https://vulnerability.circl.lu Contains only the most 10 recent sightings. http://www.rssboard.org/rss-specification python-feedgen en Mon, 05 Oct 2026 19:16:55 +0000 https://vulnerability.circl.lu/sighting/bcf6e310-f359-4657-9d8b-94f4bf81cdcd/export {"uuid": "bcf6e310-f359-4657-9d8b-94f4bf81cdcd", "vulnerability_lookup_origin": "1a89b78e-f703-45f3-bb86-59eb712668bd", "author": "9f56dd64-161d-43a6-b9c3-555944290a09", "vulnerability": "cve-2026-71885", "type": "seen", "source": "https://infosec.exchange/users/cR0w/statuses/117388342000210416", "content": "Seems to be a theme today. Good think no one uses Bouncy Castle.\nhttps://nvd.nist.gov/vuln/detail/cve-2026-71885\nsev:CRIT 9.2 - CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:L/SC:N/SI:N/SA:N/U:Amber\n\nIn Bouncy Castle for Java before 1.86, the Messaging Layer Security (MLS, RFC 9420) implementation did not bind an X.509 credential to a LeafNode's signature_key. LeafNode.verify() checked a leaf's signature against the signature_key carried in the leaf itself, while the credential's X.509 certificate chain was stored but never parsed or validated, so the end-entity certificate's public key was never required to match signature_key as RFC 9420 sec. 5.3 requires. A party could therefore present another party's certificate as its credential while signing the leaf, and the enclosing KeyPackage, with an unrelated key, and be accepted under that other party's identity through KeyPackage.verify() and the Group leaf-validation path. In a deployment that admits external commits without an independent credential-admission check, an unauthenticated attacker could be admitted under a victim's X.509 identity, evict the victim (resynchronization compares whole credentials rather than signing keys), derive the current epoch, decrypt subsequent group messages, and send messages accepted as the victim. TreeKEM.LeafNode now requires the end-entity certificate's subject public key, in the cipher suite's signature encoding, to equal signature_key for an X.509 credential and rejects the leaf otherwise, including an empty chain or a certificate whose key type does not match the cipher suite; certificate-chain and identity validation to a trust anchor remain the application's responsibility per RFC 9420 sec. 5.3.1. Deployments using only basic credentials are unaffected.", "creation_timestamp": "2026-10-05T12:39:10.846076Z"} {"uuid": "bcf6e310-f359-4657-9d8b-94f4bf81cdcd", "vulnerability_lookup_origin": "1a89b78e-f703-45f3-bb86-59eb712668bd", "author": "9f56dd64-161d-43a6-b9c3-555944290a09", "vulnerability": "cve-2026-71885", "type": "seen", "source": "https://infosec.exchange/users/cR0w/statuses/117388342000210416", "content": "Seems to be a theme today. Good think no one uses Bouncy Castle.\nhttps://nvd.nist.gov/vuln/detail/cve-2026-71885\nsev:CRIT 9.2 - CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:L/SC:N/SI:N/SA:N/U:Amber\n\nIn Bouncy Castle for Java before 1.86, the Messaging Layer Security (MLS, RFC 9420) implementation did not bind an X.509 credential to a LeafNode's signature_key. LeafNode.verify() checked a leaf's signature against the signature_key carried in the leaf itself, while the credential's X.509 certificate chain was stored but never parsed or validated, so the end-entity certificate's public key was never required to match signature_key as RFC 9420 sec. 5.3 requires. A party could therefore present another party's certificate as its credential while signing the leaf, and the enclosing KeyPackage, with an unrelated key, and be accepted under that other party's identity through KeyPackage.verify() and the Group leaf-validation path. In a deployment that admits external commits without an independent credential-admission check, an unauthenticated attacker could be admitted under a victim's X.509 identity, evict the victim (resynchronization compares whole credentials rather than signing keys), derive the current epoch, decrypt subsequent group messages, and send messages accepted as the