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TI-2026-11431 Aliases CVE-2026-13506GHSA-qp49-qgx5-5m26

Lazy ASN.1 sequence forcing resets nesting-depth guard

Priority MEDIUM 44CWE-674Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Attack requirements
None
Impact type
Denial of service
Confidentiality · integrity · availability
None · None · High
Fix status
Partial Red Hat: 5 fixed, 11 without a fix

Attack profile from CVSS 4.0 · CNA. Fix status from CNA, GitHub and Red Hat. Impact type from CWE-674.

Summary

In Bouncy Castle for Java before 1.85, Lazy ASN.1 sequence forcing resets nesting-depth guard. This issue also affects Bouncy Castle for Java LTS before 2.73.12, and Bouncy Castle for Java FIPS (BC-FJA) before bc-fips 1.0.2.7 (1.0.X series), 2.0.2 (2.0.X series) and 2.1.3 (2.1.X series).

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00493 42nd percentileScored 2026-11-07
Fix Partial BC-JAVA (Legion of the Bouncy Castle Inc.): 1.85BC-LTS-JAVA (Legion of the Bouncy Castle Inc.): 2.73.12+5 more productsRed Hat: 5 advisoriesRed Hat: 5 fixed, 11 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
Legion of the Bouncy Castle Inc.BC-JAVAbefore 1.851.85Patch availableCNA
Legion of the Bouncy Castle Inc.BC-LTS-JAVA2.73.0 to before 2.73.122.73.12Patch availableCNA
Legion of the Bouncy Castle Inc.BC-FJA1.0.0 to before 1.0.2.7; 2.0.0 to before 2.0.2; 2.1.0 to before 2.1.31.0.2.7, 2.0.2, 2.1.3Patch availableCNA
—org.bouncycastle:bcprov-jdk18on (Maven)before 1.851.85Patch availableGHSA-qp49-qgx5-5m26
—org.bouncycastle:bc-fips (Maven)before 1.0.2.71.0.2.7Patch availableGHSA-qp49-qgx5-5m26
—org.bouncycastle:bc-fips (Maven)2.0.0 to before 2.0.22.0.2Patch availableGHSA-qp49-qgx5-5m26
—org.bouncycastle:bc-fips (Maven)2.1.0 to before 2.1.32.1.3Patch availableGHSA-qp49-qgx5-5m26
—org.bouncycastle:bcprov-lts8on (Maven)before 2.73.122.73.12Patch availableGHSA-qp49-qgx5-5m26
—org.bouncycastle:bcprov-jdk15to18 (Maven)before 1.851.85Patch availableGHSA-qp49-qgx5-5m26
  • BC-JAVA VendorLegion of the Bouncy Castle Inc. Affected before 1.85 Fixed in 1.85 Patch available CNA
  • BC-LTS-JAVA VendorLegion of the Bouncy Castle Inc. Affected 2.73.0 to before 2.73.12 Fixed in 2.73.12 Patch available CNA
  • BC-FJA VendorLegion of the Bouncy Castle Inc. Affected 1.0.0 to before 1.0.2.7; 2.0.0 to before 2.0.2; 2.1.0 to before 2.1.3 Fixed in 1.0.2.7, 2.0.2, 2.1.3 Patch available CNA
  • org.bouncycastle:bcprov-jdk18on (Maven) Vendor— Affected before 1.85 Fixed in 1.85 Patch available GHSA-qp49-qgx5-5m26
  • org.bouncycastle:bc-fips (Maven) Vendor— Affected before 1.0.2.7 Fixed in 1.0.2.7 Patch available GHSA-qp49-qgx5-5m26
  • org.bouncycastle:bc-fips (Maven) Vendor— Affected 2.0.0 to before 2.0.2 Fixed in 2.0.2 Patch available GHSA-qp49-qgx5-5m26
  • org.bouncycastle:bc-fips (Maven) Vendor— Affected 2.1.0 to before 2.1.3 Fixed in 2.1.3 Patch available GHSA-qp49-qgx5-5m26
  • org.bouncycastle:bcprov-lts8on (Maven) Vendor— Affected before 2.73.12 Fixed in 2.73.12 Patch available GHSA-qp49-qgx5-5m26
  • org.bouncycastle:bcprov-jdk15to18 (Maven) Vendor— Affected before 1.85 Fixed in 1.85 Patch available GHSA-qp49-qgx5-5m26

