CVE catalog

CVE-2021-36770

perl: CVE-2021-36770

Severity: Medium
Published: Aug 9, 2021, 10:00:00 PM UTC
Source: [NVD] · [CVE record]
EPSS: 1.39% · Oct 25, 2026

Encode.pm, as distributed in Perl through 5.34.0, allows local users to gain privileges via a Trojan horse Encode::ConfigLocal library (in the current working directory) that preempts dynamic module loading. Exploitation requires an unusual configuration, and certain 2021 versions of Encode.pm (3.05 through 3.11). This issue occurs because the || operator evaluates @INC in a scalar context, and thus @INC has only an integer value.

Vulnerable and fixed packages

Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.

Distribution	Package	Release	Version	Status
Debian	perl	sid	`5.42.3-1`	fixed
Debian	perl	forky	`5.42.3-1`	fixed
Debian	perl	trixie	`5.40.1-6+deb13u1`	fixed
Debian	perl	bookworm	`5.36.0-7+deb12u3`	fixed
Debian	perl	bookworm-security	`5.36.0-7+deb12u4`	fixed
Debian	libencode-perl	sid	`3.24-1`	fixed
Debian	libencode-perl	forky	`3.24-1`	fixed
Debian	libencode-perl	trixie	`3.21-1`	fixed
Debian	libencode-perl	bookworm	`3.19-1`	fixed
Alpine	perl	3.15	`5.34.0-r1`	fixed
Alpine	perl	3.16	`5.34.0-r1`	fixed
Alpine	perl	3.17	`5.34.0-r1`	fixed
Alpine	perl	3.18	`5.34.0-r1`	fixed
Alpine	perl	3.19	`5.34.0-r1`	fixed
Alpine	perl	3.20	`5.34.0-r1`	fixed
Alpine	perl	3.21	`5.34.0-r1`	fixed
Alpine	perl	3.22	`5.34.0-r1`	fixed
Alpine	perl	3.23	`5.34.0-r1`	fixed
Alpine	perl	3.24	`5.34.0-r1`	fixed
Alpine	perl-encode	3.15	`3.12-r0`	fixed
Alpine	perl-encode	3.16	`3.12-r0`	fixed
Alpine	perl-encode	3.17	`3.12-r0`	fixed
Alpine	perl-encode	3.18	`3.12-r0`	fixed
Alpine	perl-encode	3.19	`3.12-r0`	fixed
Alpine	perl-encode	3.20	`3.12-r0`	fixed
Alpine	perl-encode	3.21	`3.12-r0`	fixed
Alpine	perl-encode	3.22	`3.12-r0`	fixed
Alpine	perl-encode	3.23	`3.12-r0`	fixed
Alpine	perl-encode	3.24	`3.12-r0`	fixed

