{
  "cveId": "CVE-2026-72897",
  "url": "https://patchblox.com/security/cve/CVE-2026-72897",
  "summary": "CVE-2026-72897 is fixed in 18 products on 1 platform, first by libssl3t64 3.5.5-1ubuntu3.6, released September 28, 2026. It is not reported as exploited. Patch Radar priority: High.",
  "title": "Out-of-Bounds Access After SSL_set_SSL_CTX() During a Handshake",
  "description": "Issue summary: A TLS server that calls SSL_set_SSL_CTX() to switch a connection to a different SSL_CTX part way through a handshake may access memory beyond the end of an internal array if the replacement context knows about more provider signature algorithms than the context the connection was created from. Applications which never call SSL_set_SSL_CTX() are not affected.  Impact summary: A remote peer may be able to cause a small out-of-bounds read, and in some circumstances a fixed-value out-of-bounds write, on the server heap. This may lead to a Denial of Service.  CWE: CWE-787: Out-of-bounds Write  Description: A TLS connection records how many certificate slots it has when it is created, taken from the SSL_CTX that created it: the built-in certificate types plus one slot for each provider TLS-SIGALG entry that context was aware of. That count sizes an internal array of per-slot certificate validity flags.  An application may replace a connection\u0027s SSL_CTX part way through the handshake by calling SSL_set_SSL_CTX(), most commonly from a servername callback in order to serve a different virtual host. Doing so did not refresh the recorded count. A provider signature algorithm\u0027s slot index is its position in the list of whichever context resolves it, so if the replacement context is aware of more of them than the original, an algorithm offered by the peer can resolve to an index beyond the end of the array. Processing the peer\u0027s signature algorithms then reads one four byte word past the end for each such algorithm and, where the word read is zero, writes a fixed value over it. A peer offering many of them can corrupt heap metadata and abort the process.  Only provider signature algorithms which occupy one of the excess slots, and which the server also has configured, have this effect. Codepoints the replacement context does not recognise are discarded without being resolved to a slot, and provider signature algorithms are usable only from TLS 1.3.  The two contexts must therefore be aware of different numbers of provider signature algorithms, which requires separate library contexts, a provider loaded between the two being created, or providers which differ in what they advertise - in 4.0, for example, the default provider advertises SM2 where the FIPS provider does not. A deployment meeting the condition is also unable to negotiate the affected algorithms with legitimate clients, since the same stale count hides the corresponding certificates, so the misconfiguration is likely to be noticed. For that reason, and because the configuration is not the default, this issue has been assessed as Low severity.  FIPS impact: no No FIPS modules are affected by this issue as the affected code is outside the OpenSSL FIPS module boundary.",
  "published": "2026-09-28T17:00:00Z",
  "severity": "Important",
  "cvss": 7.5,
  "cvssVector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
  "cwe": "Out-of-bounds Write",
  "epss": 0.00388,
  "epssPercentile": 0.33197,
  "priority": "High",
  "priorityTier": 3,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "vendorAdvisory": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-72897",
  "fixes": [
    {
      "platform": "linux",
      "product": "edk2-aarch64",
      "release": "amzn 2023",
      "fixedVersion": "20260508-2.amzn2023",
      "fix": "ALAS2023-2026-3227",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-3227",
      "released": "2026-11-07T01:06:24Z"
    },
    {
      "platform": "linux",
      "product": "edk2-ovmf",
      "release": "amzn 2023",
      "fixedVersion": "20260508-2.amzn2023",
      "fix": "ALAS2023-2026-3227",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-3227",
      "released": "2026-11-07T01:06:24Z"
    },
    {
      "platform": "linux",
      "product": "edk2-shell-aa64",
      "release": "amzn 2023",
      "fixedVersion": "20260508-2.amzn2023",
      "fix": "ALAS2023-2026-3227",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-3227",
      "released": "2026-11-07T01:06:24Z"
    },
    {
      "platform": "linux",
      "product": "edk2-shell-x64",
      "release": "amzn 2023",
      "fixedVersion": "20260508-2.amzn2023",
      "fix": "ALAS2023-2026-3227",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-3227",
      "released": "2026-11-07T01:06:24Z"
    },
    {
      "platform": "linux",
      "product": "libssl3t64",
      "release": "Ubuntu 26.04.1 LTS (resolute)",
      "fixedVersion": "3.5.5-1ubuntu3.6",
      "fix": "libssl3t64 3.5.5-1ubuntu3.6",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-resolute-libssl3t64-3.5.5-1ubuntu3.6",
      "released": "2026-09-28T17:00:00Z"
    },
    {
      "platform": "linux",
      "product": "openssl",
      "release": "Debian 13.5 (trixie)",
      "fixedVersion": "3.5.7-1~deb13u3",
      "fix": "DEBIAN-CVE-2026-72897",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-72897",
