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CVE-2026-41677: rust-openssl provides OpenSSL bindings for the Rust programming language

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This month
CRITICAL 9.1REMOTEWATCHLISTUPGRADE

CVE-2026-41677 is a critical-severity flaw (CVSS 9.1) 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 0.9.0 to before 0.10.78, the *_from_pem_callback APIs did not validate the length returned by the user's callback. A password callback that returns a value larger than the buffer it was given can cause some versions of OpenSSL to over-read this buffer. OpenSSL 3.x is not affected by this. This vulnerability is fixed in 0.10.78.

Why this priority

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

A fixed release or distro patch exists.

Risk facts

CVSS score9.1 (Critical)
Attack vectorNetwork (remote)
Attack complexityLow
Privileges neededNone
User interactionNone
EPSS exploit chance0.3% (top 78%)
CISA exploited listNo
WeaknessCWE-125, CWE-1284
Published2026-04-24
Last modified2026-06-17
Publisher (CNA): GitHub, Inc. · Vendor: rust-openssl project

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Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

rust-openssl project rust-openssl UPGRADE
Affected: >= 0.9.0 and < 0.10.78
Fixed in: 0.10.78
Safe to downgrade to: a release before 0.9.0
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 0.9.0 (Debian / Ubuntu)
apt-cache madison rust-openssl sudo apt install rust-openssl=<VERSION_BEFORE_0.9.0> 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_0.9.0> 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-2026-41677?

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

Is CVE-2026-41677 being exploited?

CVE-2026-41677 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-2026-41677 affect?

CVE-2026-41677 affects rust-openssl. Severity is critical (CVSS 9.1). rust-openssl provides OpenSSL bindings for the Rust programming language. From 0.9.0 to before 0.10.78, the *_from_pem_callback APIs did not validate the length returned by the user's callback. A password callback that returns a value larg

How urgent is CVE-2026-41677?

Priority 47/100. Critical severity; Remotely exploitable, no login, no user action; On your watchlist

Software pages

OpenSSL vulnerabilities

Related CVEs

References

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