CVE-2021-40839
HIGH
7.5
CVSS Score
Published: September 10, 2021 at 01:03 AM UTC
Updated: June 17, 2026 at 04:07 AM UTC
2 products affected across 2 vendorsFedoraRencode
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Severity
HIGH7.5
Exploit prediction
EPSS 6%
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
Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.
95%
v ≤ 1.0.6
Remediation
No guide yetNo remediation guidance has been written for this CVE yet. What the record does show:
Patch and advisory references
- https://github.com/aresch/rencode/commit/572ff74586d9b1daab904c6f7f7009ce0143bb75
- https://github.com/aresch/rencode/pull/29
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/BMVQRPDVSVZNGGX57CFKCYT3DEYO4QB6/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/MCLETLGVM5DBX6QNHQFW6TWGO5T3DENY/
References (7)
x_refsource_MISCPatchThird Party Advisory
Source: [email protected]
https://github.com/aresch/rencode/commit/572ff74586d9b1daab904c6f7f7009ce0143bb75x_refsource_MISCPatchThird Party Advisory
Source: [email protected]
https://github.com/aresch/rencode/pull/29Vendor Advisoryx_refsource_FEDORA
Source: [email protected]
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/BMVQRPDVSVZNGGX57CFKCYT3DEYO4QB6/Vendor Advisoryx_refsource_FEDORA
Source: [email protected]
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/MCLETLGVM5DBX6QNHQFW6TWGO5T3DENY/x_refsource_MISCThird Party Advisory
Source: [email protected]
https://pypi.org/project/rencode/#historyx_refsource_MISCMailing ListThird Party Advisory
Source: [email protected]
https://seclists.org/fulldisclosure/2021/Sep/16x_refsource_CONFIRMThird Party Advisory
Source: [email protected]
https://security.netapp.com/advisory/ntap-20211008-0001/CVSS
- Attack Vector
- NETWORK
- Complexity
- LOW
- Privileges
- NONE
- User Interaction
- NONE
- Scope
- UNCHANGED
- Confidentiality
- NONE
- Integrity
- NONE
- Availability
- HIGH
Vector?
Quick Info
StatusMODIFIED
CWE
CWE-835
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