CVE-2021-26271

NameCVE-2021-26271
DescriptionIt was possible to execute a ReDoS-type attack inside CKEditor 4 before 4.16 by persuading a victim to paste crafted text into the Styles input of specific dialogs (in the Advanced Tab for Dialogs plugin).
SourceCVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)
Debian Bugs982587

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
ckeditor (PTS)bullseye4.16.0+dfsg-2fixed
bookworm4.19.1+dfsg-1fixed
sid, trixie4.22.1+dfsg1-2fixed
ckeditor3 (PTS)sid, trixie, bookworm, bullseye3.6.6.1+dfsg-7fixed

The information below is based on the following data on fixed versions.

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
ckeditorsource(unstable)4.16.0+dfsg-1982587
ckeditor3source(unstable)(not affected)

Notes

[buster] - ckeditor <no-dsa> (Minor issue)
[stretch] - ckeditor <postponed> (Fix along next DLA)
- ckeditor3 <not-affected> (dialogadvtab plugin introduced in ckeditor 4)
https://github.com/ckeditor/ckeditor4/blob/major/CHANGES.md#ckeditor-416

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