Input validation error in rust-openssl - CVE-2026-42327

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Main Vulnerability Database Vulnerabilities #VU129722

Input validation error in rust-openssl - CVE-2026-42327

Published: May 5, 2026


Vulnerability identifier: #VU129722
CSH Severity: Medium
CVSS v4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-42327
CWE-ID: CWE-20
Exploitation vector: Remote access
Exploit availability: No public exploit available

Vulnerability details

The vulnerability allows a remote attacker to trigger undefined behavior.

The vulnerability exists due to improper handling of non-UTF-8 data in X509Ref::ocsp_responders when parsing OCSP responder URLs from a certificate's AIA extension. A remote attacker can supply a specially crafted certificate to trigger undefined behavior.


Affected software

rust-openssl
SUSE Linux Enterprise Server 15 SP6
SUSE Linux Enterprise Server 15 SP4
SUSE Linux Enterprise Server 15 SP5
SUSE Linux Enterprise High Performance Computing 15
SUSE Linux Enterprise High Performance Computing ESPOS 15
SUSE Linux Enterprise High Performance Computing LTSS 15
SUSE Linux Enterprise Server 15
SUSE Linux Enterprise Server for SAP Applications 15
SUSE Linux Enterprise Real Time 15
SUSE Linux Enterprise Desktop 15
SUSE Manager Server
SUSE Manager Retail Branch Server
SUSE Manager Proxy
SUSE Linux Enterprise Micro for Rancher
SUSE Linux Enterprise Micro
Fedora
Public Cloud Module
Python 3 Module
Development Tools Module
openSUSE Leap
rust-eif_build
rust-ingredients
keylime-agent-rust
rust-keylime
rust-keylime-debuginfo
rust-oo7-cli
rust-cargo-vendor-filterer
rust-rpki
rust-nu
python311-maturin
aws-nitro-enclaves-cli-debuginfo
aws-nitro-enclaves-cli
aws-nitro-enclaves-cli-debugsource
system-group-ne
aws-nitro-enclaves-binaryblobs-upstream
aws-nitro-enclaves-binaryblobs-upstream-debuginfo
rust-tealdeer
rustup-debugsource
rustup-debuginfo
rustup
python311-cryptography
Open SDK for Rust on AIX

How to mitigate CVE-2026-42327

Install security update from vendor's website.

rust-openssl - update to 0.10.79
rust-eif_build - addressed in versions 0.2.1-7.el9, 0.2.1-7.fc43, 0.2.1-7.fc44
rust-ingredients - update to 0.2.2-4.fc43
keylime-agent-rust - addressed in versions 0.2.9-2.fc43, 0.2.9-2.fc44
rust-keylime - addressed in versions 0.2.9+49-150400.3.19.1, 0.2.9+49-150400.3.21.1, 0.2.9+49-150500.3.19.1
rust-keylime-debuginfo - addressed in versions 0.2.9+49-150400.3.19.1, 0.2.9+49-150400.3.21.1, 0.2.9+49-150500.3.19.1
rust-oo7-cli - update to 0.4.3-5.fc44
rust-cargo-vendor-filterer - addressed in versions 0.5.18-5.el9, 0.5.18-5.el10_2, 0.5.18-5.el10_3, 0.5.18-5.fc43, 0.5.18-5.fc44
rust-rpki - addressed in versions 0.18.6-4.el9, 0.18.6-4.el10_2, 0.18.6-4.el10_3, 0.18.6-4.fc43, 0.18.6-4.fc44
rust-nu - addressed in versions 0.99.1-17.el9, 0.99.1-17.fc43, 0.99.1-17.fc44
python311-maturin - update to 1.4.0-150600.3.15.1
aws-nitro-enclaves-cli-debuginfo - update to 1.4.5~git0.18a5f6f-150600.10.12.1
aws-nitro-enclaves-cli - update to 1.4.5~git0.18a5f6f-150600.10.12.1
aws-nitro-enclaves-cli-debugsource - update to 1.4.5~git0.18a5f6f-150600.10.12.1
system-group-ne - update to 1.4.5~git0.18a5f6f-150600.10.12.1
aws-nitro-enclaves-binaryblobs-upstream - update to 1.4.5~git0.18a5f6f-150600.10.12.1
aws-nitro-enclaves-binaryblobs-upstream-debuginfo - update to 1.4.5~git0.18a5f6f-150600.10.12.1
rust-tealdeer - addressed in versions 1.7.3-2.fc43, 1.7.3-2.fc44
rustup-debugsource - update to 1.28.2~0-150600.10.13.1
rustup-debuginfo - update to 1.28.2~0-150600.10.13.1
rustup - update to 1.28.2~0-150600.10.13.1
rustup - addressed in versions 1.29.0-4.fc43, 1.29.0-4.fc44
Open SDK for Rust on AIX - addressed in versions 1.92 Fix Pack 1, 1.94 Fix Pack 3
python311-cryptography - addressed in versions 41.0.3-150400.16.25.1, 41.0.3-150600.23.9.1

External References

Related Security Bulletins