Vulnerability · Published Oct 30, 2026 · Assigned by GitHub_M
CVE-2026-62331praktor: Telegram upload traversal permits persistent agent instruction injection
High 8.2
In plain English
A high-severity path traversal in praktor from mtzanidakis. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.8% (higher than 56% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official description
praktor is a multi-agent Claude Code orchestrator with Telegram input and output, Docker isolation, and a Mission Control UI. Prior to 0.9.1, both Telegram upload sites in `internal/telegram/bot.go` concatenate the attacker-controlled document filename into a destination path without sanitization, and `path.Join` collapses parent-directory traversal. A remote Telegram user who can message the bot can therefore write outside `uploads/` within the persistent agent workspace mounted at `/workspace/agent`. Because `allow_from: []` permits all senders by default, no prior authentication or privilege is required in that configuration. The attacker can plant or overwrite `CLAUDE.md`, instruction, skill, hook, or configuration files that the Claude agent reads and operates on across later runs, turning a document upload into stored instruction injection. The demonstrated arbitrary-write scope is the persistent agent workspace volume, not an unrestricted host-filesystem write. This issue is fixed in version 0.9.1.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Go | github.com/mtzanidakis/praktor | 0.9.1 | GHSA-48v2-6jcm-fc99 |
| Go | github.com/mtzanidakis/praktor | 0.9.1 | GO-2026-6908 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| mtzanidakis | praktor | < 0.9.1 |
Weakness: CWE-22 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:N
References
- https://github.com/mtzanidakis/praktor/security/advisories/GHSA-48v2-6jcm-fc99 x_refsource_CONFIRM
- https://github.com/mtzanidakis/praktor/pull/228 x_refsource_MISC
- https://github.com/mtzanidakis/praktor/commit/c3731eeda01c0b3ec1dbd13cccd5a147c3182141 x_refsource_MISC
- https://github.com/mtzanidakis/praktor/releases/tag/v0.9.1 x_refsource_MISC