CVE-2026-44597: torproject tor
CVSS: 9.1v3.1CriticalAnalyzed
AliasesUBUNTU-CVE-2026-44597DEBIAN-CVE-2026-44597
Published 07-05-2026Last modified 07-05-2026
Vulnerability summary
CVE-2026-44597 is a critical (CVSS 9.1) vulnerability in torproject tor. EPSS estimates a 0.63% chance of exploitation in the next 30 days, higher than 49.2% of scored vulnerabilities.
CVSS score
9.1/10
010
Critical · v3.1 (NVD)EPSS score
0.63%
0%100%
Low · +0.18 pp in 30 daysKEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded
Advisory lineage
Upstream 0 · Downstream 2 · Related 1Timeline
- 07-05-2026PublishedVulnerability first disclosed.
- 07-05-2026Last modifiedVulnerability information updated.
Description
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.
CVSS metrics
4 scores · 4 sources · 1 versionCritical 9.1Preferred score · NVD (NIST)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:HSources4 sources · 3.7–9.1
- CVE.orgCNA3.7LowCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:LDiffers
- OSV · UbuntuEcosystem advisory · calculated9.1CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
- OSV · DebianEcosystem advisory · calculated9.1CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
EPSS trend
Probability
0.63%
Chance of exploitation in the next 30 days
Percentile
49%
Versus all other CVEs
30-day change
+0.18 pp
From 0.45% on 19-09-2026
19-09-202619-10-2026
EPSS score0.63%
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Debian1 product
- tor< 0.4.9.8-0+deb12u1 | < 0.4.9.8-0+deb13u1 | < 0.4.9.8-1
Torproject1 product
- tor< 0.4.9.7
Ubuntu1 product
- torAll versions (No fix recorded)
3 vendors · 3 products
