CVE-2025-59438
published 2025-10-21CVE-2025-59438: Mbed TLS through 3.6.4 has an Observable Timing Discrepancy.
PriorityP425medium5.3CVSS 3.1
AVNACLPRNUINSUCLINAN
EPSS
0.24%
15.0th percentile
Mbed TLS through 3.6.4 has an Observable Timing Discrepancy.
Affected
4 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| arm | mbed_tls | < 3.6.5 | 3.6.5 |
| debian | mbedtls | < mbedtls 3.6.5-0.1 (forky) | mbedtls 3.6.5-0.1 (forky) |
| mbed | mbedtls | >= 0 < 3.6.5-0.1~deb13u1 | 3.6.5-0.1~deb13u1 |
| mbed | mbedtls | >= 0 < 3.6.5-0.1 | 3.6.5-0.1 |
CVSS provenance
nvdv3.15.3MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
osv5.3MEDIUM
vendor_debian5.3MEDIUM
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Debian
CVE-2025-59438: mbedtls - Mbed TLS through 3.6.4 has an Observable Timing Discrepancy.
vendor_debian·2025·CVSS 5.3
CVE-2025-59438 [MEDIUM] CVE-2025-59438: mbedtls - Mbed TLS through 3.6.4 has an Observable Timing Discrepancy.
Mbed TLS through 3.6.4 has an Observable Timing Discrepancy.
Scope: local
bookworm: open
bullseye: open
forky: resolved (fixed in 3.6.5-0.1)
sid: resolved (fixed in 3.6.5-0.1)
trixie: resolved (fixed in 3.6.5-0.1~deb13u1)
GHSA
GHSA-mqc9-9p37-h763: Mbed TLS through 3
ghsa_unreviewed·2025-10-21
CVE-2025-59438 [MEDIUM] CWE-208 GHSA-mqc9-9p37-h763: Mbed TLS through 3
Mbed TLS through 3.6.4 has an Observable Timing Discrepancy.
OSV
CVE-2025-59438: Mbed TLS through 3
osv·2025-10-21·CVSS 5.3
CVE-2025-59438 [MEDIUM] CVE-2025-59438: Mbed TLS through 3
Mbed TLS through 3.6.4 has an Observable Timing Discrepancy.
No detection rules found.
No public exploits indexed.
Bugzilla
CVE-2025-59438 dolphin-emu: MbedTLS Padding oracle through timing of cipher error reporting [fedora-42]
bugzilla·2025-10-21·CVSS 5.3
CVE-2025-59438 [MEDIUM] CVE-2025-59438 dolphin-emu: MbedTLS Padding oracle through timing of cipher error reporting [fedora-42]
CVE-2025-59438 dolphin-emu: MbedTLS Padding oracle through timing of cipher error reporting [fedora-42]
Disclaimer: Community trackers are created by Red Hat Product Security team on a best effort basis. Package maintainers are required to ascertain if the flaw indeed affects their package, before starting the update process.
The following link provides references to all essential vulnerability management information. If something is wrong or missing, please contact a member of PSIRT.
https://spaces.redhat.com/display/PRODSEC/Vulnerability+Management+-+Essential+Documents+for+Engineering+Teams
Discussion:
This message is a reminder that Fedora Linux 42 is nearing its end of life.
Fedora will stop maintaining and issuing updates for Fedora Linux 42 on 2026-05-13.
It is Fedora's policy t
Bugzilla
CVE-2025-59438 micropython: MbedTLS Padding oracle through timing of cipher error reporting [fedora-all]
bugzilla·2025-10-21·CVSS 5.3
CVE-2025-59438 [MEDIUM] CVE-2025-59438 micropython: MbedTLS Padding oracle through timing of cipher error reporting [fedora-all]
CVE-2025-59438 micropython: MbedTLS Padding oracle through timing of cipher error reporting [fedora-all]
Disclaimer: Community trackers are created by Red Hat Product Security team on a best effort basis. Package maintainers are required to ascertain if the flaw indeed affects their package, before starting the update process.
The following link provides references to all essential vulnerability management information. If something is wrong or missing, please contact a member of PSIRT.
https://spaces.redhat.com/display/PRODSEC/Vulnerability+Management+-+Essential+Documents+for+Engineering+Teams
Bugzilla
CVE-2025-59438 rust-psa-crypto-sys: MbedTLS Padding oracle through timing of cipher error reporting [fedora-42]
bugzilla·2025-10-21·CVSS 5.3
CVE-2025-59438 [MEDIUM] CVE-2025-59438 rust-psa-crypto-sys: MbedTLS Padding oracle through timing of cipher error reporting [fedora-42]
CVE-2025-59438 rust-psa-crypto-sys: MbedTLS Padding oracle through timing of cipher error reporting [fedora-42]
Disclaimer: Community trackers are created by Red Hat Product Security team on a best effort basis. Package maintainers are required to ascertain if the flaw indeed affects their package, before starting the update process.
The following link provides references to all essential vulnerability management information. If something is wrong or missing, please contact a member of PSIRT.
https://spaces.redhat.com/display/PRODSEC/Vulnerability+Management+-+Essential+Documents+for+Engineering+Teams
Discussion:
This message is a reminder that Fedora Linux 42 is nearing its end of life.
Fedora will stop maintaining and issuing updates for Fedora Linux 42 on 2026-05-13.
It is Fedora's
Bugzilla
CVE-2025-59438 mbedtls: MbedTLS Padding oracle through timing of cipher error reporting [epel-10]
bugzilla·2025-10-21·CVSS 5.3
CVE-2025-59438 [MEDIUM] CVE-2025-59438 mbedtls: MbedTLS Padding oracle through timing of cipher error reporting [epel-10]
CVE-2025-59438 mbedtls: MbedTLS Padding oracle through timing of cipher error reporting [epel-10]
Disclaimer: Community trackers are created by Red Hat Product Security team on a best effort basis. Package maintainers are required to ascertain if the flaw indeed affects their package, before starting the update process.
The following link provides references to all essential vulnerability management information. If something is wrong or missing, please contact a member of PSIRT.
https://spaces.redhat.com/display/PRODSEC/Vulnerability+Management+-+Essential+Documents+for+Engineering+Teams
Discussion:
This package has changed maintainer in Fedora. Reassigning to the new maintainer of this component.
---
FEDORA-EPEL-2026-479c1d4133 (mbedtls-3.6.6-1.el10_1) has been submitted as an updat
2025-10-21
Published