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CVE-2026-59251: Denial of service via exponential certificate policy tree growth in path validation

CVE-2026-59251 is a vulnerability in Denial of service via exponential certificate policy tree growth in path validation, rated Important by Microsoft. Microsoft has not reported exploitation in the wild. The EPSS model estimates a 0.34% probability of exploitation activity in the next 30 days, higher than 28% of all scored vulnerabilities. Microsoft released the fix on 6 August 2026, outside Patch Tuesday. It affects 1 product in 1 product family (Open Source Software).

Key facts

CVE ID
CVE-2026-59251
Severity
N/A
Microsoft severity
Important
Exploited in the wild
No
Publicly disclosed
No
Weakness
CWE-770
EPSS
0.34% (percentile 28%)
CISA KEV
Not listed
Released
Last updated
Patch Tuesday
July 2026 Patch Tuesday
Product families
Open Source Software

Affected products (1)

Open Source Software

ProductSecurity updateTypeFixed buildRestart
azl3 erlang 26.2.5.21-4 on Azure Linux 3.0CBL-Mariner ReleasesSecurity Update26.2.5.21-3No

NIST NVD data

NVD status
Analyzed
NVD CVSS
7.5 (HIGH)
NVD weakness
CWE-770
Published to NVD
NVD last modified

Affected configurations (CPE)

ProductVulnerable versions
erlang\/otpfrom 26.2, before 27.3.4.15
erlang\/otpfrom 28.0, before 28.5.0.4
erlang\/otpfrom 29.0, before 29.0.4
erlang\/public keyfrom 1.15, before 1.17.1.5
erlang\/public keyfrom 1.18, before 1.20.3.4
erlang\/public keyfrom 1.21, before 1.21.4

References

Revision history

VersionDateDescription
1.0Information published.

Sources