CVE-2026-35189 Details
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.
View at NVD
Exploit prediction scoring system (EPSS) score for CVE-2026-35189
EPSS (Exploit Prediction Scoring System): EPSS predicts the likelihood that a vulnerability will be exploited in the wild. A higher percentage means a greater chance of an exploit occurring. The EPSS model produces a probability score between 0 and 1 (0 and 100%).
0.32 Probability of exploitation activity being observed over the next 30 days (25th percentile)
CVSS score for CVE-2026-35189
CVSS (Common Vulnerability Scoring System): An open framework owned and managed by FIRST.Org, Inc. that assigns a numerical score from 0 to 10 to software vulnerabilities to indicate their severity.
5.3 Medium
Products affected by CVE-2026-35189
OpenSSL 1.1.1
OpenSSL 1.1.1a
OpenSSL 1.1.1b
OpenSSL 1.1.1c
OpenSSL 1.1.1d
DVE Score by Bitsight AI
DVE scores complement traditional static scoring systems like CVSS with Bitsight AI powered real-time threat intelligence and underground cyber criminal activity so that security teams can reduce alert fatigue and focus on vulnerabilities most likely to be exploited.
Low
More on DVE scores

CVE-2026-35189 Global Footprint

Top 10 Identified Countries

Country Observations Percentage
US 113,259 29.25%
JP 48,435 12.51%
DE 30,168 7.79%
NL 17,104 4.42%
CA 15,452 3.99%
KR 13,492 3.48%
FR 12,623 3.26%
CN 11,383 2.94%
GB 9,965 2.57%
IT 8,945 2.31%

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CVE-2026-35189 Industry Footprint

Top 10 Identified Industries

*Service provider organizations (typically Technology and Telecommunications) are disproportionally represented in the results given their upstream ownership of end-user infrastructure. See our FAQs.

Industry* Observations Percentage
Technology 203,096 75.26%
Telecommunications 41,204 15.27%
Education 11,945 4.43%
Business Services 3,248 1.20%
Government/Politics 3,206 1.19%
Retail 964 0.36%
Energy/Resources 826 0.31%
Media/Entertainment 691 0.26%
Manufacturing 674 0.25%
Utilities 616 0.23%

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