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Cuando se llama a la funci\u00f3n sin histograma y el n\u00famero de colores en la paleta es m\u00e1s del doble del m\u00e1ximo soportado por la pantalla del usuario, ciertas paletas har\u00e1n que la funci\u00f3n entre en un bucle infinito que lee m\u00e1s all\u00e1 del final de un b\u00fafer interno asignado en el *heap*. Las im\u00e1genes que activan esta vulnerabilidad son v\u00e1lidas seg\u00fan la especificaci\u00f3n PNG. 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{"bugzilla": {"description": "libpng: LIBPNG has a heap buffer overflow in png_set_quantize", "id": "2438542", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2438542"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.0", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:H", "status": "draft"}, "cwe": "CWE-125", "details": ["No description is available for this CVE."], "mitigation": {"lang": "en:us", "value": "Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability."}, "name": "CVE-2026-25646", "package_state": [{"cpe": "cpe:/a:redhat:openjdk_els:11", "fix_state": "Affected", "package_name": "java-11-openjdk", "product_name": "Red Hat build of OpenJDK 11 ELS"}, {"cpe": "cpe:/a:redhat:openjdk_els:11", "fix_state": "Affected", "package_name": "java-11-openjdk-portable", "product_name": "Red Hat build of OpenJDK 11 ELS"}, {"cpe": "cpe:/a:redhat:openjdk:17", "fix_state": "Affected", "package_name": "java-17-openjdk-portable", "product_name": "Red Hat build of OpenJDK 17"}, {"cpe": "cpe:/a:redhat:openjdk:1.8", "fix_state": "Affected", "package_name": "java-1.8.0-openjdk-portable", "product_name": "Red Hat build of OpenJDK 1.8"}, {"cpe": "cpe:/a:redhat:openjdk:21", "fix_state": "Affected", "package_name": "java-21-openjdk-portable", "product_name": "Red Hat build of OpenJDK 21"}, {"cpe": "cpe:/a:redhat:openjdk:25", "fix_state": "Affected", "package_name": "java-25-openjdk-portable", "product_name": "Red Hat build of OpenJDK 25"}, {"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Affected", "package_name": "firefox", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Affected", "package_name": "java-21-openjdk", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:10", 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Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Affected", "package_name": "mingw-libpng", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Affected", "package_name": "thunderbird", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "firefox", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "java-17-openjdk", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "java-1.8.0-openjdk", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "java-21-openjdk", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "java-25-openjdk", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "libpng", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "libpng15", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "thunderbird", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/a:redhat:openshift:4", "fix_state": "Affected", "package_name": "rhcos", "product_name": "Red Hat OpenShift Container Platform 4"}], "public_date": "2026-02-10T17:04:38Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-25646\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-25646\nhttp://www.openwall.com/lists/oss-security/2026/02/09/7\nhttps://github.com/pnggroup/libpng/commit/01d03b8453eb30ade759cd45c707e5a1c7277d88\nhttps://github.com/pnggroup/libpng/security/advisories/GHSA-g8hp-mq4h-rqm3"], "threat_severity": "Important"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0,1.6.55)"}}], "product": "libpng", "vendor": "pnggroup"}], "analysis": {"en": {"generated_at": "2026-04-17T20:45:30.817664+00:00", "value": {"mitigation_remediation": ["Upgrade libpng to version\u202f1.6.55 or later, which contains a patch that removes the infinite loop and fixes the out\u2011of\u2011bounds read. ", "If an immediate upgrade is not possible, disable the png_set_quantize functionality or replace it with an alternative library that performs quantization safely. ", "Audit all software that incorporates libpng to verify the installed version and apply any vendor\u2011provided patches before the vulnerable code is executed."], "summary": {"action": "Immediate Patch", "impact": "Out-of-Bounds Read"}, "threat_synthesis": {"affected_systems": "The issue affects all libpng releases prior to version\u202f1.6.55. Any application that processes PNG files through libpng before this version is potentially vulnerable. The affected product is the libpng library available from the official project repository, and the vulnerability is documented for all builds below 1.6.55, including those distributed as part of Linux distributions or other software stacks that bundle libpng.", "description_and_impact": "A flaw exists in libpng\u2019s png_set_quantize function that triggers when the function is called with no histogram and the palette contains more than twice the maximum number of colors supported by the user\u2019s display. Under these conditions a specific palette can make the routine enter an infinite loop that reads past the end of an internally heap\u2011allocated buffer. The vulnerability corresponds to memory corruption weaknesses CWE\u2011122, CWE\u2011125 and CWE\u2011126. The primary impact is an unbounded read of memory, which could allow an attacker to read sensitive data from the process after decoding a crafted PNG image, but it does not provide a direct code\u2011execution path. Additionally the infinite loop can lead to a denial\u2011of\u2011service condition for the host process.", "risk_and_exploitability": "The CVSS score of 8.3 classifies this as a high\u2011severity risk, and while the EPSS score is less than 1% indicating a low current exploitation probability, the flaw is not listed in the CISA KEV catalog. Attackers would need to supply a crafted PNG file that satisfies the specific palette condition to an application that loads images using libpng, which could be a local attacker or a remote user if the application accepts untrusted image input from the network. Given the lack of a direct execution vector, the threat is primarily information disclosure and potential denial of service in a local context."}}}}, "created": "2026-02-10T21:41:59.584346+00:00", "updated": "2026-04-17T21:00:12.674870+00:00", "vendors": ["pnggroup", "pnggroup$PRODUCT$libpng"]}