Vulnerability-Lookup

SUSE-SU-2026:4182-1

Vulnerability from csaf_suse - Published: 2026-09-15 06:35 - Updated: 2026-09-17 16:48

Summary

Security update for perl-Protocol-HTTP2

Severity

Important

Notes

Title of the patch: Security update for perl-Protocol-HTTP2

Description of the patch: This update for perl-Protocol-HTTP2 fixes the following issue: - CVE-2026-16028: memory exhaustion leading to denial of service due to closed streams never being removed by `stream_state` from the connection stream table (bsc#1279629).

Patchnames: SUSE-2026-4182,SUSE-SLE-Module-Packagehub-Subpackages-15-SP7-2026-4182

CVE-2026-16028

7.5 (High)


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

Affected products

Recommended 1 product

Product	Identifier	Version	Remediation
Unresolved product id: SUSE Linux Enterprise Module for Package Hub 15 SP7:perl-Protocol-HTTP2-0:1.10-150600.3.6.1.noarch		—	Vendor Fix

Threats

Impact important

References

8 references

URL	Category
https://www.suse.com/support/security/rating/	external
https://ftp.suse.com/pub/projects/security/csaf/s…	self
https://www.suse.com/support/update/announcement/…	self
https://www.suse.com/support/update/announcement/…	self
https://bugzilla.suse.com/1279629	self
https://www.suse.com/security/cve/CVE-2026-16028/	self
https://www.suse.com/security/cve/CVE-2026-16028	external
https://bugzilla.suse.com/1279629	external

JSON

To clipboard

{
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        "text": "This update for perl-Protocol-HTTP2 fixes the following issue:\n\n- CVE-2026-16028: memory exhaustion leading to denial of service due to closed streams never being removed by\n  `stream_state` from the connection stream table (bsc#1279629).\n",
        "title": "Description of the patch"
      },
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          "text": "https://www.suse.com/security/cve/CVE-2026-16028"
        }
      ],
      "notes": [
        {
          "category": "general",
          "text": "Protocol::HTTP2 versions before 1.14 for Perl allow memory exhaustion via closed streams that stream_state never removes from the connection stream table.\n\nWhen a stream reaches the CLOSED state, stream_state returns the concurrency slot and clears most of the stream\u0027s keys, but the entry itself stays in the connection stream table and nothing in the distribution removes it. Stream identifiers increase monotonically, so a peer can open and close streams on one connection indefinitely, each close leaving a residual entry that is retained for the life of the connection.\n\nSETTINGS_MAX_CONCURRENT_STREAMS does not bound this. That setting caps how many streams are live at once and is enforced, while the growth is made of streams the cap has already released, so it accumulates with concurrency never exceeding one. The client keeps the same table and grows the same way against a hostile server.\n\nMeasured against a server built on this module, roughly 920 bytes are retained per closed stream for about 19 bytes on the wire, so 100,000 sequential streams on one connection grow server resident memory by about 88 MiB. The streams are ordinary requests that the application accepts and completes.",
          "title": "CVE description"
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          "summary": "SUSE Bug 1279629 for CVE-2026-16028",
          "url": "https://bugzilla.suse.com/1279629"
        }
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          "details": "To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or \"zypper patch\".\n",
          "product_ids": [
            "SUSE Linux Enterprise Module for Package Hub 15 SP7:perl-Protocol-HTTP2-0:1.10-150600.3.6.1.noarch"
          ]
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      ],
      "scores": [
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            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
            "version": "3.1"
          },
          "products": [
            "SUSE Linux Enterprise Module for Package Hub 15 SP7:perl-Protocol-HTTP2-0:1.10-150600.3.6.1.noarch"
          ]
        }
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      "threats": [
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          "category": "impact",
          "date": "2026-09-15T06:35:21Z",
          "details": "important"
        }
      ],
      "title": "CVE-2026-16028"
    }
  ]
}

CVE-2026-16028 (GCVE-0-2026-16028)

Vulnerability from cvelistv5 – Published: 2026-09-07 18:39 – Updated: 2026-09-08 18:39

Title

Protocol::HTTP2 versions before 1.14 for Perl allow memory exhaustion via closed streams that stream_state never removes from the connection stream table

Summary

Protocol::HTTP2 versions before 1.14 for Perl allow memory exhaustion via closed streams that stream_state never removes from the connection stream table. When a stream reaches the CLOSED state, stream_state returns the concurrency slot and clears most of the stream's keys, but the entry itself stays in the connection stream table and nothing in the distribution removes it. Stream identifiers increase monotonically, so a peer can open and close streams on one connection indefinitely, each close leaving a residual entry that is retained for the life of the connection. SETTINGS_MAX_CONCURRENT_STREAMS does not bound this. That setting caps how many streams are live at once and is enforced, while the growth is made of streams the cap has already released, so it accumulates with concurrency never exceeding one. The client keeps the same table and grows the same way against a hostile server. Measured against a server built on this module, roughly 920 bytes are retained per closed stream for about 19 bytes on the wire, so 100,000 sequential streams on one connection grow server resident memory by about 88 MiB. The streams are ordinary requests that the application accepts and completes.

