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CVE-2026-59648 (GCVE-0-2026-59648)

Vulnerability from cvelistv5 – Published: 2026-08-03 00:45 – Updated: 2026-08-03 13:34
VLAI
Title
OpenPGP Argon2 S2K honours attacker-chosen memory and passes
Summary
In Bouncy Castle for Java before 1.85, OpenPGP Argon2 S2K honours attacker-chosen memory and passes. 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).
Severity
6.9 (Medium)
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/U:Amber
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-03 13:34 UTC
CWE
  • CWE-770 - Allocation of Resources Without Limits or Throttling
Assigner
References
Impacted products
Vendor Product Version CPE status
Legion of the Bouncy Castle Inc. BC-JAVA Affected: 1.71 , < 1.85 (maven)
guessed Create a notification for this product.
Legion of the Bouncy Castle Inc. BC-LTS-JAVA Affected: 2.73.0 , < 2.73.12 (maven)
guessed Create a notification for this product.
Legion of the Bouncy Castle Inc. BC-FJA Affected: 1.0.6 , < 1.0.13 (maven)
Affected: 2.0.0 , < 2.0.13 (maven)
Affected: 2.1.0 , < 2.1.13 (maven)
guessed Create a notification for this product.
Credits
Alex Gaynor in collaboration with Claude and Anthropic Research
Show details on NVD website
To clipboard 

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      "containers": "{\"adp\": [{\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2026-59648\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2026-08-03T13:34:06.778710Z\"}}}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2026-08-03T13:34:12.417Z\"}}], \"cna\": {\"title\": \"OpenPGP Argon2 S2K honours attacker-chosen memory and passes\", \"source\": {\"discovery\": \"UNKNOWN\"}, \"credits\": [{\"lang\": \"en\", \"type\": \"reporter\", \"value\": \"Alex Gaynor in collaboration with Claude and Anthropic Research\"}], \"metrics\": [{\"format\": \"CVSS\", \"cvssV4_0\": {\"Safety\": \"NOT_DEFINED\", \"version\": \"4.0\", \"Recovery\": \"NOT_DEFINED\", \"baseScore\": 6.9, \"Automatable\": \"NOT_DEFINED\", \"attackVector\": \"NETWORK\", \"baseSeverity\": \"MEDIUM\", \"valueDensity\": \"NOT_DEFINED\", \"vectorString\": \"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/U:Amber\", \"exploitMaturity\": \"NOT_DEFINED\", \"providerUrgency\": \"AMBER\", \"userInteraction\": \"NONE\", \"attackComplexity\": \"LOW\", \"attackRequirements\": \"NONE\", \"privilegesRequired\": \"NONE\", \"subIntegrityImpact\": \"NONE\", \"vulnIntegrityImpact\": \"NONE\", \"subAvailabilityImpact\": \"NONE\", \"vulnAvailabilityImpact\": \"LOW\", \"subConfidentialityImpact\": \"NONE\", \"vulnConfidentialityImpact\": \"NONE\", \"vulnerabilityResponseEffort\": \"NOT_DEFINED\"}, \"scenarios\": [{\"lang\": \"en\", \"value\": \"GENERAL\"}]}], \"affected\": [{\"repo\": \"https://github.com/bcgit/bc-java\", \"vendor\": \"Legion of the Bouncy Castle Inc.\", \"modules\": [\"pg\"], \"product\": \"BC-JAVA\", \"versions\": [{\"status\": \"affected\", \"version\": \"1.71\", \"lessThan\": \"1.85\", \"versionType\": \"maven\"}], \"platforms\": [\"all\"], \"packageURL\": \"pkg:maven/org.bouncycastle/bcpg-jdk18on\", \"packageName\": \"bcpg\", \"programFiles\": [\"PGPS2KCalculator\", \"BcPGPS2KCalculator\", \"JcaPGPS2KCalculator\"], \"collectionURL\": \"https://www.bouncycastle.org/download/bouncy-castle-java/\", \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://github.com/bcgit/bc-lts-java\", \"vendor\": \"Legion of the Bouncy Castle Inc.\", \"modules\": [\"pg\"], \"product\": \"BC-LTS-JAVA\", \"versions\": [{\"status\": \"affected\", \"version\": \"2.73.0\", \"lessThan\": \"2.73.12\", \"versionType\": \"maven\"}], \"platforms\": [\"all\"], \"packageURL\": \"pkg:maven/org.bouncycastle/bcpg-lts8on\", \"packageName\": \"bcpg-lts8on\", \"programFiles\": [\"PGPS2KCalculator\", \"BcPGPS2KCalculator\"], \"collectionURL\": \"https://www.bouncycastle.org/download/bouncy-castle-java-lts/\", \"defaultStatus\": \"unaffected\"}, {\"vendor\": \"Legion of the Bouncy Castle Inc.\", \"product\": \"BC-FJA\", \"versions\": [{\"status\": \"affected\", \"version\": \"1.0.6\", \"lessThan\": \"1.0.13\", \"versionType\": \"maven\"}, {\"status\": \"affected\", \"version\": \"2.0.0\", \"lessThan\": \"2.0.13\", \"versionType\": \"maven\"}, {\"status\": \"affected\", \"version\": \"2.1.0\", \"lessThan\": \"2.1.13\", \"versionType\": \"maven\"}], \"platforms\": [\"all\"], \"packageURL\": \"pkg:maven/org.bouncycastle/bcpg-fips\", \"packageName\": \"bcpg-fips\", \"collectionURL\": \"https://www.bouncycastle.org/download/bouncy-castle-java-fips/\", \"defaultStatus\": \"unaffected\"}], \"references\": [{\"url\": \"https://github.com/bcgit/bc-java/wiki/CVE%E2%80%902026%E2%80%9059648\", \"tags\": [\"vendor-advisory\"]}, {\"url\": \"https://github.com/bcgit/bc-java/commit/c915cc3f7a8d58f5ea2f88f01dfef2d402dd0799\", \"tags\": [\"patch\"]}], \"x_generator\": {\"engine\": \"bc release-notes template\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In Bouncy Castle for Java before 1.85, OpenPGP Argon2 S2K honours attacker-chosen memory and passes. 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).\", \"supportingMedia\": [{\"type\": \"text/html\", \"value\": \"\u003cp\u003eIn Bouncy Castle for Java before 1.85, OpenPGP Argon2 S2K honours attacker-chosen memory and passes. 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).\u003c/p\u003e\", \"base64\": false}]}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-770\", \"description\": \"CWE-770 Allocation of Resources Without Limits or Throttling\"}]}], \"providerMetadata\": {\"orgId\": \"91579145-5d7b-4cc5-b925-a0262ff19630\", \"shortName\": \"bcorg\", \"dateUpdated\": \"2026-08-03T04:58:11.776Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2026-59648\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-08-03T13:34:16.152Z\", \"dateReserved\": \"2026-07-06T07:09:01.524Z\", \"assignerOrgId\": \"91579145-5d7b-4cc5-b925-a0262ff19630\", \"datePublished\": \"2026-08-03T00:45:34.967Z\", \"assignerShortName\": \"bcorg\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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Tags
Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.