CVE-Katalog

CVE-2026-84784

Issue summary: A malicious remote peer may flood the local QUIC stack with NEW_CONNECTION_ID frames by avoiding a limit check on how many connection IDs the remote QUIC stack can use. Impact summary:

[CVE-Katalog]

Schweregrad: High · CVSS 8.2CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H
Published: Sep 29, 2026, 4:17:07 PM UTC
Updated: Sep 29, 2026, 4:17:12 PM UTC
Source: [NVD] · [CVE record]
EPSS: 0.40% · Oct 22, 2026

Issue summary: A malicious remote peer may flood the local QUIC stack with NEW_CONNECTION_ID frames by avoiding a limit check on how many connection IDs the remote QUIC stack can use. Impact summary: The local QUIC stack sends a RETIRE_CONN_ID frame for every NEW_CONNECTION_ID frame it receives. The RETIRE_CONN_ID frame is dispatched via the Control Frame Queue (CFQ). If the remote peer also withholds ACKs, then it can force the local stack to allocate ~400MB (depending on ACK delay). CWE: CWE-770: Allocation of Resources Without Limits or Throttling Description: RFC 9000 sections 5.1.1 and 5.1.2 [1] describe the mechanism by which a remote peer can notify the local QUIC stack to change the destination connection ID (a.k.a. CID) the local stack uses to identify the connection at the remote peer. Each CID is associated with a sequence number. The sequence number is transmitted in NEW_CONNECTION_ID and RETIRE_CONNECTION_ID frames to identify the CID which is being either associated with a connection or retired. The remote peer sends a NEW_CONNECTION_ID frame to let the local stack know a new CID is being associated with an existing connection. The NEW_CONNECTION_ID frame carries the new CID, its sequence number, and the retire-prior-to number. The retire-prior-to identifies existing CIDs that are to be retired. The local QUIC stack must send a RETIRE_CONNECTION_ID for every destination CID whose sequence number is less than retire-prior-to. The CID becomes retired after the local stack receives an ACK for its RETIRE_CONNECTION_ID frame. Although the OpenSSL QUIC stack supports at most one destination CID for every connection, it can be tricked into processing more than one RETIRE_CONNECTION_ID frame per connection. The OpenSSL QUIC stack currently retires the destination CID as soon as it receives the NEW_CONNECTION_ID, while in fact the destination CID must be retired after an ACK for the RETIRE_CONNECTION_ID frame is received. Correcting the flawed logic also fixes the backlog growth. [1] https://datatracker.ietf.org/doc/html/rfc9000#name-issuing-connection-ids FIPS impact: no The FIPS module is not affected as the QUIC implementation is outside of the OpenSSL FIPS module boundary.

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	openssl	sid	`3.6.5-1`	fixed
Debian	openssl	forky	`3.6.5-1`	fixed
Debian	openssl	trixie	`3.5.7-1~deb13u2`	vulnerable
Debian	openssl	trixie-security	`3.5.7-1~deb13u3`	fixed
Debian	openssl	bookworm	`3.0.20-1~deb12u2`	not affected
Debian	openssl	bookworm-security	`3.0.22-1~deb12u1`	not affected
Ubuntu	openssl	noble	`3.0.13-0ubuntu3.16`	fixed
Ubuntu	libssl-dev	noble	`3.0.13-0ubuntu3.16`	fixed
Ubuntu	libssl-doc	noble	`3.0.13-0ubuntu3.16`	fixed
Ubuntu	libssl3t64	noble	`3.0.13-0ubuntu3.16`	fixed
Cpe	openssl	Not reported	`4.0.3`	fixed
Alpine	openssl	3.21	`3.3.7-r2`	fixed

