CVE-2026-47078: Relative Path Traversal vulnerability in Erlang OTP (stdlib zip module) allows writing files outside the intended extraction directory via a crafted zip archive. zip:unzip/1,2 and

unknownCVE-2026-47078

Relative Path Traversal vulnerability in Erlang OTP (stdlib zip module) allows writing files outside the intended extraction directory via a crafted zip archive. zip:unzip/1,2 and zip:extract/1,2 validate entry paths using zip:check_dir_level/2, which tracks directory depth as a running integer counter: .. decrements it, normal path components increment it. The caller rejects only paths where the final counter value is less than zero. A path such as ../x/y causes the counter to go negative mid-traversal then recover to zero, passing validation while resolving to a location outside the extraction directory when joined with the current working directory via add_cwd. This vulnerability is associated with program file lib/stdlib/src/zip.erl. This issue affects OTP from OTP 27.1 before OTP 29.0.4, OTP 28.5.0.4 and OTP 27.3.4.15, corresponding to stdlib from 6.1 before 8.0.3, 7.3.0.1 and 6.2.2.4.

Details

Source: NVD Recent CVEs (US · database · site)
Severity: unknown
Published: 2026-07-27
Last updated: 2026-07-30
Exploitation: Not in CISA KEV at last sync

Original advisory: https://nvd.nist.gov/vuln/detail/CVE-2026-47078

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Low exploitation riskCVE-2026-470780.15% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 5% of all scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2026-47078	coverage & exploitation status	NVD · CVE.org

Same CVEs, other sources

How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.

high[NEW] [high] Erlang/OTP: Multiple vulnerabilitiescert-bund

Recent advisories for Relative Path Traversal

A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.

unknownCVE-2026-66755: Relative Path Traversal in the ISA-Tab parser in Apache Software Foundation Apache Tika from 1…nvd · 2026-07-30
mediumCVE-2026-18192: VIN-DS783E-E6 developed by Vacron has an Arbitrary File Read vulnerability, allowing authentic…nvd · 2026-07-29
mediumGHSA-49h3-cwhj-4737: Cloudreve: Path Traversal in WOPI PUT_RELATIVE Allows Arbitrary File Creation in Owner Ac…ghsa · 2026-07-24
criticalCVE-2026-12701: A path traversal vulnerability was found in pulpcore. The relative_path_validator function onl…nvd · 2026-07-20
highCVE-2026-56196: Relative path traversal in Windows Admin Center allows an authorized attacker to execute code …nvd · 2026-07-14
highCVE-2026-50454: Relative path traversal in Windows User Interface Core allows an authorized attacker to elevat…nvd · 2026-07-14