Vulnerability-Lookup

OPENSUSE-SU-2026:12420-1

Vulnerability from csaf_opensuse - Published: 2026-11-04 00:00 - Updated: 2026-11-06 11:26

Summary

libsixel-bash-completion-1.10.5-3.1 on GA media

Severity

Moderate

Notes

Title of the patch: libsixel-bash-completion-1.10.5-3.1 on GA media

Description of the patch: These are all security issues fixed in the libsixel-bash-completion-1.10.5-3.1 package on the GA media of openSUSE Tumbleweed.

Patchnames: openSUSE-Tumbleweed-2026-12420

CVE-2026-33023

7.8 (High)


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

Affected products

Recommended 20 products

Product	Version	Remediation
Unresolved product id: openSUSE Tumbleweed:libsixel-bash-completion-0:1.10.5-3.1.aarch64	—	Vendor Fix
Unresolved product id: openSUSE Tumbleweed:libsixel-bash-completion-0:1.10.5-3.1.ppc64le	—	Vendor Fix
Unresolved product id: openSUSE Tumbleweed:libsixel-bash-completion-0:1.10.5-3.1.s390x	—	Vendor Fix
Unresolved product id: openSUSE Tumbleweed:libsixel-bash-completion-0:1.10.5-3.1.x86_64	—	Vendor Fix
Unresolved product id: openSUSE Tumbleweed:libsixel-devel-0:1.10.5-3.1.aarch64	—	Vendor Fix
Unresolved product id: openSUSE Tumbleweed:libsixel-devel-0:1.10.5-3.1.ppc64le	—	Vendor Fix
Unresolved product id: openSUSE Tumbleweed:libsixel-devel-0:1.10.5-3.1.s390x	—	Vendor Fix
Unresolved product id: openSUSE Tumbleweed:libsixel-devel-0:1.10.5-3.1.x86_64	—	Vendor Fix
Unresolved product id: openSUSE Tumbleweed:libsixel-utils-0:1.10.5-3.1.aarch64	—	Vendor Fix
Unresolved product id: openSUSE Tumbleweed:libsixel-utils-0:1.10.5-3.1.ppc64le	—	Vendor Fix
Unresolved product id: openSUSE Tumbleweed:libsixel-utils-0:1.10.5-3.1.s390x	—	Vendor Fix
Unresolved product id: openSUSE Tumbleweed:libsixel-utils-0:1.10.5-3.1.x86_64	—	Vendor Fix
Unresolved product id: openSUSE Tumbleweed:libsixel-zsh-completion-0:1.10.5-3.1.aarch64	—	Vendor Fix
Unresolved product id: openSUSE Tumbleweed:libsixel-zsh-completion-0:1.10.5-3.1.ppc64le	—	Vendor Fix
Unresolved product id: openSUSE Tumbleweed:libsixel-zsh-completion-0:1.10.5-3.1.s390x	—	Vendor Fix
Unresolved product id: openSUSE Tumbleweed:libsixel-zsh-completion-0:1.10.5-3.1.x86_64	—	Vendor Fix
Unresolved product id: openSUSE Tumbleweed:libsixel1-0:1.10.5-3.1.aarch64	—	Vendor Fix
Unresolved product id: openSUSE Tumbleweed:libsixel1-0:1.10.5-3.1.ppc64le	—	Vendor Fix
Unresolved product id: openSUSE Tumbleweed:libsixel1-0:1.10.5-3.1.s390x	—	Vendor Fix
Unresolved product id: openSUSE Tumbleweed:libsixel1-0:1.10.5-3.1.x86_64	—	Vendor Fix

Threats

Impact important

CVE-2026-44636

7.4 (High)


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

Affected products

Recommended 20 products, the same list as for CVE-2026-33023

Threats

Impact important

CVE-2026-44637

7.1 (High)


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

Affected products

Recommended 20 products, the same list as for CVE-2026-33023

Threats

Impact important

CVE-2026-44638

2.5 (Low)


