CVE catalog

CVE-2025-52496

Mbed TLS vulnerabilities

Severity: High · CVSS 7.8CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:N
Published: Jul 4, 2025, 12:00:00 AM UTC
Source: [NVD] · [CVE record]
EPSS: 0.21% · Oct 25, 2026

Mbed TLS before 3.6.4 has a race condition in AESNI detection if certain compiler optimizations occur. An attacker may be able to extract an AES key from a multithreaded program, or perform a GCM forgery.

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`	vulnerable
Ubuntu	mbedtls	noble	Not reported	vulnerable
Ubuntu	mbedtls	noble	`2.28.8-1ubuntu0.1~esm1`	fixed
Ubuntu	libmbedcrypto7t64	noble	`2.28.8-1ubuntu0.1~esm1`	fixed
Ubuntu	libmbedtls-dev	noble	`2.28.8-1ubuntu0.1~esm1`	fixed
Ubuntu	libmbedtls-doc	noble	`2.28.8-1ubuntu0.1~esm1`	fixed
Ubuntu	libmbedtls14t64	noble	`2.28.8-1ubuntu0.1~esm1`	fixed
Ubuntu	libmbedx509-1t64	noble	`2.28.8-1ubuntu0.1~esm1`	fixed
Opensuse	mbedtls-2	leap 16.0	`2.28.10-bp160.2.1`	fixed
Opensuse	mbedtls-2	tumbleweed	`2.28.10-5.1`	fixed
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	16.04	`2.1.2-1`	vulnerable
Ubuntu	mbedtls	16.04	`2.2.0-1`	vulnerable
Ubuntu	mbedtls	16.04	`2.2.1-1`	vulnerable
Ubuntu	mbedtls	16.04	`2.2.1-2`	vulnerable
Ubuntu	mbedtls	16.04	`2.2.1-2ubuntu0.1`	vulnerable
Ubuntu	mbedtls	16.04	`2.2.1-2ubuntu0.2`	vulnerable
Ubuntu	mbedtls	16.04	`2.2.1-2ubuntu0.3`	vulnerable
Ubuntu	mbedtls	pro	`2.28.3-1`	vulnerable
Ubuntu	mbedtls	pro	`2.28.6-1ubuntu1`	vulnerable
Ubuntu	mbedtls	pro	`2.28.7-1ubuntu1`	vulnerable
Ubuntu	mbedtls	pro	`2.28.7-1.1ubuntu1`	vulnerable
Ubuntu	mbedtls	pro	`2.28.8-1`	vulnerable
Ubuntu	mbedtls	pro	`2.28.8-1ubuntu0.1~esm1`	fixed
Ubuntu	mbedtls	25.10	`3.6.2-3ubuntu1`	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	[1108785]
Debian	mbedtls	source	forky	`3.6.4-1`	not yet assigned	Not reported	[1108785]
Debian	mbedtls	source	trixie	`3.6.4-1`	not yet assigned	Not reported	[1108785]
Debian	mbedtls	source	bookworm	`(unfixed)`	end-of-life	Not reported	[1108785]
Ubuntu	mbedtls	deb	noble	`2.28.8-1ubuntu0.1~esm1`	Not reported	Not reported	Not reported
Ubuntu	libmbedcrypto7t64	deb	noble	`2.28.8-1ubuntu0.1~esm1`	Not reported	Not reported	Not reported
Ubuntu	libmbedtls-dev	deb	noble	`2.28.8-1ubuntu0.1~esm1`	Not reported	Not reported	Not reported
Ubuntu	libmbedtls-doc	deb	noble	`2.28.8-1ubuntu0.1~esm1`	Not reported	Not reported	Not reported
Ubuntu	libmbedtls14t64	deb	noble	`2.28.8-1ubuntu0.1~esm1`	Not reported	Not reported	Not reported
Ubuntu	libmbedx509-1t64	deb	noble	`2.28.8-1ubuntu0.1~esm1`	Not reported	Not reported	Not reported
Opensuse	mbedtls-2	rpm	leap 16.0	`2.28.10-bp160.2.1`	Not reported	OPENSUSE-SU-2026:21864-1	Not reported
Opensuse	mbedtls-2	rpm	tumbleweed	`2.28.10-5.1`	Not reported	OPENSUSE-SU-2026:11790-1	Not reported
Alpine	mbedtls	apk	3.20	`3.6.4-r0`	Not reported	ALPINE-CVE-2025-52496	Not reported
Alpine	mbedtls	apk	3.21	`3.6.4-r0`	Not reported	ALPINE-CVE-2025-52496	Not reported
Alpine	mbedtls	apk	3.22	`3.6.4-r0`	Not reported	ALPINE-CVE-2025-52496	Not reported
Alpine	mbedtls	apk	3.23	`3.6.4-r0`	Not reported	ALPINE-CVE-2025-52496	Not reported
Alpine	mbedtls	apk	3.24	`3.6.4-r0`	Not reported	ALPINE-CVE-2025-52496	Not reported
Ubuntu	mbedtls	deb	pro	`2.28.8-1ubuntu0.1~esm1`	Not reported	UBUNTU-CVE-2025-52496	Not reported

[Debian bug #1108785]

OpenFactory catalog packages

[Debian 12 (Bookworm)]