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 2026-09-08 18:38 UTC

CWE

CWE-401 - Missing Release of Memory after Effective Lifetime

Assigner

CPANSec redhat root Scorecard

References

4 references

URL	Tags
https://metacpan.org/release/CRUX/Protocol-HTTP2-…
https://github.com/vlet/p5-Protocol-HTTP2/commit/…	patch
https://metacpan.org/release/CRUX/Protocol-HTTP2-…	release-notes
http://www.openwall.com/lists/oss-security/2026/09/07/2

Impacted products

1 product

Vendor	Product	Version
		Affected: 0 , < 1.14 (custom)

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "providerMetadata": {
          "dateUpdated": "2026-09-07T20:07:29.934Z",
          "orgId": "af854a3a-2127-422b-91ae-364da2661108",
          "shortName": "CVE"
        },
        "references": [
          {
            "url": "http://www.openwall.com/lists/oss-security/2026/09/07/2"
          }
        ],
        "title": "CVE Program Container"
      },
      {
        "metrics": [
          {
            "cvssV3_1": {
              "attackComplexity": "LOW",
              "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"
            }
          },
          {
            "other": {
              "content": {
                "id": "CVE-2026-16028",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "yes"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-09-08T18:38:53.825541Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-09-08T18:39:40.768Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "collectionURL": "https://cpan.org/modules",
          "defaultStatus": "unaffected",
          "modules": [
            "Protocol::HTTP2"
          ],
          "packageName": "Protocol-HTTP2",
          "packageURL": "pkg:cpan/Protocol-HTTP2",
          "programFiles": [
            "lib/Protocol/HTTP2/Stream.pm"
          ],
          "programRoutines": [
            {
              "name": "Protocol::HTTP2::Stream::stream_state"
            }
          ],
          "repo": "https://github.com/vlet/p5-Protocol-HTTP2",
          "versions": [
            {
              "lessThan": "1.14",
              "status": "affected",
              "version": "0",
              "versionType": "custom"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "Protocol::HTTP2 versions before 1.14 for Perl allow memory exhaustion via closed streams that stream_state never removes from the connection stream table.\n\nWhen a stream reaches the CLOSED state, stream_state returns the concurrency slot and clears most of the stream\u0027s keys, but the entry itself stays in the connection stream table and nothing in the distribution removes it. Stream identifiers increase monotonically, so a peer can open and close streams on one connection indefinitely, each close leaving a residual entry that is retained for the life of the connection.\n\nSETTINGS_MAX_CONCURRENT_STREAMS does not bound this. That setting caps how many streams are live at once and is enforced, while the growth is made of streams the cap has already released, so it accumulates with concurrency never exceeding one. The client keeps the same table and grows the same way against a hostile server.\n\nMeasured against a server built on this module, roughly 920 bytes are retained per closed stream for about 19 bytes on the wire, so 100,000 sequential streams on one connection grow server resident memory by about 88 MiB. The streams are ordinary requests that the application accepts and completes."
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-401",
              "description": "CWE-401 Missing Release of Memory after Effective Lifetime",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-09-07T18:39:39.806Z",
        "orgId": "9b29abf9-4ab0-4765-b253-1875cd9b441e",
        "shortName": "CPANSec"
      },
      "references": [
        {
          "url": "https://metacpan.org/release/CRUX/Protocol-HTTP2-1.13/source/lib/Protocol/HTTP2/Stream.pm#L113-126"
        },
        {
          "tags": [
            "patch"
          ],
          "url": "https://github.com/vlet/p5-Protocol-HTTP2/commit/27a488a34d74fd16f123e5e6186d4f677faa246f.patch"
        },
        {
          "tags": [
            "release-notes"
          ],
          "url": "https://metacpan.org/release/CRUX/Protocol-HTTP2-1.14/changes"
        }
      ],
      "solutions": [
        {
          "lang": "en",
          "value": "Upgrade to Protocol-HTTP2 1.14 or later."
        }
      ],
      "source": {
        "discovery": "UNKNOWN"
      },
      "title": "Protocol::HTTP2 versions before 1.14 for Perl allow memory exhaustion via closed streams that stream_state never removes from the connection stream table",
      "workarounds": [
        {
          "lang": "en",
          "value": "For deployments that are not able to upgrade to Protocol-HTTP2 1.14, close each connection after a fixed number of requests, which discards its stream table."
        }
      ],
      "x_generator": {
        "engine": "cpansec-cna-tool 0.1"
      }
    }
  },
  "cveMetadata": {
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    "assignerShortName": "CPANSec",
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    "datePublished": "2026-09-07T18:39:39.806Z",
    "dateReserved": "2026-07-17T08:26:33.147Z",
    "dateUpdated": "2026-09-08T18:39:40.768Z",
    "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.

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.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

Action not permitted

SUSE-SU-2026:4182-1

CVE-2026-16028 (GCVE-0-2026-16028)

Tags

Sightings

Nomenclature

Related by attack behaviour