Vulnerability-Lookup

RHSA-2026:80510

Vulnerability from csaf_opensuse - Published: 2026-10-12 03:08 - Updated: 2026-10-30 18:45

Summary

Red Hat Security Advisory: compat-openssl10 security update

Severity

Important

Notes

Topic: An update for compat-openssl10 is now available for Red Hat Enterprise Linux 8. Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.

Details: The OpenSSL toolkit provides support for secure communications between machines. This version of OpenSSL package contains only the libraries and is provided for compatibility with previous releases and software that does not support compilation with OpenSSL-1.1. Security Fix(es): * openssl: compat-openssl: DTLS Retransmits Handshake Messages From a Stale Buffer Offset (CVE-2026-84782) For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

Terms of Use: This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Red Hat Inc. and provide a link to the original.

CVE-2026-84782

A flaw was found in OpenSSL. The Datagram Transport Layer Security (DTLS) retransmission mechanism fails to properly handle handshake message writes that are suspended before completion. A remote attacker could exploit this vulnerability during handshake message retransmission, causing OpenSSL to read past the message buffer or overwrite internal state required to resume writing. This issue can result in information disclosure through out-of-bounds memory reads or cause a Denial of Service (DoS) by crashing the process.

7.4 (High)


                
                  CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:H

CWE-125 - Out-of-bounds Read

Affected products

Fixed 16 products

Product	Version	Remediation
Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:compat-openssl10-1:1.0.2o-4.el8_10.4.aarch64	—	Vendor Fix fix
Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:compat-openssl10-1:1.0.2o-4.el8_10.4.i686	—	Vendor Fix fix
Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:compat-openssl10-1:1.0.2o-4.el8_10.4.ppc64le	—	Vendor Fix fix
Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:compat-openssl10-1:1.0.2o-4.el8_10.4.s390x	—	Vendor Fix fix
Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:compat-openssl10-1:1.0.2o-4.el8_10.4.src	—	Vendor Fix fix
Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:compat-openssl10-1:1.0.2o-4.el8_10.4.x86_64	—	Vendor Fix fix
Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:compat-openssl10-debuginfo-1:1.0.2o-4.el8_10.4.aarch64	—	Vendor Fix fix
Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:compat-openssl10-debuginfo-1:1.0.2o-4.el8_10.4.i686	—	Vendor Fix fix
Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:compat-openssl10-debuginfo-1:1.0.2o-4.el8_10.4.ppc64le	—	Vendor Fix fix
Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:compat-openssl10-debuginfo-1:1.0.2o-4.el8_10.4.s390x	—	Vendor Fix fix
Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:compat-openssl10-debuginfo-1:1.0.2o-4.el8_10.4.x86_64	—	Vendor Fix fix
Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:compat-openssl10-debugsource-1:1.0.2o-4.el8_10.4.aarch64	—	Vendor Fix fix
Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:compat-openssl10-debugsource-1:1.0.2o-4.el8_10.4.i686	—	Vendor Fix fix
Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:compat-openssl10-debugsource-1:1.0.2o-4.el8_10.4.ppc64le	—	Vendor Fix fix
Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:compat-openssl10-debugsource-1:1.0.2o-4.el8_10.4.s390x	—	Vendor Fix fix
Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:compat-openssl10-debugsource-1:1.0.2o-4.el8_10.4.x86_64	—	Vendor Fix fix

Threats

Impact Important

References

9 references

URL	Category
https://access.redhat.com/errata/RHSA-2026:80510	self
https://access.redhat.com/security/updates/classi…	external
https://bugzilla.redhat.com/show_bug.cgi?id=2537080	external
https://security.access.redhat.com/data/csaf/v2/a…	self
https://access.redhat.com/security/cve/CVE-2026-84782	self
https://bugzilla.redhat.com/show_bug.cgi?id=2537080	external
https://www.cve.org/CVERecord?id=CVE-2026-84782	external
https://nvd.nist.gov/vuln/detail/CVE-2026-84782	external
https://openssl-library.org/news/vulnerabilities/…	external

JSON

To clipboard

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CVE-2026-84782 (GCVE-0-2026-84782)

Vulnerability from cvelistv5 – Published: 2026-09-29 15:32 – Updated: 2026-09-29 16:45