[libmbedcrypto7]Affected
Source package: [mbedtls]
Details (2)
- 2.28.3-1 · amd64 · bookworm
  Affected
  usn · mbedtls · debian · bookworm; usn · mbedtls · debian · 12
- 2.28.3-1 · arm64 · bookworm
  Affected
  usn · mbedtls · debian · bookworm; usn · mbedtls · debian · 12
[libmbedtls14]Affected
Source package: [mbedtls]
Details (2)
- 2.28.3-1 · amd64 · bookworm
  Affected
  usn · mbedtls · debian · bookworm; usn · mbedtls · debian · 12
- 2.28.3-1 · arm64 · bookworm
  Affected
  usn · mbedtls · debian · bookworm; usn · mbedtls · debian · 12
[libmbedtls-dev]Affected
Source package: [mbedtls]
Details (2)
- 2.28.3-1 · amd64 · bookworm
  Affected
  usn · mbedtls · debian · bookworm; usn · mbedtls · debian · 12
- 2.28.3-1 · arm64 · bookworm
  Affected
  usn · mbedtls · debian · bookworm; usn · mbedtls · debian · 12
[libmbedtls-doc]Affected
Source package: [mbedtls]
Details (2)
- 2.28.3-1 · all · bookworm
  Affected
  usn · mbedtls · debian · bookworm; usn · mbedtls · debian · 12
- 2.28.3-1 · all · bookworm
  Affected
  usn · mbedtls · debian · bookworm; usn · mbedtls · debian · 12
[libmbedx509-1]Affected
Source package: [mbedtls]
Details (2)
- 2.28.3-1 · amd64 · bookworm
  Affected
  usn · mbedtls · debian · bookworm; usn · mbedtls · debian · 12
- 2.28.3-1 · arm64 · bookworm
  Affected
  usn · mbedtls · debian · bookworm; usn · mbedtls · debian · 12

[openSUSE Tumbleweed]

[libmbedcrypto7]Unknown
Source package: [mbedtls-2]
Details (1)
- 2.28.10-4.3 · x86_64 · tumbleweed
  Unknown · Fixed: 2.28.10-5.1
  Version impact unknown
  usn · mbedtls-2 · opensuse · tumbleweed
[libmbedcrypto7-x86-64-v3]Unknown
Source package: [mbedtls-2]
Details (1)
- 2.28.10-4.3 · x86_64 · tumbleweed
  Unknown · Fixed: 2.28.10-5.1
  Version impact unknown
  usn · mbedtls-2 · opensuse · tumbleweed
[libmbedtls14]Unknown
Source package: [mbedtls-2]
Details (1)
- 2.28.10-4.3 · x86_64 · tumbleweed
  Unknown · Fixed: 2.28.10-5.1
  Version impact unknown
  usn · mbedtls-2 · opensuse · tumbleweed
[libmbedtls14-x86-64-v3]Unknown
Source package: [mbedtls-2]
Details (1)
- 2.28.10-4.3 · x86_64 · tumbleweed
  Unknown · Fixed: 2.28.10-5.1
  Version impact unknown
  usn · mbedtls-2 · opensuse · tumbleweed
[libmbedx509-1]Unknown
Source package: [mbedtls-2]
Details (1)
- 2.28.10-4.3 · x86_64 · tumbleweed
  Unknown · Fixed: 2.28.10-5.1
  Version impact unknown
  usn · mbedtls-2 · opensuse · tumbleweed
[libmbedx509-1-x86-64-v3]Unknown
Source package: [mbedtls-2]
Details (1)
- 2.28.10-4.3 · x86_64 · tumbleweed
  Unknown · Fixed: 2.28.10-5.1
  Version impact unknown
  usn · mbedtls-2 · opensuse · tumbleweed
[mbedtls-2-devel]Unknown
Source package: [mbedtls-2]
Details (1)
- 2.28.10-4.3 · x86_64 · tumbleweed
  Unknown · Fixed: 2.28.10-5.1
  Version impact unknown
  usn · mbedtls-2 · opensuse · tumbleweed

[Debian 13 (Trixie)]

[libmbedcrypto16]Fixed
Source package: [mbedtls]
Details (2)
- 3.6.5-0.1~deb13u1 · amd64 · trixie
  Fixed · Fixed: 3.6.4-1
  usn · mbedtls · debian · 13
- 3.6.5-0.1~deb13u1 · arm64 · trixie
  Fixed · Fixed: 3.6.4-1
  usn · mbedtls · debian · 13
[libmbedtls21]Fixed
Source package: [mbedtls]
Details (2)
- 3.6.5-0.1~deb13u1 · amd64 · trixie
  Fixed · Fixed: 3.6.4-1
  usn · mbedtls · debian · 13
- 3.6.5-0.1~deb13u1 · arm64 · trixie
  Fixed · Fixed: 3.6.4-1
  usn · 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
  usn · mbedtls · debian · 13
- 3.6.5-0.1~deb13u1 · arm64 · trixie
  Fixed · Fixed: 3.6.4-1
  usn · 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
  usn · mbedtls · debian · 13
- 3.6.5-0.1~deb13u1 · all · trixie
  Fixed · Fixed: 3.6.4-1
  usn · 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
  usn · mbedtls · debian · 13
- 3.6.5-0.1~deb13u1 · arm64 · trixie
  Fixed · Fixed: 3.6.4-1
  usn · mbedtls · debian · 13

Observed: Oct 24, 2026, 9:16:52 PM UTC

References

[Debian Security Tracker] · [FIRST EPSS] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX] · [SUSE security advisories and VEX] · [Ubuntu Security Notices (USN)]