Out-of-bounds Read Affecting java-25-openjdk-headless package, versions <1:25.0.3.0.9-1.el9.alma.1


Severity

Recommended
high

Based on AlmaLinux security rating.

Threat Intelligence

EPSS
0.74% (51st percentile)

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  • Snyk IDSNYK-ALMALINUX9-JAVA25OPENJDKHEADLESS-16264287
  • published25 Apr 2026
  • disclosed22 Apr 2026

Introduced: 22 Apr 2026

CVE-2026-33636  (opens in a new tab)
CWE-125  (opens in a new tab)
CWE-787  (opens in a new tab)

How to fix?

Upgrade AlmaLinux:9 java-25-openjdk-headless to version 1:25.0.3.0.9-1.el9.alma.1 or higher.
This issue was patched in ALSA-2026:9693.

NVD Description

Note: Versions mentioned in the description apply only to the upstream java-25-openjdk-headless package and not the java-25-openjdk-headless package as distributed by AlmaLinux. See How to fix? for AlmaLinux:9 relevant fixed versions and status.

LIBPNG is a reference library for use in applications that read, create, and manipulate PNG (Portable Network Graphics) raster image files. In versions 1.6.36 through 1.6.55, an out-of-bounds read and write exists in libpng's ARM/AArch64 Neon-optimized palette expansion path. When expanding 8-bit paletted rows to RGB or RGBA, the Neon loop processes a final partial chunk without verifying that enough input pixels remain. Because the implementation works backward from the end of the row, the final iteration dereferences pointers before the start of the row buffer (OOB read) and writes expanded pixel data to the same underflowed positions (OOB write). This is reachable via normal decoding of attacker-controlled PNG input if Neon is enabled. Version 1.6.56 fixes the issue.

CVSS Base Scores

version 3.1