Vulnerability-Lookup

CVE-2026-8796 (GCVE-0-2026-8796)

Vulnerability from cvelistv5 – Published: 2026-05-31 19:43 – Updated: 2026-06-01 18:42

Title

Sereal::Decoder versions before 5.005 for Perl allow heap out-of-bounds read via crafted input

Summary

Sereal::Decoder versions before 5.005 for Perl allow heap out-of-bounds read via crafted input. In Perl/Decoder/srl_decoder.c, srl_read_object() and srl_read_hash() process a COPY tag, a back-reference whose target byte the decoder re-decodes as a fresh tag. When that target byte matches the SHORT_BINARY pattern (an inline string whose length is encoded in the low bits of the tag), the resulting read is not bounded to precede the COPY tag's own offset and can run past the end of the input buffer. An attacker controlled COPY offset can land inside a previously decoded value rather than on a tag boundary, planting a byte that the decoder reads as a SHORT_BINARY tag and consuming up to 31 following bytes from the heap as a class name (OBJECT path) or hash key (HASH path).

Severity

8.1 (High)


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

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator (v2.0.3)

CWE

CWE-125 - Out-of-bounds Read

Assigner

CPANSec

References

3 references

URL	Tags
https://github.com/Sereal/Sereal/commit/303a2c69c…	patch
https://metacpan.org/release/YVES/Sereal-Decoder-…	release-notes
http://www.openwall.com/lists/oss-security/2026/06/01/1

Impacted products

1 product

Vendor	Product	Version
YVES	Sereal::Decoder	Affected: 0 , < 5.005 (custom)

Show details on NVD website

JSON

To clipboard

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        "metrics": [
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              "confidentialityImpact": "HIGH",
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            },
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          ],
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        }
      ],
      "problemTypes": [
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          "descriptions": [
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              "description": "CWE-125 Out-of-bounds Read",
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          "url": "https://github.com/Sereal/Sereal/commit/303a2c69cdba80bf37a3ff43461e0aa78198a7a3.patch"
        },
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          "url": "https://metacpan.org/release/YVES/Sereal-Decoder-5.005/changes"
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        "discovery": "UNKNOWN"
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          "time": "2026-05-13T00:00:00.000Z",
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        {
          "lang": "en",
          "time": "2026-05-19T00:00:00.000Z",
          "value": "Fix released in Sereal::Decoder 5.005."
        },
        {
          "lang": "en",
          "time": "2026-05-20T00:00:00.000Z",
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    "dateReserved": "2026-05-18T00:38:16.965Z",
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    "redhat_vex": {
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      "cve": "CVE-2026-8796",
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      "product_status:known_not_affected": "1",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "perl-Sereal-Decoder: Sereal::Decoder: Information disclosure via heap out-of-bounds read with crafted input",
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      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-8796.json",
      "version": "2"
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    "vulnrichment": {
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}

FKIE_CVE-2026-8796

Vulnerability from fkie_nvd - Published: 2026-05-31 20:16 - Updated: 2026-07-22 07:10

Severity

8.1 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:H

Summary

References

	URL	Tags
	9b29abf9-4ab0-4765-b253-1875cd9b441e	https://github.com/Sereal/Sereal/commit/303a2c69cdba80bf37a3ff43461e0aa78198a7a3.patch
	9b29abf9-4ab0-4765-b253-1875cd9b441e	https://metacpan.org/release/YVES/Sereal-Decoder-5.005/changes
	af854a3a-2127-422b-91ae-364da2661108	http://www.openwall.com/lists/oss-security/2026/06/01/1

