Vulnerability-Lookup

OPENSUSE-SU-2026:11672-1

Vulnerability from csaf_opensuse - Published: 2026-09-02 00:00 - Updated: 2026-09-17 17:22

Summary

libmsgpack-c2-7.0.2-2.1 on GA media

Severity

Moderate

Notes

Title of the patch: libmsgpack-c2-7.0.2-2.1 on GA media

Description of the patch: These are all security issues fixed in the libmsgpack-c2-7.0.2-2.1 package on the GA media of openSUSE Tumbleweed.

Patchnames: openSUSE-Tumbleweed-2026-11672

CVE-2026-72854

5.3 (Medium)


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

Affected products

Recommended 8 products

Product	Version	Remediation
Unresolved product id: openSUSE Tumbleweed:libmsgpack-c2-0:7.0.2-2.1.aarch64	—	Vendor Fix
Unresolved product id: openSUSE Tumbleweed:libmsgpack-c2-0:7.0.2-2.1.ppc64le	—	Vendor Fix
Unresolved product id: openSUSE Tumbleweed:libmsgpack-c2-0:7.0.2-2.1.s390x	—	Vendor Fix
Unresolved product id: openSUSE Tumbleweed:libmsgpack-c2-0:7.0.2-2.1.x86_64	—	Vendor Fix
Unresolved product id: openSUSE Tumbleweed:msgpack-c-devel-0:7.0.2-2.1.aarch64	—	Vendor Fix
Unresolved product id: openSUSE Tumbleweed:msgpack-c-devel-0:7.0.2-2.1.ppc64le	—	Vendor Fix
Unresolved product id: openSUSE Tumbleweed:msgpack-c-devel-0:7.0.2-2.1.s390x	—	Vendor Fix
Unresolved product id: openSUSE Tumbleweed:msgpack-c-devel-0:7.0.2-2.1.x86_64	—	Vendor Fix

Threats

Impact moderate

References

5 references

URL	Category
https://www.suse.com/support/security/rating/	external
https://ftp.suse.com/pub/projects/security/csaf/o…	self
https://www.suse.com/security/cve/CVE-2026-72854/	self
https://www.suse.com/security/cve/CVE-2026-72854	external
https://bugzilla.suse.com/1275911	external

JSON

To clipboard

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          "text": "msgpack_unpacker_expand_buffer in src/unpack.c, reached through the public msgpack_unpacker_reserve_buffer API, computes its new buffer size using an unchecked size_t addition of the requested size and the amount already used. The doubling loop guards its own multiplication against overflow, but the addition in the loop condition is unguarded, so a request near SIZE_MAX wraps: the loop condition is already satisfied, the allocation is performed at the small pre-wrap size, and the function returns true. The caller is told the requested capacity was reserved when it was not, so a subsequent write of the requested length overflows the heap buffer. The library\u0027s own example/lib_buffer_unpack.c demonstrates the reserve-then-write pattern, and its defensive assert comparing capacity against the request is compiled out under NDEBUG. msgpack-c\u0027s own decode entry points do not derive the reservation size from untrusted input, so reaching this requires an integration that passes an attacker-influenced length to the reservation API, such as a length-prefixed streaming transport.",
          "title": "CVE description"
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}

CVE-2026-72854 (GCVE-0-2026-72854)

Vulnerability from cvelistv5 – Published: 2026-08-20 18:19 – Updated: 2026-09-24 14:19

Title

msgpack-c Integer Overflow in msgpack_unpacker_expand_buffer Causes a False-Success Undersized Reservation

Summary

msgpack_unpacker_expand_buffer in src/unpack.c, reached through the public msgpack_unpacker_reserve_buffer API, computes its new buffer size using an unchecked size_t addition of the requested size and the amount already used. The doubling loop guards its own multiplication against overflow, but the addition in the loop condition is unguarded, so a request near SIZE_MAX wraps: the loop condition is already satisfied, the allocation is performed at the small pre-wrap size, and the function returns true. The caller is told the requested capacity was reserved when it was not, so a subsequent write of the requested length overflows the heap buffer. The library's own example/lib_buffer_unpack.c demonstrates the reserve-then-write pattern, and its defensive assert comparing capacity against the request is compiled out under NDEBUG. msgpack-c's own decode entry points do not derive the reservation size from untrusted input, so reaching this requires an integration that passes an attacker-influenced length to the reservation API, such as a length-prefixed streaming transport.

Severity

5.3 (Medium)


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

5.8 (Medium)


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

SSVC

Exploitation: poc Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-08-20 18:52 UTC

CWE

CWE-190 - Integer Overflow or Wraparound
CWE-787 - Out-of-bounds Write

Assigner

VulnCheck CNA under the mitre root

CNA scorecard B 84/100 over 6398 records in the last 180 days details

References

6 references

URL	Tags
https://github.com/msgpack/msgpack-c/issues/1181	issue-tracking
https://github.com/msgpack/msgpack-c/blob/c-7.0.1…	technical-description
https://github.com/msgpack/msgpack-c/blob/c-7.0.1…	technical-description
https://github.com/msgpack/msgpack-c/blob/c-7.0.1…	technical-description
https://github.com/msgpack/msgpack-c	product
https://www.vulncheck.com/advisories/msgpack-c-in…	third-party-advisory

