Bug 2451819 (CVE-2026-33636) - CVE-2026-33636 libpng: libpng: Information disclosure and denial of service via out-of-bounds read/write in Neon palette expansion
Summary: CVE-2026-33636 libpng: libpng: Information disclosure and denial of service v...
Keywords:
Status: NEW
Alias: CVE-2026-33636
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Product Security DevOps Team
QA Contact:
URL:
Whiteboard:
Depends On: 2452107 2452108 2452110 2452111 2452112 2452113 2452114 2452115 2452117 2452118 2452120 2452121 2452122 2452123 2452124 2452125 2452128 2452130 2452131 2452133 2452116 2452119 2452129 2452132
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-03-26 18:03 UTC by OSIDB Bzimport
Modified: 2026-06-02 08:29 UTC (History)
17 users (show)

Fixed In Version:
Clone Of:
Environment:
Last Closed:
Embargoed:

Attachments (Terms of Use)


Links
System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHBA-2026:15894 0 None None None 2026-05-11 01:30:46 UTC
Red Hat Product Errata RHBA-2026:17586 0 None None None 2026-05-14 13:21:59 UTC
Red Hat Product Errata RHBA-2026:19708 0 None None None 2026-05-20 16:26:22 UTC
Red Hat Product Errata RHSA-2026:11805 0 None None None 2026-04-29 15:42:42 UTC
Red Hat Product Errata RHSA-2026:11813 0 None None None 2026-04-29 16:09:02 UTC
Red Hat Product Errata RHSA-2026:12264 0 None None None 2026-04-30 11:49:02 UTC
Red Hat Product Errata RHSA-2026:13342 0 None None None 2026-05-04 06:02:52 UTC
Red Hat Product Errata RHSA-2026:13412 0 None None None 2026-05-04 12:04:24 UTC
Red Hat Product Errata RHSA-2026:13533 0 None None None 2026-05-04 15:51:37 UTC
Red Hat Product Errata RHSA-2026:13582 0 None None None 2026-05-05 06:32:52 UTC
Red Hat Product Errata RHSA-2026:13583 0 None None None 2026-05-05 06:38:50 UTC
Red Hat Product Errata RHSA-2026:13596 0 None None None 2026-05-05 06:30:28 UTC
Red Hat Product Errata RHSA-2026:13600 0 None None None 2026-05-05 06:48:44 UTC
Red Hat Product Errata RHSA-2026:13665 0 None None None 2026-05-05 09:25:47 UTC
Red Hat Product Errata RHSA-2026:13682 0 None None None 2026-05-05 10:14:45 UTC
Red Hat Product Errata RHSA-2026:13683 0 None None None 2026-05-05 10:20:56 UTC
Red Hat Product Errata RHSA-2026:13922 0 None None None 2026-05-06 07:07:26 UTC
Red Hat Product Errata RHSA-2026:13977 0 None None None 2026-05-06 11:36:12 UTC
Red Hat Product Errata RHSA-2026:14223 0 None None None 2026-05-06 16:54:55 UTC
Red Hat Product Errata RHSA-2026:14303 0 None None None 2026-05-06 19:18:02 UTC
Red Hat Product Errata RHSA-2026:14790 0 None None None 2026-05-07 13:24:44 UTC
Red Hat Product Errata RHSA-2026:14791 0 None None None 2026-05-07 15:46:34 UTC
Red Hat Product Errata RHSA-2026:15889 0 None None None 2026-05-11 01:32:58 UTC
Red Hat Product Errata RHSA-2026:17524 0 None None None 2026-05-14 10:59:19 UTC
Red Hat Product Errata RHSA-2026:17567 0 None None None 2026-05-14 12:58:30 UTC
Red Hat Product Errata RHSA-2026:17603 0 None None None 2026-05-14 14:17:42 UTC
Red Hat Product Errata RHSA-2026:17642 0 None None None 2026-05-14 15:46:32 UTC
Red Hat Product Errata RHSA-2026:17685 0 None None None 2026-05-14 18:53:10 UTC
Red Hat Product Errata RHSA-2026:7671 0 None None None 2026-04-13 02:23:52 UTC
Red Hat Product Errata RHSA-2026:7672 0 None None None 2026-04-13 02:19:48 UTC
Red Hat Product Errata RHSA-2026:8052 0 None None None 2026-04-14 11:32:47 UTC
Red Hat Product Errata RHSA-2026:8459 0 None None None 2026-04-16 12:51:33 UTC
Red Hat Product Errata RHSA-2026:9345 0 None None None 2026-04-21 15:02:23 UTC
Red Hat Product Errata RHSA-2026:9638 0 None None None 2026-04-22 07:35:52 UTC

Description OSIDB Bzimport 2026-03-26 18:03:16 UTC 
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.
Comment 2 errata-xmlrpc 2026-04-13 02:19:46 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 10

Via RHSA-2026:7672 https://access.redhat.com/errata/RHSA-2026:7672
Comment 3 errata-xmlrpc 2026-04-13 02:23:49 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9

Via RHSA-2026:7671 https://access.redhat.com/errata/RHSA-2026:7671
Comment 4 errata-xmlrpc 2026-04-14 11:32:45 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2026:8052 https://access.redhat.com/errata/RHSA-2026:8052
Comment 5 errata-xmlrpc 2026-04-16 12:51:31 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9

