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9.1
CVE-2026-34182: OpenSSL may let attackers read or tamper with encrypted messages
CVE-2026-34182 · published 4 months ago
Summary
The OpenSSL libraries used in many Linux distributions can be tricked into accepting malformed encrypted messages, allowing an attacker to bypass integrity checks or obtain the same decryption capability as the recipient. This could let an on‑path attacker read or alter confidential data that was thought to be securely protected. Apply the latest OpenSSL security update for the affected packages (canonical/openssl, canonical/openssl-fips, canonical/edk2, bellsoft/openssl, debian/openssl) as soon as possible.
What to do
- Update canonical openssl to version 3.0.13-0ubuntu3.11.
- Update canonical openssl to version 3.5.3-1ubuntu3.4.
- Update canonical openssl to version 3.5.5-1ubuntu3.2.
- Update bellsoft openssl to version 3.5.7-r0.
- Update debian openssl to version 3.0.20-1~deb12u2.
- Update debian openssl to version 3.5.6-1~deb13u2.
- Update canonical openssl to version 3.0.2-0ubuntu1.25.
- Update bellsoft openssl to version 3.0.21-r0.
- Update alpine openssl to version 3.0.15-r00074.
- Update alpine rootio-openssl to version 3.0.15-r00074.
- Update alpine openssl to version 3.0.15-r00073.
- Update alpine rootio-openssl to version 3.0.15-r00073.
- Update canonical openssl to version 3.0.2-0ubuntu1.25+Fips1.
- Update canonical openssl-fips to version 3.0.13-0ubuntu3.12+Fips1.
- Update openssl to version 3.3.7-r1.
- Update openssl to version 3.5.7-r0.
- Update openssl to version 3.0.19-r00078.
- Update rootio-openssl to version 3.0.19-r00078.
- Update debian openssl to version 3.6.3-1.
Affected software
| Ecosystem | Vendor | Product | Affected versions |
|---|---|---|---|
| Ubuntu:Pro:FIPS-updates:22.04:LTS | canonical | openssl |
< 3.0.2-0ubuntu1.25+Fips1 Fix: upgrade to 3.0.2-0ubuntu1.25+Fips1
|
| Ubuntu:Pro:FIPS-updates:22.04:LTS | canonical | openssl-fips | All versions |
| Ubuntu:24.04:LTS | canonical | edk2 | All versions |
| Ubuntu:24.04:LTS | canonical | openssl |
< 3.0.13-0ubuntu3.11 Fix: upgrade to 3.0.13-0ubuntu3.11
|
| Ubuntu:Pro:FIPS-updates:24.04:LTS | canonical | openssl-fips |
< 3.0.13-0ubuntu3.12+Fips1 Fix: upgrade to 3.0.13-0ubuntu3.12+Fips1
|
| Ubuntu:25.10 | canonical | edk2 | All versions |
| Ubuntu:25.10 | canonical | openssl |
< 3.5.3-1ubuntu3.4 Fix: upgrade to 3.5.3-1ubuntu3.4
|
| Ubuntu:26.04:LTS | canonical | edk2 | All versions |
| Ubuntu:26.04:LTS | canonical | openssl |
< 3.5.5-1ubuntu3.2 Fix: upgrade to 3.5.5-1ubuntu3.2
|
| BellSoft Hardened Containers:stream | bellsoft | openssl |
>= 3.1.1-r1, < 3.5.7-r0 Fix: upgrade to 3.5.7-r0
|
| Debian:11 | debian | openssl | All versions |
| Debian:12 | debian | openssl |
< 3.0.20-1~deb12u2 Fix: upgrade to 3.0.20-1~deb12u2
|
| Debian:13 | debian | openssl |
< 3.5.6-1~deb13u2 Fix: upgrade to 3.5.6-1~deb13u2
|
| Debian:14 | debian | openssl |
< 3.6.3-1 Fix: upgrade to 3.6.3-1
|
| Ubuntu:22.04:LTS | canonical | openssl |
< 3.0.2-0ubuntu1.25 Fix: upgrade to 3.0.2-0ubuntu1.25
|
| Ubuntu:Pro:22.04:LTS | canonical | nodejs | All versions |
| Ubuntu:Pro:FIPS-preview:22.04:LTS | canonical | openssl | All versions |
| Ubuntu:Pro:FIPS-preview:22.04:LTS | canonical | openssl-fips | All versions |
| Alpaquita:23 | bellsoft | openssl |
>= 3.0.8-r4, < 3.0.21-r0 Fix: upgrade to 3.0.21-r0
|
| Alpaquita:25 | bellsoft | openssl |
>= 3.5.0-r0, < 3.5.7-r0 Fix: upgrade to 3.5.7-r0
|
| Alpaquita:stream | bellsoft | openssl |
>= 3.1.1-r1, < 3.5.7-r0 Fix: upgrade to 3.5.7-r0
|
| Root:Alpine:3.17 | alpine | openssl |
< 3.0.15-r00074 < 3.0.15-r00073 Fix: upgrade to 3.0.15-r00074
|
| Root:Alpine:3.17 | alpine | rootio-openssl |
< 3.0.15-r00074 < 3.0.15-r00073 Fix: upgrade to 3.0.15-r00074
|
| BellSoft Hardened Containers:23 | bellsoft | openssl |
>= 3.0.8-r4, < 3.0.21-r0 Fix: upgrade to 3.0.21-r0
|
| BellSoft Hardened Containers:25 | bellsoft | openssl |
