# CVE-2025-49087: mbedtls: In Mbed TLS 3.6.1 through 3.6.3 before 3.6.4, a timing discrepancy in block cipher padding removal allows an attacker...

CVE-2025-49087 is fixed in mbedtls on 1 platform, first by DEBIAN-CVE-2025-49087, released July 20, 2025. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2025-49087
- Priority: Routine
- CVSS: 3.7 (low)
- EPSS: 0.0047
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Jul 20, 2025

## Description

In Mbed TLS 3.6.1 through 3.6.3 before 3.6.4, a timing discrepancy in block cipher padding removal allows an attacker to recover the plaintext when PKCS#7 padding mode is used.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | mbedtls Debian 13.5 (trixie) | 3.6.4-1 | [DEBIAN-CVE-2025-49087](https://patchblox.com/security/data/fix/linux/debian-cve-2025-49087.md) | Jul 20, 2025 |
| Linux | mbedtls Debian 14 | 3.6.4-1 | [DEBIAN-CVE-2025-49087](https://patchblox.com/security/data/fix/linux/debian-cve-2025-49087.md) | Jul 20, 2025 |
| Linux | mbedtls opensuse-leap 16.0 | 3.6.6-bp160.1.1 | [OPENSUSE-SU-2026:21144-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-21144-1.md) | Jun 22, 2026 |

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Data as of 2026-11-09T13:31:49Z 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 Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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