What is CVE-2026-44599?

CVE-2026-44599 is a low-severity vulnerability in Torproject Tor, classified under Incorrect Resource Transfer Between Spheres. CVSS score: 3.7/10. Published 2026-05-07.

How severe is CVE-2026-44599?

Low severity. CVSS v3 base score is 3.7 out of 10.

Vulnerability in Torproject Tor

CVE-2026-44599

Tor before 0.4.9.7 can attempt or accept BEGIN_DIR via conflux legs, aka TROVE-2026-008.

Published 2026-05-07 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 3.7 (Low). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N.

EPSS exploit prediction

EPSS: 0.004 (32.4th percentile), scored 2026-10-19.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 32nd percentile — 32.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.003 · newest: 0.004 · change: +0.001

Affected products

Torproject Tor — versions 0

Weakness classification (CWE)

CWE-669 — Incorrect Resource Transfer Between Spheres

References

forum.torproject.org/c/news/tor-release-announcement/28 (Release Notes)
www.openwall.com/lists/oss-security/2026/05/06/8 (Mailing List, Third Party Advisory)
gitlab.torproject.org/tpo/core/tor/-/work_items/41243 (Broken Link)
gitlab.torproject.org/tpo/core/tor/-/commit/50f90ba849088247734786922855c22661c… (Patch)

Frequently asked questions

What is CVE-2026-44599?: CVE-2026-44599 is a low-severity vulnerability in Torproject Tor, classified under Incorrect Resource Transfer Between Spheres. CVSS score: 3.7/10. Published 2026-05-07.
How severe is CVE-2026-44599?: Low severity. CVSS v3 base score is 3.7 out of 10.