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CVE-2026-21895

19
FAUCET Score

CVE-2026-21895 affects the 'rsa' Rust crate prior to version 0.9.10, where creating an RSA private key with a prime value of '1' causes a panic instead of an error. This vulnerability has a low CVSS score of 2.7, indicating a low impact on availability, with no direct impact on confidentiality or integrity. There is currently no evidence of active exploitation, public exploit code, or significant community discussion or media coverage surrounding this issue.

Impacted Technologies

VendorProductVersion(s)CPE
< 0.9.10CPE matchmatch criteria
cpe:2.3:a:rustcrypto:rsa:*:*:*:*:*:rust:*:*

CVSS Data

CVSS version used by this source: 4.0

2.7LOW

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
NONE
Privileges Required
NONE
User Interaction
NONE
VS Confidentiality
NONE
VS Integrity
NONE
VS Availability
LOW
SS Confidentiality
NONE
SS Integrity
NONE
SS Availability
NONE
Exploit Maturity
UNREPORTED
CvssVersion
4.0

Exploit Intelligence

EPSS Score
0.40%
Probability of exploitation in next 30 days
EPSS Percentile
33.1%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0040 is in the 20th percentile among its peer group of 23,723 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.0 Mastodon, and 0.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.0 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (24)

rustpatch availablevia ghsa
Product: rsaFixed in: 0.9.10
redhatvendor investigatingvia redhat_api
Product: Confidential Compute AttestationFixed in: build-of-trustee/trustee-rhel9
redhatvendor investigatingvia redhat_api
Product: Confidential Compute AttestationFixed in: confidential-compute-attestation-tech-preview/trustee-rhel9
redhatvendor investigatingvia redhat_api
Product: Confidential Compute AttestationFixed in: openshift-sandboxed-containers/osc-monitor-rhel9
redhatvendor investigatingvia redhat_api
Product: Confidential Compute AttestationFixed in: openshift-sandboxed-containers/osc-operator-bundle
redhatvendor investigatingvia redhat_api
Product: Confidential Compute AttestationFixed in: openshift-sandboxed-containers/osc-podvm-builder-rhel9
redhatvendor investigatingvia redhat_api
Product: Confidential Compute AttestationFixed in: openshift-sandboxed-containers/osc-podvm-payload-rhel9
redhatvendor investigatingvia redhat_api
Product: Confidential Compute AttestationFixed in: openshift-sandboxed-containers/osc-rhel9-operator
redhatvendor investigatingvia redhat_api
Product: Logging Subsystem for Red Hat OpenShiftFixed in: openshift-logging/cluster-logging-operator-bundle
redhatvendor investigatingvia redhat_api
Product: Logging Subsystem for Red Hat OpenShiftFixed in: openshift-logging/cluster-logging-rhel9-operator
redhatvendor investigatingvia redhat_api
Product: Logging Subsystem for Red Hat OpenShiftFixed in: openshift-logging/eventrouter-rhel9
redhatvendor investigatingvia redhat_api
Product: Logging Subsystem for Red Hat OpenShiftFixed in: openshift-logging/fluentd-rhel9
redhatvendor investigatingvia redhat_api
Product: Logging Subsystem for Red Hat OpenShiftFixed in: openshift-logging/log-file-metric-exporter-rhel9
redhatvendor investigatingvia redhat_api
Product: Logging Subsystem for Red Hat OpenShiftFixed in: openshift-logging/logging-view-plugin-rhel9
redhatvendor investigatingvia redhat_api
Product: Logging Subsystem for Red Hat OpenShiftFixed in: openshift-logging/vector-rhel9
redhatvendor investigatingvia redhat_api
Product: Red Hat Enterprise Linux 10Fixed in: rust-sequoia-sq
redhatvendor investigatingvia redhat_api
Product: Red Hat Enterprise Linux 10Fixed in: rust-sequoia-sqv
redhatvendor investigatingvia redhat_api
Product: Red Hat Enterprise Linux 10Fixed in: trustee-guest-components
redhatvendor investigatingvia redhat_api
Product: Red Hat Enterprise Linux 10Fixed in: virt-firmware-rs
redhatvendor investigatingvia redhat_api
Product: Red Hat Enterprise Linux 9Fixed in: trustee-guest-components
redhatvendor investigatingvia redhat_api
Product: Red Hat OpenShift Container Platform 4Fixed in: kata-containers
redhatvendor investigatingvia redhat_api
Product: Red Hat OpenShift Container Platform 4Fixed in: openshift4/recert-rhel9
redhatvendor investigatingvia redhat_api
Product: Red Hat OpenShift Update ServiceFixed in: openshift-update-service/openshift-update-service-rhel8
redhatvendor investigatingvia redhat_api
Product: Red Hat Trusted Profile AnalyzerFixed in: rhtpa/rhtpa-trustification-service-rhel9

Vendor Advisories (3)

microsoft2026-Jan/CVE-2026-21895Low

rsa crate has potential panic on a prime being equal to 1

Jan 13, 2026
redhatCVE-2026-21895Low

RSA: RSA crate: Denial of Service due to malformed prime in private key generation

Jan 8, 2026
rustGHSA-9c48-w39g-hm26low

rsa crate has potential panic on a prime being equal to 1

Jan 6, 2026

References

github.com / RustCrypto/RSA/commit/2926c91bef7cb14a7ccd42220a698cf4b1b692f7
Patch
github.com / RustCrypto/RSA/security/advisories/GHSA-9c48-w39g-hm26
Vendor Advisory