Vulnerability-Lookup

RHSA-2026:56097

Vulnerability from csaf_redhat - Published: 2026-08-18 10:51 - Updated: 2026-08-28 12:39

Summary

Red Hat Security Advisory: Red Hat Hardened Images RPMs Security Update

Severity

Important

Notes

Topic: An update for Red Hat Hardened Images RPMs is now available.

Details: This update includes the following RPMs: openssl: * openssl-3.5.6-0.5.hum1 (aarch64, x86_64) * openssl-config-fips-3.5.6-0.5.hum1 (aarch64, x86_64) * openssl-devel-3.5.6-0.5.hum1 (aarch64, x86_64) * openssl-devel-engine-3.5.6-0.5.hum1 (aarch64, x86_64) * openssl-fips-provider-upstream-3.5.6-0.5.hum1 (aarch64, x86_64) * openssl-libs-3.5.6-0.5.hum1 (aarch64, x86_64) * openssl-perl-3.5.6-0.5.hum1 (aarch64, x86_64) * openssl-3.5.6-0.5.hum1.src (src) Security Fix(es): openssl: * CVE-2026-14456

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-2026-14456

A flaw was found in OpenSSL. A remote attacker could exploit this by sending a large number of QUIC Initial packets to an OpenSSL QUIC server. This can cause the server to allocate and queue new incoming channels without limit, leading to unbounded memory growth. The excessive memory consumption can result in a Denial of Service (DoS) condition, making the QUIC listener unavailable.

7.5 (High)


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

CWE-770 - Allocation of Resources Without Limits or Throttling

Affected products

Fixed 3 products

Product	Version	Remediation
Unresolved product id: Red Hat Hardened Images:openssl-main@aarch64	—	Vendor Fix fix Workaround
Unresolved product id: Red Hat Hardened Images:openssl-main@src	—	Vendor Fix fix Workaround
Unresolved product id: Red Hat Hardened Images:openssl-main@x86_64	—	Vendor Fix fix Workaround

Threats

Impact Important

CVE-2026-54876

A flaw was found in OpenSSL. A malicious TLS (Transport Layer Security) server can exploit this vulnerability by sending a specially crafted OCSP (Online Certificate Status Protocol) response during the X.509 certificate chain verification process. This can lead to a memory leak in client applications that have enabled OCSP response checking. Repeated connections to a malicious server could exhaust the client's memory, ultimately resulting in a Denial of Service (DoS).

3.7 (Low)


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

CWE-772 - Missing Release of Resource after Effective Lifetime

Affected products

Fixed 3 products

Product	Version	Remediation
Unresolved product id: Red Hat Hardened Images:openssl-main@aarch64	—	Vendor Fix fix
Unresolved product id: Red Hat Hardened Images:openssl-main@src	—	Vendor Fix fix
Unresolved product id: Red Hat Hardened Images:openssl-main@x86_64	—	Vendor Fix fix

Threats

Impact Low

References

21 references

URL	Category
https://access.redhat.com/errata/RHSA-2026:56097	self
https://access.redhat.com/security/cve/CVE-2026-14456	external
https://access.redhat.com/security/updates/classi…	external
https://images.redhat.com/	external
https://access.redhat.com/security/cve/CVE-2026-54876	external
https://security.access.redhat.com/data/csaf/v2/a…	self
https://access.redhat.com/security/cve/CVE-2026-14456	self
https://bugzilla.redhat.com/show_bug.cgi?id=2515348	external
https://www.cve.org/CVERecord?id=CVE-2026-14456	external
https://nvd.nist.gov/vuln/detail/CVE-2026-14456	external
https://github.com/openssl/openssl/commit/08e7756…	external
https://github.com/openssl/openssl/commit/4084152…	external
https://github.com/openssl/openssl/commit/f2f1465…	external
https://openssl-library.org/news/secadv/20260813.txt	external
https://access.redhat.com/security/cve/CVE-2026-54876	self
https://bugzilla.redhat.com/show_bug.cgi?id=2511600	external
https://www.cve.org/CVERecord?id=CVE-2026-54876	external
https://nvd.nist.gov/vuln/detail/CVE-2026-54876	external
https://github.com/openssl/openssl/commit/155b5fe…	external
https://github.com/openssl/openssl/commit/d8c5104…	external
https://openssl-library.org/news/secadv/20260805.txt	external