Fixed-version evidence

Distribution	Package	Type	Release	Fixed version	Urgency	Origin	Bugs
Debian	perl	source	sid	`5.32.1-5`	not yet assigned	Not reported	Not reported
Debian	perl	source	forky	`5.32.1-5`	not yet assigned	Not reported	Not reported
Debian	perl	source	trixie	`5.32.1-5`	not yet assigned	Not reported	Not reported
Debian	perl	source	bookworm	`5.32.1-5`	not yet assigned	Not reported	Not reported
Debian	libencode-perl	source	sid	`3.08-2`	not yet assigned	Not reported	Not reported
Debian	libencode-perl	source	forky	`3.08-2`	not yet assigned	Not reported	Not reported
Debian	libencode-perl	source	trixie	`3.08-2`	not yet assigned	Not reported	Not reported
Debian	libencode-perl	source	bookworm	`3.08-2`	not yet assigned	Not reported	Not reported
Alpine	perl	apk	3.15	`5.34.0-r1`	Not reported	ALPINE-CVE-2021-36770	Not reported
Alpine	perl	apk	3.16	`5.34.0-r1`	Not reported	ALPINE-CVE-2021-36770	Not reported
Alpine	perl	apk	3.17	`5.34.0-r1`	Not reported	ALPINE-CVE-2021-36770	Not reported
Alpine	perl	apk	3.18	`5.34.0-r1`	Not reported	ALPINE-CVE-2021-36770	Not reported
Alpine	perl	apk	3.19	`5.34.0-r1`	Not reported	ALPINE-CVE-2021-36770	Not reported
Alpine	perl	apk	3.20	`5.34.0-r1`	Not reported	ALPINE-CVE-2021-36770	Not reported
Alpine	perl	apk	3.21	`5.34.0-r1`	Not reported	ALPINE-CVE-2021-36770	Not reported
Alpine	perl	apk	3.22	`5.34.0-r1`	Not reported	ALPINE-CVE-2021-36770	Not reported
Alpine	perl	apk	3.23	`5.34.0-r1`	Not reported	ALPINE-CVE-2021-36770	Not reported
Alpine	perl	apk	3.24	`5.34.0-r1`	Not reported	ALPINE-CVE-2021-36770	Not reported
Alpine	perl-encode	apk	3.15	`3.12-r0`	Not reported	ALPINE-CVE-2021-36770	Not reported
Alpine	perl-encode	apk	3.16	`3.12-r0`	Not reported	ALPINE-CVE-2021-36770	Not reported
Alpine	perl-encode	apk	3.17	`3.12-r0`	Not reported	ALPINE-CVE-2021-36770	Not reported
Alpine	perl-encode	apk	3.18	`3.12-r0`	Not reported	ALPINE-CVE-2021-36770	Not reported
Alpine	perl-encode	apk	3.19	`3.12-r0`	Not reported	ALPINE-CVE-2021-36770	Not reported
Alpine	perl-encode	apk	3.20	`3.12-r0`	Not reported	ALPINE-CVE-2021-36770	Not reported
Alpine	perl-encode	apk	3.21	`3.12-r0`	Not reported	ALPINE-CVE-2021-36770	Not reported
Alpine	perl-encode	apk	3.22	`3.12-r0`	Not reported	ALPINE-CVE-2021-36770	Not reported
Alpine	perl-encode	apk	3.23	`3.12-r0`	Not reported	ALPINE-CVE-2021-36770	Not reported
Alpine	perl-encode	apk	3.24	`3.12-r0`	Not reported	ALPINE-CVE-2021-36770	Not reported

OpenFactory catalog packages

[Debian 12 (Bookworm)]

