Vulnerability in Torproject Tor
CVE-2026-44597
Tor before 0.4.9.7 has an out-of-bounds read when an END, a TRUNCATE, or a TRUNCATED cell lacks a reason in its payload, aka TROVE-2026-011.
Published · last modified .
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:N/A:L.
EPSS exploit prediction
EPSS: 0.006 (49.2th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 49th percentile — 49.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.004 · newest: 0.006 · change: +0.002
Affected products
- Torproject Tor — versions 0
Weakness classification (CWE)
References
- forum.torproject.org/c/news/tor-release-announcement/28 (Release Notes)
- gitlab.torproject.org/tpo/core/tor/-/commit/8f98054b1982d00a14639864d03e9afd90b… (Patch)
- gitlab.torproject.org/tpo/core/tor/-/work_items/41254 (Broken Link)
- www.openwall.com/lists/oss-security/2026/05/06/8 (Mailing List, Third Party Advisory)
Frequently asked questions
- What is CVE-2026-44597?
- CVE-2026-44597 is a low-severity vulnerability in Torproject Tor, classified under CWE-684. CVSS score: 3.7/10. Published 2026-05-07.
- How severe is CVE-2026-44597?
- Low severity. CVSS v3 base score is 3.7 out of 10.