headless-fastdebugbefore 1:21.0.10.0.7-1.el10.alma.11:21.0.10.0.7-1.el10.alma.1
AlmaLinux:10java-21-openjdk-headless-slowdebugbefore 1:21.0.10.0.7-1.el10.alma.11:21.0.10.0.7-1.el10.alma.1
AlmaLinux:10java-21-openjdk-javadocbefore 1:21.0.10.0.7-1.el10.alma.11:21.0.10.0.7-1.el10.alma.1
AlmaLinux:10java-21-openjdk-javadoc-zipbefore 1:21.0.10.0.7-1.el10.alma.11:21.0.10.0.7-1.el10.alma.1
AlmaLinux:10java-21-openjdk-jmodsbefore 1:21.0.10.0.7-1.el10.alma.11:21.0.10.0.7-1.el10.alma.1
AlmaLinux:10java-21-openjdk-jmods-fastdebugbefore 1:21.0.10.0.7-1.el10.alma.11:21.0.10.0.7-1.el10.alma.1
AlmaLinux:10java-21-openjdk-jmods-slowdebugbefore 1:21.0.10.0.7-1.el10.alma.11:21.0.10.0.7-1.el10.alma.1
AlmaLinux:10java-21-openjdk-slowdebugbefore 1:21.0.10.0.7-1.el10.alma.11:21.0.10.0.7-1.el10.alma.1
AlmaLinux:10java-21-openjdk-srcbefore 1:21.0.10.0.7-1.el10.alma.11:21.0.10.0.7-1.el10.alma.1
AlmaLinux:10java-21-openjdk-src-fastdebugbefore 1:21.0.10.0.7-1.el10.alma.11:21.0.10.0.7-1.el10.alma.1
AlmaLinux:10java-21-openjdk-src-slowdebugbefore 1:21.0.10.0.7-1.el10.alma.11:21.0.10.0.7-1.el10.alma.1
AlmaLinux:10java-21-openjdk-static-libsbefore 1:21.0.10.0.7-1.el10.alma.11:21.0.10.0.7-1.el10.alma.1
AlmaLinux:10java-21-openjdk-static-libs-fastdebugbefore 1:21.0.10.0.7-1.el10.alma.11:21.0.10.0.7-1.el10.alma.1
AlmaLinux:10java-21-openjdk-static-libs-slowdebugbefore 1:21.0.10.0.7-1.el10.alma.11:21.0.10.0.7-1.el10.alma.1
AlmaLinux:10java-25-openjdkbefore 1:25.0.2.0.10-1.el101:25.0.2.0.10-1.el10

+96

Same product

libpng: all records

Other highest-scoring records for the same primary product.

