VIR Vulnerability Intelligence Relay

CVE-2021-40839

low
Published 2021-09-13 · Modified 2025-10-09
💬 Discuss on Community ✚ Propose mitigation
CVSS v3
—
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CVSS v4 NEW
—
not yet in upstream
VIR risk
2.5

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.

Predictions

Exploit likelihood
30%
Patch ETA
—

Heuristic predictions, AS-IS, for prioritization only.

Mitigations

No mitigations published for this CVE yet.

The vendor-content worker queues fetches as references arrive (check back in a few minutes). Or — if you've already worked around this in production — publish your fix to the community-verified tier.

✚ Propose a mitigation on Community → Mitigations published via the community go through AI scoring + 2 human reviewers + 7-day silent objection window before landing here with source_tier=community-verified.

OS impact
arch Arch Affected 1 release
VersionStatusFixed in
— Affected —
debian Debian Mixed 5 releases
VersionStatusFixed in
trixie Fixed 1.0.6-2
sid Fixed 1.0.6-2
forky Fixed 1.0.6-2
bullseye Affected —
bookworm Fixed 1.0.6-2

Package impact
EcosystemPackageVulnerableFixed
python PyPIrencode<=1.0.6
python PyPIrencode<572ff74586d9b1daab904c6f7f7009ce0143bb75572ff74586d9b1daab904c6f7f7009ce0143bb75

References

Community-verified mitigations for this CVE will appear above when contributors publish them.

Verify integrity in audit chain (admin only). AS-IS.