CVE-2026-33019

{"id": "CVE-2026-33019", "cveTags": [], "metrics": {"ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-33019", "role": "CISA Coordinator", "options": [{"exploitation": "poc"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "version": "2.0.3", "timestamp": "2026-04-15T18:54:19.432280Z"}}], "cvssMetricV31": [{"type": "Secondary", "source": "security-advisories@github.com", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 7.1, "attackVector": "LOCAL", "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:H", "integrityImpact": "NONE", "userInteraction": "REQUIRED", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "NONE", "confidentialityImpact": "HIGH"}, "impactScore": 5.2, "exploitabilityScore": 1.8}]}, "affected": [{"source": "security-advisories@github.com", "affectedData": [{"vendor": "saitoha", "product": "libsixel", "versions": [{"status": "affected", "version": "< 1.8.7-r1"}]}]}], "published": "2026-04-14T22:16:30.380", "references": [{"url": "https://github.com/saitoha/libsixel/releases/tag/v1.8.7-r1", "tags": ["Release Notes"], "source": "security-advisories@github.com"}, {"url": "https://github.com/saitoha/libsixel/security/advisories/GHSA-c854-ffg9-g72c", "tags": ["Exploit", "Vendor Advisory"], "source": "security-advisories@github.com"}, {"url": "https://github.com/saitoha/libsixel/security/advisories/GHSA-c854-ffg9-g72c", "tags": ["Exploit", "Vendor Advisory"], "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0"}], "vulnStatus": "Analyzed", "weaknesses": [{"type": "Secondary", "source": "security-advisories@github.com", "description": [{"lang": "en", "value": "CWE-125"}, {"lang": "en", "value": "CWE-190"}]}], "descriptions": [{"lang": "en", "value": "libsixel is a SIXEL encoder/decoder implementation derived from kmiya's sixel. Versions 1.8.7 and prior contain an integer overflow leading to an out-of-bounds heap read in the --crop option handling of img2sixel, where positive coordinates up to INT_MAX are accepted without overflow-safe bounds checking. In sixel_encoder_do_clip(), the expression clip_w + clip_x overflows to a large negative value when clip_x is INT_MAX, causing the bounds guard to be skipped entirely, and the unclamped coordinate is passed through sixel_frame_clip() to clip(), which computes a source pointer far beyond the image buffer and passes it to memmove(). An attacker supplying a specially crafted crop argument with any valid image can trigger an out-of-bounds read in the heap, resulting in a reliable crash and potential information disclosure. This issue has been fixed in version 1.8.7-r1."}, {"lang": "es", "value": "libsixel es una implementaci\u00f3n de codificador/decodificador SIXEL derivada de sixel de kmiya. Las versiones 1.8.7 y anteriores contienen un desbordamiento de entero que conduce a una lectura fuera de l\u00edmites en el heap en el manejo de la opci\u00f3n '--crop' de img2sixel, donde se aceptan coordenadas positivas hasta INT_MAX sin verificaci\u00f3n de l\u00edmites segura contra desbordamientos. En sixel_encoder_do_clip(), la expresi\u00f3n clip_w + clip_x desborda a un valor negativo grande cuando clip_x es INT_MAX, haciendo que la protecci\u00f3n de l\u00edmites se omita por completo, y la coordenada no restringida se pasa a trav\u00e9s de sixel_frame_clip() a clip(), que calcula un puntero de origen mucho m\u00e1s all\u00e1 del b\u00fafer de imagen y lo pasa a memmove(). Un atacante que proporciona un argumento de recorte ('crop') especialmente dise\u00f1ado con cualquier imagen v\u00e1lida puede desencadenar una lectura fuera de l\u00edmites en el heap, lo que resulta en un fallo ('crash') fiable y una potencial revelaci\u00f3n de informaci\u00f3n. Este problema ha sido solucionado en la versi\u00f3n 1.8.7-r1."}], "lastModified": "2026-07-25T10:10:00.167", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:a:saitoha:libsixel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "E16EAA6A-544F-4D16-829D-1B7C9979EA6A", "versionEndExcluding": "1.8.7-r1"}], "operator": "OR"}]}], "sourceIdentifier": "security-advisories@github.com"}