  • CVE-2010-1205Buffer overflow in pngpread.c in libpng before 1.2.44 and 1.4.x before 1.4.3, as used in progressive applications, might allow remote attack
    52Plan
  • CVE-2017-12652libpng before 1.6.32 does not properly check the length of chunks against the user limit.
    40Plan
  • CVE-2015-8540Integer underflow in the png_check_keyword function in pngwutil.c in libpng 0.90 through 0.99, 1.0.x before 1.0.66, 1.1.x and 1.2.x before 1
    37Monitor
  • CVE-2018-14550An issue has been found in third-party PNM decoding associated with libpng 1.6.35.
    36Monitor
  • CVE-2015-0973Buffer overflow in the png_read_IDAT_data function in pngrutil.c in libpng before 1.5.21 and 1.6.x before 1.6.16 allows context-dependent at
    36Monitor
  • CVE-2014-9495Heap-based buffer overflow in the png_combine_row function in libpng before 1.5.21 and 1.6.x before 1.6.16, when running on 64-bit systems,
    36Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
pnggroup libpng1.6.51 · descriptionVendor (CNA)
Windows 10 Version 1607 for 32-bit Systems10.0.14393.9060 · KB5082198Microsoft (MSRC)
Windows 10 Version 1607 for x64-based Systems10.0.14393.9060 · KB5082198Microsoft (MSRC)
Windows 10 Version 1809 for 32-bit Systems10.0.17763.8644 · KB5082123Microsoft (MSRC)
Windows 10 Version 1809 for x64-based Systems10.0.17763.8644 · KB5082123Microsoft (MSRC)
Windows 10 Version 21H2 for 32-bit Systems10.0.19044.7184 · KB5082200Microsoft (MSRC)
Windows 10 Version 21H2 for ARM64-based Systems10.0.19044.7184 · KB5082200Microsoft (MSRC)
Windows 10 Version 21H2 for x64-based Systems10.0.19044.7184 · KB5082200Microsoft (MSRC)
Windows 10 Version 22H2 for 32-bit Systems10.0.19045.7184 · KB5082200Microsoft (MSRC)
Windows 10 Version 22H2 for ARM64-based Systems10.0.19045.7184 · KB5082200Microsoft (MSRC)
Windows 10 Version 22H2 for x64-based Systems10.0.19045.7184 · KB5082200Microsoft (MSRC)
Windows 11 Version 23H2 for ARM64-based Systems10.0.22631.6936 · KB5082052Microsoft (MSRC)
Windows 11 Version 23H2 for x64-based Systems10.0.22631.6936 · KB5082052Microsoft (MSRC)
Windows 11 Version 24H2 for ARM64-based Systems10.0.26100.8246 · KB5083769Microsoft (MSRC)
Windows 11 Version 24H2 for x64-based Systems10.0.26100.8246 · KB5083769Microsoft (MSRC)
Windows 11 Version 25H2 for ARM64-based Systems10.0.26200.8246 · KB5083769Microsoft (MSRC)
Windows 11 Version 25H2 for x64-based Systems10.0.26200.8246 · KB5083769Microsoft (MSRC)
Windows 11 Version 26H1 for ARM64-based Systems10.0.28000.1836 · KB5083768Microsoft (MSRC)
Windows 11 version 26H1 for x64-based Systems10.0.28000.1836 · KB5083768Microsoft (MSRC)
Windows Server 20126.2.9200.26026 · KB5082127Microsoft (MSRC)
Windows Server 2012 (Server Core installation)6.2.9200.26026 · KB5082127Microsoft (MSRC)
Windows Server 2012 R26.3.9600.23132 · KB5082126Microsoft (MSRC)
Windows Server 2012 R2 (Server Core installation)6.3.9600.23132 · KB5082126Microsoft (MSRC)
Windows Server 201610.0.14393.9060 · KB5082198Microsoft (MSRC)
Windows Server 2016 (Server Core installation)10.0.14393.9060 · KB5082198Microsoft (MSRC)
Windows Server 201910.0.17763.8644 · KB5082123Microsoft (MSRC)
Windows Server 2019 (Server Core installation)10.0.17763.8644 · KB5082123Microsoft (MSRC)
Windows Server 202210.0.20348.5020 · KB5082142Microsoft (MSRC)
Windows Server 2022 (Server Core installation)10.0.20348.5020 · KB5082142Microsoft (MSRC)
Windows Server 2022, 23H2 Edition (Server Core installation)10.0.25398.2274 · KB5082060Microsoft (MSRC)

+38

Exploit status

Proof of concept available

A public proof of concept or detection signature exists. Exploit knowledge is out there; don't delay patching.

Evidence

  • Proof-of-concept repository on GitHub ×1

Noroxi does not host or link to exploit code. Metasploit module names and Nuclei template ids are shown (names, not code); Exploit-DB entries and PoC repositories are given as counts only.

Public exploit evidence
SourceKindDate
Proof-of-concept repository on GitHubstars:02025-12-14

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

  1. Published
  2. First PoC+19 d
  3. TodayOct 13, 2026+323 d
EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

  • CVE-2026-2280149 days apartLIBPNG has an integer truncation causing heap buffer over-read in png_image_write_*
    31Monitor
  • CVE-2026-33636122 days apartLIBPNG has ARM NEON Palette Expansion Out-of-Bounds Read on AArch64
    30Monitor
  • CVE-2025-662939 days apartLIBPNG has an out-of-bounds read in png_image_read_composite
    28Monitor
  • CVE-2026-2269549 days apartLIBPNG has a heap buffer over-read in png_image_read_direct_scaled (regression from CVE-2025-65018 fix)
    28Monitor
  • CVE-2025-645050 days apartLIBPNG is vulnerable to a heap buffer overflow in `png_do_quantize` via malformed palette index
    24Monitor
  • CVE-2025-645060 days apartLIBPNG is vulnerable to a heap buffer over-read in `png_write_image_8bit` with grayscale+alpha or RGB/RGBA images
    24Monitor

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

  • Anyone who can reach it over the internet can trigger it.
  • No account or password is required.
  • A user must open a link or visit a page.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
low · data can be read
Integrity
none
Availability
high · the service can be disrupted
Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
Required
Scope
Unchanged
Confidentiality impact
Low
Integrity impact
None
Availability impact
High

Weakness class (CWE)

CWE-125 · Out-of-bounds Read

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:H

nvd-secondary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

ATT&CK techniques

—

Change log

  1. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Show all references (1 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records