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

Affected products

Recommended 20 products, the same list as for CVE-2026-33023

Threats

Impact low

References

14 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-2026-33023/	self
https://www.suse.com/security/cve/CVE-2026-44636/	self
https://www.suse.com/security/cve/CVE-2026-44637/	self
https://www.suse.com/security/cve/CVE-2026-44638/	self
https://www.suse.com/security/cve/CVE-2026-33023	external
https://bugzilla.suse.com/1262127	external
https://www.suse.com/security/cve/CVE-2026-44636	external
https://bugzilla.suse.com/1265313	external
https://www.suse.com/security/cve/CVE-2026-44637	external
https://bugzilla.suse.com/1265314	external
https://www.suse.com/security/cve/CVE-2026-44638	external
https://bugzilla.suse.com/1265315	external

JSON

To clipboard

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      "references": [
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          "summary": "CVE-2026-44637",
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        {
          "category": "external",
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          "date": "2026-11-04T00:00:00Z",
          "details": "important"
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      ],
      "title": "CVE-2026-44637"
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      "cve": "CVE-2026-44638",
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          "text": "https://www.suse.com/security/cve/CVE-2026-44638"
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      ],
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        {
          "category": "general",
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          "title": "CVE description"
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          "category": "impact",
          "date": "2026-11-04T00:00:00Z",
          "details": "low"
        }
      ],
      "title": "CVE-2026-44638"
    }
  ]
}

CVE-2026-33023 (GCVE-0-2026-33023)

Vulnerability from cvelistv5 – Published: 2026-04-14 22:05 – Updated: 2026-04-15 20:02

Title

libsixel: Use-after-free in load_with_gdkpixbuf()

Summary

libsixel is a SIXEL encoder/decoder implementation derived from kmiya's sixel. In versions 1.8.7 and prior, when built with the --with-gdk-pixbuf2 option, a use-after-free vulnerability exists in load_with_gdkpixbuf() in loader.c. The cleanup path manually frees the sixel_frame_t object and its internal buffers without consulting the reference count, even though the object was created via the refcounted constructor sixel_frame_new() and exposed to the public callback. A callback that calls sixel_frame_ref(frame) to retain a logically valid reference will hold a dangling pointer after sixel_helper_load_image_file() returns, and any subsequent access to the frame or its fields triggers a use-after-free confirmed by AddressSanitizer. The root cause is a consistency failure between two cleanup strategies in the same codebase: sixel_frame_unref() is used in load_with_builtin() but raw free() is used in load_with_gdkpixbuf(). An attacker supplying a crafted image to any application built against libsixel with gdk-pixbuf2 support can trigger this reliably, potentially leading to information disclosure, memory corruption, or code execution. This issue has been fixed in version 1.8.7-r1.

Severity

7.8 (High)


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

SSVC

Exploitation: poc Automatable: no Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-04-15 18:48 UTC

CWE

CWE-416 - Use After Free

Assigner

GitHub_M CNA under the mitre root

CNA scorecard C 72/100 over 7868 records in the last 180 days details

References

2 references

URL	Tags
https://github.com/saitoha/libsixel/security/advi…	x_refsource_CONFIRM
https://github.com/saitoha/libsixel/releases/tag/…	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version
saitoha	libsixel	Affected: < 1.8.7-r1

Show details on NVD website

JSON

To clipboard

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CVE-2026-44636 (GCVE-0-2026-44636)

Vulnerability from cvelistv5 – Published: 2026-05-14 20:01 – Updated: 2026-05-16 03:56

Title

libsixel: integer overflow in encoder

Summary

libsixel is a SIXEL encoder/decoder implementation derived from kmiya's sixel. From to 1.8.7-r1, signed integer overflow in sixel_encode_highcolor's allocation size calculation can lead to a heap buffer overflow. The public sixel_encode entry point validates only that width and height are greater than zero, with no upper bound. width and height are multiplied as plain int when computing the allocation size for paletted_pixels and normalized_pixels. Any caller that asks libsixel to encode a pixel buffer with width times height greater than INT_MAX (about 2.15 billion) will hit a wrapped allocation size; under the right wrap, the malloc succeeds with a buffer much smaller than the encoder expects, and the encoder writes past the end of the heap allocation. This vulnerability is fixed in 1.8.7-r2.

