An update for libpng is now available for openEuler-24.03-LTS-SP2,openEuler-24.03-LTS-SP3,openEuler-20.03-LTS-SP4,openEuler-22.03-LTS-SP4,openEuler-24.03-LTS,openEuler-24.03-LTS-SP1 Security Advisory openeuler-security@openeuler.org openEuler security committee openEuler-SA-2026-1852 Final 1.0 1.0 2026-04-11 Initial 2026-04-11 2026-04-11 openEuler SA Tool V1.0 2026-04-11 libpng security update An update for libpng is now available for openEuler-24.03-LTS-SP2,openEuler-24.03-LTS-SP3,openEuler-20.03-LTS-SP4,openEuler-22.03-LTS-SP4,openEuler-24.03-LTS,openEuler-24.03-LTS-SP1 The libpng package contains libraries used by other programs for reading and writing PNG format files. The PNG format was designed as a replacement for GIF and, to a lesser extent, TIFF, with many improvements and extensions and lack of patent problems. Security Fix(es): LIBPNG is a reference library for use in applications that read, create, and manipulate PNG (Portable Network Graphics) raster image files. In versions 1.2.1 through 1.6.55, `png_set_tRNS` and `png_set_PLTE` each alias a heap-allocated buffer between `png_struct` and `png_info`, sharing a single allocation across two structs with independent lifetimes. The `trans_alpha` aliasing has been present since at least libpng 1.0, and the `palette` aliasing since at least 1.2.1. Both affect all prior release lines `png_set_tRNS` sets `png_ptr->trans_alpha = info_ptr->trans_alpha` (256-byte buffer) and `png_set_PLTE` sets `info_ptr->palette = png_ptr->palette` (768-byte buffer). In both cases, calling `png_free_data` (with `PNG_FREE_TRNS` or `PNG_FREE_PLTE`) frees the buffer through `info_ptr` while the corresponding `png_ptr` pointer remains dangling. Subsequent row-transform functions dereference and, in some code paths, write to the freed memory. A second call to `png_set_tRNS` or `png_set_PLTE` has the same effect, because both functions call `png_free_data` internally before reallocating the `info_ptr` buffer. Version 1.6.56 fixes the issue.(CVE-2026-33416) 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.(CVE-2026-33636) An update for libpng is now available for openEuler-24.03-LTS-SP2,openEuler-24.03-LTS-SP3,openEuler-20.03-LTS-SP4,openEuler-22.03-LTS-SP4,openEuler-24.03-LTS,openEuler-24.03-LTS-SP1. openEuler Security has rated this update as having a security impact of high. A Common Vunlnerability Scoring System(CVSS)base score,which gives a detailed severity rating, is available for each vulnerability from the CVElink(s) in the References section. High libpng https://www.openeuler.org/zh/security/security-bulletins/detail/?id=openEuler-SA-2026-1852 https://www.openeuler.org/en/security/cve/detail/?cveId=CVE-2026-33416 https://www.openeuler.org/en/security/cve/detail/?cveId=CVE-2026-33636 https://nvd.nist.gov/vuln/detail/CVE-2026-33416 