BlackTreeIndependent security intelligence

Full vulnerability report · 2026

CVE-2026-59639High confidence

CMS verifySignatures returns true for SignedData with zero signers

Legion of the Bouncy Castle Inc. · BC-JAVA

8.7HighCVSS 4.0

Recommended action

Within 7 days

High technical severity; prioritise exposed affected systems while verifying vendor guidance.

Patch available

Distribution package intelligence

Ubuntu vendor package status

Canonical’s release and source-package findings are shown separately from local repository availability.

1 package state

Repository candidate not checked

A published vendor fix does not prove that a matching update is enabled and installable on a particular asset. Confirm the local package candidate before scheduling remediation.

Ubuntu release	Source package	Vendor state	Fixed version	Evidence
Ubuntu 24.04 LTSnoble · esm-apps	`bouncycastle`	Under evaluationCanonical reports that the package might be affected and still needs evaluation or fixing.	`Not published in this feed`	Canonical record ↗Source updated 4 Sept 2026

Direct vendor intelligence

Authoritative vendor CSAF and VEX advisories

Structured product status and remediation from the issuing vendor. Product-state explanations are always visible; large lists can be searched or downloaded.

1 current

CVE-2026-59639 · CSAF 2.0 · revision 3 · finalRed Hat Product Securityorg.bouncycastle/bcpkix-jdk15on: org.bouncycastle/bcpkix-fips: Bouncy Castle for Java: Cryptographic signature bypass

41 known affected

The vendor explicitly identifies these products as affected by this CVE.

ceph-base as a component of Red Hat Ceph Storage 9
ceph-common as a component of Red Hat Ceph Storage 9
ceph-fuse as a component of Red Hat Ceph Storage 9
ceph-immutable-object-cache as a component of Red Hat Ceph Storage 9
ceph-mib as a component of Red Hat Ceph Storage 9
ceph-resource-agents as a component of Red Hat Ceph Storage 9
ceph-selinux as a component of Red Hat Ceph Storage 9
ceph.src as a component of Red Hat Ceph Storage 9
cephadm as a component of Red Hat Ceph Storage 9
cephfs-top as a component of Red Hat Ceph Storage 9
libcephfs-devel as a component of Red Hat Ceph Storage 9
libcephfs-proxy2 as a component of Red Hat Ceph Storage 9

Summary: A flaw was found in Bouncy Castle for Java. The library's Cryptographic Message Syntax (CMS) component, which handles digital signature verification, incorrectly validates data that has no signers. This means that even if data is not digitally signed, the system might still consider it legitimate. This could allow an attacker to bypass critical security checks and potentially introduce unauthorized or malicious content.
Remediation: Red Hat is not aware of a mitigation for this flaw other than updating the affected Bouncy Castle component to a fixed version (bc-java 1.85, LTS 2.73.12, or BC-FJA bcpkix-fips 1.0.12/2.0.12/2.1.12) once available for the affected product.

Official European source

ENISA European Vulnerability Database

Official EUVD identifiers, advisory evidence and known-exploited context. Missing fields are not treated as evidence of low risk.

1 current

ENISA EUVD identifier

EUVD-2026-52035

No EUVD known-exploited evidence

ENISA has published the identifier mapping but no EUVD description has been stored yet.

EUVD state: Present in the current official mapping
Known exploitation: Not present in the current ENISA EUVD known-exploited dataset. This is not proof of no exploitation.
ENISA score: Not supplied in the stored EUVD record
Advisory evidence: No linked advisory details stored yet

Recommended actionWithin 7 days

High technical severity; prioritise exposed affected systems while verifying vendor guidance.

Patch available

What, why and how

In Bouncy Castle for Java before 1.85, CMS verifySignatures returns true for SignedData with zero signers. This issue also affects Bouncy Castle for Java LTS before 2.73.12, and Bouncy Castle for Java FIPS (BC-FJA) before bcpkix-fips 1.0.12 (1.0.X series), 2.0.12 (2.0.X series) and 2.1.12 (2.1.X series).

What

Why

The product does not verify, or incorrectly verifies, the cryptographic signature for data.

How

An attacker operating through a network path may attempt exploitation without authentication or user interaction. If successful, the issue may cause the confidentiality, integrity or availability impact described by the vendor.

What

Why

The product does not verify, or incorrectly verifies, the cryptographic signature for data.

