CMS AuthEnvelopedData Processing May Accept Forged Messages
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- —
- Confidentiality · integrity · availability
- High · High · None
- Fix status
- Fixed
Attack profile from CVSS 3.1 · CISA ADP. Fix status from CNA and Red Hat.
Summary
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.
Why it matters now
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- Yes
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| OpenSSL | OpenSSL | 4.0.0 to before 4.0.1; 3.6.0 to before 3.6.3; 3.5.0 to before 3.5.7; 3.4.0 to before 3.4.6; 3.0.0 to before 3.0.21 | 4.0.1, 3.6.3, 3.5.7, 3.4.6, 3.0.21 | Patch available | CNA |
- OpenSSL VendorOpenSSL Affected 4.0.0 to before 4.0.1; 3.6.0 to before 3.6.3; 3.5.0 to before 3.5.7; 3.4.0 to before 3.4.6; 3.0.0 to before 3.0.21 Fixed in 4.0.1, 3.6.3, 3.5.7, 3.4.6, 3.0.21 Patch available CNA
Remediation
- Fix · CNA OpenSSL (OpenSSL) Fixed in 4.0.1, 3.6.3, 3.5.7, 3.4.6, 3.0.21
Red Hat 58 advisories
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Fixed in the same release
Records fixed by the same vendor advisory or release, as the CNA lists them.
- Advisory ·
OpenSSL — openssl-library.org/news/secadv/20260609.txt
18 records Highest priority Priority MEDIUM 6 MEDIUM, 12 LOW
Other records, highest priority first
- TI-2026-33226 Heap Use-After-Free in the PKCS7_verify() FunctionPriority MEDIUM 47
- TI-2026-30987 NULL Pointer Dereference in QUIC Server Initial Packet HandlingPriority MEDIUM 41
- TI-2026-26480 Unbounded Memory Growth in the QUIC PATH_CHALLENGE HandlerPriority MEDIUM 41
Vendor assessments
Red Hat
Red Hat rating: Moderate. Red Hat's page for this CVE →
| Product | Status | Plan or fix |
|---|---|---|
| Cert Manager support for Red Hat OpenShift release 1.17 | Fixed | RHSA-2026:82304, RHSA-2026:82322, RHSA-2026:82888 |
| Cert Manager support for Red Hat OpenShift release 1.18 | Fixed | RHSA-2026:82347, RHSA-2026:82354, RHSA-2026:82372, RHSA-2026:82857 |
| Cert Manager support for Red Hat OpenShift release 1.20 | Fixed | RHSA-2026:72502 |
| Cost Management 4 | Fixed | RHSA-2026:39981 |
| Red Hat Discovery 2 | Fixed | RHSA-2026:29197 |
| Red Hat Enterprise Linux AppStream (v. 10) | Fixed | RHSA-2026:25237 |
| Red Hat Enterprise Linux AppStream (v. 9) | Fixed | RHSA-2026:25239 |
| Red Hat Enterprise Linux AppStream E4S (v.9.2) | Fixed | RHSA-2026:84572 |
| Red Hat Enterprise Linux AppStream E4S (v.9.4) | Fixed | RHSA-2026:84573 |
| Red Hat Enterprise Linux AppStream EUS (v. 10.0) | Fixed | RHSA-2026:71542 |
| Red Hat Enterprise Linux AppStream EUS (v.9.6) | Fixed | RHSA-2026:83617 |
| Red Hat Enterprise Linux BaseOS (v. 10) | Fixed | RHSA-2026:25237 |
| Red Hat Enterprise Linux BaseOS (v. 9) | Fixed | RHSA-2026:25239 |
| Red Hat Enterprise Linux BaseOS E4S (v.9.2) | Fixed | RHSA-2026:84572 |
| Red Hat Enterprise Linux BaseOS E4S (v.9.4) | Fixed | RHSA-2026:84573 |
| Red Hat Enterprise Linux BaseOS EUS (v. 10.0) | Fixed | RHSA-2026:71542 |
