{"description":"Trending threats, MITRE ATT\u0026CK coverage, and detection metadata. Fed continuously.","feed_url":"https://feed.craftedsignal.io/tags/cve-2026-42250/feed.json","home_page_url":"https://feed.craftedsignal.io/","items":[{"_cs_actors":[],"_cs_cpes":[],"_cs_cves":[{"id":"CVE-2026-42250"}],"_cs_exploited":false,"_cs_has_poc":false,"_cs_poc_references":[],"_cs_products":[],"_cs_severities":["high"],"_cs_tags":["cve-2026-42250","bzip2","out-of-bounds write","memory corruption","rce"],"_cs_type":"advisory","_cs_vendors":["Microsoft"],"content_html":"\u003cp\u003eCVE-2026-42250 is an off-by-one vulnerability in bzip2 that can lead to an out-of-bounds write. The specific details of the vulnerability are not provided in the source; however, the Microsoft Security Response Center has released information about it, suggesting it impacts systems where bzip2 is utilized. Defenders need to monitor for exploitation attempts targeting this vulnerability after exploitation details become public. The lack of specifics necessitates broad monitoring for anomalies related to bzip2 processing until further details emerge.\u003c/p\u003e\n\u003ch2 id=\"attack-chain\"\u003eAttack Chain\u003c/h2\u003e\n\u003col\u003e\n\u003cli\u003eAn attacker crafts a malicious bzip2 compressed file.\u003c/li\u003e\n\u003cli\u003eThe file is delivered to the target system through a vulnerable application or service.\u003c/li\u003e\n\u003cli\u003eThe target application attempts to decompress the malicious bzip2 file using the vulnerable bzip2 library.\u003c/li\u003e\n\u003cli\u003eDue to the off-by-one error, the decompression process writes data beyond the allocated buffer.\u003c/li\u003e\n\u003cli\u003eThis out-of-bounds write corrupts adjacent memory regions.\u003c/li\u003e\n\u003cli\u003eThe memory corruption can lead to arbitrary code execution.\u003c/li\u003e\n\u003cli\u003eThe attacker gains control of the affected process.\u003c/li\u003e\n\u003cli\u003eThe attacker pivots to further compromise the system.\u003c/li\u003e\n\u003c/ol\u003e\n\u003ch2 id=\"impact\"\u003eImpact\u003c/h2\u003e\n\u003cp\u003eSuccessful exploitation of CVE-2026-42250 can lead to arbitrary code execution within the context of the application processing the malicious bzip2 file. This could lead to complete system compromise, data breaches, or denial-of-service conditions. The scope of impact depends on the specific application utilizing the vulnerable bzip2 library.\u003c/p\u003e\n\u003ch2 id=\"recommendation\"\u003eRecommendation\u003c/h2\u003e\n\u003cul\u003e\n\u003cli\u003eMonitor process creation events for applications decompressing bzip2 files followed by suspicious activity (see Sigma rule \u003ccode\u003eDetect Suspicious bzip2 Decompression Followed by Shell\u003c/code\u003e).\u003c/li\u003e\n\u003cli\u003eImplement file integrity monitoring (FIM) on bzip2 library files to detect unauthorized modifications.\u003c/li\u003e\n\u003cli\u003eInvestigate any unexpected crashes or errors related to bzip2 decompression operations.\u003c/li\u003e\n\u003cli\u003eReview and harden applications that handle bzip2 compressed files.\u003c/li\u003e\n\u003c/ul\u003e\n","date_modified":"2026-05-29T07:25:07Z","date_published":"2026-05-29T07:25:07Z","id":"https://feed.craftedsignal.io/briefs/2026-05-cve-2026-42250-bzip2-oob-write/","summary":"CVE-2026-42250 is an off-by-one vulnerability leading to an out-of-bounds write in bzip2, for which Microsoft has released information.","title":"CVE-2026-42250 Off-by-One Leading to Out-of-Bounds Write in bzip2","url":"https://feed.craftedsignal.io/briefs/2026-05-cve-2026-42250-bzip2-oob-write/"}],"language":"en","title":"CraftedSignal Threat Feed — Cve-2026-42250","version":"https://jsonfeed.org/version/1.1"}