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "collectionURL": "https://cpan.org/modules",
          "defaultStatus": "unaffected",
          "packageName": "Sereal-Decoder",
          "product": "Sereal::Decoder",
          "programFiles": [
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          ],
          "programRoutines": [
            {
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            },
            {
              "name": "srl_read_hash()"
            }
          ],
          "repo": "https://github.com/Sereal/Sereal",
          "vendor": "YVES",
          "versions": [
            {
              "lessThan": "5.005",
              "status": "affected",
              "version": "0",
              "versionType": "custom"
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          ]
        }
      ],
      "source": "9b29abf9-4ab0-4765-b253-1875cd9b441e"
    }
  ],
  "cveTags": [],
  "descriptions": [
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      "lang": "en",
      "value": "Sereal::Decoder versions before 5.005 for Perl allow heap out-of-bounds read via crafted input.\n\nIn Perl/Decoder/srl_decoder.c, srl_read_object() and srl_read_hash() process a COPY tag, a back-reference whose target byte the decoder re-decodes as a fresh tag. When that target byte matches the SHORT_BINARY pattern (an inline string whose length is encoded in the low bits of the tag), the resulting read is not bounded to precede the COPY tag\u0027s own offset and can run past the end of the input buffer. An attacker controlled COPY offset can land inside a previously decoded value rather than on a tag boundary, planting a byte that the decoder reads as a SHORT_BINARY tag and consuming up to 31 following bytes from the heap as a class name (OBJECT path) or hash key (HASH path)."
    },
    {
      "lang": "es",
      "value": "Las versiones de Sereal::Decoder anteriores a la 5.005 para Perl permiten una lectura fuera de l\u00edmites de la memoria din\u00e1mica a trav\u00e9s de una entrada especialmente dise\u00f1ada.\n\nEn Perl/Decoder/srl_decoder.c, srl_read_object() y srl_read_hash() procesan una etiqueta COPY, una retro-referencia cuyo byte objetivo el decodificador vuelve a decodificar como una nueva etiqueta. Cuando ese byte objetivo coincide con el patr\u00f3n SHORT_BINARY (una cadena en l\u00ednea cuya longitud est\u00e1 codificada en los bits bajos de la etiqueta), la lectura resultante no est\u00e1 limitada a preceder el propio desplazamiento de la etiqueta COPY y puede exceder el final del b\u00fafer de entrada. Un desplazamiento COPY controlado por el atacante puede caer dentro de un valor previamente decodificado en lugar de en un l\u00edmite de etiqueta, plantando un byte que el decodificador lee como una etiqueta SHORT_BINARY y consumiendo hasta 31 bytes siguientes de la memoria din\u00e1mica como un nombre de clase (ruta OBJECT) o una clave hash (ruta HASH)."
    }
  ],
  "id": "CVE-2026-8796",
  "lastModified": "2026-07-22T07:10:00.107",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
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          "attackVector": "NETWORK",
          "availabilityImpact": "HIGH",
          "baseScore": 8.1,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "NONE",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "REQUIRED",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:H",
          "version": "3.1"
        },
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        "impactScore": 5.2,
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "type": "Secondary"
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    "ssvcV203": [
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        "ssvcData": {
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          "options": [
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  "references": [
    {
      "source": "9b29abf9-4ab0-4765-b253-1875cd9b441e",
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  "vulnStatus": "Deferred",
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}

GHSA-XHPJ-269V-VQ2Q

Vulnerability from github – Published: 2026-05-31 21:30 – Updated: 2026-06-01 21:30

Details

Sereal::Decoder versions before 5.005 for Perl allow heap out-of-bounds read via crafted input.

In Perl/Decoder/srl_decoder.c, srl_read_object() and srl_read_hash() process a COPY tag, a back-reference whose target byte the decoder re-decodes as a fresh tag. When that target byte matches the SHORT_BINARY pattern (an inline string whose length is encoded in the low bits of the tag), the resulting read is not bounded to precede the COPY tag's own offset and can run past the end of the input buffer. An attacker controlled COPY offset can land inside a previously decoded value rather than on a tag boundary, planting a byte that the decoder reads as a SHORT_BINARY tag and consuming up to 31 following bytes from the heap as a class name (OBJECT path) or hash key (HASH path).

Severity

8.1 (High)


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

Show details on source website

JSON

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{
  "affected": [],
  "aliases": [
    "CVE-2026-8796"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-125"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-05-31T20:16:30Z",
    "severity": "HIGH"
  },
  "details": "Sereal::Decoder versions before 5.005 for Perl allow heap out-of-bounds read via crafted input.\n\nIn Perl/Decoder/srl_decoder.c, srl_read_object() and srl_read_hash() process a COPY tag, a back-reference whose target byte the decoder re-decodes as a fresh tag. When that target byte matches the SHORT_BINARY pattern (an inline string whose length is encoded in the low bits of the tag), the resulting read is not bounded to precede the COPY tag\u0027s own offset and can run past the end of the input buffer. An attacker controlled COPY offset can land inside a previously decoded value rather than on a tag boundary, planting a byte that the decoder reads as a SHORT_BINARY tag and consuming up to 31 following bytes from the heap as a class name (OBJECT path) or hash key (HASH path).",
  "id": "GHSA-xhpj-269v-vq2q",
  "modified": "2026-06-01T21:30:41Z",
  "published": "2026-05-31T21:30:21Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-8796"
    },
    {
      "type": "WEB",
      "url": "https://github.com/Sereal/Sereal/commit/303a2c69cdba80bf37a3ff43461e0aa78198a7a3.patch"
    },
    {
      "type": "WEB",
      "url": "https://metacpan.org/release/YVES/Sereal-Decoder-5.005/changes"
    },
    {
      "type": "WEB",
      "url": "http://www.openwall.com/lists/oss-security/2026/06/01/1"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:H",
      "type": "CVSS_V3"
    }
  ]
}

ubuntu-cve-2026-8796

Vulnerability from osv_ubuntu

Published

2026-05-31 20:16

Modified

2026-06-03 11:20

Summary

Details

Severity

8.1 (High)


