CVE-2026-85731

8.8 HIGHpublic exploit available

Published 2026-09-16 · Updated 2026-09-16

AI risk analysis

Summary: The flaw allows a malicious archive to create a symlink chain that can overwrite any file writable by the process, potentially leading to code execution.
Exploitability: Exploitation requires a maliciously crafted archive and the ability to pull the artifact. The attacker must have the capability to control the artifact being pulled.
Blast radius: If exploited, this can lead to code execution and overwrite any file writable by the process, with potentially severe consequences.
Detection: No reliable host or network indicator is derivable from the published description.
Prioritized remediation: Upgrade to version 2.6.2 or later.

rcefile-overwritesymlink

Analysis generated locally by qwen2.5:7b-instruct (no data left the box). AI-assisted — verify against primary sources before acting.

NVD description

oras-go is a Go library for managing OCI artifacts. Prior to 2.6.2, content/file.Store extraction of OCI layers marked with io.deis.oras.content.unpack=true can write outside the store working directory. The pushDir path through extractTarDirectory and ensureLinkPath validates symlink targets lexically, resolveRelToBase skips its parent-symlink walk for root-level entries, and writeFile follows a terminal symlink when opening a regular file. A malicious archive can therefore create a symlink chain whose lexical target remains inside the extraction root but whose resolved target is an attacker-selected absolute path, then overwrite that target with a same-named regular-file entry even when AllowPathTraversalOnWrite is false. Pulling an attacker-controlled artifact can create or overwrite any file writable by the process and may lead to code execution. This issue is fixed in version 2.6.2.

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Weaknesses

CWE-22, CWE-59

Public exploit & PoC references

References

Data: NVD (public domain). Analysis: local $0 model. Defensive use only.