Severity

7.4 (High)


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

SSVC

Exploitation: poc Automatable: no Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-05-15 00:00 UTC

CWE

CWE-122 - Heap-based Buffer Overflow
CWE-190 - Integer Overflow or Wraparound

Assigner

GitHub_M CNA under the mitre root

CNA scorecard C 72/100 over 7868 records in the last 180 days details

References

1 reference

URL	Tags
https://github.com/saitoha/libsixel/security/advi…	x_refsource_CONFIRM

Impacted products

1 product

Vendor	Product	Version
saitoha	libsixel	Affected: >= 1.4.4, < 1.8.7-r2

Show details on NVD website

JSON

To clipboard

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          "dateUpdated": "2026-05-16T03:56:20.840Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
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            "tags": [
              "exploit"
            ],
            "url": "https://github.com/saitoha/libsixel/security/advisories/GHSA-hx93-w8p2-ffh5"
          }
        ],
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "libsixel",
          "vendor": "saitoha",
          "versions": [
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              "status": "affected",
              "version": "\u003e= 1.4.4, \u003c 1.8.7-r2"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "libsixel is a SIXEL encoder/decoder implementation derived from kmiya\u0027s sixel. From  to 1.8.7-r1, signed integer overflow in sixel_encode_highcolor\u0027s allocation size calculation can lead to a heap buffer overflow. The public sixel_encode entry point validates only that width and height are greater than zero, with no upper bound. width and height are multiplied as plain int when computing the allocation size for paletted_pixels and normalized_pixels. Any caller that asks libsixel to encode a pixel buffer with width times height greater than INT_MAX (about 2.15 billion) will hit a wrapped allocation size; under the right wrap, the malloc succeeds with a buffer much smaller than the encoder expects, and the encoder writes past the end of the heap allocation. This vulnerability is fixed in 1.8.7-r2."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "HIGH",
            "attackVector": "LOCAL",
            "availabilityImpact": "HIGH",
            "baseScore": 7.4,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-122",
              "description": "CWE-122: Heap-based Buffer Overflow",
              "lang": "en",
              "type": "CWE"
            }
          ]
        },
        {
          "descriptions": [
            {
              "cweId": "CWE-190",
              "description": "CWE-190: Integer Overflow or Wraparound",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
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        "dateUpdated": "2026-05-14T20:01:27.050Z",
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          ],
          "url": "https://github.com/saitoha/libsixel/security/advisories/GHSA-hx93-w8p2-ffh5"
        }
      ],
      "source": {
        "advisory": "GHSA-hx93-w8p2-ffh5",
        "discovery": "UNKNOWN"
      },
      "title": "libsixel: integer overflow in encoder"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
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  },
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}

CVE-2026-44637 (GCVE-0-2026-44637)

Vulnerability from cvelistv5 – Published: 2026-05-14 20:02 – Updated: 2026-05-15 13:35

Title

libsixel: integer overflow in parser

Summary

libsixel is a SIXEL encoder/decoder implementation derived from kmiya's sixel. From to 1.8.7-r1, a signed integer overflow in the SIXEL parser's image-buffer doubling loop can lead to an out-of-bounds heap write in sixel_decode_raw_impl. context->pos_x grows by repeat_count on every sixel character with no upper bound check. Once pos_x approaches INT_MAX, the expression "pos_x + repeat_count" used to size the image buffer overflows signed int. Depending on how the overflow wraps, the resize check that should reject oversized buffers can be bypassed, after which a subsequent write computes a large attacker-influenced offset into image->data and writes past the allocation. Reachable from any caller that decodes attacker-supplied SIXEL data, including img2sixel. This vulnerability is fixed in 1.8.7-r2.