CPE configurations NVD · 3

CPEVersionsRoleVendor
cpe:2.3:a:bouncycastle:bc-java:*:*:*:*:*:*:*:*before 1.85VulnerableLegion of the Bouncy Castle Inc.
cpe:2.3:a:bouncycastle:bouncy_castle_for_java_lts:*:*:*:*:*:*:*:*up to 2.73.11VulnerableLegion of the Bouncy Castle Inc.
cpe:2.3:a:bouncycastle:fips_java_api:*:*:*:*:*:*:*:*1.0.0 to before 1.0.2.7; 2.0.0 to before 2.0.2; 2.1.0 to before 2.1.3VulnerableLegion of the Bouncy Castle Inc.

Remediation

  • Fix · CNA BC-JAVA (Legion of the Bouncy Castle Inc.) Fixed in 1.85
  • Fix · CNA BC-LTS-JAVA (Legion of the Bouncy Castle Inc.) Fixed in 2.73.12
  • Fix · CNA BC-FJA (Legion of the Bouncy Castle Inc.) Fixed in 1.0.2.7, 2.0.2, 2.1.3
  • Fix · GHSA-qp49-qgx5-5m26 org.bouncycastle:bcprov-jdk18on (Maven) Fixed in 1.85 Advisory →
  • Fix · GHSA-qp49-qgx5-5m26 org.bouncycastle:bc-fips (Maven) Fixed in 1.0.2.7 Advisory →
  • Fix · GHSA-qp49-qgx5-5m26 org.bouncycastle:bc-fips (Maven) Fixed in 2.0.2 Advisory →
  • Fix · GHSA-qp49-qgx5-5m26 org.bouncycastle:bc-fips (Maven) Fixed in 2.1.3 Advisory →
  • Fix · GHSA-qp49-qgx5-5m26 org.bouncycastle:bcprov-lts8on (Maven) Fixed in 2.73.12 Advisory →
  • Fix · GHSA-qp49-qgx5-5m26 org.bouncycastle:bcprov-jdk15to18 (Maven) Fixed in 1.85 Advisory →

Red Hat 5 advisories

  • RHSA-2026:95887 Released 2026-11-06 · Red Hat rating Important
    Red Hat JBoss Enterprise Application Platform 8.1.9 security update
    • Red Hat JBoss Enterprise Application Platform 8.1
  • RHSA-2026:95762 Released 2026-11-06 · Red Hat rating Important
    Red Hat build of Keycloak 26.6.8 Images Security Update
    • Red Hat build of Keycloak 26.6 rhbk/keycloak-operator-bundle, rhbk/keycloak-rhel9, rhbk/keycloak-rhel9-operator
  • RHSA-2026:95760 Released 2026-11-06 · Red Hat rating Important
    Red Hat build of Keycloak 26.4.17 Images Security Update
    • Red Hat build of Keycloak 26.4 rhbk/keycloak-operator-bundle, rhbk/keycloak-rhel9, rhbk/keycloak-rhel9-operator
Show 2 more Red Hat advisories
  • RHSA-2026:95761 Released 2026-11-06 · Red Hat rating Important
    Red Hat build of Keycloak 26.6.8 Security Update
    • Red Hat build of Keycloak 26.6.8
  • RHSA-2026:95759 Released 2026-11-06 · Red Hat rating Important
    Red Hat build of Keycloak 26.4.17 Security Update
    • Red Hat build of Keycloak 26.4.17

Fixed in the same release

Records fixed by the same vendor advisory or release, as the CNA lists them.

  • Release ·

    Legion of the Bouncy Castle BC-JAVA 1.85

    32 records Highest priority Priority MEDIUM 23 MEDIUM, 9 LOW

    Other records, highest priority first

    • TI-2026-42545 MTI/A0 DH agreement exponentiates unvalidated peer valuePriority MEDIUM 48
    • TI-2026-42533 JSSE hostname verifier CN-fallback enabled by default despite documented opt-inPriority MEDIUM 48
    • TI-2026-41816 Stapled OCSP response accepted without binding to the checked certificatePriority MEDIUM 48
    Show all 32 records →
  • Release ·

