6.5

CVE-2026-87724: torprject tor

CVSS: 6.5v3.1MediumDeferred
AliasesMGASA-2026-0392UBUNTU-CVE-2026-87724DEBIAN-CVE-2026-87724
Published 09-09-2026Last modified 09-09-2026
Open JSON

Vulnerability summary

CVE-2026-87724 is a medium (CVSS 6.5) vulnerability in torprject tor. EPSS estimates a 0.43% chance of exploitation in the next 30 days, higher than 35.7% of scored vulnerabilities.

Overall risk
26/100
0100
Medium · default modelHow is this calculated?
CVSS score
6.5/10
010
Medium · v3.1 (CVE.org)
EPSS score
0.43%
0%100%
Low · +0.17 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Timeline

  1. 09-09-2026
    PublishedVulnerability first disclosed.
  2. 09-09-2026
    Last modifiedVulnerability information updated.

Description

Tor before 0.4.9.12 interprets the CC_RESPONSE extension even when CC_REQUEST was not sent, which allows remote attackers to cause a denial of service (crash) because of corrupted congestion-control state. This is TROVE-2026-032.

CVSS metrics

4 scores · 4 sources · 1 version

EPSS trend

Probability

0.43%

Chance of exploitation in the next 30 days

Percentile

36%

Versus all other CVEs

30-day change

+0.17 pp

From 0.26% on 19-09-2026

19-09-202619-10-2026
EPSS score
0.43%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Mageia2 products
  • tor< 0.4.9.12-1.mga10
  • tor< 0.4.9.12-1.mga9
Debian1 product
  • torAll versions (No fix recorded) | < 0.4.9.12-0+deb13u2 | < 0.4.9.12-2
Opensuse1 product
  • tor&distro=openSUSE Tumbleweed< 0.4.9.13-1.1
Torprject1 product
  • tor≥ 0.4.9.3-alpha, < 0.4.9.12
Ubuntu1 product
  • torAll versions (No fix recorded)

5 vendors · 6 products

References

11 links
Show all 11 references