Severity

7.1 (High)


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

SSVC

Exploitation: poc Automatable: no Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-05-15 13:35 UTC

CWE

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

Assigner

GitHub_M CNA under the mitre root

CNA scorecard C 72/100 over 7868 records in the last 180 days details

References

1 reference

URL	Tags
https://github.com/saitoha/libsixel/security/advi…	x_refsource_CONFIRM

Impacted products

1 product

Vendor	Product	Version
saitoha	libsixel	Affected: >= 0.11.0, < 1.8.7-r2

Show details on NVD website

JSON

To clipboard

{
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        "metrics": [
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                "id": "CVE-2026-44637",
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        {
          "lang": "en",
          "value": "libsixel is a SIXEL encoder/decoder implementation derived from kmiya\u0027s sixel. From  to 1.8.7-r1, a signed integer overflow in the SIXEL parser\u0027s image-buffer doubling loop can lead to an out-of-bounds heap write in sixel_decode_raw_impl. context-\u003epos_x grows by repeat_count on every sixel character with no upper bound check. Once pos_x approaches INT_MAX, the expression \"pos_x + repeat_count\" used to size the image buffer overflows signed int. Depending on how the overflow wraps, the resize check that should reject oversized buffers can be bypassed, after which a subsequent write computes a large attacker-influenced offset into image-\u003edata and writes past the allocation. Reachable from any caller that decodes attacker-supplied SIXEL data, including img2sixel. This vulnerability is fixed in 1.8.7-r2."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "LOW",
            "attackVector": "LOCAL",
            "availabilityImpact": "HIGH",
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            "confidentialityImpact": "NONE",
            "integrityImpact": "HIGH",
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              "lang": "en",
              "type": "CWE"
            }
          ]
        },
        {
          "descriptions": [
            {
              "cweId": "CWE-787",
              "description": "CWE-787: Out-of-bounds Write",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
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CVE-2026-44638 (GCVE-0-2026-44638)

Vulnerability from cvelistv5 – Published: 2026-05-14 19:59 – Updated: 2026-05-15 14:18

Title

libsixel: NULL pointer dereference

Summary

libsixel is a SIXEL encoder/decoder implementation derived from kmiya's sixel. From to 1.8.7-r1, a wrong NULL check after an allocation call in sixel_decode_raw and sixel_decode causes a NULL pointer dereference whenever the allocation fails. The check tests the address of the output parameter (always non-NULL) instead of the value the malloc returned. On allocation failure, the function continues and writes through a NULL pointer, crashing the process. This is a denial of service against any caller of these public APIs that hits a low-memory condition. This vulnerability is fixed in 1.8.7-r2.

Severity

2.5 (Low)


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

SSVC

Exploitation: poc Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-05-15 14:17 UTC

CWE

CWE-476 - NULL Pointer Dereference
CWE-690 - Unchecked Return Value to NULL Pointer Dereference

Assigner

GitHub_M CNA under the mitre root

CNA scorecard C 72/100 over 7868 records in the last 180 days details

References

1 reference

URL	Tags
https://github.com/saitoha/libsixel/security/advi…	x_refsource_CONFIRM

Impacted products

1 product

Vendor	Product	Version
saitoha	libsixel	Affected: >= 1.0.0, < 1.8.7-r2

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
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                "id": "CVE-2026-44638",
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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

Order JSON

How durations are calculated

Following the VTEM framework (Black Hat USA 2015), time to patch starts when the vendor or a coordinator was informed, total time to patch at discovery, and disclosure to patch at public disclosure; vendor response time runs from the report to its acknowledgement. Time to exploit and time unpatched start at the earliest discovery or report, falling back to public disclosure. Unpatched time ends at the first recorded patch, or the calculation time when no patch is recorded. Exploitation to patch shows the interval between those two events; a published proof of concept is a public exploit, not exploitation.

Each result shows its source dates. A negative interval means the end event came first; when date-only inputs leave the order open, the result says so. Date-only inputs are approximate. The earliest evidence wins: KEV report dates and sightings are labelled as such. Records describing another vulnerability are listed but never calculated from, and a PoC alone does not establish exploitation. Missing patch evidence does not prove that no patch exists. Filters below change the event list only.

Publication & reservation Sightings KEV catalogs Other timestamps

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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.

Action not permitted

OPENSUSE-SU-2026:12420-1

CVE-2026-33023 (GCVE-0-2026-33023)

CVE-2026-44636 (GCVE-0-2026-44636)

CVE-2026-44637 (GCVE-0-2026-44637)

CVE-2026-44638 (GCVE-0-2026-44638)

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