# CVE-2026-41565: libcryptx-perl: CryptX versions before 0.088_001 for Perl have a stack buffer overflow in four AEAD decrypt_verify helpers

CVE-2026-41565 is fixed in 5 products on 1 platform, first by FEDORA-2026-2EF4C0C642, released May 29, 2026. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2026-41565
- Priority: High
- CVSS: 7.5 (high)
- EPSS: 0.0047
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: May 28, 2026

## Description

CryptX versions before 0.088_001 for Perl have a stack buffer overflow in four AEAD decrypt_verify helpers.  The gcm_decrypt_verify, ccm_decrypt_verify, chacha20poly1305_decrypt_verify and eax_decrypt_verify XS routines copied the caller-supplied authentication tag into a fixed 144-byte stack buffer (MAXBLOCKSIZE) without checking the supplied length. A longer tag overwrites the stack past the buffer. Version 0.088 added the clamp to gcm_decrypt_verify, and 0.088_001 added it to the other three.  Any caller of an affected helper that forwards an attacker-controlled tag longer than the buffer can trigger the overflow.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | libcryptx-perl Debian 14 | 0.089-1 | [DEBIAN-CVE-2026-41565](https://patchblox.com/security/data/fix/linux/debian-cve-2026-41565.md) | Jun 24, 2026 |
| Linux | perl-CryptX Fedora 43 | 0.089-1.fc43 | [FEDORA-2026-2EF4C0C642](https://patchblox.com/security/data/fix/linux/fedora-2026-2ef4c0c642.md) | May 29, 2026 |
| Linux | perl-CryptX amzn 2023 | 0.088-2.amzn2023.0.3 | [ALAS2023-2026-1834](https://patchblox.com/security/data/fix/linux/alas2023-2026-1834.md) | Jun 11, 2026 |
| Linux | perl-CryptX opensuse-leap 16.0 | 0.89.0-bp160.1.1 | [OPENSUSE-SU-2026:20936-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-20936-1.md) | Jun 10, 2026 |
| Linux | perl-CryptX-debuginfo Fedora 43 | 0.089-1.fc43 | [FEDORA-2026-2EF4C0C642](https://patchblox.com/security/data/fix/linux/fedora-2026-2ef4c0c642.md) | May 29, 2026 |
| Linux | perl-CryptX-debuginfo amzn 2023 | 0.088-2.amzn2023.0.3 | [ALAS2023-2026-1834](https://patchblox.com/security/data/fix/linux/alas2023-2026-1834.md) | Jun 11, 2026 |
| Linux | perl-CryptX-debugsource Fedora 43 | 0.089-1.fc43 | [FEDORA-2026-2EF4C0C642](https://patchblox.com/security/data/fix/linux/fedora-2026-2ef4c0c642.md) | May 29, 2026 |
| Linux | perl-CryptX-debugsource amzn 2023 | 0.088-2.amzn2023.0.3 | [ALAS2023-2026-1834](https://patchblox.com/security/data/fix/linux/alas2023-2026-1834.md) | Jun 11, 2026 |
| Linux | perl-CryptX-tests Fedora 43 | 0.089-1.fc43 | [FEDORA-2026-2EF4C0C642](https://patchblox.com/security/data/fix/linux/fedora-2026-2ef4c0c642.md) | May 29, 2026 |
| Linux | perl-CryptX-tests amzn 2023 | 0.088-2.amzn2023.0.3 | [ALAS2023-2026-1834](https://patchblox.com/security/data/fix/linux/alas2023-2026-1834.md) | Jun 11, 2026 |

---

Data as of 2026-11-08T00:53:09Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

Free to use with attribution: show "Data: Patchblox Patch Radar" with a link to https://patchblox.com/security/patch-radar. Terms, including what needs a written agreement: https://patchblox.com/security/patch-radar/use-the-data

Product names, logos and trademarks shown on Patch Radar belong to their respective owners. They are used only to identify the software each security fix applies to and to help readers find their platform. Their use does not imply any affiliation with, or endorsement by, those owners, and Patchblox is not affiliated with any of them.