Remote Memory Exposure in bl
A buffer over-read vulnerability exists in bl <4.0.3, <3.0.1, <2.2.1, and <1.2.3 which could allow an attacker to supply user input (even typed) that if it ends up in consume() argument and can become negative, the BufferList state can be corrupted, tricking it into exposing uninitialized memory via regular .slice() calls.
Affected software
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| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| npm package | bl | < 1.2.3, >= 2.0.0, < 2.2.1, >= 3.0.0, < 3.0.1, >= 4.0.0, < 4.0.3 | 1.2.3, 2.2.1, 3.0.1, 4.0.3 |
References
- https://nvd.nist.gov/vuln/detail/CVE-2020-8244
- https://github.com/rvagg/bl/commit/8a8c13c880e2bef519133ea43e0e9b78b5d0c91e
- https://github.com/rvagg/bl/commit/d3e240e3b8ba4048d3c76ef5fb9dd1f8872d3190
- https://github.com/rvagg/bl/commit/dacc4ac7d5fcd6201bcf26fbd886951be9537466
- https://hackerone.com/reports/966347
- https://lists.debian.org/debian-lts-announce/2021/06/msg00028.html
- CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:L- Weakness (CWE)
CWE-125, CWE-126- Platform
- npm
- Package
bl- Disclosed
- 02.09.2020
- Updated
- 11.10.2026 10:22
Sources and licenses
OSV / GitHub Advisory Database - GHSA-pp7h-53gx-mx7r - CC BY 4.0
Vulnerability history: bl
All published vulnerabilities of this package (npm package), newest first. Shows whether this is a one-off slip or a package that needs watching.
- Total entries
- 2
- First → latest
- 06.2019 09.2020
- Without a fix
- 0
- Exploited in attacks
- 0
Severity breakdown
- Medium 2
Disclosures per year
- 2019: 1
- 2020: 1
- 2021: 0
- 2022: 0
- 2023: 0
- 2024: 0
- 2025: 0
- 2026: 0
-
Remote Memory Exposure in bl this entry
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