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

N/A (UNKNOWN)


                    
                      medium

References

URL

Type

	https://ubuntu.com/security/CVE-2026-8796	REPORT
	https://www.cve.org/CVERecord?id=CVE-2026-8796	REPORT
	https://lists.security.metacpan.org/cve-announce/…	REPORT

JSON

To clipboard

{
  "affected": [
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "libsereal-decoder-perl",
            "binary_version": "3.014-1build1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:16.04:LTS",
        "name": "libsereal-decoder-perl",
        "purl": "pkg:deb/ubuntu/libsereal-decoder-perl@3.014-1build1?arch=source\u0026distro=xenial"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "3.005.001-1",
        "3.006-1",
        "3.008-1",
        "3.014-1",
        "3.014-1build1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "libsereal-decoder-perl",
            "binary_version": "4.005+ds-1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:18.04:LTS",
        "name": "libsereal-decoder-perl",
        "purl": "pkg:deb/ubuntu/libsereal-decoder-perl@4.005+ds-1?arch=source\u0026distro=bionic"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "3.015-1build1",
        "4.004+ds-1",
        "4.005+ds-1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "libsereal-decoder-perl",
            "binary_version": "4.011+ds-1build1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:20.04:LTS",
        "name": "libsereal-decoder-perl",
        "purl": "pkg:deb/ubuntu/libsereal-decoder-perl@4.011+ds-1build1?arch=source\u0026distro=focal"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "4.007+ds-1",
        "4.007+ds-1build1",
        "4.011+ds-1",
        "4.011+ds-1build1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "libsereal-decoder-perl",
            "binary_version": "4.023+ds-1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:22.04:LTS",
        "name": "libsereal-decoder-perl",
        "purl": "pkg:deb/ubuntu/libsereal-decoder-perl@4.023+ds-1?arch=source\u0026distro=jammy"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "4.018+ds-1build1",
        "4.018+ds-1build2",
        "4.023+ds-1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "libsereal-decoder-perl",
            "binary_version": "5.004+ds-1build3"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:24.04:LTS",
        "name": "libsereal-decoder-perl",
        "purl": "pkg:deb/ubuntu/libsereal-decoder-perl@5.004+ds-1build3?arch=source\u0026distro=noble"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "5.004+ds-1",
        "5.004+ds-1build1",
        "5.004+ds-1build2",
        "5.004+ds-1build3"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "libsereal-decoder-perl",
            "binary_version": "5.004+ds-1build5"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:25.10",
        "name": "libsereal-decoder-perl",
        "purl": "pkg:deb/ubuntu/libsereal-decoder-perl@5.004+ds-1build5?arch=source\u0026distro=questing"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "5.004+ds-1build4",
        "5.004+ds-1build5"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "libsereal-decoder-perl",
            "binary_version": "5.004+ds-1build5"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:26.04:LTS",
        "name": "libsereal-decoder-perl",
        "purl": "pkg:deb/ubuntu/libsereal-decoder-perl@5.004+ds-1build5?arch=source\u0026distro=resolute"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "5.004+ds-1build5"
      ]
    }
  ],
  "aliases": [],
  "details": "Sereal::Decoder versions before 5.005 for Perl allow heap out-of-bounds read via crafted input. In Perl/Decoder/srl_decoder.c, srl_read_object() and srl_read_hash() process a COPY tag, a back-reference whose target byte the decoder re-decodes as a fresh tag. When that target byte matches the SHORT_BINARY pattern (an inline string whose length is encoded in the low bits of the tag), the resulting read is not bounded to precede the COPY tag\u0027s own offset and can run past the end of the input buffer. An attacker controlled COPY offset can land inside a previously decoded value rather than on a tag boundary, planting a byte that the decoder reads as a SHORT_BINARY tag and consuming up to 31 following bytes from the heap as a class name (OBJECT path) or hash key (HASH path).",
  "id": "UBUNTU-CVE-2026-8796",
  "modified": "2026-06-03T11:20:10Z",
  "published": "2026-05-31T20:16:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-8796"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-8796"
    },
    {
      "type": "REPORT",
      "url": "https://lists.security.metacpan.org/cve-announce/msg/40571630/"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:H",
      "type": "CVSS_V3"
    },
    {
      "score": "medium",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2026-8796"
  ]
}

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.

Action not permitted

CVE-2026-8796 (GCVE-0-2026-8796)

FKIE_CVE-2026-8796

GHSA-XHPJ-269V-VQ2Q

ubuntu-cve-2026-8796

Vulnerability from osv_ubuntu

Tags

Sightings

Nomenclature