Impacted products

1 product

Vendor	Product	Version
msgpack	msgpack-c	Affected: 0 , ≤ 7.0.1 (custom)

Date Public

2026-08-13 00:00

Credits

mtholmquist

Show details on NVD website

JSON

To clipboard

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                "id": "CVE-2026-72854",
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                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-08-20T18:52:52.984726Z",
                "version": "2.0.3"
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          "lang": "en",
          "type": "finder",
          "value": "mtholmquist"
        }
      ],
      "datePublic": "2026-08-13T00:00:00.000Z",
      "descriptions": [
        {
          "lang": "en",
          "value": "msgpack_unpacker_expand_buffer in src/unpack.c, reached through the public msgpack_unpacker_reserve_buffer API, computes its new buffer size using an unchecked size_t addition of the requested size and the amount already used. The doubling loop guards its own multiplication against overflow, but the addition in the loop condition is unguarded, so a request near SIZE_MAX wraps: the loop condition is already satisfied, the allocation is performed at the small pre-wrap size, and the function returns true. The caller is told the requested capacity was reserved when it was not, so a subsequent write of the requested length overflows the heap buffer. The library\u0027s own example/lib_buffer_unpack.c demonstrates the reserve-then-write pattern, and its defensive assert comparing capacity against the request is compiled out under NDEBUG. msgpack-c\u0027s own decode entry points do not derive the reservation size from untrusted input, so reaching this requires an integration that passes an attacker-influenced length to the reservation API, such as a length-prefixed streaming transport."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "HIGH",
            "attackVector": "LOCAL",
            "availabilityImpact": "LOW",
            "baseScore": 5.3,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "NONE",
            "integrityImpact": "HIGH",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "REQUIRED",
            "vectorString": "CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:N/I:H/A:L",
            "version": "3.1"
          },
          "format": "CVSS"
        },
        {
          "cvssV4_0": {
            "attackComplexity": "HIGH",
            "attackRequirements": "PRESENT",
            "attackVector": "LOCAL",
            "baseScore": 5.8,
            "baseSeverity": "MEDIUM",
            "privilegesRequired": "NONE",
            "subAvailabilityImpact": "NONE",
            "subConfidentialityImpact": "NONE",
            "subIntegrityImpact": "NONE",
            "userInteraction": "PASSIVE",
            "vectorString": "CVSS:4.0/AV:L/AC:H/AT:P/PR:N/UI:P/VC:N/VI:H/VA:L/SC:N/SI:N/SA:N",
            "version": "4.0",
            "vulnAvailabilityImpact": "LOW",
            "vulnConfidentialityImpact": "NONE",
            "vulnIntegrityImpact": "HIGH"
          },
          "format": "CVSS"
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-190",
              "description": "Integer Overflow or Wraparound",
              "lang": "en",
              "type": "CWE"
            }
          ]
        },
        {
          "descriptions": [
            {
              "cweId": "CWE-787",
              "description": "Out-of-bounds Write",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-09-24T14:19:03.146Z",
        "orgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10",
        "shortName": "VulnCheck"
      },
      "references": [
        {
          "name": "GitHub Issue #1181",
          "tags": [
            "issue-tracking"
          ],
          "url": "https://github.com/msgpack/msgpack-c/issues/1181"
        },
        {
          "name": "msgpack_unpacker_expand_buffer at c-7.0.1",
          "tags": [
            "technical-description"
          ],
          "url": "https://github.com/msgpack/msgpack-c/blob/c-7.0.1/src/unpack.c#L429-L502"
        },
        {
          "name": "msgpack_unpacker_reserve_buffer capacity contract at c-7.0.1",
          "tags": [
            "technical-description"
          ],
          "url": "https://github.com/msgpack/msgpack-c/blob/c-7.0.1/include/msgpack/unpack.h#L219-L223"
        },
        {
          "name": "Shipped example demonstrating the reserve-then-write pattern",
          "tags": [
            "technical-description"
          ],
          "url": "https://github.com/msgpack/msgpack-c/blob/c-7.0.1/example/lib_buffer_unpack.c"
        },
        {
          "tags": [
            "product"
          ],
          "url": "https://github.com/msgpack/msgpack-c"
        },
        {
          "name": "VulnCheck Advisory: msgpack-c Integer Overflow in msgpack_unpacker_expand_buffer Causes a False-Success Undersized Reservation",
          "tags": [
            "third-party-advisory"
          ],
          "url": "https://www.vulncheck.com/advisories/msgpack-c-integer-overflow-in-msgpack-unpacker-expand-buffer-causes-a-false-success-undersized-reservation"
        }
      ],
      "title": "msgpack-c Integer Overflow in msgpack_unpacker_expand_buffer Causes a False-Success Undersized Reservation",
      "x_generator": {
        "engine": "vulncheck-endgame"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10",
    "assignerShortName": "VulnCheck",
    "cveId": "CVE-2026-72854",
    "datePublished": "2026-08-20T18:19:24.266Z",
    "dateReserved": "2026-08-10T15:16:31.371Z",
    "dateUpdated": "2026-09-24T14:19:03.146Z",
    "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.

Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

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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.

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