[libencode-perl]Fixed
Source package: [libencode-perl]
Details (2)
- 3.19-1+b1 · amd64 · bookworm
  Fixed · Fixed: 3.08-2
  dsa · libencode-perl · debian · bookworm; dsa · libencode-perl · debian · 12
- 3.19-1+b1 · arm64 · bookworm
  Fixed · Fixed: 3.08-2
  dsa · libencode-perl · debian · bookworm; dsa · libencode-perl · debian · 12
[libperl5.36]Fixed
Source package: [perl]
Details (4)
- 5.36.0-7+deb12u3 · amd64 · bookworm
  Fixed · Fixed: 5.32.1-5
  dsa · perl · debian · bookworm; dsa · perl · debian · 12
- 5.36.0-7+deb12u3 · arm64 · bookworm
  Fixed · Fixed: 5.32.1-5
  dsa · perl · debian · bookworm; dsa · perl · debian · 12
- 5.36.0-7+deb12u2 · amd64 · bookworm-security
  Fixed · Fixed: 5.32.1-5
  dsa · perl · debian · bookworm; dsa · perl · debian · 12
- 5.36.0-7+deb12u2 · arm64 · bookworm-security
  Fixed · Fixed: 5.32.1-5
  dsa · perl · debian · bookworm; dsa · perl · debian · 12
[libperl-dev]Fixed
Source package: [perl]
Details (4)
- 5.36.0-7+deb12u3 · amd64 · bookworm
  Fixed · Fixed: 5.32.1-5
  dsa · perl · debian · bookworm; dsa · perl · debian · 12
- 5.36.0-7+deb12u3 · arm64 · bookworm
  Fixed · Fixed: 5.32.1-5
  dsa · perl · debian · bookworm; dsa · perl · debian · 12
- 5.36.0-7+deb12u2 · amd64 · bookworm-security
  Fixed · Fixed: 5.32.1-5
  dsa · perl · debian · bookworm; dsa · perl · debian · 12
- 5.36.0-7+deb12u2 · arm64 · bookworm-security
  Fixed · Fixed: 5.32.1-5
  dsa · perl · debian · bookworm; dsa · perl · debian · 12
[perl]Fixed
Details (4)
- 5.36.0-7+deb12u3 · amd64 · bookworm
  Fixed · Fixed: 5.32.1-5
  dsa · perl · debian · bookworm; dsa · perl · debian · 12
- 5.36.0-7+deb12u3 · arm64 · bookworm
  Fixed · Fixed: 5.32.1-5
  dsa · perl · debian · bookworm; dsa · perl · debian · 12
- 5.36.0-7+deb12u2 · amd64 · bookworm-security
  Fixed · Fixed: 5.32.1-5
  dsa · perl · debian · bookworm; dsa · perl · debian · 12
- 5.36.0-7+deb12u2 · arm64 · bookworm-security
  Fixed · Fixed: 5.32.1-5
  dsa · perl · debian · bookworm; dsa · perl · debian · 12
[perl-base]Fixed
Source package: [perl]
Details (4)
- 5.36.0-7+deb12u3 · amd64 · bookworm
  Fixed · Fixed: 5.32.1-5
  dsa · perl · debian · bookworm; dsa · perl · debian · 12
- 5.36.0-7+deb12u3 · arm64 · bookworm
  Fixed · Fixed: 5.32.1-5
  dsa · perl · debian · bookworm; dsa · perl · debian · 12
- 5.36.0-7+deb12u2 · amd64 · bookworm-security
  Fixed · Fixed: 5.32.1-5
  dsa · perl · debian · bookworm; dsa · perl · debian · 12
- 5.36.0-7+deb12u2 · arm64 · bookworm-security
  Fixed · Fixed: 5.32.1-5
  dsa · perl · debian · bookworm; dsa · perl · debian · 12
[perl-debug]Fixed
Source package: [perl]
Details (4)
- 5.36.0-7+deb12u3 · amd64 · bookworm
  Fixed · Fixed: 5.32.1-5
  dsa · perl · debian · bookworm; dsa · perl · debian · 12
- 5.36.0-7+deb12u3 · arm64 · bookworm
  Fixed · Fixed: 5.32.1-5
  dsa · perl · debian · bookworm; dsa · perl · debian · 12
- 5.36.0-7+deb12u2 · amd64 · bookworm-security
  Fixed · Fixed: 5.32.1-5
  dsa · perl · debian · bookworm; dsa · perl · debian · 12
- 5.36.0-7+deb12u2 · arm64 · bookworm-security
  Fixed · Fixed: 5.32.1-5
  dsa · perl · debian · bookworm; dsa · perl · debian · 12
[perl-doc]Fixed
Source package: [perl]
Details (4)
- 5.36.0-7+deb12u3 · all · bookworm
  Fixed · Fixed: 5.32.1-5
  dsa · perl · debian · bookworm; dsa · perl · debian · 12
- 5.36.0-7+deb12u3 · all · bookworm
  Fixed · Fixed: 5.32.1-5
  dsa · perl · debian · bookworm; dsa · perl · debian · 12
- 5.36.0-7+deb12u2 · all · bookworm-security
  Fixed · Fixed: 5.32.1-5
  dsa · perl · debian · bookworm; dsa · perl · debian · 12
- 5.36.0-7+deb12u2 · all · bookworm-security
  Fixed · Fixed: 5.32.1-5
  dsa · perl · debian · bookworm; dsa · perl · debian · 12
[perl-modules-5.36]Fixed
Source package: [perl]
Details (4)
- 5.36.0-7+deb12u3 · all · bookworm
  Fixed · Fixed: 5.32.1-5
  dsa · perl · debian · bookworm; dsa · perl · debian · 12
- 5.36.0-7+deb12u3 · all · bookworm
  Fixed · Fixed: 5.32.1-5
  dsa · perl · debian · bookworm; dsa · perl · debian · 12
- 5.36.0-7+deb12u2 · all · bookworm-security
  Fixed · Fixed: 5.32.1-5
  dsa · perl · debian · bookworm; dsa · perl · debian · 12
- 5.36.0-7+deb12u2 · all · bookworm-security
  Fixed · Fixed: 5.32.1-5
  dsa · perl · debian · bookworm; dsa · perl · debian · 12

