Claude Code is an agentic coding tool. From 2.1.59 until 2.1.128, the Claude Code /copy command wrote responses to a hardcoded, predictable path (/tmp/claude/response.md) without UID isolation, randomness, or symlink protection. The file w…
Exact source revision recorded 5 Nov 2026 10:02:47 UTC. It does not establish the source's current position. Latest evidence.
euvd · EUVD-2026-40116
PublishedClaude Code is an agentic coding tool. From 2.1.59 until 2.1.128, the Claude Code /copy command wrote responses to a hardcoded, predictable path (/tmp/claude/response.md) without UID isolation, randomness, or symlink protection. The file was created world-readable (0644) in a world-traversable directory (0755), allowing any local user to read a privileged user's Claude response, which could contain secrets or credentials. Additionally, because the path was static and predictable, a local attacker could pre-create the directory and plant a symlink at the expected file path, causing the privileged process to follow the symlink and overwrite an attacker-chosen file with the response text. Exploiting this required a local unprivileged user on the same system and a privileged user to run the /copy command. This vulnerability is fixed in 2.1.128.
EUVD source date text has no stated timezone and is retained without inventing a UTC instant. Related bulletin membership is not an alias, common cause or applicability claim. A missing vector with a zero score is treated as unrated. Complete vendor/product and underlying source evidence remains in the original JSON.
Original publisher date fields
datePublished: Jun 29, 2026, 2:03:14 PM
dateUpdated: Jun 29, 2026, 3:26:11 PM
- Source published
- Jun 29, 2026, 2:03:14 PM (timezone not stated)
- Source modified
- Jun 29, 2026, 3:26:11 PM (timezone not stated)
- Observed here
- 5 Nov 2026 10:02:47 UTC
- Source terms
- ENISA EUVD · source terms and attribution apply
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EUVD CVSS 4.0 · 4.4 CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:A/VC:L/VI:L/VA:H/SC:N/SI:N/SA:N