      "released": "2026-09-30T20:39:22Z"
    },
    {
      "platform": "linux",
      "product": "openssl",
      "release": "Debian 14",
      "fixedVersion": "3.6.5-1",
      "fix": "DEBIAN-CVE-2026-72897",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-72897",
      "released": "2026-09-30T20:39:22Z"
    },
    {
      "platform": "linux",
      "product": "openssl",
      "release": "Ubuntu 26.04.1 LTS (resolute)",
      "fixedVersion": "3.5.5-1ubuntu3.6",
      "fix": "openssl 3.5.5-1ubuntu3.6",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-resolute-openssl-3.5.5-1ubuntu3.6",
      "released": "2026-09-28T17:00:00Z"
    },
    {
      "platform": "linux",
      "product": "openssl",
      "release": "amzn 2023",
      "fixedVersion": "1:3.5.8-1.amzn2023.0.3",
      "fix": "ALAS2023-2026-3204",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-3204",
      "released": "2026-11-07T01:06:24Z"
    },
    {
      "platform": "linux",
      "product": "openssl-3",
      "release": "opensuse-leap 16.0",
      "fixedVersion": "3.5.0-160000.11.1",
      "fix": "OPENSUSE-SU-2026:22102-1",
      "url": "https://patchblox.com/security/fix/linux/opensuse-su-2026-22102-1",
      "released": "2026-11-07T00:47:19Z"
    },
    {
      "platform": "linux",
      "product": "openssl-3",
      "release": "sles 15.7",
      "fixedVersion": "3.5.0-150700.5.53.2",
      "fix": "SUSE-SU-2026:4414-1",
      "url": "https://patchblox.com/security/fix/linux/suse-su-2026-4414-1",
      "released": "2026-10-02T07:37:31Z"
    },
    {
      "platform": "linux",
      "product": "openssl-3",
      "release": "sles 16.0",
      "fixedVersion": "3.5.0-160000.11.1",
      "fix": "SUSE-SU-2026:24245-1",
      "url": "https://patchblox.com/security/fix/linux/suse-su-2026-24245-1",
      "released": "2026-11-07T00:45:20Z"
    },
    {
      "platform": "linux",
      "product": "openssl-debuginfo",
      "release": "amzn 2023",
      "fixedVersion": "1:3.5.8-1.amzn2023.0.3",
      "fix": "ALAS2023-2026-3204",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-3204",
      "released": "2026-11-07T01:06:24Z"
    },
    {
      "platform": "linux",
      "product": "openssl-debugsource",
      "release": "amzn 2023",
      "fixedVersion": "1:3.5.8-1.amzn2023.0.3",
      "fix": "ALAS2023-2026-3204",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-3204",
      "released": "2026-11-07T01:06:24Z"
    },
    {
      "platform": "linux",
      "product": "openssl-devel",
      "release": "amzn 2023",
      "fixedVersion": "1:3.5.8-1.amzn2023.0.3",
      "fix": "ALAS2023-2026-3204",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-3204",
      "released": "2026-11-07T01:06:24Z"
    },
    {
      "platform": "linux",
      "product": "openssl-fips-provider-latest",
      "release": "amzn 2023",
      "fixedVersion": "1:3.5.8-1.amzn2023.0.3",
      "fix": "ALAS2023-2026-3204",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-3204",
      "released": "2026-11-07T01:06:24Z"
    },
    {
      "platform": "linux",
      "product": "openssl-fips-provider-latest-debuginfo",
      "release": "amzn 2023",
      "fixedVersion": "1:3.5.8-1.amzn2023.0.3",
      "fix": "ALAS2023-2026-3204",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-3204",
      "released": "2026-11-07T01:06:24Z"
    },
    {
      "platform": "linux",
      "product": "openssl-libs",
      "release": "amzn 2023",
      "fixedVersion": "1:3.5.8-1.amzn2023.0.3",
      "fix": "ALAS2023-2026-3204",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-3204",
      "released": "2026-11-07T01:06:24Z"
    },
    {
      "platform": "linux",
      "product": "openssl-libs-debuginfo",
      "release": "amzn 2023",
      "fixedVersion": "1:3.5.8-1.amzn2023.0.3",
      "fix": "ALAS2023-2026-3204",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-3204",
      "released": "2026-11-07T01:06:24Z"
    },
    {
      "platform": "linux",
      "product": "openssl-perl",
      "release": "amzn 2023",
      "fixedVersion": "1:3.5.8-1.amzn2023.0.3",
      "fix": "ALAS2023-2026-3204",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-3204",
      "released": "2026-11-07T01:06:24Z"
    },
    {
      "platform": "linux",
      "product": "openssl-provider-legacy",
      "release": "Ubuntu 26.04.1 LTS (resolute)",
      "fixedVersion": "3.5.5-1ubuntu3.6",
      "fix": "openssl-provider-legacy 3.5.5-1ubuntu3.6",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-resolute-openssl-provider-legacy-3.5.5-1ubuntu3.6",
      "released": "2026-09-28T17:00:00Z"
    },
    {
      "platform": "linux",
      "product": "openssl-snapsafe-libs",
      "release": "amzn 2023",
      "fixedVersion": "1:3.5.8-1.amzn2023.0.3",
      "fix": "ALAS2023-2026-3204",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-3204",
      "released": "2026-11-07T01:06:24Z"
    },
    {
      "platform": "linux",
      "product": "openssl-snapsafe-libs-debuginfo",
      "release": "amzn 2023",
      "fixedVersion": "1:3.5.8-1.amzn2023.0.3",
      "fix": "ALAS2023-2026-3204",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-3204",
      "released": "2026-11-07T01:06:24Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-09T13:31:49Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}