CVE-2021-40839
HIGH7.5EPSS 17.3%Infinite Loop in rencode
Published: 9/13/2021Modified: 4/28/2026
Description
The rencode package through 1.0.6 for Python allows an infinite loop in typecode decoding (such as via ;\x2f\x7f), enabling a remote attack that consumes CPU and memory.
Affected packages (3)
- Debian/python-rencodefrom 0
- PyPI/rencodefrom 0, <= 1.0.6
- PyPI/rencodefrom 0, < 572ff74586d9b1daab904c6f7f7009ce0143bb75 | from 0
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 4.0 | — | CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N |
| osv | CVSS 3.1 | HIGH7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
References (12)
- ADVISORYhttps://github.com/advisories/GHSA-gh8j-2pgf-x458
- ADVISORYhttps://nvd.nist.gov/vuln/detail/CVE-2021-40839
- ADVISORYhttps://security-tracker.debian.org/tracker/CVE-2021-40839
- PATCHhttps://github.com/aresch/rencode
- WEBhttps://github.com/aresch/rencode/commit/572ff74586d9b1daab904c6f7f7009ce0143bb75
- WEBhttps://github.com/aresch/rencode/pull/29
- WEBhttps://github.com/pypa/advisory-database/tree/main/vulns/rencode/PYSEC-2021-345.yaml
- WEBhttps://lists.fedoraproject.org/archives/list/[email protected]/message/BMVQRPDVSVZNGGX57CFKCYT3DEYO4QB6
- WEBhttps://lists.fedoraproject.org/archives/list/[email protected]/message/MCLETLGVM5DBX6QNHQFW6TWGO5T3DENY
- WEBhttps://pypi.org/project/rencode/#history
- WEBhttps://seclists.org/fulldisclosure/2021/Sep/16
- WEBhttps://security.netapp.com/advisory/ntap-20211008-0001