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No exploitation reportedFix available

CVE-2026-21895

No exploitation reported by the sources we read.

  • Published2026-01-08
  • Fixed in0.9.10
  • WeaknessCWE-703

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

The `rsa` crate is an RSA implementation written in rust. Prior to version 0.9.10, when creating a RSA private key from its components, the construction panics instead of returning an error when one of the primes is `1`. Version 0.9.10 fixes the issue.

Timeline

dates in UTC
  1. 2026-01-0814:15CVE publishedNVD

Versions per branch

NVD · OSV
Rustcrypto rsa
BranchAffectedFixed in
0.9< 0.9.100.9.10

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Products declared by the CNA1 product

As GitHub_M, the CNA that assigned this CVE, declared them in the CVE record; versions as written.

  • RustCrypto RSA
    Affected
    • = < 0.9.10no fix stated

Source: the CNA record (CVE Program), © The MITRE Corporation,CVE Terms of UseCVE recordupdated 2026-01-08

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

  • atuinWolfiall versions · fixed in 18.10.0-r1
  • atuinChainguardall versions · fixed in 18.10.0-r1
  • denoWolfiall versions · fixed in 2.6.4-r1
  • denoChainguardall versions · fixed in 2.6.4-r1
  • lycheeWolfiall versions · fixed in 0.22.0-r1
  • lycheeChainguardall versions · fixed in 0.22.0-r1
  • py3.10-uv-buildMinimOSall versions · fixed in 0.10.5-r0and 12 other packages
  • qdrantWolfiall versions · fixed in 1.16.3-r1

21 more package ranges on OSV.dev

Full record on NVD

Fix

  1. Update Rustcrypto rsa to 0.9.10

Advisories and patches

Detection

Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof of concept
Metasploit modules
none listed
Metasploit Framework

Sources

  • CISA-ADPSSVC decisionnone2026-01-08
  • CNACVSS 4.02.7known since 2026-10-23
  • NVDCVSS 3.15.3read 2026-10-23
  • CNAweakness (CWE)CWE-703known since 2026-10-23
  • FIRST EPSSEPSS score0.4 %2026-11-08
  • OSVaffected packages—
  • GitHub AdvisoriesadvisoryLOW2026-01-06

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
CVSS 4.0 vector
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
Published
2026-01-08
Last Modified
2026-06-17
NVD status
Analyzed
GitHub Advisory
GHSA-9c48-w39g-hm26

Frequently asked questions

What is CVE-2026-21895?

The `rsa` crate is an RSA implementation written in rust. Prior to version 0.9.10, when creating a RSA private key from its components, the construction panics instead of returning an error when one of the primes is `1`. Version 0.9.10 fixes the issue.

Is CVE-2026-21895 actively exploited?

Active exploitation of CVE-2026-21895 has not been confirmed. Its EPSS score was 0.4% on 2026-11-08, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2026-21895?

CVE-2026-21895 has a CVSS v3 base score of 5.3 (MEDIUM severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L.

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