Via RHSA-2026:8459 https://access.redhat.com/errata/RHSA-2026:8459
Comment 6 errata-xmlrpc 2026-04-21 15:02:21 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2026:9345 https://access.redhat.com/errata/RHSA-2026:9345
Comment 7 errata-xmlrpc 2026-04-22 07:35:50 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 10

Via RHSA-2026:9638 https://access.redhat.com/errata/RHSA-2026:9638
Comment 8 errata-xmlrpc 2026-04-29 15:42:40 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8.2 Advanced Update Support

Via RHSA-2026:11805 https://access.redhat.com/errata/RHSA-2026:11805
Comment 9 errata-xmlrpc 2026-04-29 16:09:00 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 10.0 Extended Update Support

Via RHSA-2026:11813 https://access.redhat.com/errata/RHSA-2026:11813
Comment 10 errata-xmlrpc 2026-04-30 11:49:00 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.0 Update Services for SAP Solutions

Via RHSA-2026:12264 https://access.redhat.com/errata/RHSA-2026:12264
Comment 11 errata-xmlrpc 2026-05-04 06:02:51 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.6 Extended Update Support

Via RHSA-2026:13342 https://access.redhat.com/errata/RHSA-2026:13342
Comment 12 errata-xmlrpc 2026-05-04 12:04:21 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions

Via RHSA-2026:13412 https://access.redhat.com/errata/RHSA-2026:13412
Comment 13 errata-xmlrpc 2026-05-04 15:51:35 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.4 Extended Update Support

Via RHSA-2026:13533 https://access.redhat.com/errata/RHSA-2026:13533
Comment 14 errata-xmlrpc 2026-05-05 06:30:26 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.0 Update Services for SAP Solutions

Via RHSA-2026:13596 https://access.redhat.com/errata/RHSA-2026:13596
Comment 15 errata-xmlrpc 2026-05-05 06:32:50 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.4 Extended Update Support

Via RHSA-2026:13582 https://access.redhat.com/errata/RHSA-2026:13582
Comment 16 errata-xmlrpc 2026-05-05 06:38:48 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.6 Extended Update Support

Via RHSA-2026:13583 https://access.redhat.com/errata/RHSA-2026:13583
Comment 17 errata-xmlrpc 2026-05-05 06:48:41 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support
  Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On

Via RHSA-2026:13600 https://access.redhat.com/errata/RHSA-2026:13600
Comment 18 errata-xmlrpc 2026-05-05 09:25:45 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 10.0 Extended Update Support

Via RHSA-2026:13665 https://access.redhat.com/errata/RHSA-2026:13665
Comment 19 errata-xmlrpc 2026-05-05 10:14:43 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions
  Red Hat Enterprise Linux 8.8 Telecommunications Update Service

Via RHSA-2026:13682 https://access.redhat.com/errata/RHSA-2026:13682
Comment 20 errata-xmlrpc 2026-05-05 10:20:55 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support
  Red Hat Enterprise Linux 8.6 Update Services for SAP Solutions
  Red Hat Enterprise Linux 8.6 Telecommunications Update Service

Via RHSA-2026:13683 https://access.redhat.com/errata/RHSA-2026:13683
Comment 21 errata-xmlrpc 2026-05-06 07:07:24 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions

Via RHSA-2026:13922 https://access.redhat.com/errata/RHSA-2026:13922
Comment 22 errata-xmlrpc 2026-05-06 11:36:10 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7 Extended Lifecycle Support

Via RHSA-2026:13977 https://access.redhat.com/errata/RHSA-2026:13977
Comment 23 errata-xmlrpc 2026-05-06 16:54:53 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions
  Red Hat Enterprise Linux 8.8 Telecommunications Update Service

Via RHSA-2026:14223 https://access.redhat.com/errata/RHSA-2026:14223
Comment 24 errata-xmlrpc 2026-05-06 19:18:00 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support
  Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On

Via RHSA-2026:14303 https://access.redhat.com/errata/RHSA-2026:14303
Comment 25 errata-xmlrpc 2026-05-07 13:24:42 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 10

Via RHSA-2026:14790 https://access.redhat.com/errata/RHSA-2026:14790
Comment 26 errata-xmlrpc 2026-05-07 15:46:32 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9

Via RHSA-2026:14791 https://access.redhat.com/errata/RHSA-2026:14791
Comment 27 errata-xmlrpc 2026-05-11 01:32:56 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support
  Red Hat Enterprise Linux 8.6 Update Services for SAP Solutions
  Red Hat Enterprise Linux 8.6 Telecommunications Update Service

Via RHSA-2026:15889 https://access.redhat.com/errata/RHSA-2026:15889
Comment 29 errata-xmlrpc 2026-05-14 10:59:17 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.6 Extended Update Support

Via RHSA-2026:17524 https://access.redhat.com/errata/RHSA-2026:17524
Comment 30 errata-xmlrpc 2026-05-14 12:58:28 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 10.0 Extended Update Support

Via RHSA-2026:17567 https://access.redhat.com/errata/RHSA-2026:17567
Comment 31 errata-xmlrpc 2026-05-14 14:17:40 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.4 Extended Update Support

Via RHSA-2026:17603 https://access.redhat.com/errata/RHSA-2026:17603
Comment 32 errata-xmlrpc 2026-05-14 15:46:30 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions

Via RHSA-2026:17642 https://access.redhat.com/errata/RHSA-2026:17642
Comment 33 errata-xmlrpc 2026-05-14 18:53:08 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.0 Update Services for SAP Solutions

Via RHSA-2026:17685 https://access.redhat.com/errata/RHSA-2026:17685
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