CVE-2026-77219

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The over-read contents are interpreted as pixel color values and rendered on screen."}, {"lang": "es", "value": "GNU Emacs anterior a la versi\u00f3n 31.0.91 contiene un desbordamiento de entero en el cargador de im\u00e1genes PBM/PPM/PGM que permite a un atacante filtrar el contenido de la memoria heap al proporcionar una imagen manipulada con grandes dimensiones y un \u00edndice de color m\u00e1ximo elevado. El cargador de im\u00e1genes multiplica las dimensiones de la imagen y el n\u00famero de canales utilizando aritm\u00e9tica de enteros con signo; para valores suficientemente grandes, el resultado se ajusta a un n\u00famero negativo, eludiendo la comprobaci\u00f3n de l\u00edmites y haciendo que el lector de p\u00edxeles acceda a la memoria heap m\u00e1s all\u00e1 del final del b\u00fafer asignado. El contenido sobre-le\u00eddo se interpreta como valores de color de p\u00edxel y se renderiza en pantalla."}], "id": "CVE-2026-77219", "lastModified": "2026-10-12T16:10:00.220", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.1, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "REQUIRED", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 5.2, "source": "disclosure@vulncheck.com", "type": "Secondary"}], "cvssMetricV40": [{"cvssData": {"Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "Safety": "NOT_DEFINED", "attackComplexity": "LOW", "attackRequirements": "NONE", "attackVector": "LOCAL", "availabilityRequirement": "NOT_DEFINED", "baseScore": 6.9, "baseSeverity": "MEDIUM", "confidentialityRequirement": "NOT_DEFINED", "exploitMaturity": "NOT_DEFINED", "integrityRequirement": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "privilegesRequired": "NONE", "providerUrgency": "NOT_DEFINED", "subAvailabilityImpact": "NONE", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "userInteraction": "PASSIVE", "valueDensity": "NOT_DEFINED", "vectorString": "CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:H/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X", "version": "4.0", "vulnAvailabilityImpact": "HIGH", "vulnConfidentialityImpact": "HIGH", "vulnIntegrityImpact": "NONE", "vulnerabilityResponseEffort": "NOT_DEFINED"}, "source": "disclosure@vulncheck.com", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-77219", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-08-21T21:32:45.496424Z", "version": "2.0.3"}}]}, "published": "2026-08-21T21:17:06.590", "references": [{"source": "disclosure@vulncheck.com", "url": "https://debbugs.gnu.org/cgi/bugreport.cgi?bug=81344"}, {"source": "disclosure@vulncheck.com", "url": "https://github.com/emacs-mirror/emacs/commit/b07e634e4cf45162ae0178e32092b040587f2c6c"}, {"source": "disclosure@vulncheck.com", "url": "https://github.com/emacs-mirror/emacs/releases/tag/emacs-31.0.91"}, {"source": "disclosure@vulncheck.com", "url": "https://www.vulncheck.com/advisories/gnu-emacs-heap-over-read-via-pbm-ppm-pgm-image-loader"}], "sourceIdentifier": "disclosure@vulncheck.com", "vulnStatus": "Deferred", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-125"}, {"lang": "en", "value": "CWE-190"}], "source": "disclosure@vulncheck.com", "type": "Secondary"}]}

{"bugzilla": {"description": "emacs: GNU Emacs: Heap over-read leading to information disclosure via crafted image", "id": "2521196", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2521196"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.1", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:H", "status": "draft"}, "cwe": "CWE-125", "details": ["GNU Emacs before 31.0.91 contains an integer overflow in the PBM/PPM/PGM image loader that allows an attacker to leak heap memory contents by supplying a crafted image with large dimensions and an elevated max color index. The image loader multiplies image dimensions and channel count using signed integer arithmetic; for sufficiently large values, the result wraps to a negative number, bypassing the bounds check and causing the pixel reader to access heap memory past the end of the allocated buffer. The over-read contents are interpreted as pixel color values and rendered on screen.", "A flaw was found in GNU Emacs. An integer overflow in the PBM/PPM/PGM image loader allows a remote attacker to leak heap memory contents. By supplying a specially crafted image with large dimensions and an elevated maximum color index, the image loader's internal calculations can wrap to a negative number, bypassing memory bounds checks. This enables the pixel reader to access and render sensitive information from heap memory."], "mitigation": {"lang": "en:us", "value": "To mitigate this issue, users should avoid opening or displaying untrusted PBM, PPM, or PGM image files within GNU Emacs. Exercise caution when handling image files from unknown or unverified sources."}, "name": "CVE-2026-77219", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Affected", "package_name": "emacs", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Out of support scope", "package_name": "emacs", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Affected", "package_name": "emacs", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Affected", "package_name": "emacs", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "emacs", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-08-21T20:20:45Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-77219\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-77219\nhttps://debbugs.gnu.org/cgi/bugreport.cgi?bug=81344\nhttps://github.com/emacs-mirror/emacs/commit/b07e634e4cf45162ae0178e32092b040587f2c6c\nhttps://github.com/emacs-mirror/emacs/releases/tag/emacs-31.0.91\nhttps://www.vulncheck.com/advisories/gnu-emacs-heap-over-read-via-pbm-ppm-pgm-image-loader"], "threat_severity": "Important"}

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