CVE-2026-41898
rust-openssl: Unchecked callback length in PSK/cookie trampolines leaks adjacent memory to peer
9.8
CRITICAL
CVSS 3.1
EPSS 0.06%
Description
The FFI trampolines behind `SslContextBuilder::set_psk_client_callback`, `set_psk_server_callback`, `set_cookie_generate_cb`, and `set_stateless_cookie_generate_cb` forwarded the user closure's returned usize directly to OpenSSL without checking it against the `&mut [u8]` that was handed to the closure. This can lead to buffer overflows and other unintended consequences.
How to fix CVE-2026-41898
To remediate CVE-2026-41898, upgrade the affected package to a fixed version below.
- —upgrade to 0.10.78 or later
- —no fix listed
Is CVE-2026-41898 being exploited?
Low — EPSS is 0.1%, meaning exploitation activity has not been observed at scale.
Affected packages (2)
- >= 0.9.24, < 0.10.78
- from 0
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 4.0 | — | CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:N/VA:L/SC:N/SI:N/SA:N |
| osv | CVSS 3.1 | CRITICAL9.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |