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TI-2026-18314 Aliases CVE-2026-22796GHSA-r9hf-rxjm-gv2f

ASN1_TYPE Type Confusion in the PKCS7_digest_from_attributes() function

Priority LOW 31CWE-754Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
—
Confidentiality · integrity · availability
None · None · Low
Fix status
Partial Red Hat: 10 fixed, 7 without a fix

Attack profile from CVSS 3.1 · CISA ADP. Fix status from CNA and Red Hat.

Summary

Issue summary: A type confusion vulnerability exists in the signature verification of signed PKCS#7 data where an ASN1_TYPE union member is accessed without first validating the type, causing an invalid or NULL pointer dereference when processing malformed PKCS#7 data. Impact summary: An application performing signature verification of PKCS#7 data or calling directly the PKCS7_digest_from_attributes() function can be caused to dereference an invalid or NULL pointer when reading, resulting in a Denial of Service. The function PKCS7_digest_from_attributes() accesses the message digest attribute value without validating its type. When the type is not V_ASN1_OCTET_STRING, this results in accessing invalid memory through the ASN1_TYPE union, causing a crash. Exploiting this vulnerability requires an attacker to provide a malformed signed PKCS#7 to an application that verifies it. The impact of the exploit is just a Denial of Service, the PKCS7 API is legacy and applications should be using the CMS API instead. For these reasons the issue was assessed as Low severity. The FIPS modules in 3.5, 3.4, 3.3 and 3.0 are not affected by this issue, as the PKCS#7 parsing implementation is outside the OpenSSL FIPS module boundary. OpenSSL 3.6, 3.5, 3.4, 3.3, 3.0, 1.1.1 and 1.0.2 are vulnerable to this issue.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00589 48th percentileScored 2026-11-07
Fix Partial OpenSSL (OpenSSL): 3.6.1, 3.5.5, 3.4.4 +4Red Hat: 12 advisoriesRed Hat: 10 fixed, 7 without a fix

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

VendorProductAffected versionsFixed inStatusSource
OpenSSLOpenSSL3.6.0 to before 3.6.1; 3.5.0 to before 3.5.5; 3.4.0 to before 3.4.4; 3.3.0 to before 3.3.6; 3.0.0 to before 3.0.19; 1.1.1 to before 1.1.1ze; 1.0.2 to before 1.0.2zn3.6.1, 3.5.5, 3.4.4, 3.3.6, 3.0.19, 1.1.1ze, 1.0.2znPatch availableCNA
  • OpenSSL VendorOpenSSL Affected 3.6.0 to before 3.6.1; 3.5.0 to before 3.5.5; 3.4.0 to before 3.4.4; 3.3.0 to before 3.3.6; 3.0.0 to before 3.0.19; 1.1.1 to before 1.1.1ze; 1.0.2 to before 1.0.2zn Fixed in 3.6.1, 3.5.5, 3.4.4, 3.3.6, 3.0.19, 1.1.1ze, 1.0.2zn Patch available CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:openssl:openssl:*:*:*:*:*:*:*:*1.0.2 to before 1.0.2zn; 1.1.1 to before 1.1.1ze; 3.0.0 to before 3.0.19; 3.3.0 to before 3.3.6; 3.4.0 to before 3.4.4; 3.5.0 to before 3.5.5; 3.6.0 to before 3.6.1VulnerableOpenSSL
  • cpe:2.3:a:openssl:openssl:*:*:*:*:*:*:*:* Versions 1.0.2 to before 1.0.2zn; 1.1.1 to before 1.1.1ze; 3.0.0 to before 3.0.19; 3.3.0 to before 3.3.6; 3.4.0 to before 3.4.4; 3.5.0 to before 3.5.5; 3.6.0 to before 3.6.1 Vulnerable ·OpenSSL

Remediation

  • Fix · CNA OpenSSL (OpenSSL) Fixed in 3.6.1, 3.5.5, 3.4.4, 3.3.6, 3.0.19, 1.1.1ze, 1.0.2zn