Fixed-version evidence

Distribution	Package	Type	Release	Fixed version	Urgency	Origin	Bugs
Debian	openssl	source	sid	`3.6.5-1`	not yet assigned	Not reported	Not reported
Debian	openssl	source	forky	`3.6.5-1`	not yet assigned	Not reported	Not reported
Debian	openssl	source	trixie	`3.5.7-1~deb13u3`	not yet assigned	Not reported	Not reported
Debian	openssl	source	bookworm	`Not affected`	unimportant	Not reported	Not reported
Ubuntu	openssl	deb	noble	`3.0.13-0ubuntu3.16`	Not reported	Not reported	Not reported
Ubuntu	libssl-dev	deb	noble	`3.0.13-0ubuntu3.16`	Not reported	Not reported	Not reported
Ubuntu	libssl-doc	deb	noble	`3.0.13-0ubuntu3.16`	Not reported	Not reported	Not reported
Ubuntu	libssl3t64	deb	noble	`3.0.13-0ubuntu3.16`	Not reported	Not reported	Not reported
Cpe	openssl	cpe	Not reported	`4.0.3`	Not reported	NVD-CVE-2026-84784	Not reported
Alpine	openssl	apk	3.21	`3.3.7-r2`	Not reported	ALPINE-CVE-2026-84784	Not reported

OpenFactory catalog packages

[Debian 13 (Trixie)]

