Vulnerability-Lookup

RHSA-2026:20444

Vulnerability from csaf_redhat - Published: 2026-05-25 13:16 - Updated: 2026-05-27 07:49

Summary

Red Hat Security Advisory: General availability of the satellite/iop-gateway-rhel9 container image

Severity

Critical

Notes

Topic: A new satellite/iop-gateway-rhel9 container image is now generally available in the Red Hat container registry.

Details: Red Hat Lightspeed in Satellite analyzes system health and configuration by applying predefined rules to a small set of local data, such as installed packages, running services, and configuration settings. When you install Red Hat Lightspeed in Satellite locally, you can generate Red Hat Lightspeed recommendations without sending system data to Red Hat services.

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-2026-42945

A flaw was found in NGINX, specifically within the ngx_http_rewrite_module. An unauthenticated attacker can exploit this vulnerability by sending crafted HTTP requests under specific rewrite configurations. This can lead to a heap buffer overflow in the NGINX worker process, which may result in arbitrary code execution if Address Space Layout Randomization (ASLR), a security technique to prevent exploitation, is disabled. Otherwise, this flaw causes a denial of service due to a restart of the NGINX worker process.

8.1 (High)


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

CWE-131 - Incorrect Calculation of Buffer Size

Affected products

Fixed 1 product

Product	Identifier	Version	Remediation
Unresolved product id: Red Hat Satellite 6.19:registry.redhat.io/satellite/iop-gateway-rhel9@sha256:a89e475c5d7ca2b40a065d08521be76d7930fe61ab612b97d3e61e550ea95488_amd64		—	Vendor Fix fix

Threats

Impact Critical

References

14 references

URL	Category
https://access.redhat.com/errata/RHSA-2026:20444	self
https://access.redhat.com/documentation/en-us/red…	external
https://access.redhat.com/security/cve/CVE-2026-42945	external
https://access.redhat.com/security/updates/classi…	external
https://catalog.redhat.com/software/containers/search	external
https://docs.redhat.com/en/documentation/red_hat_…	external
https://docs.redhat.com/en/documentation/red_hat_…	external
https://security.access.redhat.com/data/csaf/v2/a…	self
https://access.redhat.com/security/cve/CVE-2026-42945	self
https://bugzilla.redhat.com/show_bug.cgi?id=2477116	external
https://www.cve.org/CVERecord?id=CVE-2026-42945	external
https://nvd.nist.gov/vuln/detail/CVE-2026-42945	external
https://depthfirst.com/nginx-rift	external
https://my.f5.com/manage/s/article/K000161019	external

JSON

To clipboard

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CVE-2026-42945 (GCVE-0-2026-42945)

Vulnerability from cvelistv5 – Published: 2026-05-13 14:12 – Updated: 2026-05-21 18:28

Title

NGINX ngx_http_rewrite_module vulnerability

Summary

NGINX Plus and NGINX Open Source have a vulnerability in the ngx_http_rewrite_module module. This vulnerability exists when the rewrite directive is followed by a rewrite, if, or set directive and an unnamed Perl-Compatible Regular Expression (PCRE) capture (for example, $1, $2) with a replacement string that includes a question mark (?). An unauthenticated attacker along with conditions beyond its control can exploit this vulnerability by sending crafted HTTP requests. This may cause a heap buffer overflow in the NGINX worker process leading to a restart. Additionally, attackers can execute code on systems with Address Space Layout Randomization (ASLR) disabled or when the attacker can bypass ASLR. Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.

Severity

8.1 (High)


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

9.2 (Critical)


                        
                          CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

SSVC

Exploitation: none Automatable: no Technical Impact: total

CISA Coordinator (v2.0.3)

CWE

CWE-122 - Heap-based Buffer Overflow.

Assigner

References

3 references

URL	Tags
https://my.f5.com/manage/s/article/K000161019	vendor-advisorypatch
https://depthfirst.com/nginx-rift
https://github.com/DepthFirstDisclosures/Nginx-Rift

Impacted products

2 products

Vendor	Product	Version
F5	NGINX Plus	Unaffected: R37 , < * (custom) Affected: R36 , < R36 P4 (custom) Affected: R32 , < R32 P6 (custom)
F5	NGINX Open Source	Unaffected: 1.31.0 , < * (semver) Affected: 0.6.27 , < 1.30.1 (semver)

Date Public

2026-05-13 14:00

Credits

F5 acknowledges Zhenpeng (Leo) Lin of depthfirst for bringing this issue to our attention and following the highest standards of coordinated disclosure.

Show details on NVD website

JSON

To clipboard

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            "userInteraction": "NONE",
            "valueDensity": "NOT_DEFINED",
            "vectorString": "CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N",
            "version": "4.0",
            "vulnAvailabilityImpact": "HIGH",
            "vulnConfidentialityImpact": "HIGH",
            "vulnIntegrityImpact": "HIGH",
            "vulnerabilityResponseEffort": "NOT_DEFINED"
          },
          "format": "CVSS",
          "scenarios": [
            {
              "lang": "en",
              "value": "GENERAL"
            }
          ]
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-122",
              "description": "CWE-122 Heap-based Buffer Overflow.",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-05-21T18:28:55.718Z",
        "orgId": "9dacffd4-cb11-413f-8451-fbbfd4ddc0ab",
        "shortName": "f5"
      },
      "references": [
        {
          "tags": [
            "vendor-advisory",
            "patch"
          ],
          "url": "https://my.f5.com/manage/s/article/K000161019"
        }
      ],
      "source": {
        "discovery": "EXTERNAL"
      },
      "title": "NGINX ngx_http_rewrite_module vulnerability",
      "x_generator": {
        "engine": "F5 SIRTBot v1.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "9dacffd4-cb11-413f-8451-fbbfd4ddc0ab",
    "assignerShortName": "f5",
    "cveId": "CVE-2026-42945",
    "datePublished": "2026-05-13T14:12:43.971Z",
    "dateReserved": "2026-04-30T23:04:27.955Z",
    "dateUpdated": "2026-05-21T18:28:55.718Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

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.

Action not permitted

RHSA-2026:20444

CVE-2026-42945 (GCVE-0-2026-42945)

Tags

Sightings

Nomenclature