CVE-2026-39861 | Anthropic claude-code up to 2.1.63 Symlink path traversal (GHSA-vp62-r36r-9xqp)

VDB-358399 · CVE-2026-39861 · GHSA-vp62-r36r-9xqp Anthropic claude-code up to 2.1.63 Symlink path traversal History Diff relate json xml CTI CVSS Meta Temp Score CVSS is a standardized scoring system to determine possibilities of attacks. The Temp Score considers temporal factors like disclosure, exploit and countermeasures. The unique Meta Score calculates the average score of different sources to provide a normalized scoring system. Current Exploit Price (≈) Our analysts are monitoring exploit markets and are in contact with vulnerability brokers. The range indicates the observed or calculated exploit price to be seen on exploit markets. A good indicator to understand the monetary effort required for and the popularity of an attack. CTI Interest Score Our Cyber Threat Intelligence team is monitoring different web sites, mailing lists, exploit markets and social media networks. The CTI Interest Score identifies the interest of attackers and the security community for this specific vulnerability in real-time. A high score indicates an elevated risk to be targeted for this vulnerability. 7.0 $0-$5k 1.29+ Summary info A vulnerability classified as critical has been found in Anthropic claude-code up to 2.1.63 . This affects an unknown function of the component Symlink Handler . This manipulation causes path traversal. The identification of this vulnerability is CVE-2026-39861 . It is possible to initiate the attack remotely. There is no exploit available. It is recommended to upgrade the affected component. Details info A vulnerability classified as critical was found in Anthropic claude-code up to 2.1.63 . Affected by this vulnerability is some unknown processing of the component Symlink Handler . The manipulation with an unknown input leads to a path traversal vulnerability. The CWE definition for the vulnerability is CWE-22 . The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is: Claude Code is an agentic coding tool. Prior to version 2.1.64, Claude Code's sandbox did not prevent sandboxed processes from creating symlinks pointing to locations outside the workspace. When Claude Code subsequently wrote to a path within such a symlink, its unsandboxed process followed the symlink and wrote to the target location outside the workspace without prompting the user for confirmation. This allowed a sandbox escape where neither the sandboxed command nor the unsandboxed app could independently write outside the workspace, but their combination could write to arbitrary locations, potentially leading to code execution outside the sandbox. Reliably exploiting this required the ability to add untrusted content into a Claude Code context window to trigger sandboxed code execution via prompt injection. Users on standard Claude Code auto-update have received this fix automatically. Users performing manual updates are advised to update to version 2.1.64 or later. It is possible to read the advisory at github.com . This vulnerability is known as CVE-2026-39861 since 04/07/2026. The exploitation appears to be easy. The attack can be launched remotely. The exploitation doesn't need any form of authentication. The technical details are unknown and an exploit is not publicly available. The attack technique deployed by this issue is T1006 according to MITRE ATT&CK. Upgrading to version 2.1.64 eliminates this vulnerability. The entries VDB-147724 , VDB-157465 , VDB-171362 and VDB-173158 are related to this item. Product info Type Artificial Intelligence Software Vendor Anthropic Name claude-code Version 2.1.0 2.1.1 2.1.2 2.1.3 2.1.4 2.1.5 2.1.6 2.1.7 2.1.8 2.1.9 2.1.10 2.1.11 2.1.12 2.1.13 2.1.14 2.1.15 2.1.16 2.1.17 2.1.18 2.1.19 2.1.20 2.1.21 2.1.22 2.1.23 2.1.24 2.1.25 2.1.26 2.1.27 2.1.28 2.1.29 2.1.30 2.1.31 2.1.32 2.1.33 2.1.34 2.1.35 2.1.36 2.1.37 2.1.38 2.1.39 2.1.40 2.1.41 2.1.42 2.1.43 2.1.44 2.1.45 2.1.46 2.1.47 2.1.48 2.1.49 2.1.50 2.1.51 2.1.52 2.1.53 2.1.54 2.1.55 2.1.56 2.1.57 2.1.58 2.1.59 2.1.60 2.1.61 2.1.62 2.1.63 CPE 2.3 info 🔒 🔒 🔒 CPE 2.2 info 🔒 🔒 🔒 CVSSv4 info VulDB Vector : 🔒 VulDB Reliability : 🔍 CNA CVSS-B Score : 🔒 CNA CVSS-BT Score : 🔒 CNA Vector : 🔒 CVSSv3 info VulDB Meta Base Score : 7.3 VulDB Meta Temp Score : 7.0 VulDB Base Score : 7.3 VulDB Temp Score : 7.0 VulDB Vector : 🔒 VulDB Reliability : 🔍 CVSSv2 info AV AC Au C I A 💳 💳 💳 💳 💳 💳 💳 💳 💳 💳 💳 💳 💳 💳 💳 💳 💳 💳 Vector Complexity Authentication Confidentiality Integrity Availability Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock VulDB Base Score : 🔒 VulDB Temp Score : 🔒 VulDB Reliability : 🔍 Exploiting info Class : Path traversal CWE : CWE-22 CAPEC : 🔒 ATT&CK : 🔒 Physical : No Local : No Remote : Yes Availability : 🔒 Status : Not defined Price Prediction : 🔍 Current Price Estimation : 🔒 0-Day Unlock Unlock Unlock Unlock Today Unlock Unlock Unlock Unlock Threat Intelligence info Interest : 🔍 Active Actors : 🔍 Active APT Groups : 🔍 Countermeasures info Recommended : Upgrade Status : 🔍 0-Day Time : 🔒 Upgrade : claude-code 2.1.64 Timeline info 04/07/2026 CVE reserved 04/21/2026 +14 days Advisory disclosed 04/21/2026 +0 days VulDB entry created 04/21/2026 +0 days VulDB entry last update Sources info Advisory : GHSA-vp62-r36r-9xqp Status : Confirmed CVE : CVE-2026-39861 ( 🔒 ) GCVE (CVE) : GCVE-0-2026-39861 GCVE (VulDB) : GCVE-100-358399 See also : 🔒 Entry info Created : 04/21/2026 07:15 AM Changes : 04/21/2026 07:15 AM (69) Complete : 🔍 Cache ID : 99:125:101 Discussion No comments yet. Languages: en. Please log in to comment. ◂ Previous Overview Next ▸ Want to know what is going to be exploited? We predict KEV entries!