CVE-2026-44637 Vulnerability Analysis & Exploit Details

CVE-2026-44637
Vulnerability Scoring

7.1
/10
Very High Risk

Highly exploitable, CVE-2026-44637 poses a critical security risk that could lead to severe breaches.

Attack Complexity Details

  • Attack Complexity: Low
    Exploits can be performed without significant complexity or special conditions.
  • Attack Vector: Local
    Vulnerability requires local system access.
  • Privileges Required: None
    No privileges are required for exploitation.
  • Scope: Unchanged
    Exploit remains within the originally vulnerable component.
  • User Interaction: Required
    User interaction is necessary for successful exploitation.

CVE-2026-44637 Details

Status: Analyzed

Last updated: 🕠 15 May 2026, 17:55 UTC
Originally published on: 🕗 14 May 2026, 20:17 UTC

CVSS Release: version 3

CVSS3 Source

security-advisories@github.com

CVSS3 Type

Secondary

CVSS3 Vector

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

CVE-2026-44637 Vulnerability Summary

CVE-2026-44637: 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.

Assessing the Risk of CVE-2026-44637

Access Complexity Graph

The exploitability of CVE-2026-44637 depends on two key factors: attack complexity (the level of effort required to execute an exploit) and privileges required (the access level an attacker needs).

Exploitability Analysis for CVE-2026-44637

With low attack complexity and no required privileges, CVE-2026-44637 is an easy target for cybercriminals. Organizations should prioritize immediate mitigation measures to prevent unauthorized access and data breaches.

Understanding AC and PR

A lower complexity and fewer privilege requirements make exploitation easier. Security teams should evaluate these aspects to determine the urgency of mitigation strategies, such as patch management and access control policies.

Attack Complexity (AC) measures the difficulty in executing an exploit. A high AC means that specific conditions must be met, making an attack more challenging, while a low AC means the vulnerability can be exploited with minimal effort.

Privileges Required (PR) determine the level of system access necessary for an attack. Vulnerabilities requiring no privileges are more accessible to attackers, whereas high privilege requirements limit exploitation to authorized users with elevated access.

CVSS Score Breakdown Chart

Above is the CVSS Sub-score Breakdown for CVE-2026-44637, illustrating how Base, Impact, and Exploitability factors combine to form the overall severity rating. A higher sub-score typically indicates a more severe or easier-to-exploit vulnerability.

CIA Impact Analysis

Below is the Impact Analysis for CVE-2026-44637, showing how Confidentiality, Integrity, and Availability might be affected if the vulnerability is exploited. Higher values usually signal greater potential damage.

  • Confidentiality: None
    CVE-2026-44637 has no significant impact on data confidentiality.
  • Integrity: High
    CVE-2026-44637 could allow unauthorized modifications to data, potentially affecting system reliability and trust.
  • Availability: High
    CVE-2026-44637 can disrupt system operations, potentially causing complete denial of service (DoS).

CVE-2026-44637 References

External References

CWE Common Weakness Enumeration

CWE-787

Vulnerable Configurations

  • cpe:2.3:a:saitoha:libsixel:0.11.0:*:*:*:*:*:*:*
    cpe:2.3:a:saitoha:libsixel:0.11.0:*:*:*:*:*:*:*
  • cpe:2.3:a:saitoha:libsixel:0.12.0:*:*:*:*:*:*:*
    cpe:2.3:a:saitoha:libsixel:0.12.0:*:*:*:*:*:*:*
  • cpe:2.3:a:saitoha:libsixel:0.14.0:*:*:*:*:*:*:*
    cpe:2.3:a:saitoha:libsixel:0.14.0:*:*:*:*:*:*:*
  • cpe:2.3:a:saitoha:libsixel:0.15.0:*:*:*:*:*:*:*
    cpe:2.3:a:saitoha:libsixel:0.15.0:*:*:*:*:*:*:*
  • cpe:2.3:a:saitoha:libsixel:0.16.0:*:*:*:*:*:*:*
    cpe:2.3:a:saitoha:libsixel:0.16.0:*:*:*:*:*:*:*
  • cpe:2.3:a:saitoha:libsixel:0.16.1:*:*:*:*:*:*:*
    cpe:2.3:a:saitoha:libsixel:0.16.1:*:*:*:*:*:*:*
  • cpe:2.3:a:saitoha:libsixel:0.17.0:*:*:*:*:*:*:*
    cpe:2.3:a:saitoha:libsixel:0.17.0:*:*:*:*:*:*:*
  • cpe:2.3:a:saitoha:libsixel:0.17.1:*:*:*:*:*:*:*
    cpe:2.3:a:saitoha:libsixel:0.17.1:*:*:*:*:*:*:*
  • cpe:2.3:a:saitoha:libsixel:0.17.2:*:*:*:*:*:*:*
    cpe:2.3:a:saitoha:libsixel:0.17.2:*:*:*:*:*:*:*
  • cpe:2.3:a:saitoha:libsixel:0.18.0:*:*:*:*:*:*:*
    cpe:2.3:a:saitoha:libsixel:0.18.0:*:*:*:*:*:*:*
  • cpe:2.3:a:saitoha:libsixel:0.19.0:*:*:*:*:*:*:*
    cpe:2.3:a:saitoha:libsixel:0.19.0:*:*:*:*:*:*:*
  • cpe:2.3:a:saitoha:libsixel:0.19.1:*:*:*:*:*:*:*
    cpe:2.3:a:saitoha:libsixel:0.19.1:*:*:*:*:*:*:*
  • cpe:2.3:a:saitoha:libsixel:0.19.2:*:*:*:*:*:*:*
    cpe:2.3:a:saitoha:libsixel:0.19.2:*:*:*:*:*:*:*
  • cpe:2.3:a:saitoha:libsixel:0.19.3:*:*:*:*:*:*:*
    cpe:2.3:a:saitoha:libsixel:0.19.3:*:*:*:*:*:*:*
  • cpe:2.3:a:saitoha:libsixel:0.19.4:*:*:*:*:*:*:*
    cpe:2.3:a:saitoha:libsixel:0.19.4:*:*:*:*:*:*:*
  • cpe:2.3:a:saitoha:libsixel:0.19.5:*:*:*:*:*:*:*
    cpe:2.3:a:saitoha:libsixel:0.19.5:*:*:*:*:*:*:*
  • cpe:2.3:a:saitoha:libsixel:0.19.6:*:*:*:*:*:*:*
    cpe:2.3:a:saitoha:libsixel:0.19.6:*:*:*:*:*:*:*
  • cpe:2.3:a:saitoha:libsixel:0.20.0:*:*:*:*:*:*:*
    cpe:2.3:a:saitoha:libsixel:0.20.0:*:*:*:*:*:*:*
  • cpe:2.3:a:saitoha:libsixel:0.21.0:*:*:*:*:*:*:*
    cpe:2.3:a:saitoha:libsixel:0.21.0:*:*:*:*:*:*:*
  • cpe:2.3:a:saitoha:libsixel:0.21.1:*:*:*:*:*:*:*
    cpe:2.3:a:saitoha:libsixel:0.21.1:*:*:*:*:*:*:*
  • cpe:2.3:a:saitoha:libsixel:0.22.0:*:*:*:*:*:*:*
    cpe:2.3:a:saitoha:libsixel:0.22.0:*:*:*:*:*:*:*
  • cpe:2.3:a:saitoha:libsixel:0.22.1:*:*:*:*:*:*:*
    cpe:2.3:a:saitoha:libsixel:0.22.1:*:*:*:*:*:*:*
  • cpe:2.3:a:saitoha:libsixel:0.22.2:*:*:*:*:*:*:*
    cpe:2.3:a:saitoha:libsixel:0.22.2:*:*:*:*:*:*:*
  • cpe:2.3:a:saitoha:libsixel:0.22.3:*:*:*:*:*:*:*
    cpe:2.3:a:saitoha:libsixel:0.22.3:*:*:*:*:*:*:*
  • cpe:2.3:a:saitoha:libsixel:0.23.0:*:*:*:*:*:*:*
    cpe:2.3:a:saitoha:libsixel:0.23.0:*:*:*:*:*:*:*
  • cpe:2.3:a:saitoha:libsixel:0.23.1:*:*:*:*:*:*:*
    cpe:2.3:a:saitoha:libsixel:0.23.1:*:*:*:*:*:*:*
  • cpe:2.3:a:saitoha:libsixel:0.23.2:*:*:*:*:*:*:*
    cpe:2.3:a:saitoha:libsixel:0.23.2:*:*:*:*:*:*:*