[libssl3t64]Betroffen
Quellpaket: [openssl]
Details (6)
- 3.5.6-1~deb13u2 · amd64 · trixie
  Betroffen · Behoben: 3.5.7-1~deb13u3
  nvd · openssl · debian · 13
- 3.5.6-1~deb13u2 · arm64 · trixie
  Betroffen · Behoben: 3.5.7-1~deb13u3
  nvd · openssl · debian · 13
- 3.5.6-1~deb13u2 · amd64 · trixie-security · Historical version
  Betroffen · Behoben: 3.5.7-1~deb13u3
  nvd · openssl · debian · 13
- 3.5.7-1~deb13u2 · amd64 · trixie-security · Historical version
  Betroffen · Behoben: 3.5.7-1~deb13u3
  nvd · openssl · debian · 13
- 3.5.7-1~deb13u2 · arm64 · trixie-security
  Betroffen · Behoben: 3.5.7-1~deb13u3
  nvd · openssl · debian · 13
- 3.5.7-1~deb13u3 · amd64 · trixie-security
  Behoben · Behoben: 3.5.7-1~deb13u3
  nvd · openssl · debian · 13
[libssl-dev]Betroffen
Quellpaket: [openssl]
Details (6)
- 3.5.6-1~deb13u2 · amd64 · trixie
  Betroffen · Behoben: 3.5.7-1~deb13u3
  nvd · openssl · debian · 13
- 3.5.6-1~deb13u2 · arm64 · trixie
  Betroffen · Behoben: 3.5.7-1~deb13u3
  nvd · openssl · debian · 13
- 3.5.6-1~deb13u2 · amd64 · trixie-security · Historical version
  Betroffen · Behoben: 3.5.7-1~deb13u3
  nvd · openssl · debian · 13
- 3.5.7-1~deb13u2 · amd64 · trixie-security · Historical version
  Betroffen · Behoben: 3.5.7-1~deb13u3
  nvd · openssl · debian · 13
- 3.5.7-1~deb13u2 · arm64 · trixie-security
  Betroffen · Behoben: 3.5.7-1~deb13u3
  nvd · openssl · debian · 13
- 3.5.7-1~deb13u3 · amd64 · trixie-security
  Behoben · Behoben: 3.5.7-1~deb13u3
  nvd · openssl · debian · 13
[libssl-doc]Betroffen
Quellpaket: [openssl]
Details (6)
- 3.5.6-1~deb13u2 · all · trixie
  Betroffen · Behoben: 3.5.7-1~deb13u3
  nvd · openssl · debian · 13
- 3.5.6-1~deb13u2 · all · trixie
  Betroffen · Behoben: 3.5.7-1~deb13u3
  nvd · openssl · debian · 13
- 3.5.6-1~deb13u2 · all · trixie-security · Historical version
  Betroffen · Behoben: 3.5.7-1~deb13u3
  nvd · openssl · debian · 13
- 3.5.7-1~deb13u2 · all · trixie-security · Historical version
  Betroffen · Behoben: 3.5.7-1~deb13u3
  nvd · openssl · debian · 13
- 3.5.7-1~deb13u2 · all · trixie-security
  Betroffen · Behoben: 3.5.7-1~deb13u3
  nvd · openssl · debian · 13
- 3.5.7-1~deb13u3 · all · trixie-security
  Behoben · Behoben: 3.5.7-1~deb13u3
  nvd · openssl · debian · 13
[openssl]Betroffen
Details (6)
- 3.5.6-1~deb13u2 · amd64 · trixie
  Betroffen · Behoben: 3.5.7-1~deb13u3
  nvd · openssl · debian · 13
- 3.5.6-1~deb13u2 · arm64 · trixie
  Betroffen · Behoben: 3.5.7-1~deb13u3
  nvd · openssl · debian · 13
- 3.5.6-1~deb13u2 · amd64 · trixie-security · Historical version
  Betroffen · Behoben: 3.5.7-1~deb13u3
  nvd · openssl · debian · 13
- 3.5.7-1~deb13u2 · amd64 · trixie-security · Historical version
  Betroffen · Behoben: 3.5.7-1~deb13u3
  nvd · openssl · debian · 13
- 3.5.7-1~deb13u2 · arm64 · trixie-security
  Betroffen · Behoben: 3.5.7-1~deb13u3
  nvd · openssl · debian · 13
- 3.5.7-1~deb13u3 · amd64 · trixie-security
  Behoben · Behoben: 3.5.7-1~deb13u3
  nvd · openssl · debian · 13
[openssl-provider-fips]Betroffen
Quellpaket: [openssl]
Details (6)
- 3.5.6-1~deb13u2 · amd64 · trixie
  Betroffen · Behoben: 3.5.7-1~deb13u3
  nvd · openssl · debian · 13
- 3.5.6-1~deb13u2 · arm64 · trixie
  Betroffen · Behoben: 3.5.7-1~deb13u3
  nvd · openssl · debian · 13
- 3.5.6-1~deb13u2 · amd64 · trixie-security · Historical version
  Betroffen · Behoben: 3.5.7-1~deb13u3
  nvd · openssl · debian · 13
- 3.5.7-1~deb13u2 · amd64 · trixie-security · Historical version
  Betroffen · Behoben: 3.5.7-1~deb13u3
  nvd · openssl · debian · 13
- 3.5.7-1~deb13u2 · arm64 · trixie-security
  Betroffen · Behoben: 3.5.7-1~deb13u3
  nvd · openssl · debian · 13
- 3.5.7-1~deb13u3 · amd64 · trixie-security
  Behoben · Behoben: 3.5.7-1~deb13u3
  nvd · openssl · debian · 13
[openssl-provider-legacy]Betroffen
Quellpaket: [openssl]
Details (6)
- 3.5.6-1~deb13u2 · amd64 · trixie
  Betroffen · Behoben: 3.5.7-1~deb13u3
  nvd · openssl · debian · 13
- 3.5.6-1~deb13u2 · arm64 · trixie
  Betroffen · Behoben: 3.5.7-1~deb13u3
  nvd · openssl · debian · 13
- 3.5.6-1~deb13u2 · amd64 · trixie-security · Historical version
  Betroffen · Behoben: 3.5.7-1~deb13u3
  nvd · openssl · debian · 13
- 3.5.7-1~deb13u2 · amd64 · trixie-security · Historical version
  Betroffen · Behoben: 3.5.7-1~deb13u3
  nvd · openssl · debian · 13
- 3.5.7-1~deb13u2 · arm64 · trixie-security
  Betroffen · Behoben: 3.5.7-1~deb13u3
  nvd · openssl · debian · 13
- 3.5.7-1~deb13u3 · amd64 · trixie-security
  Behoben · Behoben: 3.5.7-1~deb13u3
  nvd · openssl · debian · 13