How

Exploit reality and attack path

CVSS severity, EPSS forecast probability, public exploit material and CISA-confirmed exploitation are separate signals.

Observed exploitation

Confirmed exploitation and public exploit material are separate signals. Attacks can occur without public proof-of-concept or exploit code.

No confirmed evidence

No CISA KEV match was present at the last successful refresh. This means no confirmation from that source, not proof of no exploitation.

Public PoC / exploit material

Confirmed exploitation and public exploit material are separate signals. Attacks can occur without public proof-of-concept or exploit code.

None recorded

No exploit-tagged reference or CISA SSVC proof-of-concept state is currently recorded. Research may still exist outside the structured feeds.

Likely attack path: a network path → Improper Verification of Cryptographic Signature → cause the confidentiality, integrity or availability impact described by the vendor
Attack surface: Network
Privileges required: None: unauthenticated exploitation is possible
User interaction: None
Attack complexity: Low: no specialised conditions are recorded
Security boundary: Not a CVSS 4.0 base metric
Weakness ? CWE means Common Weakness Enumeration: a standard category for the underlying weakness.: CWE-347 ↗
CWE-347: Improper Verification of Cryptographic Signature. The product does not verify, or incorrectly verifies, the cryptographic signature for data.
CVSS vector ? CVSS means Common Vulnerability Scoring System. The vector records the metric values used to calculate technical severity.: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/U:Amber
Common Vulnerability Scoring System 4.0: the compact vector below is decoded into plain language.
AVNetworkAttack vector: The vulnerable component can be reached over a network.ACLowAttack complexity: No specialised conditions are required beyond attacker-controlled input.ATNoneAttack requirements: No additional deployment or execution condition is required.PRNonePrivileges required: The attacker does not need an account or existing privileges.UINoneUser interaction: No action by another user is required.VCNoneVulnerable-system confidentiality: No direct loss is represented by this metric.VIHighVulnerable-system integrity: A successful attack can cause a major loss.VANoneVulnerable-system availability: No direct loss is represented by this metric.SCNoneSubsequent-system confidentiality: No direct loss is represented by this metric.SINoneSubsequent-system integrity: No direct loss is represented by this metric.SANoneSubsequent-system availability: No direct loss is represented by this metric.
Post-exploitation / living off the land: No specific living-off-the-land technique is confirmed in the structured sources. Monitor normal administration tools for activity inconsistent with the affected service's baseline.

NetworkUnauthenticatedCWE-347

Official authority intelligence

Only matched European and national findings are included. Language selectors and unavailable sources are omitted.

ENISA EUVD · EUVD-2026-52035Official EUVD mapping

0 linked advisory records.

Official EUVD record

BSI · German · WID-SEC-W-2026-2958IBM License Metric Tool: Mehrere Schwachstellen

Ein Angreifer kann mehrere Schwachstellen in IBM License Metric Tool ausnutzen, um beliebigen Programmcode auszuführen, um einen Denial of Service Angriff durchzuführen, um Informationen offenzulegen, um Dateien zu manipulieren und um Sicherheitsvorkehrungen zu umgehen.

Official advisory

BSI · German · WID-SEC-W-2026-2923Atlassian Produkte (Bamboo, Bitbucket, Confluence, Crucible, Fisheye, und Jira): Mehrere Schwachstellen

Ein Angreifer kann mehrere Schwachstellen in Atlassian Bamboo, Atlassian Bitbucket, Atlassian Confluence, Atlassian Crucible, Atlassian Fisheye und Atlassian Jira ausnutzen, um beliebigen Programmcode auszuführen, um einen Denial of Service Angriff durchzuführen, um Informationen offenzulegen, um Dateien zu manipulieren, um einen Cross-Site Scripting Angriff durchzuführen, um einen SQL-Injection Angriff durchzuführen, und um Sicherheitsvorkehrungen zu umgehen.

Official advisory

BSI · German · WID-SEC-W-2026-2622Bouncy Castle: Mehrere Schwachstellen

Ein entfernter, anonymer Angreifer kann mehrere Schwachstellen in Bouncy Castle ausnutzen, um Sicherheitsvorkehrungen zu umgehen, Daten zu manipulieren, sensible Informationen offenzulegen oder einen Denial-of-Service-Zustand auszulösen.

