CVE-Katalog

CVE-2026-63073

Issue summary: OpenSSL CMP response validation passed an unexpected response sender distinguished name directly as the format string to `ERR_raise_data()`. Impact summary: A malicious or intercepted

[CVE-Katalog]

Schweregrad: Critical · CVSS 9.8CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Published: Aug 25, 2026, 1:17:49 PM UTC
Updated: Aug 25, 2026, 1:19:26 PM UTC
Source: [NVD] · [CVE record]
EPSS: 1.16% · Oct 22, 2026

Issue summary: OpenSSL CMP response validation passed an unexpected response sender distinguished name directly as the format string to `ERR_raise_data()`. Impact summary: A malicious or intercepted CMP endpoint can crash a CMP client that enforces an expected sender or uses a pinned server certificate whose subject becomes the default expected sender. CWE: CWE-134 (Use of Externally-Controlled Format String) Description: When validating a received CMP message, ossl_cmp_msg_check_update() converts the peer-supplied sender distinguished name with X509_NAME_oneline() and passes it directly as the format argument to ERR_raise_data(). Percent characters survive the conversion, so a sender DN such as "CN=%s%n" reaches BIO_vsnprintf() as an attacker-controlled format string with no matching variadic arguments. This path is only reached when the caller configures an expected sender or pins a server certificate, which is the normal configuration for a CMP client validating server responses. Since the attacker controls the format string but none of the variadic arguments, such specifiers as %s and %n dereference or write through unrelated stack contents and crash the client. The reliable consequence is a denial of service, when the response comes from a malicious or intercepted CMP endpoint. There is no controlled memory write, arbitrary-address read, or reliable path to remote code execution. FIPS impact: no No FIPS modules are affected by this issue, as the CMP protocol implementation is outside 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`	fixed
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	`3.0.13-0ubuntu3.15`	fixed
Ubuntu	libssl-dev	noble	`3.0.13-0ubuntu3.15`	fixed
Ubuntu	libssl-doc	noble	`3.0.13-0ubuntu3.15`	fixed
Ubuntu	libssl3t64	noble	`3.0.13-0ubuntu3.15`	fixed
Cpe	openssl	Not reported	`4.0.2`	fixed
Alpine	openssl	3.21	`3.3.7-r1`	fixed
Alpine	openssl	3.22	`3.5.8-r0`	fixed
Alpine	openssl	3.23	`3.5.8-r0`	fixed
Alpine	openssl	3.24	`3.5.8-r0`	fixed

Fixed-version evidence

Distribution	Package	Type	Release	Fixed version	Urgency	Origin	Bugs
Debian	openssl	source	sid	`3.6.4-1`	not yet assigned	Not reported	Not reported
Debian	openssl	source	forky	`3.6.4-1`	not yet assigned	Not reported	Not reported
Debian	openssl	source	trixie	`3.5.7-1~deb13u2`	not yet assigned	Not reported	Not reported
Debian	openssl	source	bookworm	`Not affected`	unimportant	Not reported	Not reported
Ubuntu	openssl	deb	noble	`3.0.13-0ubuntu3.15`	Not reported	Not reported	Not reported
Ubuntu	libssl-dev	deb	noble	`3.0.13-0ubuntu3.15`	Not reported	Not reported	Not reported
Ubuntu	libssl-doc	deb	noble	`3.0.13-0ubuntu3.15`	Not reported	Not reported	Not reported
Ubuntu	libssl3t64	deb	noble	`3.0.13-0ubuntu3.15`	Not reported	Not reported	Not reported
Cpe	openssl	cpe	Not reported	`4.0.2`	Not reported	NVD-CVE-2026-63073	Not reported
Alpine	openssl	apk	3.21	`3.3.7-r1`	Not reported	ALPINE-CVE-2026-63073	Not reported
Alpine	openssl	apk	3.22	`3.5.8-r0`	Not reported	ALPINE-CVE-2026-63073	Not reported
Alpine	openssl	apk	3.23	`3.5.8-r0`	Not reported	ALPINE-CVE-2026-63073	Not reported
Alpine	openssl	apk	3.24	`3.5.8-r0`	Not reported	ALPINE-CVE-2026-63073	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~deb13u2
  nvd · openssl · debian · 13
- 3.5.6-1~deb13u2 · arm64 · trixie
  Betroffen · Behoben: 3.5.7-1~deb13u2
  nvd · openssl · debian · 13
- 3.5.6-1~deb13u2 · amd64 · trixie-security · Historical version
  Betroffen · Behoben: 3.5.7-1~deb13u2
  nvd · openssl · debian · 13
- 3.5.7-1~deb13u2 · amd64 · trixie-security · Historical version
  Behoben · Behoben: 3.5.7-1~deb13u2
  nvd · openssl · debian · 13
- 3.5.7-1~deb13u2 · arm64 · trixie-security
  Behoben · Behoben: 3.5.7-1~deb13u2
  nvd · openssl · debian · 13
- 3.5.7-1~deb13u3 · amd64 · trixie-security
  Behoben · Behoben: 3.5.7-1~deb13u2
  nvd · openssl · debian · 13
[libssl-dev]Betroffen
Quellpaket: [openssl]
Details (6)
- 3.5.6-1~deb13u2 · amd64 · trixie
  Betroffen · Behoben: 3.5.7-1~deb13u2
  nvd · openssl · debian · 13
- 3.5.6-1~deb13u2 · arm64 · trixie
  Betroffen · Behoben: 3.5.7-1~deb13u2
  nvd · openssl · debian · 13
- 3.5.6-1~deb13u2 · amd64 · trixie-security · Historical version
  Betroffen · Behoben: 3.5.7-1~deb13u2
  nvd · openssl · debian · 13
- 3.5.7-1~deb13u2 · amd64 · trixie-security · Historical version
  Behoben · Behoben: 3.5.7-1~deb13u2
  nvd · openssl · debian · 13
- 3.5.7-1~deb13u2 · arm64 · trixie-security
  Behoben · Behoben: 3.5.7-1~deb13u2
  nvd · openssl · debian · 13
- 3.5.7-1~deb13u3 · amd64 · trixie-security
  Behoben · Behoben: 3.5.7-1~deb13u2
  nvd · openssl · debian · 13
[libssl-doc]Betroffen
Quellpaket: [openssl]
Details (6)
- 3.5.6-1~deb13u2 · all · trixie
  Betroffen · Behoben: 3.5.7-1~deb13u2
  nvd · openssl · debian · 13
- 3.5.6-1~deb13u2 · all · trixie
  Betroffen · Behoben: 3.5.7-1~deb13u2
  nvd · openssl · debian · 13
- 3.5.6-1~deb13u2 · all · trixie-security · Historical version
  Betroffen · Behoben: 3.5.7-1~deb13u2
  nvd · openssl · debian · 13
- 3.5.7-1~deb13u2 · all · trixie-security
  Behoben · Behoben: 3.5.7-1~deb13u2
  nvd · openssl · debian · 13
- 3.5.7-1~deb13u2 · all · trixie-security · Historical version
  Behoben · Behoben: 3.5.7-1~deb13u2
  nvd · openssl · debian · 13
- 3.5.7-1~deb13u3 · all · trixie-security
  Behoben · Behoben: 3.5.7-1~deb13u2
  nvd · openssl · debian · 13
[openssl]Betroffen
Details (6)
- 3.5.6-1~deb13u2 · amd64 · trixie
  Betroffen · Behoben: 3.5.7-1~deb13u2
  nvd · openssl · debian · 13
- 3.5.6-1~deb13u2 · arm64 · trixie
  Betroffen · Behoben: 3.5.7-1~deb13u2
  nvd · openssl · debian · 13
- 3.5.6-1~deb13u2 · amd64 · trixie-security · Historical version
  Betroffen · Behoben: 3.5.7-1~deb13u2
  nvd · openssl · debian · 13
- 3.5.7-1~deb13u2 · amd64 · trixie-security · Historical version
  Behoben · Behoben: 3.5.7-1~deb13u2
  nvd · openssl · debian · 13
- 3.5.7-1~deb13u2 · arm64 · trixie-security
  Behoben · Behoben: 3.5.7-1~deb13u2
  nvd · openssl · debian · 13
- 3.5.7-1~deb13u3 · amd64 · trixie-security
  Behoben · Behoben: 3.5.7-1~deb13u2
  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~deb13u2
  nvd · openssl · debian · 13
- 3.5.6-1~deb13u2 · arm64 · trixie
  Betroffen · Behoben: 3.5.7-1~deb13u2
  nvd · openssl · debian · 13
- 3.5.6-1~deb13u2 · amd64 · trixie-security · Historical version
  Betroffen · Behoben: 3.5.7-1~deb13u2
  nvd · openssl · debian · 13
- 3.5.7-1~deb13u2 · amd64 · trixie-security · Historical version
  Behoben · Behoben: 3.5.7-1~deb13u2
  nvd · openssl · debian · 13
- 3.5.7-1~deb13u2 · arm64 · trixie-security
  Behoben · Behoben: 3.5.7-1~deb13u2
  nvd · openssl · debian · 13
- 3.5.7-1~deb13u3 · amd64 · trixie-security
  Behoben · Behoben: 3.5.7-1~deb13u2
  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~deb13u2
  nvd · openssl · debian · 13
- 3.5.6-1~deb13u2 · arm64 · trixie
  Betroffen · Behoben: 3.5.7-1~deb13u2
  nvd · openssl · debian · 13
- 3.5.6-1~deb13u2 · amd64 · trixie-security · Historical version
  Betroffen · Behoben: 3.5.7-1~deb13u2
  nvd · openssl · debian · 13
- 3.5.7-1~deb13u2 · amd64 · trixie-security · Historical version
  Behoben · Behoben: 3.5.7-1~deb13u2
  nvd · openssl · debian · 13
- 3.5.7-1~deb13u2 · arm64 · trixie-security
  Behoben · Behoben: 3.5.7-1~deb13u2
  nvd · openssl · debian · 13
- 3.5.7-1~deb13u3 · amd64 · trixie-security
  Behoben · Behoben: 3.5.7-1~deb13u2
  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, 4:16:19 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)]