[Debian 12 (Bookworm)]

[libssl3]Nicht betroffen
Quellpaket: [openssl]
Details (6)
- 3.0.20-1~deb12u2 · amd64 · bookworm
  Nicht betroffen
  nvd · openssl · debian · bookworm
- 3.0.20-1~deb12u2 · arm64 · bookworm
  Nicht betroffen
  nvd · openssl · debian · bookworm
- 3.0.20-1~deb12u2 · amd64 · bookworm-security
  Nicht betroffen
  nvd · openssl · debian · bookworm
- 3.0.20-1~deb12u2 · arm64 · bookworm-security
  Nicht betroffen
  nvd · openssl · debian · bookworm
- 3.0.17-1~deb12u2 · amd64 · bookworm-updates
  Nicht betroffen
  nvd · openssl · debian · bookworm
- 3.0.17-1~deb12u2 · arm64 · bookworm-updates
  Nicht betroffen
  nvd · openssl · debian · bookworm
[libssl-dev]Nicht betroffen
Quellpaket: [openssl]
Details (6)
- 3.0.20-1~deb12u2 · amd64 · bookworm
  Nicht betroffen
  nvd · openssl · debian · bookworm
- 3.0.20-1~deb12u2 · arm64 · bookworm
  Nicht betroffen
  nvd · openssl · debian · bookworm
- 3.0.20-1~deb12u2 · amd64 · bookworm-security
  Nicht betroffen
  nvd · openssl · debian · bookworm
- 3.0.20-1~deb12u2 · arm64 · bookworm-security
  Nicht betroffen
  nvd · openssl · debian · bookworm
- 3.0.17-1~deb12u2 · amd64 · bookworm-updates
  Nicht betroffen
  nvd · openssl · debian · bookworm
- 3.0.17-1~deb12u2 · arm64 · bookworm-updates
  Nicht betroffen
  nvd · openssl · debian · bookworm
[libssl-doc]Nicht betroffen
Quellpaket: [openssl]
Details (6)
- 3.0.20-1~deb12u2 · all · bookworm
  Nicht betroffen
  nvd · openssl · debian · bookworm
- 3.0.20-1~deb12u2 · all · bookworm
  Nicht betroffen
  nvd · openssl · debian · bookworm
- 3.0.20-1~deb12u2 · all · bookworm-security
  Nicht betroffen
  nvd · openssl · debian · bookworm
- 3.0.20-1~deb12u2 · all · bookworm-security
  Nicht betroffen
  nvd · openssl · debian · bookworm
- 3.0.17-1~deb12u2 · all · bookworm-updates
  Nicht betroffen
  nvd · openssl · debian · bookworm
- 3.0.17-1~deb12u2 · all · bookworm-updates
  Nicht betroffen
  nvd · openssl · debian · bookworm
[openssl]Nicht betroffen
Details (6)
- 3.0.20-1~deb12u2 · amd64 · bookworm
  Nicht betroffen
  nvd · openssl · debian · bookworm
- 3.0.20-1~deb12u2 · arm64 · bookworm
  Nicht betroffen
  nvd · openssl · debian · bookworm
- 3.0.20-1~deb12u2 · amd64 · bookworm-security
  Nicht betroffen
  nvd · openssl · debian · bookworm
- 3.0.20-1~deb12u2 · arm64 · bookworm-security
  Nicht betroffen
  nvd · openssl · debian · bookworm
- 3.0.17-1~deb12u2 · amd64 · bookworm-updates
  Nicht betroffen
  nvd · openssl · debian · bookworm
- 3.0.17-1~deb12u2 · arm64 · bookworm-updates
  Nicht betroffen
  nvd · openssl · debian · bookworm

Beobachtet: Oct 24, 2026, 2:46:55 AM UTC

Referenzen

[CERT-Bund public advisories] · [Debian Security Tracker] · [FIRST EPSS] · [National Vulnerability Database (NVD)] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX] · [SUSE security advisories and VEX] · [Ubuntu Security Notices (USN)]