CVE-2021-23383

unknown

Published 2021-05-04 · Modified 2026-02-04

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CVSS v3

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CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS v4 NEW

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not yet in upstream

VIR risk

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Description

The package handlebars before 4.7.7 are vulnerable to Prototype Pollution when selecting certain compiling options to compile templates coming from an untrusted source.

Predictions

Exploit likelihood

30%

Patch ETA

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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

OS	Version	Status	Fixed in
debian	bookworm	fixed	`3:4.7.6+~4.1.0-2`
debian	bullseye	fixed	`3:4.7.6+~4.1.0-2`
debian	forky	fixed	`3:4.7.6+~4.1.0-2`
debian	sid	fixed	`3:4.7.6+~4.1.0-2`
debian	trixie	fixed	`3:4.7.6+~4.1.0-2`

Package impact

Ecosystem	Package	Vulnerable	Fixed
RubyGems	handlebars-source	`<>= 4.7.7`	`>= 4.7.7`
npm	handlebars	`<4.7.7`	`4.7.7`

References

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

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