JSON

To clipboard

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          "text": "A flaw was found in OpenSSL. A remote attacker could exploit this by sending a large number of QUIC Initial packets to an OpenSSL QUIC server. This can cause the server to allocate and queue new incoming channels without limit, leading to unbounded memory growth. The excessive memory consumption can result in a Denial of Service (DoS) condition, making the QUIC listener unavailable.",
          "title": "Vulnerability description"
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          "product_ids": [
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            "Red Hat Hardened Images:openssl-main@src",
            "Red Hat Hardened Images:openssl-main@x86_64"
          ],
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          "url": "https://access.redhat.com/errata/RHSA-2026:56097"
        },
        {
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          "details": "Rate-limit or firewall inbound QUIC (UDP 443) traffic at the network level to reduce exposure. If QUIC server functionality is not required, disable it and use TLS over TCP instead. The upstream fix introduces a default limit of 256 pending connections, configurable via SSL_set_value_uint(3ossl).",
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            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 7.5,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "NONE",
            "integrityImpact": "NONE",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
            "version": "3.1"
          },
          "products": [
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            "Red Hat Hardened Images:openssl-main@src",
            "Red Hat Hardened Images:openssl-main@x86_64"
          ]
        }
      ],
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          "details": "Important"
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      ],
      "title": "openssl: OpenSSL: Denial of Service via unbounded memory growth in QUIC server"
    },
    {
      "cve": "CVE-2026-54876",
      "cwe": {
        "id": "CWE-772",
        "name": "Missing Release of Resource after Effective Lifetime"
      },
      "discovery_date": "2026-08-05T15:21:19.015952+00:00",
      "ids": [
        {
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          "text": "2511600"
        }
      ],
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        {
          "category": "description",
          "text": "A flaw was found in OpenSSL. A malicious TLS (Transport Layer Security) server can exploit this vulnerability by sending a specially crafted OCSP (Online Certificate Status Protocol) response during the X.509 certificate chain verification process. This can lead to a memory leak in client applications that have enabled OCSP response checking. Repeated connections to a malicious server could exhaust the client\u0027s memory, ultimately resulting in a Denial of Service (DoS).",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "openssl: OpenSSL: Memory leak leads to Denial of Service in OCSP response checking",
          "title": "Vulnerability summary"
        },
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          "category": "general",
          "text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
          "title": "CVSS score applicability"
        }
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          "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-54876"
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        {
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      "release_date": "2026-08-05T13:59:36.466000+00:00",
      "remediations": [
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          "date": "2026-08-18T10:51:22+00:00",
          "details": "For details on how to apply this update, which includes the changes described in this advisory, refer to:\nhttps://images.redhat.com/",
          "product_ids": [
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            "Red Hat Hardened Images:openssl-main@src",
            "Red Hat Hardened Images:openssl-main@x86_64"
          ],
          "restart_required": {
            "category": "none"
          },
          "url": "https://access.redhat.com/errata/RHSA-2026:56097"
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "attackComplexity": "HIGH",
            "attackVector": "NETWORK",
            "availabilityImpact": "LOW",
            "baseScore": 3.7,
            "baseSeverity": "LOW",
            "confidentialityImpact": "NONE",
            "integrityImpact": "NONE",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L",
            "version": "3.1"
          },
          "products": [
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            "Red Hat Hardened Images:openssl-main@src",
            "Red Hat Hardened Images:openssl-main@x86_64"
          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Low"
        }
      ],
      "title": "openssl: OpenSSL: Memory leak leads to Denial of Service in OCSP response checking"
    }
  ]
}

CVE-2026-14456 (GCVE-0-2026-14456)

Vulnerability from cvelistv5 – Published: 2026-08-13 13:55 – Updated: 2026-08-13 17:41

Title

Unbounded Memory Growth in QUIC Server Incoming Channel Queue

Summary

Issue summary: When an OpenSSL QUIC server (Listener SSL object) processes valid QUIC Initial packets for unknown destination connection IDs, it can allocate and queue new incoming channels without enforcing any limit. Impact summary: A remote peer that can make many Initial packets reach the server listener faster than the application accepts connections, can cause the memory allocated to store the per-channel state to grow without any limits, potentially making the QUIC listener unavailable and causing Denial of Service. CWE: CWE-770: Allocation of Resources Without Limits or Throttling Description: The function that handles inbound QUIC packets uses Connection-Id from the packet header to find an existing connection (QUIC channel). If no existing connection is found and the packet type is INITIAL, the function treats the packet as a new connection. It allocates a new channel object and inserts it into a queue where it waits to be accepted by the local application with SSL_accept(3ossl). The memory occupied by these initial channel objects may grow without bounds if the application is not able to call SSL_accept() frequently enough to serve these inbound connection requests. The issue is present since OpenSSL 3.5 when the QUIC server implementation was added. The fix introduces a limit for pending connections. The default limit is set to 256 pending connections (waiting to be accepted by the local application). Applications may change the default by calling SSL_set_value_uint(3ossl). FIPS impact: no The FIPS module is not affected as the QUIC implementation is outside of the OpenSSL FIPS module boundary.

