CVE-2026-41678: rust-openssl provides OpenSSL bindings for the Rust programming language

Q: How urgent is CVE-2026-41678?

Priority 42/100. High severity; Remotely exploitable, no login, no user action; On your watchlist

This month

HIGH 8.1REMOTEWATCHLISTUPGRADE

CVE-2026-41678 is a high-severity flaw (CVSS 8.1) 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 to before 0.10.78, aes::unwrap_key() contains an incorrect assertion: it checks that out.len() + 8 <= in_.len(), but this condition is reversed. The intended invariant is out.len() >= in_.len() - 8, ensuring the output buffer is large enough. Because of the inverted check, the function only accepts buffers at or below the minimum required size and rejects larger ones

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 score	8.1 (High)
Attack vector	Network (remote)
Attack complexity	High
Privileges needed	None
User interaction	None
EPSS exploit chance	0.3% (top 84%)
CISA exploited list	No
Weakness	CWE-787
Published	2026-04-24
Last modified	2026-07-17

Publisher (CNA): GitHub, Inc. · Vendor: rust-openssl project

Last updated 2026-07-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-04-24 18:16 UTCPublished CVE record published
2026-07-17 19:24 UTCUpdated Record last modified

rust-openssl project rust-openssl UPGRADE

Affected: >= 0.10.24 and < 0.10.78

Fixed in: 0.10.78

Safe to downgrade to: a release before 0.10.24

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 0.10.24 (Debian / Ubuntu)

apt-cache madison rust-openssl sudo apt install rust-openssl=<VERSION_BEFORE_0.10.24> 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_0.10.24> 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-2026-41678?

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

Is CVE-2026-41678 being exploited?

CVE-2026-41678 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-2026-41678 affect?

CVE-2026-41678 affects rust-openssl. Severity is high (CVSS 8.1). rust-openssl provides OpenSSL bindings for the Rust programming language. From to before 0.10.78, aes::unwrap_key() contains an incorrect assertion: it checks that out.len() + 8 <= in_.len(), but this condition is reversed. The intended i

How urgent is CVE-2026-41678?

Priority 42/100. High severity; Remotely exploitable, no login, no user action; On your watchlist

Software pages

OpenSSL vulnerabilities

Related CVEs

CVE-2026-41681 HIGH 7.5 UPGRADE rust-openssl provides OpenSSL bindings for the Rust programming language
CVE-2026-41676 HIGH 7.5 UPGRADE rust-openssl provides OpenSSL bindings for the Rust programming language
CVE-2026-41898 MEDIUM 5.3 UPGRADE rust-openssl provides OpenSSL bindings for the Rust programming language
CVE-2026-41677 CRITICAL 9.1 UPGRADE rust-openssl provides OpenSSL bindings for the Rust programming language

References

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