{"cve":"CVE-2026-39973","nvd":{"published":"2026-04-21T02:16:07.903","modified":"2026-10-26T22:10:00.163","status":"Analyzed","description":"Apktool is a tool for reverse engineering Android APK files. In versions 3.0.0 and 3.0.1, a path traversal vulnerability in `brut/androlib/res/decoder/ResFileDecoder.java` allows a maliciously crafted APK to write arbitrary files to the filesystem during standard decoding (`apktool d`). This is a security regression introduced in commit e10a045 (PR #4041, December 12, 2025), which removed the `BrutIO.sanitizePath()` call that previously prevented path traversal in resource file output paths. An attacker can embed `../` sequences in the `resources.arsc` Type String Pool to escape the output directory and write files to arbitrary locations, including `~/.ssh/config`, `~/.bashrc`, or Windows Startup folders, escalating to RCE. The fix in version 3.0.2 re-introduces `BrutIO.sanitizePath()` in `ResFileDecoder.java` before file write operations.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N","score":7.1},"cwes":["CWE-22"],"references":["https://github.com/iBotPeaches/Apktool/commit/e10a0450c7afcd9462c0b76bcbff0e7428b92bdd#diff-cd531ebe1014bfd18185bf21585ca5cdb16fbcb07703ebc47949a1b4e4e36bc3","https://github.com/iBotPeaches/Apktool/pull/4041","https://github.com/iBotPeaches/Apktool/releases/tag/v3.0.2","https://github.com/iBotPeaches/Apktool/security/advisories/GHSA-m8mh-x359-vm8m"],"products":["apktool:apktool"],"source":"nvd","synced_at":"2026-10-26T22:26:44.656832877+00:00"},"epss":{"cve":"CVE-2026-39973","score":0.00182,"percentile":0.07725,"date":"2026-10-26"},"kev":null,"osv":[{"id":"GHSA-m8mh-x359-vm8m","url":"https://osv.dev/vulnerability/GHSA-m8mh-x359-vm8m","summary":"Apktool: Path Traversal to Arbitrary File Write","modified":"2026-04-23T21:41:29.553559Z","packages":[{"ecosystem":"Maven","name":"org.apktool:apktool-lib","purl":"pkg:maven/org.apktool/apktool-lib","ranges":[">=3.0.0 <3.0.2"],"fixed":["3.0.2"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}