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Vulnerability · Published Jan 27, 2026 · Assigned by openssl

CVE-2025-15467Stack buffer overflow in CMS (Auth)EnvelopedData parsing

High 8.8

In plain English

A high-severity out-of-bounds write in OpenSSL from OpenSSL. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 74.8% (higher than 99.5% of all known vulnerabilities). Ready-made attack tooling exists: public proof-of-concept code. Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)8.8High
Exploit odds (30 days)74.8%top 0.5% of all CVEs
Exploited in the wildNo reportsCISA SSVC: poc
Attack tooling1Public PoC

Official description

Issue summary: Parsing CMS AuthEnvelopedData or EnvelopedData message with maliciously crafted AEAD parameters can trigger a stack buffer overflow. Impact summary: A stack buffer overflow may lead to a crash, causing Denial of Service, or potentially remote code execution. When parsing CMS (Auth)EnvelopedData structures that use AEAD ciphers such as AES-GCM, the IV (Initialization Vector) encoded in the ASN.1 parameters is copied into a fixed-size stack buffer without verifying that its length fits the destination. An attacker can supply a crafted CMS message with an oversized IV, causing a stack-based out-of-bounds write before any authentication or tag verification occurs. Applications and services that parse untrusted CMS or PKCS#7 content using AEAD ciphers (e.g., S/MIME (Auth)EnvelopedData with AES-GCM) are vulnerable. Because the overflow occurs prior to authentication, no valid key material is required to trigger it. While exploitability to remote code execution depends on platform and toolchain mitigations, the stack-based write primitive represents a severe risk. The FIPS modules in 3.6, 3.5, 3.4, 3.3 and 3.0 are not affected by this issue, as the CMS implementation is outside the OpenSSL FIPS module boundary. OpenSSL 3.6, 3.5, 3.4, 3.3 and 3.0 are vulnerable to this issue. OpenSSL 1.1.1 and 1.0.2 are not affected by this issue.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
AlmaLinux:10openssl1:3.5.1-7.el10_1.alma.1ALSA-2026:1472
AlmaLinux:9openssl1:3.5.1-7.el9_7ALSA-2026:1473
AlmaLinux:10openssl-devel1:3.5.1-7.el10_1.alma.1ALSA-2026:1472
AlmaLinux:9openssl-devel1:3.5.1-7.el9_7ALSA-2026:1473
AlmaLinux:10openssl-libs1:3.5.1-7.el10_1.alma.1ALSA-2026:1472
AlmaLinux:9openssl-libs1:3.5.1-7.el9_7ALSA-2026:1473
AlmaLinux:10openssl-perl1:3.5.1-7.el10_1.alma.1ALSA-2026:1472
AlmaLinux:9openssl-perl1:3.5.1-7.el9_7ALSA-2026:1473
Alpine:v3.20openssl3.3.6-r0ALPINE-CVE-2025-15467
Alpine:v3.21openssl3.3.6-r0ALPINE-CVE-2025-15467
Alpine:v3.22openssl3.5.5-r0ALPINE-CVE-2025-15467
Alpine:v3.23openssl3.5.5-r0ALPINE-CVE-2025-15467
Alpine:v3.24openssl3.5.5-r0ALPINE-CVE-2025-15467
Debian:12openssl3.0.18-1~deb12u2DSA-6113-1
Debian:12openssl3.0.18-1~deb12u2DEBIAN-CVE-2025-15467
Debian:13openssl3.5.4-1~deb13u2DSA-6113-1
Debian:13openssl3.5.4-1~deb13u2DEBIAN-CVE-2025-15467
Debian:14openssl3.5.5-1DEBIAN-CVE-2025-15467
Rocky Linux:10openssl1:3.5.1-7.el10_1RLSA-2026:1472
Rocky Linux:9openssl1:3.5.1-7.el9_7RLSA-2026:1473
Ubuntu:24.04:LTSedk2no fix listedUBUNTU-CVE-2025-15467
Ubuntu:25.10edk2no fix listedUBUNTU-CVE-2025-15467
Ubuntu:26.04:LTSedk2no fix listedUBUNTU-CVE-2025-15467
Ubuntu:26.10edk2no fix listedUBUNTU-CVE-2025-15467
Ubuntu:26.04:LTSedk2-hweno fix listedUBUNTU-CVE-2025-15467
Ubuntu:26.10edk2-hweno fix listedUBUNTU-CVE-2025-15467
Ubuntu:22.04:LTSopenssl3.0.2-0ubuntu1.21UBUNTU-CVE-2025-15467
Ubuntu:22.04:LTSopenssl3.0.2-0ubuntu1.21USN-7980-1
Ubuntu:24.04:LTSopenssl3.0.13-0ubuntu3.7UBUNTU-CVE-2025-15467
Ubuntu:24.04:LTSopenssl3.0.13-0ubuntu3.7USN-7980-1
Ubuntu:25.10openssl3.5.3-1ubuntu3USN-7980-1
Ubuntu:25.10openssl3.5.3-1ubuntu3UBUNTU-CVE-2025-15467
Ubuntu:26.04:LTSopenssl3.5.5-1ubuntu1UBUNTU-CVE-2025-15467

Affected products (as reported)

VendorProductVersions
OpenSSL OpenSSL 3.6.0 – before 3.6.13.5.0 – before 3.5.53.4.0 – before 3.4.43.3.0 – before 3.3.63.0.0 – before 3.0.19

Weakness: CWE-787, CWE-120 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

References