| Red Hat Enterprise Linux BaseOS EUS (v.9.6) | Fixed | RHSA-2026:83617 |
| Red Hat Hardened Images | Fixed | RHSA-2026:42825, RHSA-2026:55543, RHSA-2026:59635, RHSA-2026:59641, RHSA-2026:62562, RHSA-2026:62563, RHSA-2026:62790, RHSA-2026:67551 |
| Red Hat Insights proxy 1.5 | Fixed | RHSA-2026:34102 |
| Red Hat OpenShift AI 3.0 | Fixed | RHSA-2026:91206, RHSA-2026:91219, RHSA-2026:91232, RHSA-2026:91236, RHSA-2026:91243, RHSA-2026:94459, RHSA-2026:94476 |
| Red Hat OpenShift AI 3.4 | Fixed | RHSA-2026:91217, RHSA-2026:91218, RHSA-2026:91233, RHSA-2026:91234, RHSA-2026:91235, RHSA-2026:91241, RHSA-2026:91244, RHSA-2026:91245, RHSA-2026:91248, RHSA-2026:94468 |
| Red Hat OpenShift AI 3.5 | Fixed | RHSA-2026:91202, RHSA-2026:91204, RHSA-2026:91207, RHSA-2026:91224, RHSA-2026:91237, RHSA-2026:91238, RHSA-2026:91242, RHSA-2026:91246, RHSA-2026:91249, RHSA-2026:94474 |
| Red Hat OpenShift Container Platform 4.18 | Fixed | RHSA-2026:89725 |
| Red Hat OpenShift Container Platform 4.19 | Fixed | RHSA-2026:89651 |
| Red Hat OpenShift Container Platform 4.20 | Fixed | RHSA-2026:89333 |
| Red Hat OpenShift Container Platform 4.21 | Fixed | RHSA-2026:89232 |
| Red Hat Update Infrastructure 5 | Fixed | RHSA-2026:26319, RHSA-2026:58981 |
Not affected: 19 products
- Cost Management 4
- Red Hat Enterprise Linux 10
- Red Hat Enterprise Linux 6
- Red Hat Enterprise Linux 7
- Red Hat Enterprise Linux 8
- Red Hat Enterprise Linux 9
- Red Hat Enterprise Linux AppStream E4S (v.9.2)
- Red Hat Enterprise Linux AppStream E4S (v.9.4)
- Red Hat Enterprise Linux AppStream EUS (v. 10.0)
- Red Hat Enterprise Linux AppStream EUS (v.9.6)
- Red Hat Enterprise Linux BaseOS E4S (v.9.2)
- Red Hat Enterprise Linux BaseOS EUS (v. 10.0)
- Red Hat Enterprise Linux BaseOS EUS (v.9.6)
- Red Hat Hardened Images
- Red Hat JBoss Core Services
- Red Hat JBoss Web Server 6
- Red Hat JBoss Web Server 7
- Red Hat OpenShift Container Platform 4
- Red Hat Update Infrastructure 5
Timeline
- 2026-10-02 Threatist record created from CVE-2026-34182
- 2026-10-03 Alias added: GHSA-f9v2-4w9p-2cwc
- 2026-10-14 Fix available: RHSA-2026:82304 · Red Hat
- 2026-10-14 Fix available: RHSA-2026:82322 · Red Hat
- 2026-10-14 Fix available: RHSA-2026:82372 · Red Hat
- 2026-10-14 Fix available: RHSA-2026:82354 · Red Hat
- 2026-10-14 Fix available: RHSA-2026:82347 · Red Hat
- 2026-10-15 Fix available: RHSA-2026:82857 · Red Hat
- 2026-10-15 Fix available: RHSA-2026:82888 · Red Hat
- 2026-10-16 Fix available: RHSA-2026:83617 · Red Hat
- 2026-10-16 Fix available: Cert Manager support for Red Hat OpenShift release 1.17, Cert Manager support for Red Hat OpenShift release 1.18, Red Hat Enterprise Linux AppStream EUS (v.9.6) +1 · Red Hat
- 2026-10-19 Fix available: RHSA-2026:84572 · Red Hat
- 2026-10-19 Fix available: Red Hat Enterprise Linux AppStream E4S (v.9.2), Red Hat Enterprise Linux BaseOS E4S (v.9.2) · Red Hat
- 2026-10-19 Fix available: RHSA-2026:84573 · Red Hat
- 2026-10-20 Fix available: Red Hat Enterprise Linux AppStream E4S (v.9.4), Red Hat Enterprise Linux BaseOS E4S (v.9.4) · Red Hat
