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Vulnerabilities

Vulnerability · CVE-2026-35189

Issue summary: A certificate with many nameRelativeToCRLIssuer CRL distribution points causes disproportionate heap growth when OpenSSL caches X.509 extensions.

Published Sep 29, 2026 · catalog updated Oct 26, 2026 · Issue summary: A certificate

Last checked Oct 26, 2026. A connected source was read within the last 7 days.

Check if you run it

No confirmed exploitation is on record for CVE-2026-35189. EPSS is 0.32%. Act only if a listed version of Issue summary: A certificate is installed.

Gaps on this record

  • The stored product name is a package slug. The name on this page is taken from the title (Issue summary: A certificate).
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
Medium5.3
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.32%
Remediation
Advisory link
Affected products
Debian:12 openssl · Debian:13 openssl · Debian:14 openssl

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.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • Debian:12 openssl0 → 3.0.22-1~deb12u2
  • Debian:13 openssl0 → 3.5.7-1~deb13u3
  • Debian:14 openssl0 → 3.6.5-1

How to fix CVE-2026-35189

  • Upgrade

    CVE-2026-35189 lists a fix boundary at 3.0.22-1~deb12u2. Compare the installed build with that boundary before you change production.

  • Version check

    Fixed in 3.0.22-1~deb12u2 · 2 other ranges on the advisory

  • Advisory

    Open the cve_org record and follow its fix.

  • Official advisories

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2026-35189. EPSS is 0.32%. Act only if a listed version of Issue summary: A certificate is installed.

Which versions are affected?

Compare what you have installed with 0 → 3.0.22-1~deb12u2, 0 → 3.5.7-1~deb13u3, 0 → 3.6.5-1. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

No weakness class is stored. EPSS 0.32%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Technology hubs

Debian security

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. Sep 29, 2026 · Trivy Vulnerability DB

    Detected

    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 W

  2. Oct 26, 2026 · Trivy Vulnerability DB

    Fix available

    openssl fixed in 3.0.22-1~deb12u2; openssl fixed in 3.5.7-1~deb13u3; openssl fixed in 3.6.5-1

  3. Oct 26, 2026 · Trivy Vulnerability DB

    Fix available

    openssl fixed in 3.0.22-1~deb12u2

  4. Oct 26, 2026 · Trivy Vulnerability DB

    Fix available

    openssl fixed in 3.5.7-1~deb13u3

  5. Oct 26, 2026 · Trivy Vulnerability DB

    Fix available

    openssl fixed in 3.6.5-1

  6. Oct 26, 2026 · Trivy Vulnerability DB

    Updated

    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 W

Sources

  • CVE.orgVulnerability recordCVE-2026-35189

    Official CVE identifier

    cve.org
  • Trivy Vulnerability DBPackage advisoryDEBIAN-CVE-2026-35189

    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 possi

    osv.dev

References

Freshness

Last verified in this catalog Oct 26, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.

  • CVE.orgOct 26, 2026
  • Trivy Vulnerability DBOct 26, 2026