Severity

7.5 (High)


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

SSVC

Exploitation: none Automatable: yes Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-08-13 17:41 UTC

CWE

CWE-770 - Allocation of Resources Without Limits or Throttling

Assigner

openssl mitre root

References

5 references

URL	Tags
https://openssl-library.org/news/secadv/20260813.txt	vendor-advisory
https://github.com/openssl/openssl/commit/f2f1465…	patch
https://github.com/openssl/openssl/commit/4084152…	patch
https://github.com/openssl/openssl/commit/08e7756…	patch
http://www.openwall.com/lists/oss-security/2026/08/13/4

Impacted products

1 product

Vendor	Product	Version
OpenSSL	OpenSSL	Affected: 4.0.0 , < 4.0.2 (semver) Affected: 3.6.0 , < 3.6.4 (semver) Affected: 3.5.0 , < 3.5.8 (semver)

Date Public

2026-08-13 07:00

Credits

Filipe Casal (Trail of Bits) Alexandr Nedvedicky

Show details on NVD website

JSON

To clipboard

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CVE-2026-54876 (GCVE-0-2026-54876)

Vulnerability from cvelistv5 – Published: 2026-08-05 13:59 – Updated: 2026-08-05 19:31

Title

Client-Side Memory Leak in OCSP Response Checking

Summary

Issue summary: A malicious TLS server can cause a memory leak in a TLS client that has enabled OCSP response checking by sending an OCSP response that contains no single response entries. Impact summary: An attacker can leak an attacker-tunable amount of memory per TLS handshake in a victim client application. A long-running client that repeatedly connects to a malicious server can have its memory exhausted, resulting in a Denial of Service. CWE: CWE-401: Missing Release of Memory after Effective Lifetime Description: The affected function is called during X.509 certificate chain verification when OCSP response checking is enabled with the X509_V_FLAG_OCSP_RESP_CHECK or X509_V_FLAG_OCSP_RESP_CHECK_ALL verification flags, for example when a TLS client verifies an OCSP response stapled into the TLS handshake by the server. When the received BasicOCSPResponse contains an empty SEQUENCE OF SingleResponse, which is permitted on the wire and accepted by the OpenSSL decoder, the OCSP_BASICRESP structure allocated by OCSP_response_get1_basic() was not freed because an early return bypassed the cleanup code at the end of the function. The amount of memory leaked per handshake can be amplified by the attacker by padding the certs field of the BasicOCSPResponse with bogus certificates, which are parsed and stored in the leaked structure before the empty response check triggers the early return. A long-running TLS client that repeatedly connects to a malicious server can have its memory exhausted over time. OCSP response checking is not enabled by default. Only client applications that explicitly enable the OCSP response check verification flags are affected. FIPS impact: no The FIPS modules in 4.0 and 3.6 are not affected by this issue as the affected code is outside the OpenSSL FIPS module boundary.

Severity

7.5 (High)


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

SSVC

Exploitation: none Automatable: yes Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-08-05 19:31 UTC

CWE

CWE-401 - Missing Release of Memory after Effective Lifetime

Assigner

openssl mitre root

References

4 references

URL	Tags
https://openssl-library.org/news/secadv/20260805.txt	vendor-advisory
https://github.com/openssl/openssl/commit/d8c5104…	patch
https://github.com/openssl/openssl/commit/155b5fe…	patch
http://www.openwall.com/lists/oss-security/2026/08/05/8

Impacted products

1 product

Vendor	Product	Version
OpenSSL	OpenSSL	Affected: 4.0.0 , < 4.0.2 (semver) Affected: 3.6.0 , < 3.6.4 (semver)

Date Public

2026-08-05 11:43

Credits

Bhabani Sankar Das Zhenzhe Shao Mounir Idrassi

Show details on NVD website

JSON

To clipboard

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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.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.

Action not permitted

RHSA-2026:56097

CVE-2026-14456 (GCVE-0-2026-14456)

CVE-2026-54876 (GCVE-0-2026-54876)

Tags

Sightings

Nomenclature