victim. TreeKEM.LeafNode now requires the end-entity certificate's subject public key, in the cipher suite's signature encoding, to equal signature_key for an X.509 credential and rejects the leaf otherwise, including an empty chain or a certificate whose key type does not match the cipher suite; certificate-chain and identity validation to a trust anchor remain the application's responsibility per RFC 9420 sec. 5.3.1. Deployments using only basic credentials are unaffected.", "creation_timestamp": "2026-10-05T12:39:10.846076Z"} https://vulnerability.circl.lu/sighting/bcf6e310-f359-4657-9d8b-94f4bf81cdcd/export Mon, 05 Oct 2026 12:39:10 +0000 https://vulnerability.circl.lu/sighting/f58ed246-77bd-4d85-81f0-9a7a9e3154ca/export {"uuid": "f58ed246-77bd-4d85-81f0-9a7a9e3154ca", "vulnerability_lookup_origin": "1a89b78e-f703-45f3-bb86-59eb712668bd", "author": "9f56dd64-161d-43a6-b9c3-555944290a09", "vulnerability": "CVE-2026-71885", "type": "seen", "source": "https://bsky.app/profile/deafnews-auto.bsky.social/post/3mx3fzspxug2a", "content": "CVE-2026-71885: Identity Spoofing in Bouncy Castle MLS with CVSS 9.2", "creation_timestamp": "2026-10-04T22:07:59.316421Z"} {"uuid": "f58ed246-77bd-4d85-81f0-9a7a9e3154ca", "vulnerability_lookup_origin": "1a89b78e-f703-45f3-bb86-59eb712668bd", "author": "9f56dd64-161d-43a6-b9c3-555944290a09", "vulnerability": "CVE-2026-71885", "type": "seen", "source": "https://bsky.app/profile/deafnews-auto.bsky.social/post/3mx3fzspxug2a", "content": "CVE-2026-71885: Identity Spoofing in Bouncy Castle MLS with CVSS 9.2", "creation_timestamp": "2026-10-04T22:07:59.316421Z"} https://vulnerability.circl.lu/sighting/f58ed246-77bd-4d85-81f0-9a7a9e3154ca/export Sun, 04 Oct 2026 22:07:59 +0000 https://vulnerability.circl.lu/sighting/bcececc2-afba-406b-acb4-4ec9df3dce17/export {"uuid": "bcececc2-afba-406b-acb4-4ec9df3dce17", "vulnerability_lookup_origin": "1a89b78e-f703-45f3-bb86-59eb712668bd", "author": "9f56dd64-161d-43a6-b9c3-555944290a09", "vulnerability": "CVE-2026-71885", "type": "seen", "source": "https://infosec.exchange/users/offseq/statuses/117379696979656220", "content": "CVE-2026-71885 (CRITICAL): Bouncy Castle for Java <1.86 suffers from X.509 credential binding flaw in MLS. Attackers can impersonate users & decrypt group messages. Upgrade to v1.86+ now. https://radar.offseq.com/threat/in-bouncy-castle-for-java-before-186-the-messaging-layer-security-mls-rfc-9420-implementation-did-not-53cae24ecd925b00 #OffSeq #BouncyCastle #Java #Infosec", "creation_timestamp": "2026-10-04T00:00:38.890269Z"} {"uuid": "bcececc2-afba-406b-acb4-4ec9df3dce17", "vulnerability_lookup_origin": "1a89b78e-f703-45f3-bb86-59eb712668bd", "author": "9f56dd64-161d-43a6-b9c3-555944290a09", "vulnerability": "CVE-2026-71885", "type": "seen", "source": "https://infosec.exchange/users/offseq/statuses/117379696979656220", "content": "CVE-2026-71885 (CRITICAL): Bouncy Castle for Java <1.86 suffers from X.509 credential binding flaw in MLS. Attackers can impersonate users & decrypt group messages. Upgrade to v1.86+ now. https://radar.offseq.com/threat/in-bouncy-castle-for-java-before-186-the-messaging-layer-security-mls-rfc-9420-implementation-did-not-53cae24ecd925b00 #OffSeq #BouncyCastle #Java #Infosec", "creation_timestamp": "2026-10-04T00:00:38.890269Z"} https://vulnerability.circl.lu/sighting/bcececc2-afba-406b-acb4-4ec9df3dce17/export Sun, 04 Oct 2026 00:00:38 +0000 https://vulnerability.circl.lu/sighting/c5fe3874-4c0c-427d-a65e-7dc9a68e49ab/export {"uuid": "c5fe3874-4c0c-427d-a65e-7dc9a68e49ab", "vulnerability_lookup_origin": "1a89b78e-f703-45f3-bb86-59eb712668bd", "author": "9f56dd64-161d-43a6-b9c3-555944290a09", "vulnerability": "cve-2026-71885", "type": "seen", "source": "https://bsky.app/profile/offseq.bsky.social/post/3mwxolliztl2j", "content": "Bouncy Castle BC-JAVA (<1.86) faces a CRITICAL MLS cert validation flaw (CVE-2026-71885). Attackers can hijack group comms. Upgrade to 1.86+ to mitigate. https://radar.offseq.com/threat/cve-2026-71885-cwe-295-improper-certificate-validation-in-legion-of-the-bouncy-castle-inc-bc-java-13dda4ca65417...", "creation_timestamp": "2026-10-03T10:30:28.014110Z"} {"uuid": "c5fe3874-4c0c-427d-a65e-7dc9a68e49ab", "vulnerability_lookup_origin": "1a89b78e-f703-45f3-bb86-59eb712668bd", "author": "9f56dd64-161d-43a6-b9c3-555944290a09", "vulnerability": "cve-2026-71885", "type": "seen", "source": "https://bsky.app/profile/offseq.bsky.social/post/3mwxolliztl2j", "content": "Bouncy Castle BC-JAVA (<1.86) faces a CRITICAL MLS cert validation flaw (CVE-2026-71885). Attackers can hijack group comms. Upgrade to 1.86+ to mitigate. https://radar.offseq.com/threat/cve-2026-71885-cwe-295-improper-certificate-validation-in-legion-of-the-bouncy-castle-inc-bc-java-13dda4ca65417...", "creation_timestamp": "2026-10-03T10:30:28.014110Z"} https://vulnerability.circl.lu/sighting/c5fe3874-4c0c-427d-a65e-7dc9a68e49ab/export Sat, 03 Oct 2026 10:30:28 +0000 https://vulnerability.circl.lu/sighting/9ea5c17f-db72-4b2a-90f4-8d7023e3f794/export {"uuid": "9ea5c17f-db72-4b2a-90f4-8d7023e3f794", "vulnerability_lookup_origin": "1a89b78e-f703-45f3-bb86-59eb712668bd", "author": "9f56dd64-161d-43a6-b9c3-555944290a09", "vulnerability": "cve-2026-71885", "type": "seen", "source": "https://infosec.exchange/users/offseq/statuses/117376511158765467", "content": "CRITICAL CVE-2026-71885 in Bouncy Castle BC-JAVA (<1.86): Improper X.509 cert validation in MLS lets attackers impersonate users & compromise group comms. Upgrade to 1.86+ ASAP. https://radar.offseq.com/threat/cve-2026-71885-cwe-295-improper-certificate-validation-in-legion-of-the-bouncy-castle-inc-bc-java-13dda4ca65417833 #OffSeq #CVE202671885 #JavaSecurity #Infosec", "creation_timestamp": "2026-10-03T10:30:25.424432Z"} {"uuid": "9ea5c17f-db72-4b2a-90f4-8d7023e3f794", "vulnerability_lookup_origin": "1a89b78e-f703-45f3-bb86-59eb712668bd", "author": "9f56dd64-161d-43a6-b9c3-555944290a09", "vulnerability": "cve-2026-71885", "type": "seen", "source": "https://infosec.exchange/users/offseq/statuses/117376511158765467", "content": "CRITICAL CVE-2026-71885 in Bouncy Castle BC-JAVA (<1.86): Improper X.509 cert validation in MLS lets attackers impersonate users & compromise group comms. Upgrade to 1.86+ ASAP. https://radar.offseq.com/threat/cve-2026-71885-cwe-295-improper-certificate-validation-in-legion-of-the-bouncy-castle-inc-bc-java-13dda4ca65417833 #OffSeq #CVE202671885 #JavaSecurity #Infosec", "creation_timestamp": "2026-10-03T10:30:25.424432Z"} https://vulnerability.circl.lu/sighting/9ea5c17f-db72-4b2a-90f4-8d7023e3f794/export Sat, 03 Oct 2026 10:30:25 +0000 https://vulnerability.circl.lu/sighting/ba7ed29b-805a-4bca-80c6-6b4d9ff86a17/export {"uuid": "ba7ed29b-805a-4bca-80c6-6b4d9ff86a17", "vulnerability_lookup_origin": "1a89b78e-f703-45f3-bb86-59eb712668bd", "author": "9f56dd64-161d-43a6-b9c3-555944290a09", "vulnerability": "CVE-2026-71885", "type": "seen", "source": "https://bsky.app/profile/stemshop.bsky.social/post/3mwxnc7avdz2z", "content": "\ud83d\udea8 CVE-2026-71885 \u2014 CVSS 9.2 CRITICAL\n\nIn Bouncy Castle for Java before 1.86, the Messaging Layer Security (MLS, RFC 9420) implementation did not ...\n\n\ud83d\udd0e https://stemshop.top/cve/CVE-2026-71885\n\n#CVE #CyberSecurity #InfoSec", "creation_timestamp": "2026-10-03T10:07:18.054512Z"} {"uuid": "ba7ed29b-805a-4bca-80c6-6b4d9ff86a17", "vulnerability_lookup_origin": "1a89b78e-f703-45f3-bb86-59eb712668bd", "author": "9f56dd64-161d-43a6-b9c3-555944290a09", "vulnerability": "CVE-2026-71885", "type": "seen", "source": "https://bsky.app/profile/stemshop.bsky.social/post/3mwxnc7avdz2z", "content": "\ud83d\udea8 CVE-2026-71885 \u2014 CVSS 9.2 CRITICAL\n\nIn Bouncy Castle for Java before 1.86, the Messaging Layer Security (MLS, RFC 9420) implementation did not ...\n\n\ud83d\udd0e https://stemshop.top/cve/CVE-2026-71885\n\n#CVE #CyberSecurity #InfoSec", "creation_timestamp": "2026-10-03T10:07:18.054512Z"} https://vulnerability.circl.lu/sighting/ba7ed29b-805a-4bca-80c6-6b4d9ff86a17/export Sat, 03 Oct 2026 10:07:18 +0000