CVE-2026-53598 json
Prompty: Arbitrary File Read via ${file:path} Reference Expansion
published 2026-07-16 3 mo ago modified 2026-10-24 15 d ago also GHSA-wxhm-2mq7-7697 , PYSEC-2026-3538 , EUVD-2026-44940
- cvss
- 7.5
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 1.3%
- EPSS 1.3% chance of exploitation in 30 days, percentile 70%
- public exploits
- 0
- none known
Summary
Prompty is a markdown file format (.prompty) for LLM prompts. Prior to 2.0.0-beta.2, Prompty loaders expanded ${file:...} references in .prompty frontmatter without enforcing that resolved paths stayed within the prompt directory or allowed roots, allowing an attacker-controlled prompt file to read local files through absolute paths, .. traversal, or symlink escapes. This issue is fixed in versions 2.0.0-beta.2.
Patch / fix
- pypi prompty 2.0.0b2
- npm @prompty/core 2.0.0-beta.2
- crates.io prompty 2.0.0-beta.2
- nuget Prompty.Core 2.0.0-beta.2
CISA SSVC
- Exploitation
- none
- Automatable
- yes
- Technical impact
- partial
- Assessed
- 3 mo ago
Exploit prediction
1.29% chance of exploitation in the next 30 days, higher than 70% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N |
| GitHub | 3.1 | 7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N |
| OSV | 3.1 | 7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| pypi | prompty | <2.0.0b2 |
2.0.0b2 |
| npm | @prompty/core | <2.0.0-beta.2 |
2.0.0-beta.2 |
| crates.io | prompty | <2.0.0-beta.2 |
2.0.0-beta.2 |
| nuget | Prompty.Core | <2.0.0-beta.2 |
2.0.0-beta.2 |
Affected products
- microsoft prompty
Classification
References
-
github.com
/microsoft/prompty/commit/88ac9948d7d37995edbb2f6d36913436626c39e1
web
-
github.com
/microsoft/prompty/security/advisories/GHSA-wxhm-2mq7-7697
web
-
nvd.nist.gov
/vuln/detail/CVE-2026-53598
advisory
-
github.com
/microsoft/prompty
package
-
pypi.org
/project/prompty
package
-
github.com
/advisories/GHSA-wxhm-2mq7-7697
advisory
Sources
- CVE List CVE-2026-53598
- GitHub Advisory GHSA-wxhm-2mq7-7697
- NVD CVE-2026-53598
- OSV PYSEC-2026-3538
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.