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CVE-2026-41898: rust-openssl provides OpenSSL bindings for the Rust programming language

34
Routine
MEDIUM 5.3REMOTEWATCHLISTUPGRADE

CVE-2026-41898 is a medium-severity flaw (CVSS 5.3) affecting rust-openssl. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

rust-openssl provides OpenSSL bindings for the Rust programming language. From 0.9.24 to before 0.10.78, 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 unint

Why this priority

  • Remotely exploitable, no login, no user action
  • On your watchlist

A fixed release or distro patch exists.

Risk facts

CVSS score5.3 (Medium)
Attack vectorNetwork (remote)
Attack complexityLow
Privileges neededNone
User interactionNone
EPSS exploit chance0.3% (top 80%)
CISA exploited listNo
WeaknessCWE-126, CWE-130
Published2026-04-24
Last modified2026-07-15
Publisher (CNA): GitHub, Inc. · Vendor: rust-openssl project

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Last updated 2026-07-15 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

rust-openssl project rust-openssl UPGRADE
Affected: >= 0.9.24 and < 0.10.78
Fixed in: 0.10.78
Safe to downgrade to: a release before 0.9.24
1. Check installed version
apt-cache policy rust-openssl || rpm -q rust-openssl || rust-openssl --version
2. UPGRADE to 0.10.78 (Debian / Ubuntu)
sudo apt update && sudo apt install --only-upgrade rust-openssl
2. UPGRADE (RHEL / Amazon Linux / Fedora)
sudo dnf upgrade rust-openssl
Note
Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.
3. If no update is available yet, DOWNGRADE to a release before 0.9.24 (Debian / Ubuntu)
apt-cache madison rust-openssl sudo apt install rust-openssl=<VERSION_BEFORE_0.9.24> sudo apt-mark hold rust-openssl
3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)
dnf --showduplicates list rust-openssl sudo dnf downgrade rust-openssl-<VERSION_BEFORE_0.9.24> sudo dnf versionlock add rust-openssl
Downgrade risk
Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.
After downgrade
Restart the service, and keep the package held until a fixed release ships.
Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-41898?

rust-openssl: upgrade to 0.10.78. Exact commands for each OS are on this page.

Is CVE-2026-41898 being exploited?

CVE-2026-41898 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-41898 affect?

CVE-2026-41898 affects rust-openssl. Severity is medium (CVSS 5.3). rust-openssl provides OpenSSL bindings for the Rust programming language. From 0.9.24 to before 0.10.78, the FFI trampolines behind SslContextBuilder::set_psk_client_callback, set_psk_server_callback, set_cookie_generate_cb, and set_statel

How urgent is CVE-2026-41898?

Priority 34/100. Remotely exploitable, no login, no user action; On your watchlist

Software pages

OpenSSL vulnerabilities

Related CVEs

References

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