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TI-2026-59885 Aliases CVE-2026-87724GHSA-c2x3-p37c-phvc

Tor before 0.4.9.12 interprets the CC_RESPONSE extension even when CC_REQUEST was not…

Priority LOW 29CWE-669Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
High
Impact type
—
Confidentiality · integrity · availability
None · Low · High
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA.

Summary

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00429 37th percentileScored 2026-11-07
Fix Fixed Tor (torprject): 0.4.9.12

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
torprjectTor0.4.9.3-alpha to before 0.4.9.120.4.9.12Patch availableCNA
  • Tor Vendortorprject Affected 0.4.9.3-alpha to before 0.4.9.12 Fixed in 0.4.9.12 Patch available CNA

Remediation

  • Fix · CNA Tor (torprject) Fixed in 0.4.9.12

Vendor assessments

Red Hat

Red Hat's page for this CVE →

Not affected: 1 product
  • Red Hat

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-87724
  2. 2026-10-03 Alias added: GHSA-c2x3-p37c-phvc

References

Other 2

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences