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CVE-2026-35189: Issue summary: A certificate with many nameRelativeToCRLIssuer CRL distribution points causes disproportionate

38
Routine
MEDIUM 5.3REMOTEWATCHLISTUPGRADE

CVE-2026-35189 is a medium-severity flaw (CVSS 5.3) affecting openssl. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Issue summary: A certificate with many nameRelativeToCRLIssuer CRL distribution points causes disproportionate heap growth when OpenSSL caches X.509 extensions. Impact summary: Receiving a crafted certificate from a malicious peer can lead to significant memory pressure and possible Denial of Service in clients or in servers that solicit client certificates. CWE: CWE-770: Allocation of Resources Without Limits or Throttling Description: A cert

Why this priority

  • Covered by 3 security sources
  • Remotely exploitable, no login, no user action
  • On your watchlist

A fixed release or distro patch exists.

Risk facts

CVSS score5.3 (Medium)
Attack vectorNetwork (remote)
Attack complexityLow
Privileges neededNone
User interactionNone
EPSS exploit chance0.3% (top 76%)
CISA exploited listNo
WeaknessCWE-770
Published2026-09-29
Last modified2026-10-08
Publisher (CNA): OpenSSL Software Foundation · Vendor: openssl

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Last updated 2026-10-08 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

openssl openssl UPGRADE
Affected: >= 1.0.2 and < 1.0.2zs · >= 1.1.1 and < 1.1.1zj · >= 3.0.0 and < 3.0.23 · >= 3.4.0 and < 3.4.8 · >= 3.5.0 and < 3.5.9 · >= 3.6.0 and < 3.6.5 · >= 4.0.0 and < 4.0.3
Fixed in: 1.0.2zs, 1.1.1zj, 3.0.23, 3.4.8, 3.5.9, 3.6.5, 4.0.3
Safe to downgrade to: no unaffected older release
1. Check installed version
apt-cache policy openssl || rpm -q openssl || openssl --version
2. UPGRADE to 1.0.2zs (Debian / Ubuntu)
sudo apt update && sudo apt install --only-upgrade openssl
2. UPGRADE (RHEL / Amazon Linux / Fedora)
sudo dnf upgrade openssl
Note
Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Advisories and coverage

Official advisories

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-2026-35189?

openssl: upgrade to 1.0.2zs, 1.1.1zj, 3.0.23, 3.4.8, 3.5.9, 3.6.5, 4.0.3. Exact commands for each OS are on this page.

Is CVE-2026-35189 being exploited?

CVE-2026-35189 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-2026-35189 affect?

CVE-2026-35189 affects openssl. Severity is medium (CVSS 5.3). Issue summary: A certificate with many nameRelativeToCRLIssuer CRL distribution points causes disproportionate heap growth when OpenSSL caches X.509 extensions. Impact summary: Receiving a crafted certificate from a malicious peer can lead

How urgent is CVE-2026-35189?

Priority 38/100. Covered by 3 security sources; Remotely exploitable, no login, no user action; On your watchlist

Software pages

OpenSSL vulnerabilities

Related CVEs

References

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