October 20, 2026

CVE Watchtower

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CVE-2026-35189NVD

Vulnerability Summary

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 certificate or a set of certificates that fits under the limit for
size of certificates accepted from the peer (~100 KiB) can result in allocation
of several hundred MiB of resident memory on the receiving side
during a normal TLS handshake. This may be enough to crash the client or
server, if multiple concurrent connections lead to similarly large memory
allocations.

The fix postpones processing of the CRL distribution points extensions in
certificates to the time when the processed value is required for CRL processing.
This avoids keeping large memory allocations for a long time when such
certificates are received.

FIPS impact: no
The affected code is outside the FIPS module boundary.
Severity Level
MEDIUM(5.3)
Published Date
Sep 29, 2026
Last Modified
Oct 8, 2026
Exploitation Status
No confirmed exploitation yet
EPSS Score (30-Day)
0.27%Probability
Root Weakness (CWE)
CWE-770: Unknown/Unlisted Weakness ↗
Refer to the official MITRE database for detailed architectural specifications regarding this weakness.
CVSS v3.1 Base Metrics — Score 5.3 (MEDIUM)
Attack VectorNetwork
Attack ComplexityLow
Privileges RequiredNone
User InteractionNone
ScopeUnchanged
ConfidentialityNone
IntegrityNone
AvailabilityLow

Affected & Patched Versions

Affected Versions
  • Openssl Openssl >= 1.0.2 and < 1.0.2zs
  • Openssl Openssl >= 1.1.1 and < 1.1.1zj
  • Openssl Openssl >= 3.0.0 and < 3.0.23
  • Openssl Openssl >= 3.4.0 and < 3.4.8
  • Openssl Openssl >= 3.5.0 and < 3.5.9
  • Openssl Openssl >= 3.6.0 and < 3.6.5
  • Openssl Openssl >= 4.0.0 and < 4.0.3
Patched Versions
  • Openssl Openssl 1.0.2zs
  • Openssl Openssl 1.1.1zj
  • Openssl Openssl 3.0.23
  • Openssl Openssl 3.4.8
  • Openssl Openssl 3.5.9
  • Openssl Openssl 3.6.5
  • Openssl Openssl 4.0.3
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🎁7-Day Free Trial — Try Pro or Team, no card required.
📧Email Delivery — Threat intel straight to your inbox.
♾️Unlimited Vendors — Track your entire stack.
🚨All New CVEs — Be the first to know.
📈EPSS Spike Alerts — Catch rising risk before it peaks.
🎯Custom EPSS/CVSS — Filter noise, focus on risk.
🛡️Exploit Intel — A 2nd confirmed-exploit signal beyond KEV.
🐙GitHub Issues — Auto-tracked, no duplicates.
📬Weekly Digest — One clean summary, not inbox spam.
🏷️Watchlist Groups — Tag alerts by team (Infra/AppSec/SOC).
💬Webhooks — Slack & Teams integration.
🔀Smart Routing — Critical alerts to one channel, rest to another.
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External References