Mbed TLS before 3.6.4 allows a use-after-free in certain situations of applications that are developed in accordance with the documentation. The funct...
Fix status by distribution
Fixed packages published by each distribution for this CVE
- Alpine Linux ALPINE-CVE-2025-47917 mbedtls Fixed in: 3.6.4-r0
- Debian DEBIAN-CVE-2025-47917 mbedtls Fixed in: 2.16.9-0.1+deb11u3
Original description The description as published by the source.
Mbed TLS before 3.6.4 allows a use-after-free in certain situations of applications that are developed in accordance with the documentation. The function mbedtls_x509_string_to_names() takes a head argument that is documented as an output argument. The documentation does not suggest that the function will free that pointer; however, the function does call mbedtls_asn1_free_named_data_list() on that argument, which performs a deep free(). As a result, application code that uses this function (relying only on documented behavior) is likely to still hold pointers to the memory blocks that were freed, resulting in a high risk of use-after-free or double-free. In particular, the two sample programs x509/cert_write and x509/cert_req are affected (use-after-free if the san string contains more than one DN).
References
- advisory github.com
- advisory github.com
- advisory mbed-tls.readthedocs.io
- advisory nvd.nist.gov
- web lists.debian.org
- web lists.debian.org