Red Hat 12 advisories

  • RHSA-2026:82857 Released 2026-10-14 · Red Hat rating Important
    cert-manager Operator for Red Hat OpenShift 1.18.2
    • Cert Manager support for Red Hat OpenShift release 1.18 registry.redhat.io/cert-manager/cert-manager-operator-bundle
  • RHSA-2026:82372 Released 2026-10-13 · Red Hat rating Important
    cert-manager Operator for Red Hat OpenShift 1.18.2
    • Cert Manager support for Red Hat OpenShift release 1.18 registry.redhat.io/cert-manager/cert-manager-operator-rhel9
  • RHSA-2026:82354 Released 2026-10-13 · Red Hat rating Important
    cert-manager Operator for Red Hat OpenShift 1.18.2
    • Cert Manager support for Red Hat OpenShift release 1.18 registry.redhat.io/cert-manager/cert-manager-istio-csr-rhel9
Show 9 more Red Hat advisories
  • RHSA-2026:82347 Released 2026-10-13 · Red Hat rating Important
    cert-manager Operator for Red Hat OpenShift 1.18.2
    • Cert Manager support for Red Hat OpenShift release 1.18 registry.redhat.io/cert-manager/jetstack-cert-manager-acmesolver-rhel9, registry.redhat.io/cert-manager/jetstack-cert-manager-rhel9
  • RHSA-2026:7261 Released 2026-04-09 · Red Hat rating Important
    Red Hat Hardened Images RPMs bug fix and enhancement update
    • Red Hat Hardened Images openssl-3.5.6-0.1.hum1@aarch64, openssl-3.5.6-0.1.hum1@src, openssl-3.5.6-0.1.hum1@x86_64 +10
  • RHSA-2026:4943 Released 2026-03-18 · Red Hat rating Important
    Red Hat Update Infrastructure 5.1 security update
    • Red Hat Update Infrastructure 5 registry.redhat.io/rhui5/cds-rhel9, registry.redhat.io/rhui5/haproxy-rhel9, registry.redhat.io/rhui5/installer-rhel9 +1
  • RHSA-2026:3228 Released 2026-02-24 · Red Hat rating Important
    Cost Management Metrics Operator Update
    • Cost Management 4 registry.redhat.io/costmanagement/costmanagement-metrics-rhel9-operator
  • RHSA-2026:2563 Released 2026-02-11 · Red Hat rating Important
    Red Hat Update Infrastructure 5 security update
    • Red Hat Update Infrastructure 5 registry.redhat.io/rhui5/cds-rhel9, registry.redhat.io/rhui5/haproxy-rhel9, registry.redhat.io/rhui5/installer-rhel9 +1
  • RHSA-2026:2485 Released 2026-02-10 · Red Hat rating Important
    Insights proxy Container Image
    • Red Hat Insights proxy 1.5 registry.redhat.io/insights-proxy/insights-proxy-container-rhel9
  • RHSA-2026:1736 Released 2026-02-02 · Red Hat rating Important
    A Subscription Management tool for finding and reporting Red Hat product usage
    • Red Hat Discovery 2 registry.redhat.io/discovery/discovery-server-rhel9, registry.redhat.io/discovery/discovery-ui-rhel9
  • RHSA-2026:1473 Released 2026-01-28 · Red Hat rating Important
    openssl security update
    • Red Hat Enterprise Linux AppStream (v. 9) openssl-devel-1:3.5.1-7.el9_7, openssl-perl-1:3.5.1-7.el9_7
    • Red Hat Enterprise Linux BaseOS (v. 9) openssl-1:3.5.1-7.el9_7, openssl-libs-1:3.5.1-7.el9_7
  • RHSA-2026:1472 Released 2026-01-28 · Red Hat rating Important
    openssl security update
    • Red Hat Enterprise Linux AppStream (v. 10) openssl-devel-1:3.5.1-7.el10_1, openssl-perl-1:3.5.1-7.el10_1
    • Red Hat Enterprise Linux BaseOS (v. 10) openssl-1:3.5.1-7.el10_1, openssl-libs-1:3.5.1-7.el10_1

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/20260127.txt

    12 records Highest priority Priority CRITICAL 1 CRITICAL, 3 MEDIUM, 8 LOW

    Other records, highest priority first

    • TI-2025-14107 Stack buffer overflow in CMS (Auth)EnvelopedData parsingPriority CRITICAL 85
    • TI-2025-10249 Improper validation of PBMAC1 parameters in PKCS#12 MAC verificationPriority MEDIUM 62
    • TI-2025-42864 NULL Pointer Dereference in PKCS12_item_decrypt_d2i_ex functionPriority MEDIUM 41
    Show all 12 records → Advisory →

Vendor assessments

Red Hat

Red Hat rating: Low. Red Hat's page for this CVE →

ProductStatusPlan or fix
Red Hat Enterprise Linux 10AffectedNo fix yet: Fix deferred
Red Hat Enterprise Linux 6AffectedNo fix yet: Fix deferred
Red Hat Enterprise Linux 7AffectedNo fix yet: Fix deferred
Red Hat Enterprise Linux 8AffectedNo fix yet: Fix deferred
Red Hat Enterprise Linux 9AffectedNo fix yet: Fix deferred
Red Hat JBoss Core ServicesAffectedNo fix yet: Fix deferred
Red Hat OpenShift Container Platform 4AffectedNo fix yet: Fix deferred
Cert Manager support for Red Hat OpenShift release 1.18Fixed RHSA-2026:82347, RHSA-2026:82354, RHSA-2026:82372, RHSA-2026:82857
Cost Management 4Fixed RHSA-2026:3228
Red Hat Discovery 2Fixed RHSA-2026:1736
Red Hat Enterprise Linux AppStream (v. 10)Fixed RHSA-2026:1472
Red Hat Enterprise Linux AppStream (v. 9)Fixed RHSA-2026:1473
Red Hat Enterprise Linux BaseOS (v. 10)Fixed RHSA-2026:1472
Red Hat Enterprise Linux BaseOS (v. 9)Fixed RHSA-2026:1473
Red Hat Hardened ImagesFixed RHSA-2026:7261
Red Hat Insights proxy 1.5Fixed RHSA-2026:2485
Red Hat Update Infrastructure 5Fixed RHSA-2026:2563, RHSA-2026:4943
Not affected: 2 products
  • Cost Management 4
  • Red Hat Update Infrastructure 5

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-22796
  2. 2026-10-03 Alias added: GHSA-r9hf-rxjm-gv2f
  3. 2026-10-14 Fix available: RHSA-2026:82372 · Red Hat
  4. 2026-10-14 Fix available: RHSA-2026:82354 · Red Hat
  5. 2026-10-14 Fix available: RHSA-2026:82347 · Red Hat
  6. 2026-10-15 Fix available: RHSA-2026:82857 · Red Hat
  7. 2026-10-16 Fix available: Cert Manager support for Red Hat OpenShift release 1.18 · Red Hat

References

Patch 5

Advisory 1

  • 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
See all 312 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences