Home / mailings [USN-8414-1] OpenSSL vulnerabilities
Posted on 09 June 2026
Ubuntu Security==========================================================================Ubuntu Security Notice USN-8414-1
June 09, 2026
openssl vulnerabilities
==========================================================================
A security issue affects these releases of Ubuntu and its derivatives:
- Ubuntu 26.04 LTS
- Ubuntu 25.10
- Ubuntu 24.04 LTS
- Ubuntu 22.04 LTS
Summary:
Several security issues were fixed in OpenSSL.
Software Description:
- openssl: Secure Socket Layer (SSL) cryptographic library and tools
Details:
Frank Buss discovered that OpenSSL had a heap buffer over-read in ASN.1
content parsing. An attacker could possibly use this issue to cause OpenSSL
to crash, resulting in a denial of service, or obtain sensitive
information. (CVE-2026-34180)
Pavol Zacik and Alex Gaynor discovered that OpenSSL incorrectly accepted
PKCS#12 files with short HMAC keys when using PBMAC1. An attacker could
possibly use this issue to bypass integrity checks. This issue only
affected Ubuntu 25.10 and Ubuntu 26.04 LTS. (CVE-2026-34181)
Asim Viladi Oglu Manizada and Alex Gaynor discovered that OpenSSL could
accept forged CMS AuthEnvelopedData messages. An attacker could possibly
use this issue to bypass message authentication checks. (CVE-2026-34182)
Abhinav Agarwal discovered that OpenSSL had unbounded memory growth in the
QUIC PATH_CHALLENGE handler. A remote attacker could possibly use this
issue to cause OpenSSL to use excessive resources, leading to a denial of
service. This issue only affected Ubuntu 25.10 and Ubuntu 26.04 LTS.
(CVE-2026-34183)
Sunwoo Lee, Hyuk Lim, and Seunghyun Yoon discovered that OpenSSL had a NULL
pointer dereference in QUIC server initial packet handling. A remote
attacker could possibly use this issue to cause OpenSSL to crash, resulting
in a denial of service. This issue only affected Ubuntu 25.10 and Ubuntu
26.04 LTS. (CVE-2026-42764)
Mayank Jangid, Kushal Khemka, Hari Priandana, Bhabani Sankar Das, and Qifan
Zhang discovered that OpenSSL had a possible NULL dereference in password-
based CMS decryption. An attacker could possibly use this issue to cause
OpenSSL to crash, resulting in a denial of service. (CVE-2026-42766)
Zhanpeng Liu, Guannan Wang, and Guancheng Li discovered that OpenSSL had a
NULL pointer dereference in CRMF EncryptedValue decryption. An attacker
could possibly use this issue to cause OpenSSL to crash, resulting in a
denial of service. (CVE-2026-42767)
Alex Gaynor discovered that OpenSSL had a Bleichenbacher oracle in
CMS_decrypt() and PKCS7_decrypt() with multiple RecipientInfo values. An
attacker could possibly use this issue to obtain sensitive information.
This issue only affected Ubuntu 25.10 and Ubuntu 26.04 LTS.
(CVE-2026-42768)
Alex Gaynor discovered that OpenSSL had a trust-anchor substitution issue
in CMP rootCaKeyUpdate processing. An attacker could possibly use this
issue to bypass certificate trust validation. This issue only affected
Ubuntu 25.10 and Ubuntu 26.04 LTS. (CVE-2026-42769)
Alex Gaynor discovered that OpenSSL used attacker-supplied parameters when
validating FFC-DH peers. An attacker could possibly use this issue to
weaken key validation and compromise security guarantees. (CVE-2026-42770)
Alex Gaynor discovered that OpenSSL could ignore the IV in AES-OCB mode on
the EVP_Cipher() path. An attacker could possibly use this issue to bypass
cryptographic protections and obtain sensitive information.
(CVE-2026-45445)
Alex Gaynor discovered that OpenSSL had incorrect tag processing for empty
messages in AES-GCM-SIV and AES-SIV modes. An attacker could possibly use
this issue to bypass cryptographic integrity checks. (CVE-2026-45446)
Thai Duong discovered that OpenSSL had a heap use-after-free in
PKCS7_verify(). An attacker could possibly use this issue to cause OpenSSL
to crash, resulting in a denial of service, or execute arbitrary code.
(CVE-2026-45447)
Zehua Qiao and Jinwen He discovered that OpenSSL had a possible heap buffer
overflow in ASN.1 multibyte string conversion. An attacker could possibly
use this issue to cause OpenSSL to crash, resulting in a denial of service,
or execute arbitrary code. (CVE-2026-7383)
Bhabani Sankar Das discovered that OpenSSL had an out-of-bounds read in CMS
password-based decryption. An attacker could possibly use this issue to
cause OpenSSL to crash, resulting in a denial of service. (CVE-2026-9076)
Update instructions:
The problem can be corrected by updating your system to the following
package versions:
Ubuntu 26.04 LTS
libssl3t64 3.5.5-1ubuntu3.2
openssl 3.5.5-1ubuntu3.2
Ubuntu 25.10
libssl3t64 3.5.3-1ubuntu3.4
openssl 3.5.3-1ubuntu3.4
Ubuntu 24.04 LTS
libssl3t64 3.0.13-0ubuntu3.11
openssl 3.0.13-0ubuntu3.11
Ubuntu 22.04 LTS
libssl3 3.0.2-0ubuntu1.25
openssl 3.0.2-0ubuntu1.25
After a standard system update you need to reboot your computer to make all
the necessary changes.
References:
https://ubuntu.com/security/notices/USN-8414-1
CVE-2026-34180, CVE-2026-34181, CVE-2026-34182, CVE-2026-34183,
CVE-2026-42764, CVE-2026-42766, CVE-2026-42767, CVE-2026-42768,
CVE-2026-42769, CVE-2026-42770, CVE-2026-45445, CVE-2026-45446,
CVE-2026-45447, CVE-2026-7383, CVE-2026-9076
Package Information:
https://launchpad.net/ubuntu/+source/openssl/3.5.5-1ubuntu3.2
https://launchpad.net/ubuntu/+source/openssl/3.5.3-1ubuntu3.4
https://launchpad.net/ubuntu/+source/openssl/3.0.13-0ubuntu3.11
https://launchpad.net/ubuntu/+source/openssl/3.0.2-0ubuntu1.25
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