>= 3.5.0-r0, < 3.5.7-r0 Fix: upgrade to 3.5.7-r0
|
| Ubuntu:26.04:LTS | canonical | edk2-hwe | All versions |
| Alpine:v3.21 | – | openssl |
>= 3.0.0, < 3.3.7-r1 Fix: upgrade to 3.3.7-r1
|
| Alpine:v3.22 | – | openssl |
>= 3.0.0, < 3.5.7-r0 Fix: upgrade to 3.5.7-r0
|
| Root:Alpine:3.17 | – | openssl |
< 3.0.19-r00078 Fix: upgrade to 3.0.19-r00078
|
| Root:Alpine:3.17 | – | rootio-openssl |
< 3.0.19-r00078 Fix: upgrade to 3.0.19-r00078
|
Original advisory text
CVE-2026-34182 in openssl - Patched by Root
Issue Summary: Cryptographic Message Services (CMS) processing fails to perform sufficient input validation on the cipher and tag length fields of AuthEnvelopedData containers, leading to various potential compromises. Impact Summary: Attackers making use of these vulnerabilities may achieve key-equivalent functionality for a given CMS recipient and/or bypass integrity validation for a given message. In one use case, an attacker may send a CMS message containing AuthEnvelopedData with the cipher specified as a non-AEAD cipher. OpenSSL erroneously allows this selection, and attempts to decrypt and validate the message. An on-path attacker who captures one legitimate AES-GCM AuthEnvelopedData addressed to the victim can re-emit it with the recipientInfos set left byte-for-byte intact, so the victim's private key still unwraps the genuine CEK (the content-encryption key), but with the inner OID rewritten to AES-256-OFB (Output Feedback Mode, an unauthenticated keystream mode) and with an attacker-chosen IV and ciphertext. The victim initializes AES-256-OFB under the real CEK, never consults the MAC field, and CMS_decrypt() returns success. If the application under attack responds to the attacker with any indicator showing success or failure of the decryption effort, it is possible for the attacker to use this as an oracle to obtain key equivalent functionality for the CEK used for the chosen recipient of the message. In another use case, an attacker can reduce the tag length of the chosen AEAD cipher for a given AuthEnvelopedData container to be a single byte long, allowing an attacker to brute force CMS decryption, producing an integrity bypass for applications that trust CMS_decrypt() to reject modified content. The FIPS modules are not affected by this issue.
References
- https://security-tracker.debian.org/tracker/CVE-2026-34182 Vendor Advisory
- https://ubuntu.com/security/CVE-2026-34182 Third Party Advisory
- https://ubuntu.com/security/notices/USN-8414-2 Vendor Advisory
- https://ubuntu.com/security/notices/USN-8414-1 Vendor Advisory
- https://docs.bell-sw.com/security/cves/CVE-2026-34182 Vendor Advisory
- https://openssl-library.org/news/secadv/20260609.txt Third Party Advisory
- https://github.com/openssl/openssl/commit/439ed7d2c0962ce964482727264668bf277c33... Patch
- https://github.com/openssl/openssl/commit/7947e6a81eb8776802f159fb6762cb7fcf7e34... Patch
- https://github.com/openssl/openssl/commit/d2ca86bcd43e4f17d899f347101766b6107676... Patch
- https://github.com/openssl/openssl/commit/03c1f4d45fb963aee7d5833390c507cd290182... Patch
- https://github.com/openssl/openssl/commit/9fd97f8cfdc2c0be214998de3b2b55c8edf6c7... Patch
- https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/34xxx/CVE-2026-34182... Vendor Advisory
- https://nvd.nist.gov/vuln/detail/CVE-2026-34182 Vendor Advisory
- https://www.cve.org/CVERecord?id=CVE-2026-34182 Third Party Advisory
- https://security.alpinelinux.org/vuln/CVE-2026-34182 Vendor Advisory
Internet-facing
14 days
Internal
60 days
- Not known to be exploited
- Can be exploited automatically
- Gives an attacker partial control
Type
CWE-354Improper Validation of Integrity Check Value
Timeline
Published9 Jun 2026
Updated7 Oct 2026
First seen9 Jun 2026
Sources
DEBIAN-CVE-2026-34182 · OSV
UBUNTU-CVE-2026-34182 · OSV
CVE-2026-34182 · NVD
BELL-CVE-2026-34182 · OSV
CVE-2026-34182 · OSV
ALPINE-CVE-2026-34182 · OSV
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