Goal Reached Thanks to every supporter — we hit 100%!

Goal: 1000 CNY · Raised: 1336 CNY

100%
Buy Us a Coffee

CVE-2026-59640— OpenPGP CFB quick-check oracle active on symmetric/session-key paths

Quick assessment

Affected
Legion of the Bouncy Castle Inc. BC-JAVA
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

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 (BC-FJA) bcpg-fips 1.0.13之前版本、2.0.13之前版本和2.1.13之

CVSS 8.7 · High EPSS 0.26% · P18

Possible ATT&CK Techniques 1 AI

T1555 · Credentials from Password Stores

Affected Version Matrix 5

VendorProduct Version RangeStatus
Legion of the Bouncy Castle Inc. BC-FJA 1.0.0< 1.0.13 affected
2.0.0< 2.0.13 affected
2.1.0< 2.1.13 affected
Legion of the Bouncy Castle Inc. BC-JAVA < 1.85 affected
Legion of the Bouncy Castle Inc. BC-LTS-JAVA 2.73.0< 2.73.12 affected
Get alerts for future matching vulnerabilities Log in to subscribe

I. Basic Information for CVE-2026-59640

Vulnerability Information
Have questions about the vulnerability? See if Shenlong's analysis helps!
View Shenlong Deep Dive ↗

Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.

Vulnerability Title
OpenPGP CFB quick-check oracle active on symmetric/session-key paths
Source: CVE Program / CVE List V5
Vulnerability Description
In Bouncy Castle for Java before 1.85, OpenPGP CFB quick-check oracle active on symmetric/session-key paths. This issue also affects Bouncy Castle for Java LTS before 2.73.12, and Bouncy Castle for Java FIPS (BC-FJA) before bcpg-fips 1.0.13 (1.0.X series), 2.0.13 (2.0.X series) and 2.1.13 (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:H/VI:N/VA:N/SC:N/SI:N/SA:N/U:Amber
Source: CVE Program / CVE List V5
Vulnerability Type
通过差异性导致的信息暴露
Source: CVE Program / CVE List V5
Vulnerability Title
Legion of the Bouncy Castle Inc BC-JAVA 侧信道信息泄露漏洞
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 (BC-FJA) bcpg-fips 1.0.13之前版本、2.0.13之前版本和2.1.13之
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

Vendor Product Affected Versions CPE Subscribe
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 ~ 1.0.13 -

II. Public POCs for CVE-2026-59640

# POC Description Source Link Shenlong Link
AI-Generated POC Premium

No public POC found.

Login to generate AI POC

III. Intelligence Information for CVE-2026-59640

请登录查看更多情报信息。

Patches & Fixes for CVE-2026-59640 (1)

Other References for CVE-2026-59640 (1)

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

CVE-2026-59638 9.3 CRITICAL JSSE hostname verifier CN-fallback enabled by default despite documented opt-in
CVE-2026-58062 9.3 CRITICAL Stapled OCSP response accepted without binding to the checked certificate
CVE-2026-8763 9.3 CRITICAL Name Constraints bypass via trailing dot in rfc822Name and URI
CVE-2026-59650 9.3 CRITICAL MTI/A0 DH agreement exponentiates unvalidated peer value
CVE-2026-59642 8.7 HIGH CMS AuthenticatedData content not bound to MAC when authAttrs present
CVE-2026-12852 8.7 HIGH MLS wire decoder allocates attacker-declared opaque length before bounds check
CVE-2026-14682 8.7 HIGH Possible OOM from unbounded up-front allocation on a definite-length read
CVE-2026-12860 8.7 HIGH RSA PKCS#1 verification skips last two hash bytes in NULL-omitted path
CVE-2026-58061 8.7 HIGH CCM-family modes write plaintext to caller buffer before tag check
CVE-2026-58059 8.7 HIGH Quadratic-time escaping when stringifying X.500 distinguished names
CVE-2026-58060 8.7 HIGH HSS public-key level count unbounded, enabling huge allocation on verify
CVE-2026-12803 8.7 HIGH KCCMBlockCipher MAC does not bind nonce when AAD is absent (cross-nonce AEAD forgery)
CVE-2026-59645 8.7 HIGH OER parser recurses without depth limit on self-referential IEEE 1609.2 schema
CVE-2026-59641 8.7 HIGH S/MIME validator trusts signer-asserted signingTime for path validation
CVE-2026-12816 8.7 HIGH IESEngine stream-mode MAC forgery via length-dependent KDF split
CVE-2026-12817 8.7 HIGH OpenPGP AEAD decryption skips final tag on chunk-aligned data
CVE-2026-59643 8.7 HIGH OpenPGP inline-signature policy failures silently ignored
CVE-2026-59646 8.7 HIGH DTLS handshake reassembler allocates buffer from unchecked 24-bit length
CVE-2026-59649 8.7 HIGH OpenPGP user-attribute subpacket length bounded only by JVM max memory
CVE-2026-12802 8.7 HIGH CMS AuthEnvelopedData fails to enforce tag-length on decryption

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-203

V. Comments for CVE-2026-59640

No comments yet

Leave a comment