Vulnerability-Lookup

alsa-2026:6445

Vulnerability from osv_almalinux

Published

2026-04-02 00:00

Modified

2026-04-03 12:13

Summary

Important: libpng12 security update

Details

The libpng12 package provides libpng 1.2, which is the previous version of the libpng library for manipulating PNG (Portable Network Graphics) image format files. This version should be used in case that it is not possible to use the current version of libpng.

Security Fix(es):

libpng: LIBPNG has a heap buffer overflow in png_set_quantize (CVE-2026-25646)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

References

URL

Type

	https://access.redhat.com/errata/RHSA-2026:6445	ADVISORY
	https://access.redhat.com/security/cve/CVE-2026-25646	REPORT
	https://bugzilla.redhat.com/2438542	REPORT
	https://errata.almalinux.org/8/ALSA-2026-6445.html	ADVISORY

JSON

To clipboard

{
  "affected": [
    {
      "package": {
        "ecosystem": "AlmaLinux:8",
        "name": "libpng12"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1.2.57-6.el8_10"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "details": "The libpng12 package provides libpng 1.2, which is the previous version of the libpng library for manipulating PNG (Portable Network Graphics) image format files. This version should be used in case that it is not possible to use the current version of libpng.  \n\nSecurity Fix(es):  \n\n  * libpng: LIBPNG has a heap buffer overflow in png_set_quantize (CVE-2026-25646)\n\n\nFor more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.\n",
  "id": "ALSA-2026:6445",
  "modified": "2026-04-03T12:13:28Z",
  "published": "2026-04-02T00:00:00Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://access.redhat.com/errata/RHSA-2026:6445"
    },
    {
      "type": "REPORT",
      "url": "https://access.redhat.com/security/cve/CVE-2026-25646"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/2438542"
    },
    {
      "type": "ADVISORY",
      "url": "https://errata.almalinux.org/8/ALSA-2026-6445.html"
    }
  ],
  "related": [
    "CVE-2026-25646"
  ],
  "summary": "Important: libpng12 security update"
}

CVE-2026-25646 (GCVE-0-2026-25646)

Vulnerability from cvelistv5 – Published: 2026-02-10 17:04 – Updated: 2026-02-11 15:31

Title

LIBPNG has a heap buffer overflow in png_set_quantize

Summary

LIBPNG is a reference library for use in applications that read, create, and manipulate PNG (Portable Network Graphics) raster image files. Prior to 1.6.55, an out-of-bounds read vulnerability exists in the png_set_quantize() API function. When the function is called with no histogram and the number of colors in the palette is more than twice the maximum supported by the user's display, certain palettes will cause the function to enter into an infinite loop that reads past the end of an internal heap-allocated buffer. The images that trigger this vulnerability are valid per the PNG specification. This vulnerability is fixed in 1.6.55.

Severity ?

8.3 (High)


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

CWE

CWE-122 - Heap-based Buffer Overflow
CWE-126 - Buffer Over-read

Assigner

GitHub_M

References

URL

Tags

	https://github.com/pnggroup/libpng/security/advis…	x_refsource_CONFIRM
	https://github.com/pnggroup/libpng/commit/01d03b8…	x_refsource_MISC

Impacted products

	Vendor	Product	Version
	pnggroup	libpng	Affected: < 1.6.55

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "providerMetadata": {
          "dateUpdated": "2026-02-10T17:25:31.583Z",
          "orgId": "af854a3a-2127-422b-91ae-364da2661108",
          "shortName": "CVE"
        },
        "references": [
          {
            "url": "http://www.openwall.com/lists/oss-security/2026/02/09/7"
          }
        ],
        "title": "CVE Program Container"
      },
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-25646",
                "options": [
                  {
                    "Exploitation": "poc"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-02-11T15:31:50.552532Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-02-11T15:31:58.665Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "references": [
          {
            "tags": [
              "exploit"
            ],
            "url": "https://github.com/pnggroup/libpng/security/advisories/GHSA-g8hp-mq4h-rqm3"
          }
        ],
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "libpng",
          "vendor": "pnggroup",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 1.6.55"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "LIBPNG is a reference library for use in applications that read, create, and manipulate PNG (Portable Network Graphics) raster image files. Prior to 1.6.55, an out-of-bounds read vulnerability exists in the png_set_quantize() API function. When the function is called with no histogram and the number of colors in the palette is more than twice the maximum supported by the user\u0027s display, certain palettes will cause the function to enter into an infinite loop that reads past the end of an internal heap-allocated buffer. The images that trigger this vulnerability are valid per the PNG specification. This vulnerability is fixed in 1.6.55."
        }
      ],
      "metrics": [
        {
          "cvssV4_0": {
            "attackComplexity": "HIGH",
            "attackRequirements": "PRESENT",
            "attackVector": "NETWORK",
            "baseScore": 8.3,
            "baseSeverity": "HIGH",
            "privilegesRequired": "NONE",
            "subAvailabilityImpact": "NONE",
            "subConfidentialityImpact": "NONE",
            "subIntegrityImpact": "NONE",
            "userInteraction": "NONE",
            "vectorString": "CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:L/VI:L/VA:H/SC:N/SI:N/SA:N",
            "version": "4.0",
            "vulnAvailabilityImpact": "HIGH",
            "vulnConfidentialityImpact": "LOW",
            "vulnIntegrityImpact": "LOW"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-122",
              "description": "CWE-122: Heap-based Buffer Overflow",
              "lang": "en",
              "type": "CWE"
            }
          ]
        },
        {
          "descriptions": [
            {
              "cweId": "CWE-126",
              "description": "CWE-126: Buffer Over-read",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-02-10T17:04:38.501Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "name": "https://github.com/pnggroup/libpng/security/advisories/GHSA-g8hp-mq4h-rqm3",
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/pnggroup/libpng/security/advisories/GHSA-g8hp-mq4h-rqm3"
        },
        {
          "name": "https://github.com/pnggroup/libpng/commit/01d03b8453eb30ade759cd45c707e5a1c7277d88",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/pnggroup/libpng/commit/01d03b8453eb30ade759cd45c707e5a1c7277d88"
        }
      ],
      "source": {
        "advisory": "GHSA-g8hp-mq4h-rqm3",
        "discovery": "UNKNOWN"
      },
      "title": "LIBPNG has a heap buffer overflow in png_set_quantize"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-25646",
    "datePublished": "2026-02-10T17:04:38.501Z",
    "dateReserved": "2026-02-04T05:15:41.791Z",
    "dateUpdated": "2026-02-11T15:31:58.665Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date

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.

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