# CVE-2021-36770: libperl5.38t64: Encode.pm, as distributed in Perl through 5.34.0, allows local users togain privileges via a Trojan horse Encode::Con...

CVE-2021-36770 is fixed in 7 products on 1 platform, first by libperl5.32 5.32.1-3ubuntu3, released August 8, 2021. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2021-36770
- Priority: Routine
- CVSS: n/a (Medium)
- EPSS: 0.0139
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Aug 8, 2021

## Description

Encode.pm, as distributed in Perl through 5.34.0, allows local users togain privileges via a Trojan horse Encode::ConfigLocal library (in thecurrent working directory) that preempts dynamic module loading.Exploitation requires an unusual configuration, and certain 2021 versionsof Encode.pm (3.05 through 3.11). This issue occurs because the || operatorevaluates @INC in a scalar context, and thus @INC has only an integervalue.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | libperl5.32 Ubuntu 22.04.1 LTS (jammy) | 5.32.1-3ubuntu3 | [libperl5.32 5.32.1-3ubuntu3](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-libperl5.32-5.32.1-3ubuntu3.md) | Aug 8, 2021 |
| Linux | libperl5.38t64 Ubuntu 24.10 (oracular) | 5.32.1-3ubuntu3 | [libperl5.38t64 5.32.1-3ubuntu3](https://patchblox.com/security/data/fix/linux/ubuntu-oracular-libperl5.38t64-5.32.1-3ubuntu3.md) | Jan 16, 2026 |
| Linux | libperl5.38t64 Ubuntu 25.04 (plucky) | 5.32.1-3ubuntu3 | [libperl5.38t64 5.32.1-3ubuntu3](https://patchblox.com/security/data/fix/linux/ubuntu-plucky-libperl5.38t64-5.32.1-3ubuntu3.md) | Jan 16, 2026 |
| Linux | perl Ubuntu 22.04.1 LTS (jammy) | 5.32.1-3ubuntu3 | [perl 5.32.1-3ubuntu3](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-perl-5.32.1-3ubuntu3.md) | Aug 8, 2021 |
| Linux | perl Ubuntu 24.10 (oracular) | 5.32.1-3ubuntu3 | [perl 5.32.1-3ubuntu3](https://patchblox.com/security/data/fix/linux/ubuntu-oracular-perl-5.32.1-3ubuntu3.md) | Jan 16, 2026 |
| Linux | perl Ubuntu 25.04 (plucky) | 5.32.1-3ubuntu3 | [perl 5.32.1-3ubuntu3](https://patchblox.com/security/data/fix/linux/ubuntu-plucky-perl-5.32.1-3ubuntu3.md) | Jan 16, 2026 |
| Linux | perl-base Ubuntu 22.04.1 LTS (jammy) | 5.32.1-3ubuntu3 | [perl-base 5.32.1-3ubuntu3](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-perl-base-5.32.1-3ubuntu3.md) | Aug 8, 2021 |
| Linux | perl-base Ubuntu 24.10 (oracular) | 5.32.1-3ubuntu3 | [perl-base 5.32.1-3ubuntu3](https://patchblox.com/security/data/fix/linux/ubuntu-oracular-perl-base-5.32.1-3ubuntu3.md) | Jan 16, 2026 |
| Linux | perl-base Ubuntu 25.04 (plucky) | 5.32.1-3ubuntu3 | [perl-base 5.32.1-3ubuntu3](https://patchblox.com/security/data/fix/linux/ubuntu-plucky-perl-base-5.32.1-3ubuntu3.md) | Jan 16, 2026 |
| Linux | perl-debug Ubuntu 22.04.1 LTS (jammy) | 5.32.1-3ubuntu3 | [perl-debug 5.32.1-3ubuntu3](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-perl-debug-5.32.1-3ubuntu3.md) | Aug 8, 2021 |
| Linux | perl-debug Ubuntu 24.10 (oracular) | 5.32.1-3ubuntu3 | [perl-debug 5.32.1-3ubuntu3](https://patchblox.com/security/data/fix/linux/ubuntu-oracular-perl-debug-5.32.1-3ubuntu3.md) | Jan 16, 2026 |
| Linux | perl-debug Ubuntu 25.04 (plucky) | 5.32.1-3ubuntu3 | [perl-debug 5.32.1-3ubuntu3](https://patchblox.com/security/data/fix/linux/ubuntu-plucky-perl-debug-5.32.1-3ubuntu3.md) | Jan 16, 2026 |
| Linux | perl-modules-5.32 Ubuntu 22.04.1 LTS (jammy) | 5.32.1-3ubuntu3 | [perl-modules-5.32 5.32.1-3ubuntu3](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-perl-modules-5.32-5.32.1-3ubuntu3.md) | Aug 8, 2021 |
| Linux | perl-modules-5.38 Ubuntu 24.10 (oracular) | 5.32.1-3ubuntu3 | [perl-modules-5.38 5.32.1-3ubuntu3](https://patchblox.com/security/data/fix/linux/ubuntu-oracular-perl-modules-5.38-5.32.1-3ubuntu3.md) | Jan 16, 2026 |
| Linux | perl-modules-5.38 Ubuntu 25.04 (plucky) | 5.32.1-3ubuntu3 | [perl-modules-5.38 5.32.1-3ubuntu3](https://patchblox.com/security/data/fix/linux/ubuntu-plucky-perl-modules-5.38-5.32.1-3ubuntu3.md) | Jan 16, 2026 |

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