CVE catalog
CVE-2026-87724
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 s
- Severity
- Medium · CVSS 6.5
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:H - Published
- Updated
- Source
- [NVD] · [CVE record]
- EPSS
- 0.43% · Oct 25, 2026
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.
Vulnerable and fixed packages
Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.
| Distribution | Package | Release | Version | Status |
|---|---|---|---|---|
| Debian | tor | sid | 0.4.9.14-1 | fixed |
| Debian | tor | forky | 0.4.9.14-1 | fixed |
| Debian | tor | trixie | 0.4.9.11-0+deb13u1 | vulnerable |
| Debian | tor | trixie-security | 0.4.9.14-0+deb13u1 | fixed |
| Debian | tor | bookworm | 0.4.9.11-0+deb12u1 | vulnerable |
| Debian | tor | bookworm-security | 0.4.9.11-0+deb12u1 | vulnerable |
| Opensuse | tor | tumbleweed | 0.4.9.13-1.1 | fixed |
| Fedora | tor | 44 | 0:0.4.9.14-1.fc44 | fixed |
| Fedora | tor | 43 | 0:0.4.9.14-1.fc43 | fixed |
Fixed-version evidence
| Distribution | Package | Type | Release | Fixed version | Urgency | Origin | Bugs |
|---|---|---|---|---|---|---|---|
| Debian | tor | source | sid | 0.4.9.12-2 | not yet assigned | Not reported | Not reported |
| Debian | tor | source | forky | 0.4.9.12-2 | not yet assigned | Not reported | Not reported |
| Debian | tor | source | trixie | 0.4.9.12-0+deb13u2 | not yet assigned | Not reported | Not reported |
| Debian | tor | source | bookworm | (unfixed) | not yet assigned | Not reported | Not reported |
| Opensuse | tor | rpm | tumbleweed | 0.4.9.13-1.1 | Not reported | OPENSUSE-SU-2026:11909-1 | Not reported |
| Fedora | tor | rpm | 44 | 0:0.4.9.14-1.fc44 | Not reported | FEDORA-2026-F51AF3DB87#CVE-2026-87724 | Not reported |
| Fedora | tor | rpm | 43 | 0:0.4.9.14-1.fc43 | Not reported | FEDORA-2026-8A3E460F1E#CVE-2026-87724 | Not reported |
OpenFactory catalog packages
[Debian 12 (Bookworm)]
- [tor]Affected
Details (6)
0.4.9.11-0+deb12u1· amd64 · bookwormAffected
nvd · tor · debian · bookworm; nvd · tor · debian · 12
0.4.9.11-0+deb12u1· arm64 · bookwormAffected
nvd · tor · debian · bookworm; nvd · tor · debian · 12
0.4.8.14-1~bpo12+1· amd64 · bookworm-backportsAffected
nvd · tor · debian · bookworm; nvd · tor · debian · 12
0.4.8.14-1~bpo12+1· arm64 · bookworm-backportsAffected
nvd · tor · debian · bookworm; nvd · tor · debian · 12
0.4.9.11-0+deb12u1· amd64 · bookworm-securityAffected
nvd · tor · debian · bookworm; nvd · tor · debian · 12
0.4.9.11-0+deb12u1· arm64 · bookworm-securityAffected
nvd · tor · debian · bookworm; nvd · tor · debian · 12
- [tor-geoipdb]Affected
Source package: [tor]
Details (6)
0.4.9.11-0+deb12u1· all · bookwormAffected
nvd · tor · debian · bookworm; nvd · tor · debian · 12
0.4.9.11-0+deb12u1· all · bookwormAffected
nvd · tor · debian · bookworm; nvd · tor · debian · 12
0.4.8.14-1~bpo12+1· all · bookworm-backportsAffected
nvd · tor · debian · bookworm; nvd · tor · debian · 12
0.4.8.14-1~bpo12+1· all · bookworm-backportsAffected
nvd · tor · debian · bookworm; nvd · tor · debian · 12
0.4.9.11-0+deb12u1· all · bookworm-securityAffected
nvd · tor · debian · bookworm; nvd · tor · debian · 12
0.4.9.11-0+deb12u1· all · bookworm-securityAffected
nvd · tor · debian · bookworm; nvd · tor · debian · 12
[Debian 13 (Trixie)]
- [tor]Affected
Details (10)
0.4.9.11-0+deb13u1· amd64 · trixieAffected · Fixed:
0.4.9.12-0+deb13u2nvd · tor · debian · 13
0.4.9.11-0+deb13u1· arm64 · trixieAffected · Fixed:
0.4.9.12-0+deb13u2nvd · tor · debian · 13
0.4.9.11-1~bpo13+1· amd64 · trixie-backportsAffected · Fixed:
0.4.9.12-0+deb13u2nvd · tor · debian · 13
0.4.9.11-1~bpo13+1· arm64 · trixie-backportsAffected · Fixed:
0.4.9.12-0+deb13u2nvd · tor · debian · 13
0.4.9.11-0+deb13u1· amd64 · trixie-security · Historical versionAffected · Fixed:
0.4.9.12-0+deb13u2nvd · tor · debian · 13
0.4.9.11-0+deb13u1· arm64 · trixie-securityAffected · Fixed:
0.4.9.12-0+deb13u2nvd · tor · debian · 13
0.4.9.12-0+deb13u1· amd64 · trixie-security · Historical versionAffected · Fixed:
0.4.9.12-0+deb13u2nvd · tor · debian · 13
0.4.9.12-0+deb13u2· amd64 · trixie-security · Historical versionFixed · Fixed:
0.4.9.12-0+deb13u2nvd · tor · debian · 13
0.4.9.13-0+deb13u1· amd64 · trixie-security · Historical versionFixed · Fixed:
0.4.9.12-0+deb13u2nvd · tor · debian · 13
0.4.9.14-0+deb13u1· amd64 · trixie-securityFixed · Fixed:
0.4.9.12-0+deb13u2nvd · tor · debian · 13
- [tor-geoipdb]Affected
Source package: [tor]
Details (10)
0.4.9.11-0+deb13u1· all · trixieAffected · Fixed:
0.4.9.12-0+deb13u2nvd · tor · debian · 13
0.4.9.11-0+deb13u1· all · trixieAffected · Fixed:
0.4.9.12-0+deb13u2nvd · tor · debian · 13
0.4.9.11-1~bpo13+1· all · trixie-backportsAffected · Fixed:
0.4.9.12-0+deb13u2nvd · tor · debian · 13
0.4.9.11-1~bpo13+1· all · trixie-backportsAffected · Fixed:
0.4.9.12-0+deb13u2nvd · tor · debian · 13
0.4.9.11-0+deb13u1· all · trixie-security · Historical versionAffected · Fixed:
0.4.9.12-0+deb13u2nvd · tor · debian · 13
0.4.9.11-0+deb13u1· all · trixie-securityAffected · Fixed:
0.4.9.12-0+deb13u2nvd · tor · debian · 13
0.4.9.12-0+deb13u1· all · trixie-security · Historical versionAffected · Fixed:
0.4.9.12-0+deb13u2nvd · tor · debian · 13
0.4.9.12-0+deb13u2· all · trixie-security · Historical versionFixed · Fixed:
0.4.9.12-0+deb13u2nvd · tor · debian · 13
0.4.9.13-0+deb13u1· all · trixie-security · Historical versionFixed · Fixed:
0.4.9.12-0+deb13u2nvd · tor · debian · 13
0.4.9.14-0+deb13u1· all · trixie-securityFixed · Fixed:
0.4.9.12-0+deb13u2nvd · tor · debian · 13
[openSUSE Tumbleweed]
[Fedora 43]
- [tor]Unknown
Source package: [tor]
Details (4)
0.4.8.17-3.fc43· aarch64 · 43Unknown
Version impact unknown
nvd · tor · fedora · 43
0.4.8.17-3.fc43· x86_64 · 43Unknown
Version impact unknown
nvd · tor · fedora · 43
0.4.9.11-1.fc43· aarch64 · 43Unknown
Version impact unknown
nvd · tor · fedora · 43
0.4.9.11-1.fc43· x86_64 · 43Unknown
Version impact unknown
nvd · tor · fedora · 43
[Fedora 44]
- [tor]Unknown
Source package: [tor]
Details (4)
0.4.9.11-1.fc44· aarch64 · 44Unknown
Version impact unknown
nvd · tor · fedora · 44
0.4.9.11-1.fc44· x86_64 · 44Unknown
Version impact unknown
nvd · tor · fedora · 44
0.4.9.5-1.fc44· aarch64 · 44Unknown
Version impact unknown
nvd · tor · fedora · 44
0.4.9.5-1.fc44· x86_64 · 44Unknown
Version impact unknown
nvd · tor · fedora · 44
Observed:
References
- [https://bodhi.fedoraproject.org/updates/FEDORA-2026-8a3e460f1e]
- [https://bugzilla.redhat.com/show_bug.cgi?id=2521283]
- [https://bugzilla.redhat.com/show_bug.cgi?id=2521285]
- [https://bugzilla.redhat.com/show_bug.cgi?id=2521287]
- [https://bugzilla.redhat.com/show_bug.cgi?id=2521289]
- [https://bugzilla.redhat.com/show_bug.cgi?id=2521979]
- [https://bugzilla.redhat.com/show_bug.cgi?id=2529909]
- [https://bugzilla.redhat.com/show_bug.cgi?id=2530532]
- [https://ftp.suse.com/pub/projects/security/csaf/opensuse-su-2026_11909-1.json]
- [https://nvd.nist.gov/vuln/detail/CVE-2026-87724]
- [https://osv.dev/vulnerability/DEBIAN-CVE-2026-87724]
- [https://osv.dev/vulnerability/openSUSE-SU-2026:11909-1]
- [https://security-tracker.debian.org/tracker/CVE-2026-87724]
- [https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-87724.json]
- [https://wid.cert-bund.de/.well-known/csaf/white/2026/wid-sec-w-2026-3279.json]
[CERT-Bund public advisories] · [Debian Security Tracker] · [FIRST EPSS] · [Fedora security updates (Bodhi)] · [National Vulnerability Database (NVD)] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX] · [SUSE security advisories and VEX]