- 2026-10-29 Fix available: RHSA-2026:89232 · Red Hat
- 2026-10-29 Fix available: RHSA-2026:89651 · Red Hat
- 2026-10-29 Fix available: RHSA-2026:89725 · Red Hat
- 2026-10-29 Fix available: RHSA-2026:89333 · Red Hat
- 2026-10-29 Fix available: Red Hat OpenShift Container Platform 4.18, Red Hat OpenShift Container Platform 4.19, Red Hat OpenShift Container Platform 4.20 +1 · Red Hat
- 2026-10-30 Fix available: RHSA-2026:91202 · Red Hat
- 2026-10-30 Fix available: RHSA-2026:91204 · Red Hat
- 2026-10-30 Fix available: RHSA-2026:91206 · Red Hat
- 2026-10-30 Fix available: RHSA-2026:91207 · Red Hat
- 2026-10-30 Fix available: RHSA-2026:91217 · Red Hat
- 2026-10-30 Fix available: RHSA-2026:91219 · Red Hat
- 2026-10-30 Fix available: RHSA-2026:91224 · Red Hat
- 2026-10-30 Fix available: RHSA-2026:91233 · Red Hat
- 2026-10-30 Fix available: RHSA-2026:91232 · Red Hat
- 2026-10-30 Fix available: RHSA-2026:91218 · Red Hat
- 2026-10-30 Fix available: RHSA-2026:91235 · Red Hat
- 2026-10-30 Fix available: RHSA-2026:91234 · Red Hat
- 2026-10-30 Fix available: RHSA-2026:91241 · Red Hat
- 2026-10-30 Fix available: RHSA-2026:91237 · Red Hat
- 2026-10-30 Fix available: RHSA-2026:91238 · Red Hat
- 2026-10-30 Fix available: RHSA-2026:91242 · Red Hat
- 2026-10-30 Fix available: RHSA-2026:91236 · Red Hat
- 2026-10-30 Fix available: RHSA-2026:91245 · Red Hat
- 2026-10-30 Fix available: RHSA-2026:91246 · Red Hat
- 2026-10-30 Fix available: RHSA-2026:91243 · Red Hat
- 2026-10-30 Fix available: RHSA-2026:91244 · Red Hat
- 2026-10-30 Fix available: RHSA-2026:91248 · Red Hat
- 2026-10-30 Fix available: RHSA-2026:91249 · Red Hat
- 2026-10-30 Fix available: Red Hat OpenShift AI 3.0, Red Hat OpenShift AI 3.4, Red Hat OpenShift AI 3.5 · Red Hat
- 2026-11-03 Fix available: RHSA-2026:94459 · Red Hat
- 2026-11-03 Fix available: RHSA-2026:94468 · Red Hat
- 2026-11-03 Affected versions changed · Red Hat
- 2026-11-04 Fix available: RHSA-2026:94474 · Red Hat
- 2026-11-04 Fix available: RHSA-2026:94476 · Red Hat
- 2026-11-04 Affected versions changed · Red Hat
- 2026-11-06 Affected versions changed · Red Hat
References
More Openssl vulnerabilities
- TI-2022-01915 The c_rehash script allows command injection CVSS 3.1CRITICAL 9.8
- TI-2021-02645 SM2 Decryption Buffer Overflow CVSS 3.1CRITICAL 9.8
- TI-2009-03392 The TLS protocol, and the SSL protocol 3.0 and possibly earlier, as used in Microsoft… CVSS 3.1CRITICAL 9.8
- TI-2022-01176 The c_rehash script allows command injection CVSS 3.1CRITICAL 9.8
- TI-2014-00154 The (1) TLS and (2) DTLS implementations in OpenSSL 1.0.1 before 1.0.1g do not properly… KEVCVSS 3.1HIGH 7.5
- TI-2025-14107 Stack buffer overflow in CMS (Auth)EnvelopedData parsing CVSS 3.1HIGH 8.8
Sources
- CVE-2026-34182 · CVE Program
- CVE-2026-34182 · NVD
- FIRST EPSS
- GHSA-f9v2-4w9p-2cwc · GitHub Advisory Database · CC BY 4.0
- CVE-2026-34182 · Red Hat security data · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences