Rust is a multi-paradigm programming language focused on performance and safety, especially safe concurrency.

Rust

ASN.1 strings are represented internally within OpenSSL as an ASN1_STRING
structure which contains a buffer holding the string data and a field holding
the buffer length. This contrasts with normal C strings which are represented as
a buffer for the string data which is terminated with a NUL (0) byte.
Although not a strict requirement, ASN.1 strings that are parsed using OpenSSL's
own "d2i" functions (and other similar parsing functions) as well as any string
whose value has been set with the ASN1_STRING_set() function will additionally
NUL terminate the byte array in the ASN1_STRING structure.
However, it is possible for applications to directly construct valid ASN1_STRING
structures which do not NUL terminate the byte array by directly setting the
"data" and "length" fields in the ASN1_STRING array. This can also happen by
using the `ASN1_STRING_set0()` function.
Numerous OpenSSL functions that print ASN.1 data have been found to assume that
the ASN1_STRING byte array will be NUL terminated, even though this is not
guaranteed for strings that have been directly constructed. Where an application
requests an ASN.1 structure to be printed, and where that ASN.1 structure
contains ASN1_STRINGs that have been directly constructed by the application
without NUL terminating the "data" field, then a read buffer overrun can occur.
The same thing can also occur during name constraints processing of certificates
(for example if a certificate has been directly constructed by the application
instead of loading it via the OpenSSL parsing functions, and the certificate
contains non NUL terminated ASN1_STRING structures). It can also occur in the
`X509_get1_email()`, `X509_REQ_get1_email()` and `X509_get1_ocsp()` functions.
If a malicious actor can cause an application to directly construct an
ASN1_STRING and then process it through one of the affected OpenSSL functions
then this issue could be hit. This might result in a crash (causing a Denial of
Service attack). It could also result in the disclosure of private memory
contents (such as private keys, or sensitive plaintext).

CVE ID	Severity	Score	Technologies	Component name	CISA KEV exploit	Has fix	Published date
GHSA-2fjw-whxm-9v4q	CRITICAL	9.3	Rust	nftnl	No	Yes	Nov 25, 2025
CVE-2025-66017	HIGH	8.2	Rust	cggmp21	No	Yes	Nov 25, 2025
GHSA-mj73-j457-8x9q	LOW	2.7	Rust	maxminddb	No	Yes	Dec 02, 2025
GHSA-pq5v-rwp8-p7gm	LOW	2.7	Rust	rtvm-interpreter	No	No	Dec 02, 2025
RUSTSEC-2025-0132	N/A	N/A	Rust	maxminddb	No	Yes	Nov 28, 2025

RUSTSEC-2021-0098:
Rust vulnerability analysis and mitigation

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RUSTSEC-2021-0098: Rust vulnerability analysis and mitigation