Know every vulnerabilitybefore it knows you.
DevGuard continuously monitors your dependencies and alerts you when CVEs like this one affect your stack — with real-time threat intelligence built for developers.
RUSTSEC-2026-0212
No affected components available
The implementation of constant-time swap and select on aarch64
platforms used a cmp instruction in inline assembly to check whether
an 8-bit wide selector was 0. The cmp instruction works on 32-bit
registers, which included the unspecified high 24 bits of the cmp operand.
Depending on the execution environment the cmp
could thus potentially return an incorrect result because its
operand's high bits in the inline assembly were set when Rust expected them to be unset.
This could lead to incorrect results for the constant-time swap and select
operations built from this comparison.
Impact
In certain circumstances the swap and select instructions on aarch64 platforms returned incorrect results.
Mitigation
Starting from version 0.0.6, the selector is compared using a tst
instruction with a mask, which only compares the first 8 bits of the
selector.
The vulnerability can be exploited over the network without needing physical access. It is easy for an attacker to exploit this vulnerability. An attacker does not need any special privileges or access rights. No user interaction is needed for the attacker to exploit this vulnerability.
Exploitation attempts have been detected. Elevated vigilance and prompt remediation are advised.
Probability that this vulnerability will be exploited in the wild within the next 30 days.
We did not find any exploit available. Neither in GitHub repositories nor in the Exploit-Database.
Browse More
Continuously monitor your dependencies and get alerted when vulnerabilities like this one affect your stack.
Checkout DevGuard