CVE-2025-64505

Information disclosure and crashes via malformed palette indices

Published Nov 24, 2025 · Updated Nov 25, 2025

Heap buffer over-read in png_do_quantize in PNG Development Group libpng before 1.6.51 allows attackers to leak heap data or crash applications. png_set_quantize sizes quantize_index from the file-controlled palette count, while png_do_quantize trusts pixel bytes as indices and reads beyond that allocation. Exploitation requires a user to process a crafted PNG; the resulting read can disclose adjacent heap memory or crash the consuming application.

CVSS severity6.1
Medium
EPSS probability0.19%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Heap buffer over-read in png_do_quantize in PNG Development Group libpng before 1.6.51 allows attackers to leak heap data or crash applications. png_set_quantize sizes quantize_index from the file-controlled palette count, while png_do_quantize trusts pixel bytes as indices and reads beyond that allocation. Exploitation requires a user to process a crafted PNG; the resulting read can disclose adjacent heap memory or crash the consuming application.

The record

CVE
CVE-2025-64505
Published
Nov 24, 2025
Updated
Nov 25, 2025
Vendor
PNG Development Group
Product
libpng
Classifications
CWE-125, T1204.002
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Nov 24, 2025CVE publishedPublication date reported by the CVE source.
  2. Nov 25, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 1.6.51

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

PNG Development Group · libpngversion=< 1.6.51

Published CVSS scores

6.1GitHubCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-125Out-of-bounds Read
T1204.002User Execution: Malicious File

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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