    Legion of the Bouncy Castle BC-LTS-JAVA 2.73.12

    28 records Highest priority Priority MEDIUM 20 MEDIUM, 8 LOW

    Other records, highest priority first

    • TI-2026-42545 MTI/A0 DH agreement exponentiates unvalidated peer valuePriority MEDIUM 48
    • TI-2026-42533 JSSE hostname verifier CN-fallback enabled by default despite documented opt-inPriority MEDIUM 48
    • TI-2026-41816 Stapled OCSP response accepted without binding to the checked certificatePriority MEDIUM 48
    Show all 28 records →
Show 1 more group
  • Release ·

    Legion of the Bouncy Castle BC-FJA 1.0.2.7, 2.0.2, 2.1.3

    7 records Highest priority Priority MEDIUM 5 MEDIUM, 2 LOW

    Other records, highest priority first

    • TI-2026-07701 Name Constraints bypass via trailing dot in rfc822Name and URIPriority MEDIUM 48
    • TI-2026-41813 Quadratic-time escaping when stringifying X.500 distinguished namesPriority MEDIUM 44
    • TI-2026-12374 Possible OOM from unbounded up-front allocation on a definite-length readPriority MEDIUM 44
    Show all 7 records →

Vendor assessments

Red Hat

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

ProductStatusPlan or fix
OpenShift Developer Tools and ServicesAffectedNo fix yet
Red Hat AMQ Broker 7AffectedNo fix yet
Red Hat Ansible Automation Platform 2Affected—
Red Hat Fuse 7AffectedNo fix planned: Out of support scope
Red Hat JBoss Enterprise Application Platform 7AffectedNo fix planned: Out of support scope
Red Hat OpenShift AI (RHOAI)Affected—
Red Hat OpenShift Dev SpacesAffectedNo fix yet
Red Hat Satellite 6Affected—
Red Hat Single Sign-On 7AffectedNo fix planned: Out of support scope
Red Hat build of Apache Camel for Spring Boot 4AffectedNo fix yet
Red Hat build of Apicurio Registry 3AffectedNo fix yet
Red Hat JBoss Enterprise Application Platform 8.1Fixed RHSA-2026:95887
Red Hat build of Keycloak 26.4Fixed RHSA-2026:95760
Red Hat build of Keycloak 26.4.17Fixed RHSA-2026:95759
Red Hat build of Keycloak 26.6Fixed RHSA-2026:95762
Red Hat build of Keycloak 26.6.8Fixed RHSA-2026:95761
Not affected: 4 products
  • OpenShift Developer Tools and Services
  • Red Hat JBoss Enterprise Application Platform Expansion Pack
  • Red Hat build of Apache Camel 4 for Quarkus 3
  • Red Hat build of Quarkus

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-13506
  2. 2026-10-03 Alias added: GHSA-qp49-qgx5-5m26
  3. 2026-10-30 Affected versions changed · Red Hat
  4. 2026-11-06 Fix available: RHSA-2026:95761 · Red Hat
  5. 2026-11-06 Fix available: Red Hat build of Keycloak 26.6.8 · Red Hat
  6. 2026-11-06 Fix available: RHSA-2026:95760 · Red Hat
  7. 2026-11-06 Fix available: RHSA-2026:95887 · Red Hat
  8. 2026-11-06 Fix available: RHSA-2026:95762 · Red Hat
  9. 2026-11-06 Fix available: RHSA-2026:95759 · Red Hat
  10. 2026-11-06 Fix available: Red Hat JBoss Enterprise Application Platform 8.1, Red Hat build of Keycloak 26.4, Red Hat build of Keycloak 26.4.17 +1 · Red Hat

References

Patch 1

Advisory 2

Other 1

  • TI-2018-15967 Legion of the Bouncy Castle Legion of the Bouncy Castle Java Cryptography APIs 1.58 up to… CVSS 3.1CRITICAL 9.8
  • TI-2017-09736 BouncyCastle JCE TLS Bleichenbacher/ROBOT CVSS 3.0HIGH 7.5
  • TI-2026-42545 MTI/A0 DH agreement exponentiates unvalidated peer value CVSS 4.0CRITICAL 9.3
  • TI-2026-42533 JSSE hostname verifier CN-fallback enabled by default despite documented opt-in CVSS 4.0CRITICAL 9.3
  • TI-2026-41816 Stapled OCSP response accepted without binding to the checked certificate CVSS 4.0CRITICAL 9.3
  • TI-2026-07701 Name Constraints bypass via trailing dot in rfc822Name and URI CVSS 4.0CRITICAL 9.3
See all 52 →

Sources

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