MediumFix available

DEBIAN-CVE-2026-17508

Type: advisorySource: OSV1 source record

In Bouncy Castle for Java before 1.86, several password-based key derivation entry points ran the KDF with cost parameters taken from the untrusted input being processed, without bounding them, so a small input could dictate an arbitrary amount of work before any password or integrity check could reject it. The affected paths are the RFC 9579 PBMAC1 MAC calculator builders, which took the PBKDF2 iteration count and derived-key length straight out of PBMAC1Params (JcePBMac1CalculatorBuilder, and PKCS12PBEUtils.createPBMac1Calculator reached from PKCS12PfxPdu.isMacValid); the scrypt parallelization parameter p in the PKCS#8 and PKCS#12 cost guards, which bounded only the cost parameter N and the block size r even though the scratch buffer scales with r times p, so the configured memory ceiling could be evaded entirely; the raw JCA PBKDF2 provider (org.bouncycastle.jcajce.provider.symmetric.PBEPBKDF2); and the bcrypt round count read from an encrypted OpenSSH v1 private key's own kdfoptions. Each now bounds the parameter before deriving, in line with the caps already applied elsewhere in the tree, with the OpenSSH round count configurable through the new org.bouncycastle.openssh.max_rounds property. This completes the bounding begun in 1.85 for the PKCS#8 / PBES2 decryptors (CVE-2026-15055). This issue also affects Bouncy Castle for Java LTS before 2.73.13, and Bouncy Castle for Java FIPS (BC-FJA) before bcpkix-fips 1.0.13 (1.0.X series), 2.0.13 (2.0.X series) and 2.1.13 (2.1.X

Announced 2 Oct 2026Group revision 1

Original source ↗

DEBIAN-CVE-2026-17508

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: osv:DEBIAN-CVE-2026-17508

bouncycastle

Source reference: /affected/0/package/name

Affected versions: 1.72-2
Source reference: /affected/0/versions
1.77-1
Source reference: /affected/0/versions
1.80-1
Source reference: /affected/0/versions
1.80-2
Source reference: /affected/0/versions
1.80-3
Source reference: /affected/0/versions
1.86-1
Source reference: /affected/0/versions
Fixed versions: Not stated in this record
Prerequisites: Not stated in this record

bouncycastle

Source reference: /affected/1/package/name

Affected versions: 1.80-3
Source reference: /affected/1/versions
1.86-1
Source reference: /affected/1/versions
Fixed versions: Not stated in this record
Prerequisites: Not stated in this record

bouncycastle

Source reference: /affected/2/package/name

Affected versions: 1.80-3
Source reference: /affected/2/versions
Fixed versions: 1.86-1
Source reference: /affected/2/ranges
Prerequisites: Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "ranges": [
      {
        "type": "ECOSYSTEM",
        "events": [
          {
            "introduced": "0"
          }
        ]
      }
    ],
    "package": {
      "name": "bouncycastle",
      "purl": "pkg:deb/debian/bouncycastle?arch=source&distro=bookworm",
      "ecosystem": "Debian:12"
    },
    "versions": [
      "1.72-2",
      "1.77-1",
      "1.80-1",
      "1.80-2",
      "1.80-3",
      "1.86-1"
    ],
    "database_specific": {
      "source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-17508.json"
    },
    "ecosystem_specific": {
      "urgency": "not yet assigned"
    }
  },
  {
    "ranges": [
      {
        "type": "ECOSYSTEM",
        "events": [
          {
            "introduced": "0"
          }
        ]
      }
    ],
    "package": {
      "name": "bouncycastle",
      "purl": "pkg:deb/debian/bouncycastle?arch=source&distro=trixie",
      "ecosystem": "Debian:13"
    },
    "versions": [
      "1.80-3",
      "1.86-1"
    ],
    "database_specific": {
      "source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-17508.json"
    },
    "ecosystem_specific": {
      "urgency": "not yet assigned"
    }
  },
  {
    "ranges": [
      {
        "type": "ECOSYSTEM",
        "events": [
          {
            "introduced": "0"
          },
          {
            "fixed": "1.86-1"
          }
        ]
      }
    ],
    "package": {
      "name": "bouncycastle",
      "purl": "pkg:deb/debian/bouncycastle?arch=source&distro=forky",
      "ecosystem": "Debian:14"
    },
    "versions": [
      "1.80-3"
    ],
    "database_specific": {
      "source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-17508.json"
    },
    "ecosystem_specific": {
      "urgency": "not yet assigned"
    }
  }
]

Related CVEs: CVE-2026-17508
Source reference: /upstream

Publisher severity

medium

Source reference: /severity/0/score

Linked CVE context

These ratings describe the referenced vulnerabilities and products. They are not a severity rating for every application using this dependency.

CVE-2026-17508 · Medium

BC-JAVA, BC-JAVA, BC-LTS-JAVA, BC-LTS-JAVA, BC-FJA

Event: #72898 · Revision 1
Added to Heist Feed: Mon, 26 Oct 2026 00:19:35 GMT
Publisher date: Fri, 02 Oct 2026 08:17:01 GMT

Read the original announcement

Revision history

26 Oct 2026DEBIAN-CVE-2026-17508 · Revision 1Source updated