{"description":"Trending threats, MITRE ATT\u0026CK coverage, and detection metadata. Fed continuously.","feed_url":"https://feed.craftedsignal.io/vendors/libbabl/feed.json","home_page_url":"https://feed.craftedsignal.io/","items":[{"_cs_actors":[],"_cs_cpes":[],"_cs_cves":[{"cvss":9.8,"id":"CVE-2020-37239"}],"_cs_exploited":false,"_cs_has_poc":false,"_cs_poc_references":[],"_cs_products":["libbabl 0.1.62"],"_cs_severities":["critical"],"_cs_tags":["double-free","memory corruption","cve-2020-37239","libbabl"],"_cs_type":"advisory","_cs_vendors":["libbabl"],"content_html":"\u003cp\u003elibbabl version 0.1.62 contains a critical vulnerability (CVE-2020-37239) related to double free detection. The vulnerability allows an attacker to bypass memory safety mechanisms by exploiting signature overwrites within freed memory chunks. Specifically, the issue arises when \u003ccode\u003ebabl_free()\u003c/code\u003e is called twice on the same memory address. The standard C library\u0026rsquo;s (\u003ccode\u003elibc\u003c/code\u003e) malloc metadata overwrites libbabl\u0026rsquo;s signature field upon the initial \u003ccode\u003efree()\u003c/code\u003e call. This overwrite prevents the double-free detection mechanism from triggering on the subsequent \u003ccode\u003ebabl_free()\u003c/code\u003e call, which could lead to memory corruption and arbitrary code execution. This vulnerability poses a significant risk to applications using the affected libbabl version.\u003c/p\u003e\n\u003ch2 id=\"attack-chain\"\u003eAttack Chain\u003c/h2\u003e\n\u003col\u003e\n\u003cli\u003eAn application using libbabl 0.1.62 allocates memory using \u003ccode\u003ebabl_malloc()\u003c/code\u003e.\u003c/li\u003e\n\u003cli\u003eThe allocated memory block contains babl\u0026rsquo;s metadata including a signature field.\u003c/li\u003e\n\u003cli\u003eThe application calls \u003ccode\u003ebabl_free()\u003c/code\u003e on the allocated memory block.\u003c/li\u003e\n\u003cli\u003e\u003ccode\u003elibc\u003c/code\u003e\u0026rsquo;s \u003ccode\u003efree()\u003c/code\u003e function overwrites babl\u0026rsquo;s metadata signature field with malloc metadata.\u003c/li\u003e\n\u003cli\u003eThe application erroneously calls \u003ccode\u003ebabl_free()\u003c/code\u003e again on the same memory block.\u003c/li\u003e\n\u003cli\u003eDue to the overwritten signature, babl\u0026rsquo;s double-free detection mechanism fails.\u003c/li\u003e\n\u003cli\u003eThe memory is freed again, corrupting the heap metadata.\u003c/li\u003e\n\u003cli\u003eSubsequent memory allocations may lead to arbitrary code execution due to the corrupted heap.\u003c/li\u003e\n\u003c/ol\u003e\n\u003ch2 id=\"impact\"\u003eImpact\u003c/h2\u003e\n\u003cp\u003eSuccessful exploitation of CVE-2020-37239 can lead to memory corruption and potentially arbitrary code execution within the context of the application using libbabl 0.1.62. This could allow an attacker to gain control of the application, potentially leading to data breaches, system compromise, or denial of service. Given the low level of interaction required to trigger the vulnerability, the impact is potentially very high.\u003c/p\u003e\n\u003ch2 id=\"recommendation\"\u003eRecommendation\u003c/h2\u003e\n\u003cul\u003e\n\u003cli\u003eUpgrade to a patched version of libbabl that addresses CVE-2020-37239.\u003c/li\u003e\n\u003cli\u003eApply memory debugging tools during development to identify and prevent double-free conditions in code that utilizes libbabl.\u003c/li\u003e\n\u003cli\u003eMonitor applications utilizing libbabl for unusual memory allocation patterns that may indicate exploitation attempts.\u003c/li\u003e\n\u003c/ul\u003e\n","date_modified":"2026-05-16T16:17:14Z","date_published":"2026-05-16T16:17:14Z","id":"https://feed.craftedsignal.io/briefs/2026-05-cve-2020-37239-libbabl-double-free/","summary":"libbabl 0.1.62 contains a double free vulnerability, identified as CVE-2020-37239, that allows attackers to bypass memory safety checks by exploiting signature overwriting in freed chunks, potentially leading to memory corruption and code execution.","title":"CVE-2020-37239 - libbabl Double Free Vulnerability","url":"https://feed.craftedsignal.io/briefs/2026-05-cve-2020-37239-libbabl-double-free/"}],"language":"en","title":"CraftedSignal Threat Feed — Libbabl","version":"https://jsonfeed.org/version/1.1"}