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CVE-2026-41676: rust-openssl provides OpenSSL bindings for the Rust programming language

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HIGH 7.5REMOTEWATCHLISTUPGRADE

CVE-2026-41676 is a high-severity flaw (CVSS 7.5) 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 0.9.27 to before 0.10.78, Deriver::derive (and PkeyCtxRef::derive) sets len = buf.len() and passes it as the in/out length to EVP_PKEY_derive, relying on OpenSSL to honor it. On OpenSSL 1.1.x, X25519, X448, DH and HKDF-extract ignore the incoming *keylen, unconditionally writing the full shared secret (32/56/prime-size bytes). A caller passing a short slice gets a hea

Why this priority

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

A fixed release or distro patch exists.

Risk facts

CVSS score7.5 (High)
Attack vectorNetwork (remote)
Attack complexityLow
Privileges neededNone
User interactionNone
EPSS exploit chance0.3% (top 79%)
CISA exploited listNo
WeaknessCWE-131, CWE-787
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: >= 0.9.27 and < 0.10.78
Fixed in: 0.10.78
Safe to downgrade to: a release before 0.9.27
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 0.9.27 (Debian / Ubuntu)
apt-cache madison rust-openssl sudo apt install rust-openssl=<VERSION_BEFORE_0.9.27> 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_0.9.27> 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-2026-41676?

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

Is CVE-2026-41676 being exploited?

CVE-2026-41676 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-2026-41676 affect?

CVE-2026-41676 affects rust-openssl. Severity is high (CVSS 7.5). rust-openssl provides OpenSSL bindings for the Rust programming language. From 0.9.27 to before 0.10.78, Deriver::derive (and PkeyCtxRef::derive) sets len = buf.len() and passes it as the in/out length to EVP_PKEY_derive, relying on OpenSS

How urgent is CVE-2026-41676?

Priority 41/100. High severity; Remotely exploitable, no login, no user action; On your watchlist

Software pages

OpenSSL vulnerabilities

Related CVEs

References

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