How severe is CVE-2025-64506?

CVE-2025-64506 has a CVSS 3.x base score of 6.1, rated medium severity. It is exploitable over local access with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity none, and availability high.

Is CVE-2025-64506 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (2nd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2025-64506?

CVE-2025-64506 affects Libpng. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2025-64506?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2025-64506 have an EU (EUVD) identifier?

Yes. CVE-2025-64506 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-199238.

When was CVE-2025-64506 published?

CVE-2025-64506 was published on 2025-11-25 and last updated on 2026-06-17.

CVE-2025-64506

CVE-2025-64506 is a medium-severity vulnerability in Libpng with a CVSS 3.x base score of 6.1. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-125.

Key facts

Severity: Medium (CVSS 3.x base score 6.1)
EPSS exploit prediction: 0% (2nd percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-199238
Weakness: CWE-125
Affected product: Libpng
Published: 2025-11-25
Last modified: 2026-06-17

Description

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. A conditional guard incorrectly allows 8-bit input to enter code expecting 16-bit input, causing reads up to 2 bytes beyond allocated buffer boundaries. This issue has been patched in version 1.6.51.

Frequently asked questions

What is CVE-2025-64506?: 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. A conditional guard incorrectly allows 8-bit input to enter code expecting 16-bit input, causing reads up to 2 bytes beyond allocated buffer boundaries. This issue has been patched in version 1.6.51.
How severe is CVE-2025-64506?: CVE-2025-64506 has a CVSS 3.x base score of 6.1, rated medium severity. It is exploitable over local access with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity none, and availability high.
Is CVE-2025-64506 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (2nd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2025-64506?: CVE-2025-64506 affects Libpng. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2025-64506?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2025-64506 have an EU (EUVD) identifier?: Yes. CVE-2025-64506 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-199238.
When was CVE-2025-64506 published?: CVE-2025-64506 was published on 2025-11-25 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:libpng:libpng:*:*:*:*:*:*:*:*

More vulnerabilities in Libpng

CVE-2017-12652 — Critical (CVSS 9.8): libpng before 1.6.32 does not properly check the length of chunks against the user limit.
CVE-2010-1205 — Critical (CVSS 9.8): Buffer overflow in pngpread.c in libpng before 1.2.44 and 1.4.x before 1.4.3, as used in progressive applications,…
CVE-2018-14550 — High (CVSS 8.8): An issue has been found in third-party PNM decoding associated with libpng 1.6.35. It is a stack-based buffer overflow…
CVE-2015-8540 — High (CVSS 8.8): Integer underflow in the png_check_keyword function in pngwutil.c in libpng 0.90 through 0.99, 1.0.x before 1.0.66,…
CVE-2015-0973 — High (CVSS 8.8): Buffer 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…
CVE-2014-9495 — High (CVSS 8.8): Heap-based buffer overflow in the png_combine_row function in libpng before 1.5.21 and 1.6.x before 1.6.16, when…

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Other CWE-125 (Out-of-bounds Read) vulnerabilities

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CVE-2013-0767 — Critical (CVSS 10.0): The nsSVGPathElement::GetPathLengthScale function in Mozilla Firefox before 18.0, Firefox ESR 10.x before 10.0.12 and…

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