TI-2025-39897 Aliases CVE-2025-64505

LIBPNG is vulnerable to a heap buffer overflow in `png_do_quantize` via malformed palette index

LOW 27CWE-125Published 2025-11-24 · Updated 2025-11-25

Key facts

Attack vector: Local
Privileges required: None
User interaction: Required
Attack complexity: Low
Impact type: —
Confidentiality · integrity · availability: Low · None · High
Fix status: Partial Red Hat: 1 fixed, 10 without a fix

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and Red Hat.

Summary

LIBPNG is a reference library for use in applications that read, create, and manipulate PNG (Portable Network Graphics) raster image files. Prior to version 1.6.51, a heap buffer over-read vulnerability exists in libpng's png_do_quantize function when processing PNG files with malformed palette indices. The vulnerability occurs when palette_lookup array bounds are not validated against externally-supplied image data, allowing an attacker to craft a PNG file with out-of-range palette indices that trigger out-of-bounds memory access. This issue has been patched in version 1.6.51.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.00205 10th percentileScored 2026-11-07

Fix Partial libpng (pnggroup): 1.6.51Red Hat: 1 advisoryRed Hat: 1 fixed, 10 without a fix

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: None
Automatable: No
Technical impact: Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
pnggroup	libpng	before 1.6.51	1.6.51	Patch available	CNA

libpng Vendorpnggroup Affected before 1.6.51 Fixed in 1.6.51 Patch available CNA

CPE configurations NVD · 1

CPE	Versions	Role	Vendor
cpe:2.3:a:libpng:libpng::::::::	before 1.6.51	Vulnerable	pnggroup

cpe:2.3:a:libpng:libpng:*:*:*:*:*:*:*:* Versions before 1.6.51 Vulnerable ·pnggroup

Remediation

Fix · CNA libpng (pnggroup) Fixed in 1.6.51

Red Hat 1 advisory

RHSA-2026:6732 Released 2026-04-07 · Red Hat rating Important
Red Hat Hardened Images RPMs bug fix and enhancement update
- Red Hat Hardened Images libpng-1.6.56-1.hum1@aarch64, libpng-1.6.56-1.hum1@src, libpng-1.6.56-1.hum1@x86_64 +6

Vendor assessments

Red Hat

Red Hat rating: Moderate. Red Hat's page for this CVE →

Product	Status	Plan or fix
Red Hat Enterprise Linux 10	Affected	No fix yet: Fix deferred
Red Hat Enterprise Linux 6	Affected	No fix yet: Fix deferred
Red Hat Enterprise Linux 7	Affected	No fix yet: Fix deferred
Red Hat Enterprise Linux 8	Affected	No fix yet: Fix deferred
Red Hat Enterprise Linux 9	Affected	No fix yet: Fix deferred
Red Hat OpenShift Container Platform 4	Affected	No fix yet: Fix deferred
Red Hat build of OpenJDK 1.8	Affected	No fix yet: Fix deferred
Red Hat build of OpenJDK 11 ELS	Affected	No fix yet: Fix deferred
Red Hat build of OpenJDK 17	Affected	No fix yet: Fix deferred
Red Hat build of OpenJDK 21	Affected	No fix yet: Fix deferred
Red Hat Hardened Images	Fixed	RHSA-2026:6732

Timeline

2026-10-02 Threatist record created from CVE-2025-64505

References

TI-2011-02683 Integer signedness error in the png_inflate function in pngrutil.c in libpng before… CVSS 3.1HIGH 8.8
TI-2010-01161 Buffer overflow in pngpread.c in libpng before 1.2.44 and 1.4.x before 1.4.3, as used in… CVSS 3.1CRITICAL 9.8
TI-2026-20746 LIBPNG has a heap buffer overflow in png_set_quantize CVSS 4.0HIGH 8.3
TI-2025-40204 LIBPNG is vulnerable to a heap buffer overflow in `png_combine_row` triggered via `png_image_finish_read` CVSS 3.1HIGH 7.1
TI-2025-40767 LIBPNG has an out-of-bounds read in png_image_read_composite CVSS 3.1HIGH 7.1
TI-2025-40066 LIBPNG is vulnerable to a buffer overflow in `png_image_read_composite` via incorrect palette premultiplication CVSS 3.1HIGH 7.1

See all 56 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences