CVE catalog

CVE-2025-49087

mbedtls: CVE-2025-49087

Severity: Medium · CVSS 4CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:N/A:N
Published: Jul 20, 2025, 12:00:00 AM UTC
Source: [NVD] · [CVE record]
EPSS: 0.47% · Oct 25, 2026

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.

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	mbedtls	sid	`3.6.7-3`	fixed
Debian	mbedtls	forky	`3.6.7-3`	fixed
Debian	mbedtls	trixie	`3.6.6-0.1~deb13u1`	fixed
Debian	mbedtls	bookworm	`2.28.3-1`	not affected
Alpine	mbedtls	3.20	`3.6.4-r0`	fixed
Alpine	mbedtls	3.21	`3.6.4-r0`	fixed
Alpine	mbedtls	3.22	`3.6.4-r0`	fixed
Alpine	mbedtls	3.23	`3.6.4-r0`	fixed
Alpine	mbedtls	3.24	`3.6.4-r0`	fixed
Ubuntu	mbedtls	25.10	`3.6.2-3ubuntu1`	vulnerable
Ubuntu	mbedtls	26.04	`3.6.2-3ubuntu1`	vulnerable
Ubuntu	mbedtls	26.04	`3.6.5-0.1ubuntu1`	vulnerable
Ubuntu	mbedtls	26.04	`3.6.5-0.1ubuntu2`	vulnerable

Fixed-version evidence

Distribution	Package	Type	Release	Fixed version	Urgency	Origin	Bugs
Debian	mbedtls	source	sid	`3.6.4-1`	not yet assigned	Not reported	[1108789]
Debian	mbedtls	source	forky	`3.6.4-1`	not yet assigned	Not reported	[1108789]
Debian	mbedtls	source	trixie	`3.6.4-1`	not yet assigned	Not reported	[1108789]
Debian	mbedtls	source	bookworm	`Not affected`	unimportant	Not reported	[1108789]
Alpine	mbedtls	apk	3.20	`3.6.4-r0`	Not reported	ALPINE-CVE-2025-49087	Not reported
Alpine	mbedtls	apk	3.21	`3.6.4-r0`	Not reported	ALPINE-CVE-2025-49087	Not reported
Alpine	mbedtls	apk	3.22	`3.6.4-r0`	Not reported	ALPINE-CVE-2025-49087	Not reported
Alpine	mbedtls	apk	3.23	`3.6.4-r0`	Not reported	ALPINE-CVE-2025-49087	Not reported
Alpine	mbedtls	apk	3.24	`3.6.4-r0`	Not reported	ALPINE-CVE-2025-49087	Not reported

[Debian bug #1108789]

OpenFactory catalog packages

[Debian 12 (Bookworm)]

[libmbedcrypto7]Not affected
Source package: [mbedtls]
Details (2)
- 2.28.3-1 · amd64 · bookworm
  Not affected
  dsa · mbedtls · debian · bookworm
- 2.28.3-1 · arm64 · bookworm
  Not affected
  dsa · mbedtls · debian · bookworm
[libmbedtls14]Not affected
Source package: [mbedtls]
Details (2)
- 2.28.3-1 · amd64 · bookworm
  Not affected
  dsa · mbedtls · debian · bookworm
- 2.28.3-1 · arm64 · bookworm
  Not affected
  dsa · mbedtls · debian · bookworm
[libmbedtls-dev]Not affected
Source package: [mbedtls]
Details (2)
- 2.28.3-1 · amd64 · bookworm
  Not affected
  dsa · mbedtls · debian · bookworm
- 2.28.3-1 · arm64 · bookworm
  Not affected
  dsa · mbedtls · debian · bookworm
[libmbedtls-doc]Not affected
Source package: [mbedtls]
Details (2)
- 2.28.3-1 · all · bookworm
  Not affected
  dsa · mbedtls · debian · bookworm
- 2.28.3-1 · all · bookworm
  Not affected
  dsa · mbedtls · debian · bookworm
[libmbedx509-1]Not affected
Source package: [mbedtls]
Details (2)
- 2.28.3-1 · amd64 · bookworm
  Not affected
  dsa · mbedtls · debian · bookworm
- 2.28.3-1 · arm64 · bookworm
  Not affected
  dsa · mbedtls · debian · bookworm

[Debian 13 (Trixie)]

[libmbedcrypto16]Fixed
Source package: [mbedtls]
Details (2)
- 3.6.5-0.1~deb13u1 · amd64 · trixie
  Fixed · Fixed: 3.6.4-1
  dsa · mbedtls · debian · 13
- 3.6.5-0.1~deb13u1 · arm64 · trixie
  Fixed · Fixed: 3.6.4-1
  dsa · mbedtls · debian · 13
[libmbedtls21]Fixed
Source package: [mbedtls]
Details (2)
- 3.6.5-0.1~deb13u1 · amd64 · trixie
  Fixed · Fixed: 3.6.4-1
  dsa · mbedtls · debian · 13
- 3.6.5-0.1~deb13u1 · arm64 · trixie
  Fixed · Fixed: 3.6.4-1
  dsa · mbedtls · debian · 13
[libmbedtls-dev]Fixed
Source package: [mbedtls]
Details (2)
- 3.6.5-0.1~deb13u1 · amd64 · trixie
  Fixed · Fixed: 3.6.4-1
  dsa · mbedtls · debian · 13
- 3.6.5-0.1~deb13u1 · arm64 · trixie
  Fixed · Fixed: 3.6.4-1
  dsa · mbedtls · debian · 13
[libmbedtls-doc]Fixed
Source package: [mbedtls]
Details (2)
- 3.6.5-0.1~deb13u1 · all · trixie
  Fixed · Fixed: 3.6.4-1
  dsa · mbedtls · debian · 13
- 3.6.5-0.1~deb13u1 · all · trixie
  Fixed · Fixed: 3.6.4-1
  dsa · mbedtls · debian · 13
[libmbedx509-7]Fixed
Source package: [mbedtls]
Details (2)
- 3.6.5-0.1~deb13u1 · amd64 · trixie
  Fixed · Fixed: 3.6.4-1
  dsa · mbedtls · debian · 13
- 3.6.5-0.1~deb13u1 · arm64 · trixie
  Fixed · Fixed: 3.6.4-1
  dsa · mbedtls · debian · 13

Observed: Oct 24, 2026, 8:58:41 PM UTC

References

[Debian Security Tracker] · [FIRST EPSS] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX] · [SUSE security advisories and VEX]