[Debian 13 (Trixie)]

[libencode-perl]Fixed
Source package: [libencode-perl]
Details (2)
- 3.21-1+b2 · amd64 · trixie
  Fixed · Fixed: 3.08-2
  dsa · libencode-perl · debian · 13
- 3.21-1+b2 · arm64 · trixie
  Fixed · Fixed: 3.08-2
  dsa · libencode-perl · debian · 13
[libperl5.40]Fixed
Source package: [perl]
Details (2)
- 5.40.1-6 · amd64 · trixie
  Fixed · Fixed: 5.32.1-5
  dsa · perl · debian · 13
- 5.40.1-6 · arm64 · trixie
  Fixed · Fixed: 5.32.1-5
  dsa · perl · debian · 13
[libperl-dev]Fixed
Source package: [perl]
Details (2)
- 5.40.1-6 · amd64 · trixie
  Fixed · Fixed: 5.32.1-5
  dsa · perl · debian · 13
- 5.40.1-6 · arm64 · trixie
  Fixed · Fixed: 5.32.1-5
  dsa · perl · debian · 13
[perl]Fixed
Details (2)
- 5.40.1-6 · amd64 · trixie
  Fixed · Fixed: 5.32.1-5
  dsa · perl · debian · 13
- 5.40.1-6 · arm64 · trixie
  Fixed · Fixed: 5.32.1-5
  dsa · perl · debian · 13
[perl-base]Fixed
Source package: [perl]
Details (2)
- 5.40.1-6 · amd64 · trixie
  Fixed · Fixed: 5.32.1-5
  dsa · perl · debian · 13
- 5.40.1-6 · arm64 · trixie
  Fixed · Fixed: 5.32.1-5
  dsa · perl · debian · 13
[perl-debug]Fixed
Source package: [perl]
Details (2)
- 5.40.1-6 · amd64 · trixie
  Fixed · Fixed: 5.32.1-5
  dsa · perl · debian · 13
- 5.40.1-6 · arm64 · trixie
  Fixed · Fixed: 5.32.1-5
  dsa · perl · debian · 13
[perl-doc]Fixed
Source package: [perl]
Details (2)
- 5.40.1-6 · all · trixie
  Fixed · Fixed: 5.32.1-5
  dsa · perl · debian · 13
- 5.40.1-6 · all · trixie
  Fixed · Fixed: 5.32.1-5
  dsa · perl · debian · 13
[perl-modules-5.40]Fixed
Source package: [perl]
Details (2)
- 5.40.1-6 · all · trixie
  Fixed · Fixed: 5.32.1-5
  dsa · perl · debian · 13
- 5.40.1-6 · all · trixie
  Fixed · Fixed: 5.32.1-5
  dsa · perl · debian · 13

Observed: Oct 23, 2026, 5:58:56 PM UTC

References

[CERT-Bund public advisories] · [Debian Security Tracker] · [FIRST EPSS] · [OSV Package Vulnerability Database] · [SUSE security advisories and VEX]