CVE catalog
CVE-2026-73500
etcd is a distributed key-value store for the data of a distributed system. Prior to versions 3.5.33, 3.6.14, and 3.7.1, a network attacker who can reach an etcd TLS listener can open many TCP connect
- Severity
- High · CVSS 8.7
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X - Published
- Source
- [NVD] · [CVE record]
- EPSS
- 0.70% · Oct 25, 2026
etcd is a distributed key-value store for the data of a distributed system. Prior to versions 3.5.33, 3.6.14, and 3.7.1, a network attacker who can reach an etcd TLS listener can open many TCP connections and never send a ClientHello. In client/pkg/transport/listener_tls.go, each connection handled by tlsListener.acceptLoop spawns a goroutine that blocks indefinitely inside tls.Conn.Handshake() and remains tracked in the pending map. Unbounded goroutine and map growth can exhaust memory in the etcd process, causing loss of availability for the cluster and, when etcd backs Kubernetes, the control plane. This issue is fixed in versions 3.5.33, 3.6.14, and 3.7.1.
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 | etcd | sid | 3.5.30-2 | vulnerable |
| Debian | etcd | forky | 3.5.30-2 | vulnerable |
| Debian | etcd | trixie | 3.5.16-4 | vulnerable |
| Debian | etcd | bookworm | 3.4.23-4 | vulnerable |
Fixed-version evidence
| Distribution | Package | Type | Release | Fixed version | Urgency | Origin | Bugs |
|---|---|---|---|---|---|---|---|
| Debian | etcd | source | sid | (unfixed) | not yet assigned | Not reported | [1144346] |
| Debian | etcd | source | forky | (unfixed) | not yet assigned | Not reported | [1144346] |
| Debian | etcd | source | trixie | (unfixed) | not yet assigned | Not reported | [1144346] |
| Debian | etcd | source | bookworm | (unfixed) | not yet assigned | Not reported | [1144346] |
Notes
[trixie] etcd: Minor issue [bookworm] etcd: Minor issue
OpenFactory catalog packages
[Debian 12 (Bookworm)]
- [etcd-client]Affected
Source package: [etcd]
Details (2)
3.4.23-4+b4· amd64 · bookwormAffected
nvd · etcd · debian · bookworm; nvd · etcd · debian · 12
3.4.23-4+b4· arm64 · bookwormAffected
nvd · etcd · debian · bookworm; nvd · etcd · debian · 12
- [etcd-server]Affected
Source package: [etcd]
Details (2)
3.4.23-4+b4· amd64 · bookwormAffected
nvd · etcd · debian · bookworm; nvd · etcd · debian · 12
3.4.23-4+b4· arm64 · bookwormAffected
nvd · etcd · debian · bookworm; nvd · etcd · debian · 12
- [golang-etcd-server-dev]Affected
Source package: [etcd]
Details (2)
3.4.23-4· all · bookwormAffected
nvd · etcd · debian · bookworm; nvd · etcd · debian · 12
3.4.23-4· all · bookwormAffected
nvd · etcd · debian · bookworm; nvd · etcd · debian · 12
[Debian 13 (Trixie)]
- [etcd-client]Affected
Source package: [etcd]
Details (2)
3.5.16-4· amd64 · trixieAffected
nvd · etcd · debian · 13
3.5.16-4· arm64 · trixieAffected
nvd · etcd · debian · 13
- [etcd-server]Affected
Source package: [etcd]
Details (2)
3.5.16-4· amd64 · trixieAffected
nvd · etcd · debian · 13
3.5.16-4· arm64 · trixieAffected
nvd · etcd · debian · 13
- [golang-etcd-server-dev]Affected
Source package: [etcd]
Details (2)
3.5.16-4· all · trixieAffected
nvd · etcd · debian · 13
3.5.16-4· all · trixieAffected
nvd · etcd · debian · 13
Observed:
References
- [https://github.com/etcd-io/etcd/commit/2e07efce9745004eb4773cffaada9b5cdf77cff2]
- [https://github.com/etcd-io/etcd/commit/89ff6d50796049d4f1136915ba21504b76e7e372]
- [https://github.com/etcd-io/etcd/commit/8e4dd0679a2c6b095d2a32a749fda2521c7809a3]
- [https://github.com/etcd-io/etcd/commit/f73cba7d920019f91a1ea1f6697833e42731f057]
- [https://github.com/etcd-io/etcd/pull/22130]
- [https://github.com/etcd-io/etcd/releases/tag/v3.5.33]
- [https://github.com/etcd-io/etcd/releases/tag/v3.6.14]
- [https://github.com/etcd-io/etcd/releases/tag/v3.7.1]
- [https://github.com/etcd-io/etcd/security/advisories/GHSA-6vch-q96h-7gc3]
- [https://nvd.nist.gov/vuln/detail/CVE-2026-73500]
- [https://osv.dev/vulnerability/DEBIAN-CVE-2026-73500]
- [https://security-tracker.debian.org/tracker/CVE-2026-73500]
- [https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-73500.json]
- [https://wid.cert-bund.de/.well-known/csaf/white/2026/wid-sec-w-2026-2825.json]
[CERT-Bund public advisories] · [Debian Security Tracker] · [FIRST EPSS] · [National Vulnerability Database (NVD)] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX]