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CVE-2026-59639— CMS verifySignatures returns true for SignedData with zero signers

CVSS 8.7 · High EPSS 0.17% · P7

Possible ATT&CK Techniques 1AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 5

VendorProductVersion RangeStatus
Legion of the Bouncy Castle Inc.BC-FJA1.0.0< 1.0.12affected
2.0.0< 2.0.12affected
2.1.0< 2.1.12affected
Legion of the Bouncy Castle Inc.BC-JAVA< 1.85affected
Legion of the Bouncy Castle Inc.BC-LTS-JAVA2.73.0< 2.73.12affected
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I. Basic Information for CVE-2026-59639

Vulnerability Information
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Vulnerability Title
CMS verifySignatures returns true for SignedData with zero signers
Source: CVE Program / CVE List V5
Vulnerability Description
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).
Source: CVE Program / CVE List V5
CVSS Information
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
Source: CVE Program / CVE List V5
Vulnerability Type
密码学签名的验证不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
Legion of the Bouncy Castle Inc BC-JAVA 加密问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Legion of the Bouncy Castle Inc BC-JAVA是Legion of the Bouncy Castle Inc组织的一个提供加密算法的Java组件。 Legion of the Bouncy Castle Inc BC-JAVA 1.85之前版本、Bouncy Castle for Java LTS 2.73.12之前版本和Bouncy Castle for Java FIPS 1.0.12之前版本、2.0.12之前版本和2.1.12之前版本存在加密问题漏洞，该漏洞源于CM
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

VendorProductAffected VersionsCPESubscribe
Legion of the Bouncy Castle Inc.BC-JAVA 0 ~ 1.85 -
Legion of the Bouncy Castle Inc.BC-LTS-JAVA 2.73.0 ~ 2.73.12 -
Legion of the Bouncy Castle Inc.BC-FJA 1.0.0 ~ 1.0.12 -

II. Public POCs for CVE-2026-59639

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III. Intelligence Information for CVE-2026-59639

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Patches & Fixes for CVE-2026-59639 (1)

Security Blog Posts for CVE-2026-59639 (1)

Other References for CVE-2026-59639 (1)

Same Patch Batch · Legion of the Bouncy Castle Inc. · 2026-08-03 · 32 CVEs total

CVE-2026-596389.3 CRITICALJSSE hostname verifier CN-fallback enabled by default despite documented opt-in
CVE-2026-580629.3 CRITICALStapled OCSP response accepted without binding to the checked certificate
CVE-2026-87639.3 CRITICALName Constraints bypass via trailing dot in rfc822Name and URI
CVE-2026-596509.3 CRITICALMTI/A0 DH agreement exponentiates unvalidated peer value
CVE-2026-596428.7 HIGHCMS AuthenticatedData content not bound to MAC when authAttrs present
CVE-2026-128528.7 HIGHMLS wire decoder allocates attacker-declared opaque length before bounds check
CVE-2026-146828.7 HIGHPossible OOM from unbounded up-front allocation on a definite-length read
CVE-2026-128608.7 HIGHRSA PKCS#1 verification skips last two hash bytes in NULL-omitted path
CVE-2026-580618.7 HIGHCCM-family modes write plaintext to caller buffer before tag check
CVE-2026-580598.7 HIGHQuadratic-time escaping when stringifying X.500 distinguished names
CVE-2026-580608.7 HIGHHSS public-key level count unbounded, enabling huge allocation on verify
CVE-2026-128038.7 HIGHKCCMBlockCipher MAC does not bind nonce when AAD is absent (cross-nonce AEAD forgery)
CVE-2026-596458.7 HIGHOER parser recurses without depth limit on self-referential IEEE 1609.2 schema
CVE-2026-596418.7 HIGHS/MIME validator trusts signer-asserted signingTime for path validation
CVE-2026-128168.7 HIGHIESEngine stream-mode MAC forgery via length-dependent KDF split
CVE-2026-128178.7 HIGHOpenPGP AEAD decryption skips final tag on chunk-aligned data
CVE-2026-596438.7 HIGHOpenPGP inline-signature policy failures silently ignored
CVE-2026-596468.7 HIGHDTLS handshake reassembler allocates buffer from unchecked 24-bit length
CVE-2026-596408.7 HIGHOpenPGP CFB quick-check oracle active on symmetric/session-key paths
CVE-2026-596498.7 HIGHOpenPGP user-attribute subpacket length bounded only by JVM max memory

Showing top 20 of 32 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: BC-JAVA
Same vendor: Legion of the Bouncy Castle Inc.
Same weakness: CWE-347

V. Comments for CVE-2026-59639

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