https://nvd.nist.gov/vuln/detail/CVE-2026-33636 openEuler-24.03-LTS-SP2 openEuler-24.03-LTS-SP3 openEuler-20.03-LTS-SP4 openEuler-22.03-LTS-SP4 openEuler-24.03-LTS openEuler-24.03-LTS-SP1 libpng-1.6.40-8.oe2403sp2.src.rpm libpng-1.6.40-8.oe2403sp3.src.rpm libpng-1.6.37-7.oe2003sp4.src.rpm libpng-1.6.38-8.oe2203sp4.src.rpm libpng-1.6.40-8.oe2403.src.rpm libpng-1.6.40-8.oe2403sp1.src.rpm libpng-1.6.40-8.oe2403sp2.x86_64.rpm libpng-debuginfo-1.6.40-8.oe2403sp2.x86_64.rpm libpng-debugsource-1.6.40-8.oe2403sp2.x86_64.rpm libpng-devel-1.6.40-8.oe2403sp2.x86_64.rpm libpng-static-1.6.40-8.oe2403sp2.x86_64.rpm libpng-tools-1.6.40-8.oe2403sp2.x86_64.rpm libpng-1.6.40-8.oe2403sp3.x86_64.rpm libpng-debuginfo-1.6.40-8.oe2403sp3.x86_64.rpm libpng-debugsource-1.6.40-8.oe2403sp3.x86_64.rpm libpng-devel-1.6.40-8.oe2403sp3.x86_64.rpm libpng-static-1.6.40-8.oe2403sp3.x86_64.rpm libpng-tools-1.6.40-8.oe2403sp3.x86_64.rpm libpng-1.6.37-7.oe2003sp4.x86_64.rpm libpng-debuginfo-1.6.37-7.oe2003sp4.x86_64.rpm libpng-debugsource-1.6.37-7.oe2003sp4.x86_64.rpm libpng-devel-1.6.37-7.oe2003sp4.x86_64.rpm libpng-help-1.6.37-7.oe2003sp4.x86_64.rpm libpng-1.6.38-8.oe2203sp4.x86_64.rpm libpng-debuginfo-1.6.38-8.oe2203sp4.x86_64.rpm libpng-debugsource-1.6.38-8.oe2203sp4.x86_64.rpm libpng-devel-1.6.38-8.oe2203sp4.x86_64.rpm libpng-help-1.6.38-8.oe2203sp4.x86_64.rpm libpng-static-1.6.38-8.oe2203sp4.x86_64.rpm libpng-tools-1.6.38-8.oe2203sp4.x86_64.rpm libpng-1.6.40-8.oe2403.x86_64.rpm libpng-debuginfo-1.6.40-8.oe2403.x86_64.rpm libpng-debugsource-1.6.40-8.oe2403.x86_64.rpm libpng-devel-1.6.40-8.oe2403.x86_64.rpm libpng-static-1.6.40-8.oe2403.x86_64.rpm libpng-tools-1.6.40-8.oe2403.x86_64.rpm libpng-1.6.40-8.oe2403sp1.x86_64.rpm libpng-debuginfo-1.6.40-8.oe2403sp1.x86_64.rpm libpng-debugsource-1.6.40-8.oe2403sp1.x86_64.rpm libpng-devel-1.6.40-8.oe2403sp1.x86_64.rpm libpng-static-1.6.40-8.oe2403sp1.x86_64.rpm libpng-tools-1.6.40-8.oe2403sp1.x86_64.rpm libpng-help-1.6.40-8.oe2403sp2.noarch.rpm libpng-help-1.6.40-8.oe2403sp3.noarch.rpm libpng-help-1.6.40-8.oe2403.noarch.rpm libpng-help-1.6.40-8.oe2403sp1.noarch.rpm libpng-1.6.40-8.oe2403sp2.aarch64.rpm libpng-debuginfo-1.6.40-8.oe2403sp2.aarch64.rpm libpng-debugsource-1.6.40-8.oe2403sp2.aarch64.rpm libpng-devel-1.6.40-8.oe2403sp2.aarch64.rpm libpng-static-1.6.40-8.oe2403sp2.aarch64.rpm libpng-tools-1.6.40-8.oe2403sp2.aarch64.rpm libpng-1.6.40-8.oe2403sp3.aarch64.rpm libpng-debuginfo-1.6.40-8.oe2403sp3.aarch64.rpm libpng-debugsource-1.6.40-8.oe2403sp3.aarch64.rpm libpng-devel-1.6.40-8.oe2403sp3.aarch64.rpm libpng-static-1.6.40-8.oe2403sp3.aarch64.rpm libpng-tools-1.6.40-8.oe2403sp3.aarch64.rpm libpng-1.6.37-7.oe2003sp4.aarch64.rpm libpng-debuginfo-1.6.37-7.oe2003sp4.aarch64.rpm libpng-debugsource-1.6.37-7.oe2003sp4.aarch64.rpm libpng-devel-1.6.37-7.oe2003sp4.aarch64.rpm