{"resultsPerPage":1,"startIndex":0,"totalResults":1,"format":"NVD_CVE","version":"2.0","timestamp":"2026-05-05T04:45:53.999","vulnerabilities":[{"cve":{"id":"CVE-2026-33416","sourceIdentifier":"security-advisories@github.com","published":"2026-03-26T17:16:38.443","lastModified":"2026-04-02T20:28:33.973","vulnStatus":"Analyzed","cveTags":[],"descriptions":[{"lang":"en","value":"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."},{"lang":"es","value":"LIBPNG es una biblioteca de referencia para su uso en aplicaciones que leen, crean y manipulan archivos de imagen ráster PNG (Portable Network Graphics). En las versiones 1.2.1 a 1.6.55, 'png_set_tRNS' y 'png_set_PLTE' cada una aliasan un búfer asignado en el heap entre 'png_struct' y 'png_info', compartiendo una única asignación entre dos estructuras con vidas útiles independientes. El aliasing de 'trans_alpha' ha estado presente desde al menos libpng 1.0, y el aliasing de 'palette' desde al menos 1.2.1. Ambos afectan a todas las líneas de versiones anteriores: 'png_set_tRNS' establece 'png_ptr->trans_alpha = info_ptr->trans_alpha' (búfer de 256 bytes) y 'png_set_PLTE' establece 'info_ptr->palette = png_ptr->palette' (búfer de 768 bytes). En ambos casos, llamar a 'png_free_data' (con 'PNG_FREE_TRNS' o 'PNG_FREE_PLTE') libera el búfer a través de 'info_ptr' mientras que el puntero 'png_ptr' correspondiente permanece colgante. Las funciones de transformación de fila subsiguientes desreferencian y, en algunas rutas de código, escriben en la memoria liberada. Una segunda llamada a 'png_set_tRNS' o 'png_set_PLTE' tiene el mismo efecto, porque ambas funciones llaman internamente a 'png_free_data' antes de reasignar el búfer de 'info_ptr'. La versión 1.6.56 corrige el problema."}],"metrics":{"cvssMetricV31":[{"source":"security-advisories@github.com","type":"Secondary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H","baseScore":7.5,"baseSeverity":"HIGH","attackVector":"NETWORK","attackComplexity":"HIGH","privilegesRequired":"NONE","userInteraction":"REQUIRED","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"HIGH"},"exploitabilityScore":1.6,"impactScore":5.9}]},"weaknesses":[{"source":"security-advisories@github.com","type":"Primary","description":[{"lang":"en","value":"CWE-416"}]}],"configurations":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:a:libpng:libpng:*:*:*:*:*:*:*:*","versionStartIncluding":"1.2.1","versionEndExcluding":"1.6.56","matchCriteriaId":"C54F2804-F7D5-4BC5-B39A-44300C6A6F98"}]}]}],"references":[{"url":"https://github.com/pnggroup/libpng/commit/23019269764e35ed8458e517f1897bd3c54820eb","source":"security-advisories@github.com","tags":["Patch"]},{"url":"https://github.com/pnggroup/libpng/commit/7ea9eea884a2328cc7fdcb3c0c00246a50d90667","source":"security-advisories@github.com","tags":["Patch"]},{"url":"https://github.com/pnggroup/libpng/commit/a3a21443ed12bfa1ef46fa0d4fb2b74a0fa34a25","source":"security-advisories@github.com","tags":["Patch"]},{"url":"https://github.com/pnggroup/libpng/commit/c1b0318b393c90679e6fa5bc1d329fd5d5012ec1","source":"security-advisories@github.com","tags":["Patch"]},{"url":"https://github.com/pnggroup/libpng/pull/824","source":"security-advisories@github.com","tags":["Issue Tracking","Exploit"]},{"url":"https://github.com/pnggroup/libpng/security/advisories/GHSA-m4pc-p4q3-4c7j","source":"security-advisories@github.com","tags":["Patch","Vendor Advisory"]}]}}]}