Title

DTLS Retransmits Handshake Messages From a Stale Buffer Offset

Summary

Issue summary: The DTLS retransmission logic does not correctly handle a handshake message write that is suspended part-way through. The retransmitted message can be read past the message buffer and the retransmission overwrites the internal state the suspended write needs to resume correctly. Impact summary: The retransmitted message can disclose a heap memory to the peer as plaintext handshake data or cause a crash and a Denial of Service when the read reaches an unmapped memory region. CWE: CWE-125: Out-of-bounds Read Description: DTLS handshake messages can be written out in multiple fragments, and a write can suspend mid-message (returning WANT_WRITE) if the underlying transport temporarily cannot accept more data. While such a write is suspended, the DTLS retransmission timer may independently fire and ask the retransmission logic to resend an earlier, already-acknowledged-as-sent message from its retransmit queue. The retransmission logic reused the same internal buffer and position tracking as the message that was still being written, without resetting the position back to the start of the message being retransmitted. As a result the retransmission was read starting from wherever the suspended write had left off, producing a mislabelled message whose body was leftover bytes from the other, larger message still in flight - content that was never meant to be sent at that point, and which could run past the end of the allocated buffer. Separately, even when the retransmission is positioned correctly, allowing it to run to completion while another write is suspended overwrites the same shared bookkeeping that the suspended write depends on to resume. When the application later resumes the suspended write (via a subsequent SSL_read(), SSL_write(), SSL_accept(), or SSL_connect() call), it finds that bookkeeping in a state inconsistent with the message and aborts the process in a debugging build. The fix resets the retransmission's read position to the start of the message before resending, and skips retransmission entirely whenever a handshake write is still suspended, deferring to the next call that resumes it instead. FIPS impact: no The affected code is outside the FIPS module boundary.

Severity

8.2 (High)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H

SSVC

Exploitation: none Automatable: yes Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-09-29 16:45 UTC

CWE

CWE-125 - Out-of-bounds Read

Assigner

openssl CNA under the mitre root

CNA scorecard B 78/100 over 43 records in the last 180 days details

References

5 references

URL	Tags
https://openssl-library.org/news/secadv/20260929.txt	vendor-advisory
https://github.com/openssl/openssl/commit/d951e02…	patch
https://github.com/openssl/openssl/commit/a383daf…	patch
https://github.com/openssl/openssl/commit/906cf0e…	patch
https://github.com/openssl/openssl/commit/9f6b344…	patch

Impacted products

1 product

Vendor	Product	Version
OpenSSL	OpenSSL	Affected: 4.0.0 , < 4.0.3 (semver) Affected: 3.6.0 , < 3.6.5 (semver) Affected: 3.5.0 , < 3.5.9 (semver) Affected: 3.4.0 , < 3.4.8 (semver) Affected: 3.0.0 , < 3.0.23 (semver) Affected: 1.1.1 , < 1.1.1zj (custom) Affected: 1.0.2 , < 1.0.2zs (custom)

Date Public

2026-09-29 14:21

Credits

Laurent Gaffie (secorizon.com) Ryan Hooper

Show details on NVD website

JSON

To clipboard

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              "value": "Issue summary: The DTLS retransmission logic does not correctly handle\u003cbr\u003ea handshake message write that is suspended part-way through.\u003cbr\u003eThe retransmitted message can be read past the message buffer and\u003cbr\u003ethe retransmission overwrites the internal state the suspended write\u003cbr\u003eneeds to resume correctly.\u003cbr\u003e\u003cbr\u003eImpact summary: The retransmitted message can disclose a heap memory\u003cbr\u003eto the peer as plaintext handshake data or cause a crash and a Denial\u003cbr\u003eof Service when the read reaches an unmapped memory region.\u003cbr\u003e\u003cbr\u003eCWE: CWE-125: Out-of-bounds Read\u003cbr\u003e\u003cbr\u003eDescription: DTLS handshake messages can be written out in multiple\u003cbr\u003efragments, and a write can suspend mid-message (returning WANT_WRITE)\u003cbr\u003eif the underlying transport temporarily cannot accept more data. While\u003cbr\u003esuch a write is suspended, the DTLS retransmission timer may\u003cbr\u003eindependently fire and ask the retransmission logic to resend an\u003cbr\u003eearlier, already-acknowledged-as-sent message from its retransmit\u003cbr\u003equeue.\u003cbr\u003e\u003cbr\u003eThe retransmission logic reused the same internal buffer and position\u003cbr\u003etracking as the message that was still being written, without\u003cbr\u003eresetting the position back to the start of the message being\u003cbr\u003eretransmitted. As a result the retransmission was read starting from\u003cbr\u003ewherever the suspended write had left off, producing a mislabelled\u003cbr\u003emessage whose body was leftover bytes from the other, larger message\u003cbr\u003estill in flight - content that was never meant to be sent at that\u003cbr\u003epoint, and which could run past the end of the allocated buffer.\u003cbr\u003e\u003cbr\u003eSeparately, even when the retransmission is positioned correctly,\u003cbr\u003eallowing it to run to completion while another write is suspended\u003cbr\u003eoverwrites the same shared bookkeeping that the suspended write\u003cbr\u003edepends on to resume. When the application later resumes the\u003cbr\u003esuspended write (via a subsequent SSL_read(), SSL_write(),\u003cbr\u003eSSL_accept(), or SSL_connect() call), it finds that bookkeeping in a\u003cbr\u003estate inconsistent with the message and aborts the process in\u003cbr\u003ea debugging build.\u003cbr\u003e\u003cbr\u003eThe fix resets the retransmission\u0027s read position to the start of the\u003cbr\u003emessage before resending, and skips retransmission entirely whenever a\u003cbr\u003ehandshake write is still suspended, deferring to the next call that\u003cbr\u003eresumes it instead.\u003cbr\u003e\u003cbr\u003eFIPS impact: no\u003cbr\u003eThe affected code is outside the FIPS module boundary."
            }
          ],
          "value": "Issue summary: The DTLS retransmission logic does not correctly handle\na handshake message write that is suspended part-way through.\nThe retransmitted message can be read past the message buffer and\nthe retransmission overwrites the internal state the suspended write\nneeds to resume correctly.\n\nImpact summary: The retransmitted message can disclose a heap memory\nto the peer as plaintext handshake data or cause a crash and a Denial\nof Service when the read reaches an unmapped memory region.\n\nCWE: CWE-125: Out-of-bounds Read\n\nDescription: DTLS handshake messages can be written out in multiple\nfragments, and a write can suspend mid-message (returning WANT_WRITE)\nif the underlying transport temporarily cannot accept more data. While\nsuch a write is suspended, the DTLS retransmission timer may\nindependently fire and ask the retransmission logic to resend an\nearlier, already-acknowledged-as-sent message from its retransmit\nqueue.\n\nThe retransmission logic reused the same internal buffer and position\ntracking as the message that was still being written, without\nresetting the position back to the start of the message being\nretransmitted. As a result the retransmission was read starting from\nwherever the suspended write had left off, producing a mislabelled\nmessage whose body was leftover bytes from the other, larger message\nstill in flight - content that was never meant to be sent at that\npoint, and which could run past the end of the allocated buffer.\n\nSeparately, even when the retransmission is positioned correctly,\nallowing it to run to completion while another write is suspended\noverwrites the same shared bookkeeping that the suspended write\ndepends on to resume. When the application later resumes the\nsuspended write (via a subsequent SSL_read(), SSL_write(),\nSSL_accept(), or SSL_connect() call), it finds that bookkeeping in a\nstate inconsistent with the message and aborts the process in\na debugging build.\n\nThe fix resets the retransmission\u0027s read position to the start of the\nmessage before resending, and skips retransmission entirely whenever a\nhandshake write is still suspended, deferring to the next call that\nresumes it instead.\n\nFIPS impact: no\nThe affected code is outside the FIPS module boundary."
        }
      ],
      "metrics": [
        {
          "format": "other",
          "other": {
            "content": {
              "text": "High"
            },
            "type": "https://openssl-library.org/policies/general/security-policy/"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-125",
              "description": "CWE-125 Out-of-bounds Read",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-09-29T15:32:23.605Z",
        "orgId": "3a12439a-ef3a-4c79-92e6-6081a721f1e5",
        "shortName": "openssl"
      },
      "references": [
        {
          "name": "OpenSSL Advisory",
          "tags": [
            "vendor-advisory"
          ],
          "url": "https://openssl-library.org/news/secadv/20260929.txt"
        },
        {
          "name": "4.0.3 git commit",
          "tags": [
            "patch"
          ],
          "url": "https://github.com/openssl/openssl/commit/d951e02ede8f6a6ff8150546db44b34f0518192c"
        },
        {
          "name": "3.6.5 git commit",
          "tags": [
            "patch"
          ],
          "url": "https://github.com/openssl/openssl/commit/a383dafdd754eb5b22bf45e37e1bff9d07277a58"
        },
        {
          "name": "3.5.9 git commit",
          "tags": [
            "patch"
          ],
          "url": "https://github.com/openssl/openssl/commit/906cf0ef1c85ca40ce69163e9086d6d3fe292943"
        },
        {
          "name": "3.4.8 git commit",
          "tags": [
            "patch"
          ],
          "url": "https://github.com/openssl/openssl/commit/9f6b34422af7eb5dac61322e33dac1ae989fa628"
        }
      ],
      "source": {
        "discovery": "UNKNOWN"
      },
      "title": "DTLS Retransmits Handshake Messages From a Stale Buffer Offset",
      "x_generator": {
        "engine": "Vulnogram 0.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "3a12439a-ef3a-4c79-92e6-6081a721f1e5",
    "assignerShortName": "openssl",
    "cveId": "CVE-2026-84782",
    "datePublished": "2026-09-29T15:32:23.605Z",
    "dateReserved": "2026-09-02T10:14:02.262Z",
    "dateUpdated": "2026-09-29T16:45:40.378Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

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Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

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