libpng-help-1.6.37-7.oe2003sp4.aarch64.rpm libpng-1.6.38-8.oe2203sp4.aarch64.rpm libpng-debuginfo-1.6.38-8.oe2203sp4.aarch64.rpm libpng-debugsource-1.6.38-8.oe2203sp4.aarch64.rpm libpng-devel-1.6.38-8.oe2203sp4.aarch64.rpm libpng-help-1.6.38-8.oe2203sp4.aarch64.rpm libpng-static-1.6.38-8.oe2203sp4.aarch64.rpm libpng-tools-1.6.38-8.oe2203sp4.aarch64.rpm libpng-1.6.40-8.oe2403.aarch64.rpm libpng-debuginfo-1.6.40-8.oe2403.aarch64.rpm libpng-debugsource-1.6.40-8.oe2403.aarch64.rpm libpng-devel-1.6.40-8.oe2403.aarch64.rpm libpng-static-1.6.40-8.oe2403.aarch64.rpm libpng-tools-1.6.40-8.oe2403.aarch64.rpm libpng-1.6.40-8.oe2403sp1.aarch64.rpm libpng-debuginfo-1.6.40-8.oe2403sp1.aarch64.rpm libpng-debugsource-1.6.40-8.oe2403sp1.aarch64.rpm libpng-devel-1.6.40-8.oe2403sp1.aarch64.rpm libpng-static-1.6.40-8.oe2403sp1.aarch64.rpm libpng-tools-1.6.40-8.oe2403sp1.aarch64.rpm LIBPNG is a reference library for use in applications that read, create, and manipulate PNG (Portable Network Graphics) raster image files. In versions 1.2.1 through 1.6.55, `png_set_tRNS` and `png_set_PLTE` each alias a heap-allocated buffer between `png_struct` and `png_info`, sharing a single allocation across two structs with independent lifetimes. The `trans_alpha` aliasing has been present since at least libpng 1.0, and the `palette` aliasing since at least 1.2.1. Both affect all prior release lines `png_set_tRNS` sets `png_ptr->trans_alpha = info_ptr->trans_alpha` (256-byte buffer) and `png_set_PLTE` sets `info_ptr->palette = png_ptr->palette` (768-byte buffer). In both cases, calling `png_free_data` (with `PNG_FREE_TRNS` or `PNG_FREE_PLTE`) frees the buffer through `info_ptr` while the corresponding `png_ptr` pointer remains dangling. Subsequent row-transform functions dereference and, in some code paths, write to the freed memory. A second call to `png_set_tRNS` or `png_set_PLTE` has the same effect, because both functions call `png_free_data` internally before reallocating the `info_ptr` buffer. Version 1.6.56 fixes the issue. 2026-04-11 CVE-2026-33416 openEuler-24.03-LTS-SP2 openEuler-24.03-LTS-SP3 openEuler-20.03-LTS-SP4 openEuler-22.03-LTS-SP4 openEuler-24.03-LTS openEuler-24.03-LTS-SP1 High 7.5 AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H libpng security update 2026-04-11 https://www.openeuler.org/zh/security/security-bulletins/detail/?id=openEuler-SA-2026-1852 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. 2026-04-11 CVE-2026-33636 openEuler-24.03-LTS-SP2 openEuler-24.03-LTS-SP3 openEuler-20.03-LTS-SP4 openEuler-22.03-LTS-SP4 openEuler-24.03-LTS openEuler-24.03-LTS-SP1 High 7.6 AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:H libpng security update 2026-04-11 https://www.openeuler.org/zh/security/security-bulletins/detail/?id=openEuler-SA-2026-1852