CVE-2026-44599
Torproject Tor ≤ 0.4.9.7
Raw vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:NCVSS and EPSS are reproduced from their sources (NVD, FIRST EPSS). Risk Priority is our own derived reading, not an NVD score.
Summary
CVE-2026-44599 is a low-severity Incorrect Resource Transfer Between Spheres (CWE-669) vulnerability in Torproject Tor. Its CVSS base score is 3.7 (Low).
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-4 (Information Flow Enforcement) and SC-4 (Information in Shared System Resources) — see the control section below for these in your framework.
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2026-28238
Vulnerability Data
Tor before 0.4.9.7 can attempt or accept BEGIN_DIR via conflux legs, aka TROVE-2026-008.
- CWE(s)
Related Threats
CVEs Like This One
Affected Assets
Mitigating Controls
Mitigating Controls (NIST 800-53 r5) AI
Enforces approved information flow authorizations between system components and connected systems, directly stopping improper resource transfers across spheres.
Prevents unintended information leakage through shared system resources when crossing sphere boundaries.
Monitors and controls communications at external and key internal boundaries to block unauthorized transfers between trust domains.
Enforces logical access authorizations that limit resource transfers to only approved sphere crossings.
Separates user functionality from system management functions to avoid improper resource or behavior transfer between privilege spheres.
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.
Information-transfer rules can prevent improper resource hand-off between spheres.
Access-control policies limit unintended control over transferred resources.
Managing access rights reduces risk of unauthorized resource transfer.
Network-security controls can block improper cross-sphere transfers.
Network segregation directly limits unintended resource movement between spheres.
Secure SDLC practices can catch incorrect resource-transfer flaws early.
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.