Description
In ARM mbed TLS before 2.7.0, there is a bounds-check bypass through an integer overflow in PSK identity parsing in the ssl_parse_client_psk_identity() function in library/ssl_srv.c.
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | mbedtls | 2.7.0-2 | — |
| Debian 13 | mbedtls | 2.7.0-2 | — |
| Debian 12 | mbedtls | 2.7.0-2 | — |
| Debian 9 | mbedtls | 2.4.2-1+deb9u2 | DSA-4138-1 |
| Debian 8 | polarssl | 1.3.9-2.1+deb8u3 | DSA-4147-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 16.04 LTS | mbedtls | 2.2.1-2ubuntu0.3 | USN-4267-1 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SUSE Package Hub 12 | mbedtls | 1.3.19-11.1 | openSUSE-SU-2018:0491-1, openSUSE-SU-2018:0488-1 |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.24 | mbedtls +2 | 2.7.0-r0 | — |
| Alpine v3.23 | mbedtls +1 | 2.7.0-r0 | — |
| Alpine v3.22 | mbedtls +1 | 2.7.0-r0 | — |
| Alpine v3.21 | mbedtls +1 | 2.7.0-r0 | — |
| Alpine v3.20 | mbedtls +1 | 2.7.0-r0 | — |
Show 12 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.19 | mbedtls | 2.7.0-r0 | — |
| Alpine v3.18 | mbedtls | 2.7.0-r0 | — |
| Alpine v3.17 | mbedtls | 2.7.0-r0 | — |
| Alpine v3.16 | mbedtls | 2.7.0-r0 | — |
| Alpine v3.15 | mbedtls | 2.7.0-r0 | — |
| Alpine v3.14 | mbedtls | 2.7.0-r0 | — |
| Alpine v3.13 | mbedtls | 2.7.0-r0 | — |
| Alpine v3.12 | mbedtls | 2.7.0-r0 | — |
| Alpine v3.11 | mbedtls | 2.7.0-r0 | — |
| Alpine v3.10 | mbedtls | 2.7.0-r0 | — |
| Alpine v3.9 | mbedtls | 2.7.0-r0 | — |
| Alpine v3.8 | mbedtls | 2.7.0-r0 | — |
Advisories 5
- USN-4267-1 mbedtls vulnerabilities Ubuntu Security Notices (USN) · Apr 27, 2026
- DSA-4138-1 mbedtls - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DSA-4147-1 polarssl - security update Debian Security (DSA / DLA) · Mar 9, 2026
- openSUSE-SU-2018:0488-1 Security update for mbedtls SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2018:0491-1 Security update for mbedtls SUSE / openSUSE Security Updates · May 7, 2025
References
- https://github.com/ARMmbed/mbedtls/commit/83c9f495ffe70c7dd280b41fdfd4881485a3bc28
- DSA-4147 vendor-advisory
- DSA-4138 vendor-advisory
- GLSA-201804-19 vendor-advisory
- https://github.com/ARMmbed/mbedtls/blob/master/ChangeLog
- 103055 vdb-entry
- USN-4267-1 vendor-advisory