{"description":"Trending threats, MITRE ATT\u0026CK coverage, and detection metadata. Fed continuously.","feed_url":"https://feed.craftedsignal.io/tags/pkcs%2312/feed.json","home_page_url":"https://feed.craftedsignal.io/","items":[{"_cs_actors":[],"_cs_cpes":[],"_cs_cves":[{"cvss":5.3,"id":"CVE-2026-42015"}],"_cs_exploited":false,"_cs_has_poc":false,"_cs_poc_references":[],"_cs_products":[],"_cs_severities":["high"],"_cs_tags":["cve","memory corruption","gnutls","pkcs#12"],"_cs_type":"advisory","_cs_vendors":["Microsoft"],"content_html":"\u003cp\u003eCVE-2026-42015 is a critical security vulnerability affecting GnuTLS, a widely used library for secure communication. The vulnerability stems from an off-by-one error in the handling of PKCS#12 bags, which can lead to memory corruption. This flaw could be exploited by attackers to potentially execute arbitrary code or cause a denial-of-service condition. While the specific version of GnuTLS affected isn\u0026rsquo;t provided, the vulnerability\u0026rsquo;s presence in PKCS#12 bag handling implies a broad scope across versions that support this functionality. Defenders need to prioritize patching GnuTLS to mitigate this vulnerability.\u003c/p\u003e\n\u003ch2 id=\"attack-chain\"\u003eAttack Chain\u003c/h2\u003e\n\u003col\u003e\n\u003cli\u003eAttacker crafts a malicious PKCS#12 file with a specially crafted bag.\u003c/li\u003e\n\u003cli\u003eThe application using GnuTLS attempts to parse the malicious PKCS#12 file.\u003c/li\u003e\n\u003cli\u003eGnuTLS processes the PKCS#12 bag.\u003c/li\u003e\n\u003cli\u003eDue to the off-by-one error, GnuTLS writes data beyond the allocated buffer.\u003c/li\u003e\n\u003cli\u003eMemory corruption occurs, potentially overwriting critical data structures.\u003c/li\u003e\n\u003cli\u003eThe attacker leverages the memory corruption to gain control of program execution.\u003c/li\u003e\n\u003cli\u003eArbitrary code is executed in the context of the vulnerable application.\u003c/li\u003e\n\u003cli\u003eAttacker achieves complete system compromise or causes a denial-of-service.\u003c/li\u003e\n\u003c/ol\u003e\n\u003ch2 id=\"impact\"\u003eImpact\u003c/h2\u003e\n\u003cp\u003eSuccessful exploitation of CVE-2026-42015 can lead to arbitrary code execution, potentially allowing attackers to gain complete control over affected systems. The memory corruption can also lead to denial-of-service conditions, disrupting critical services. Given the widespread use of GnuTLS in various applications and systems, the impact could be significant, potentially affecting numerous organizations and users.\u003c/p\u003e\n\u003ch2 id=\"recommendation\"\u003eRecommendation\u003c/h2\u003e\n\u003cul\u003e\n\u003cli\u003eApply the security updates provided by Microsoft to address CVE-2026-42015 as soon as they are available (reference: CVE-2026-42015).\u003c/li\u003e\n\u003cli\u003eDeploy the Sigma rule provided below to detect potential exploitation attempts targeting CVE-2026-42015 (reference: Sigma rule).\u003c/li\u003e\n\u003cli\u003eMonitor systems for any unusual activity related to PKCS#12 file processing.\u003c/li\u003e\n\u003cli\u003eConsider implementing additional security measures, such as address space layout randomization (ASLR) and data execution prevention (DEP), to further mitigate the impact of memory corruption vulnerabilities.\u003c/li\u003e\n\u003c/ul\u003e\n","date_modified":"2026-05-31T07:27:07Z","date_published":"2026-05-31T07:27:07Z","id":"https://feed.craftedsignal.io/briefs/2026-05-cve-2026-42015-gnutls/","summary":"CVE-2026-42015 is a memory corruption vulnerability due to an off-by-one error in PKCS#12 bag handling in GnuTLS.","title":"CVE-2026-42015 GnuTLS Memory Corruption Vulnerability in PKCS#12 Handling","url":"https://feed.craftedsignal.io/briefs/2026-05-cve-2026-42015-gnutls/"}],"language":"en","title":"CraftedSignal Threat Feed — Pkcs#12","version":"https://jsonfeed.org/version/1.1"}