CVE-2026-86145
Raw vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:LCVSS and EPSS are reproduced from their sources (NVD, FIRST EPSS). Risk Priority is our own derived reading, not an NVD score.
Summary
CVE-2026-86145 is a high-severity Improper Protection of Alternate Path (CWE-424) vulnerability. Its CVSS base score is 8.2 (High).
Operationally, ranked at the 32th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog.
The strongest mitigations our analysis identified map to AC-24 (Access Control Decisions) and AC-25 (Reference Monitor) — see the control section below for these in your framework.
OWASP Top 10 for Web (2025)
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2026-71836
Vulnerability Data
PCRE2 before 10.48 allows a pcre2_dfa_match out-of-bounds write because reuse of a cached workspace block, in a recursive DFA matching workspace, lacks a size check (even though a newly allocated block, for the same purpose, does have a size check).…
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This outcome requires an attacker-controlled regular expression, or a recursive pattern in conjunction with a small heap limit (this can be set through the API).
- CWE(s)
Related Threats
CVEs Like This One
Affected Assets
Mitigating Controls
Mitigating Controls (NIST 800-53 r5) AI
Requiring access-control decisions to be applied to each request ensures no alternate path can bypass authorization checks.
A reference monitor that is always invoked by definition covers every possible path, eliminating the root cause of unprotected alternate paths.
Enforcing approved authorizations for every logical access request structurally blocks unprotected alternate paths to restricted resources.
Mitigating Controls (ISO/IEC 27001:2022 Annex A) AI
Derived directly from the weakness types (CWEs) cited in the NVD entry via our AI-authored CWE→ISO cross-walk (authority under review) — links open the control.
Access control policy directly requires protection of all entry points to restricted functionality.
Managing access rights must cover every alternate path that could bypass intended restrictions.
Privileged access rights must be enforced on every possible route to privileged functions.
Secure development lifecycle includes design reviews that should identify and close alternate paths.
A.8.27 mandates security-by-design, defence-in-depth, least privilege, default-deny, fail-securely, distrust-external-input, assume-breach and zero-trust principles plus explicit design reviews against known attack patterns; these directly close most alternate-path bypasses (e.g. by enforcing consistent authorization on every path), leaving only the bounded remainder of paths that arise from incomplete requirements or post-design code changes.
Secure coding practices reduce the likelihood of unprotected alternate paths in source code.
Hardening callouts derived
DISA STIG baselines are authored against specific weaknesses. Where this CVE cites a broad weakness class, the mapping is not asserted at that abstraction (owner ruling, 2026-09-25: grade only at Base and below), so no rule is shown here rather than a rule shown against the wrong grain.
- No fine-grained STIG row for CWE-424, a class-level weakness, and none of its children carries one either.