{"description":"Trending threats, MITRE ATT\u0026CK coverage, and detection metadata. Fed continuously.","feed_url":"https://feed.craftedsignal.io/tags/cve-2026-40492/feed.json","home_page_url":"https://feed.craftedsignal.io/","items":[{"_cs_actors":[],"_cs_cpes":[],"_cs_cves":[{"cvss":9.8,"id":"CVE-2026-40492"},{"cvss":8.8,"id":"CVE-2026-27168"}],"_cs_exploited":false,"_cs_has_poc":false,"_cs_poc_references":[],"_cs_products":["SAIL library"],"_cs_severities":["critical"],"_cs_tags":["cve-2026-40492","sail","xwd","image-processing","memory-corruption"],"_cs_type":"advisory","_cs_vendors":["SAIL"],"content_html":"\u003cp\u003eThe SAIL (Simple API for Images Loading) library, a cross-platform tool used for loading and saving images, contains a critical vulnerability (CVE-2026-40492) within its XWD codec. This flaw stems from inconsistent handling of pixel format (\u003ccode\u003epixmap_depth\u003c/code\u003e) and bit depth (\u003ccode\u003ebits_per_pixel\u003c/code\u003e) during image processing. Specifically, the byte-swap code within the XWD codec incorrectly accesses memory when \u003ccode\u003epixmap_depth\u003c/code\u003e is set to 8 (indicating 1 byte per pixel) while \u003ccode\u003ebits_per_pixel\u003c/code\u003e is set to 32. This discrepancy causes the code to read and write 4x the allocated buffer size, resulting in an out-of-bounds memory access. This is a distinct vulnerability from CVE-2026-27168. The vulnerability was patched in commit 36aa5c7ec8a2bb35f6fb867a1177a6f141156b02. Successful exploitation could lead to application crashes, denial-of-service, or potentially arbitrary code execution.\u003c/p\u003e\n\u003ch2 id=\"attack-chain\"\u003eAttack Chain\u003c/h2\u003e\n\u003col\u003e\n\u003cli\u003eAn attacker crafts a malicious XWD image file with \u003ccode\u003epixmap_depth\u003c/code\u003e set to 8 and \u003ccode\u003ebits_per_pixel\u003c/code\u003e set to 32.\u003c/li\u003e\n\u003cli\u003eA user or application unknowingly processes the malicious XWD image file using the vulnerable SAIL library.\u003c/li\u003e\n\u003cli\u003eThe SAIL library's XWD codec attempts to decode the image.\u003c/li\u003e\n\u003cli\u003eDuring the byte-swapping process, the codec incorrectly calculates the memory access size based on \u003ccode\u003ebits_per_pixel\u003c/code\u003e (32) while using a buffer size based on \u003ccode\u003epixmap_depth\u003c/code\u003e (8).\u003c/li\u003e\n\u003cli\u003eThe byte-swap loop attempts to read and write 4 bytes per pixel, exceeding the allocated buffer size.\u003c/li\u003e\n\u003cli\u003eThis results in an out-of-bounds read and write operation, potentially overwriting adjacent memory regions.\u003c/li\u003e\n\u003cli\u003eIf the overwritten memory contains critical data or executable code, it could lead to application instability or code execution.\u003c/li\u003e\n\u003cli\u003eThe attacker achieves denial of service or potentially gains control of the affected system.\u003c/li\u003e\n\u003c/ol\u003e\n\u003ch2 id=\"impact\"\u003eImpact\u003c/h2\u003e\n\u003cp\u003eSuccessful exploitation of CVE-2026-40492 can have severe consequences. An attacker could cause applications using the SAIL library to crash, leading to denial of service. In more severe scenarios, the out-of-bounds write could be leveraged to execute arbitrary code, potentially allowing the attacker to gain control of the affected system. The number of potential victims is broad, as the SAIL library is used across multiple platforms and applications that process image files. Sectors that rely heavily on image processing, such as graphic design, medical imaging, and digital photography, are particularly at risk.\u003c/p\u003e\n\u003ch2 id=\"recommendation\"\u003eRecommendation\u003c/h2\u003e\n\u003cul\u003e\n\u003cli\u003eUpgrade the SAIL library to a version containing commit 36aa5c7ec8a2bb35f6fb867a1177a6f141156b02 or later to patch CVE-2026-40492.\u003c/li\u003e\n\u003cli\u003eMonitor applications that use the SAIL library for unexpected crashes or memory access violations (requires robust application logging).\u003c/li\u003e\n\u003cli\u003eConsider implementing input validation on image files to ensure that \u003ccode\u003epixmap_depth\u003c/code\u003e and \u003ccode\u003ebits_per_pixel\u003c/code\u003e values are consistent and within expected ranges, though this is not a complete defense and requires careful implementation.\u003c/li\u003e\n\u003c/ul\u003e\n","date_modified":"2024-01-24T12:00:00Z","date_published":"2024-01-24T12:00:00Z","id":"https://feed.craftedsignal.io/briefs/2024-01-24-sail-xwd-codec-oob-read/","summary":"A memory access vulnerability exists in the SAIL image library's XWD codec due to inconsistent handling of pixel format, potentially leading to crashes or code execution when processing specially crafted image files.","title":"SAIL Library XWD Codec Out-of-Bounds Read Vulnerability (CVE-2026-40492)","url":"https://feed.craftedsignal.io/briefs/2024-01-24-sail-xwd-codec-oob-read/"}],"language":"en","title":"CraftedSignal Threat Feed - Cve-2026-40492","version":"https://jsonfeed.org/version/1.1"}