Official advisory

INCIBE-CERT · Spanish · boletin-de-seguridad-de-atlassian-agosto-de-2026Boletín de seguridad de Atlassian: agosto de 2026

n las vulnerabilidades de severidad alta que afectan a Atlassian: CVE-2026-14682: RCE (Remote Code Execution) en org.bouncycastle:bcprov-jdk18on. CVE-2026-12143: RCE (Remote Code Execution) en form-data. CVE-2026-58059: DoS (Denial of Service) en org.bouncycastle:bcprov-jdk18on. CVE-2026-12802: Fallo criptográfico en org.bouncycastle:bcpkix-jdk18on. CVE-2026-58060: RCE (Remote Code Execution) en org.bouncycastle:bcprov-jdk18on. CVE-2026-12803: Fallo criptográfico en org.bouncycastle:bcprov-jdk18on. CVE-2026-13506: DoS (Denial of Service) en org.bouncycastle:bcprov-jdk18on. CVE-2026-56745: DoS (Denial of Service) en io.netty:netty-codec-http. CVE-2026-59639: Fallo criptográfico en org.bouncycastle:bcpkix-jdk18on. CVE-2026-12816: Fallo criptográfico en org.bouncycastle:bcprov-jdk18on. CVE-2026-59901: DoS (Denial of Service) en io.netty:netty-codec. CVE-2026-59642: Fallo criptográfico en org.bouncycastle:bcpkix-jdk18on. CVE-2026-0603: SQLi (SQL Injection) en org.hibernate:hibernate-core-jakarta. CVE-2026-67320: Divulgación de información en axios. CVE-2026-54291: MITM (Man-in-the-Middle) en org.postgresql:postgresql. CVE-2026-41907: RCE (Remote Code Execution) en uuid. CVE-2026-41851: DoS (Denial of Service) en org.springframework:spring-expression. CVE-2026-55831: DoS (Denial of Service) en io.n

Official advisory

NCSC-NL · Dutch · NCSC-2026-0325Kwetsbaarheden verholpen in Atlassian producten

Bouncy Castle for Java versions prior to 1.85, including certain LTS and FIPS releases, contains a vulnerability where the CMS verifySignatures method erroneously returns true for SignedData objects with zero signers.

Official advisory

Patch and workaround

Operational remediation based on structured source evidence.

Status ? Patch availability is based on structured fixed-version fields and authoritative update references. If no fix is verified, check the vendor advisory before making a change.: Patch available
Affected: ceph-base as a component of Red Hat Ceph Storage 9; ceph-common as a component of Red Hat Ceph Storage 9; ceph-fuse as a component of Red Hat Ceph Storage 9; ceph-immutable-object-cache as a component of Red Hat Ceph Storage 9; ceph-mib as a component of Red Hat Ceph Storage 9; ceph-resource-agents as a component of Red Hat Ceph Storage 9; ceph-selinux as a component of Red Hat Ceph Storage 9; ceph.src as a component of Red Hat Ceph Storage 9; cephadm as a component of Red Hat Ceph Storage 9; cephfs-top as a component of Red Hat Ceph Storage 9; libcephfs-devel as a component of Red Hat Ceph Storage 9; libcephfs-proxy2 as a component of Red Hat Ceph Storage 9; libcephfs2 as a component of Red Hat Ceph Storage 9; librados-devel as a component of Red Hat Ceph Storage 9; librados2 as a component of Red Hat Ceph Storage 9; libradospp-devel as a component of Red Hat Ceph Storage 9; libradosstriper1 as a component of Red Hat Ceph Storage 9; librbd-devel as a component of Red Hat Ceph Storage 9; librbd1 as a component of Red Hat Ceph Storage 9; librgw-devel as a component of Red Hat Ceph Storage 9; librgw2 as a component of Red Hat Ceph Storage 9; python3-ceph-argparse as a component of Red Hat Ceph Storage 9; python3-ceph-common as a component of Red Hat Ceph Storage 9; python3-cephfs as a component of Red Hat Ceph Storage 9; python3-rados as a component of Red Hat Ceph Storage 9; python3-rbd as a component of Red Hat Ceph Storage 9; python3-rgw as a component of Red Hat Ceph Storage 9; rbd-nbd as a component of Red Hat Ceph Storage 9; resteasy-javadoc (pki-core:10.6) as a component of Red Hat Enterprise Linux 8; resteasy-javadoc (pki-deps:10.6) as a component of Red Hat Enterprise Linux 8; and 11 more
Fixed: An authoritative update reference is available, but the fixed version is not recorded in the structured CVE fields. Check the linked vendor advisory for the applicable release.
Action: Review the linked authoritative reference and apply the recorded fixed release appropriate to the affected product branch.
Workaround: Red Hat is not aware of a mitigation for this flaw other than updating the affected Bouncy Castle component to a fixed version (bc-java 1.85, LTS 2.73.12, or BC-FJA bcpkix-fips 1.0.12/2.0.12/2.1.12) once available for the affected product.

Evidence and provenance

Published 3 Aug 2026 · Last source change 3 Aug 2026, 13:24 UTC · CWE-347 · Improper Verification of Cryptographic Signature

CVE recordCVE.org · 5.2

CVSS sourceCNA

EPSS source

The date BlackTree first stored a score for this CVE from the daily FIRST EPSS feed.

FIRST · tracked since 2026-08-14

European sourceENISA EUVD · EUVD-2026-52035

Product sourceVendor CSAF · Red Hat Product Security

Remediation sourceVendor CSAF · Red Hat Product Security

CWE sourceCNA

NVD statusNVD enriched

Core structured fields are present and their contributing authorities are shown above.

Material change intelligence

What changed after publication

View recent updates →

3 Aug 2026, 13:24 UTC
Vendor guidanceAuthoritative vendor guidance changed from no authoritative guidance recorded to authoritative remediation link · patch.
Before
no authoritative guidance recorded
After
authoritative remediation link · patch
91579145-5d7b-4cc5-b925-a0262ff19630 ↗
3 Aug 2026, 13:24 UTC
Affected versionsThe structured affected or fixed version information changed.
Before
< 1.85; 2.73.0 < 2.73.12; 1.0.0 < 1.0.12; 2.0.0 < 2.0.12; 2.1.0 < 2.1.12 · Fixed: No fixed version is explicitly recorded in the structured CVE data.
After
< 1.85; 2.73.0 < 2.73.12; 1.0.0 < 1.0.12; 2.0.0 < 2.0.12; 2.1.0 < 2.1.12 · Fixed: An authoritative update reference is available, but the fixed version is not recorded in the structured CVE fields. Check the linked vendor advisory for the applicable release.
CNA ↗
3 Aug 2026, 13:24 UTC
Remediation statusRemediation status changed from Awaiting fix to Patch available.
Before
Awaiting fix
After
Patch available
91579145-5d7b-4cc5-b925-a0262ff19630 ↗

2026-08-03CVE published

2026-08-03Fixed release or patch reference recorded

ENISA EUVD · EUVD-2026-52035↗Vendor CSAF · Red Hat Product Security↗Patch or update reference↗CVE authority or vendor reference↗Official CVE record (CNA and ADP data)↗NVD record↗

Technical terms and abbreviations used in this report

CVE: Common Vulnerabilities and Exposures: the public identifier for one disclosed vulnerability.
CVSS: Common Vulnerability Scoring System: a technical severity framework; it is not patching priority by itself.
EPSS: Exploit Prediction Scoring System: FIRST's estimate of the probability that exploitation activity will be observed in the next 30 days; it is a forecast, not confirmation.
CWE: Common Weakness Enumeration: the standard category describing the underlying software or hardware weakness.
CNA: CVE Numbering Authority: an organisation authorised to assign and publish CVE records.
CISA ADP: Cybersecurity and Infrastructure Security Agency Authorized Data Publisher: structured enrichment added to a CVE record.
NVD: National Vulnerability Database: NIST's enrichment service for CVE records.
CERT / CSIRT: A computer security incident response team that publishes warnings or coordinates incident response.
PoC: Proof of concept: public material that demonstrates or helps reproduce exploitation.
CSAF: Common Security Advisory Framework: a machine-readable format for security advisories.
LoTL: Living off the land: abuse of legitimate tools or system functions during an attack.

CMS verifySignatures returns true for SignedData with zero signers

National CERT insights ?CERT means Computer Emergency Response Team; CSIRT is the closely related term Computer Security Incident Response Team.

EUVD-2026-52035

What, why and how

Exploit reality and attack path

Official authority intelligence

Patch and workaround

Evidence and provenance

National CERT insights
?
CERT means Computer Emergency Response Team; CSIRT is the closely related term Computer Security Incident Response Team.