  • cpe:2.3:a:saitoha:libsixel:0.24.0:*:*:*:*:*:*:*
    cpe:2.3:a:saitoha:libsixel:0.24.0:*:*:*:*:*:*:*
  • cpe:2.3:a:saitoha:libsixel:0.24.2:*:*:*:*:*:*:*
    cpe:2.3:a:saitoha:libsixel:0.24.2:*:*:*:*:*:*:*
  • cpe:2.3:a:saitoha:libsixel:0.25.0:*:*:*:*:*:*:*
    cpe:2.3:a:saitoha:libsixel:0.25.0:*:*:*:*:*:*:*
  • cpe:2.3:a:saitoha:libsixel:0.25.1:*:*:*:*:*:*:*
    cpe:2.3:a:saitoha:libsixel:0.25.1:*:*:*:*:*:*:*
  • cpe:2.3:a:saitoha:libsixel:0.25.2:*:*:*:*:*:*:*
    cpe:2.3:a:saitoha:libsixel:0.25.2:*:*:*:*:*:*:*
  • cpe:2.3:a:saitoha:libsixel:0.25.3:*:*:*:*:*:*:*
    cpe:2.3:a:saitoha:libsixel:0.25.3:*:*:*:*:*:*:*
  • cpe:2.3:a:saitoha:libsixel:0.25.4:*:*:*:*:*:*:*
    cpe:2.3:a:saitoha:libsixel:0.25.4:*:*:*:*:*:*:*
  • cpe:2.3:a:saitoha:libsixel:0.25.5:*:*:*:*:*:*:*
    cpe:2.3:a:saitoha:libsixel:0.25.5:*:*:*:*:*:*:*
  • cpe:2.3:a:saitoha:libsixel:0.26.0:*:*:*:*:*:*:*
    cpe:2.3:a:saitoha:libsixel:0.26.0:*:*:*:*:*:*:*
  • cpe:2.3:a:saitoha:libsixel:0.27.0:*:*:*:*:*:*:*
    cpe:2.3:a:saitoha:libsixel:0.27.0:*:*:*:*:*:*:*
  • cpe:2.3:a:saitoha:libsixel:0.27.1:*:*:*:*:*:*:*
    cpe:2.3:a:saitoha:libsixel:0.27.1:*:*:*:*:*:*:*
  • cpe:2.3:a:saitoha:libsixel:0.28.0:*:*:*:*:*:*:*
    cpe:2.3:a:saitoha:libsixel:0.28.0:*:*:*:*:*:*:*
  • cpe:2.3:a:saitoha:libsixel:1.0.0:*:*:*:*:*:*:*
    cpe:2.3:a:saitoha:libsixel:1.0.0:*:*:*:*:*:*:*
  • cpe:2.3:a:saitoha:libsixel:1.0.1:*:*:*:*:*:*:*
    cpe:2.3:a:saitoha:libsixel:1.0.1:*:*:*:*:*:*:*
  • cpe:2.3:a:saitoha:libsixel:1.0.2:*:*:*:*:*:*:*
    cpe:2.3:a:saitoha:libsixel:1.0.2:*:*:*:*:*:*:*
  • cpe:2.3:a:saitoha:libsixel:1.0.3:*:*:*:*:*:*:*
    cpe:2.3:a:saitoha:libsixel:1.0.3:*:*:*:*:*:*:*
  • cpe:2.3:a:saitoha:libsixel:1.1.0:*:*:*:*:*:*:*
    cpe:2.3:a:saitoha:libsixel:1.1.0:*:*:*:*:*:*:*
  • cpe:2.3:a:saitoha:libsixel:1.1.1:*:*:*:*:*:*:*
    cpe:2.3:a:saitoha:libsixel:1.1.1:*:*:*:*:*:*:*
  • cpe:2.3:a:saitoha:libsixel:1.1.2:*:*:*:*:*:*:*
    cpe:2.3:a:saitoha:libsixel:1.1.2:*:*:*:*:*:*:*
  • cpe:2.3:a:saitoha:libsixel:1.1.3:*:*:*:*:*:*:*
    cpe:2.3:a:saitoha:libsixel:1.1.3:*:*:*:*:*:*:*
  • cpe:2.3:a:saitoha:libsixel:1.1.4:*:*:*:*:*:*:*
    cpe:2.3:a:saitoha:libsixel:1.1.4:*:*:*:*:*:*:*
  • cpe:2.3:a:saitoha:libsixel:1.1.5:*:*:*:*:*:*:*
    cpe:2.3:a:saitoha:libsixel:1.1.5:*:*:*:*:*:*:*
  • cpe:2.3:a:saitoha:libsixel:1.2.0:*:*:*:*:*:*:*
    cpe:2.3:a:saitoha:libsixel:1.2.0:*:*:*:*:*:*:*
  • cpe:2.3:a:saitoha:libsixel:1.2.1:*:*:*:*:*:*:*
    cpe:2.3:a:saitoha:libsixel:1.2.1:*:*:*:*:*:*:*
  • cpe:2.3:a:saitoha:libsixel:1.2.2:*:*:*:*:*:*:*
    cpe:2.3:a:saitoha:libsixel:1.2.2:*:*:*:*:*:*:*
  • cpe:2.3:a:saitoha:libsixel:1.2.3:*:*:*:*:*:*:*
    cpe:2.3:a:saitoha:libsixel:1.2.3:*:*:*:*:*:*:*
  • cpe:2.3:a:saitoha:libsixel:1.3.0:*:*:*:*:*:*:*
    cpe:2.3:a:saitoha:libsixel:1.3.0:*:*:*:*:*:*:*
  • cpe:2.3:a:saitoha:libsixel:1.3.1:*:*:*:*:*:*:*
    cpe:2.3:a:saitoha:libsixel:1.3.1:*:*:*:*:*:*:*
  • cpe:2.3:a:saitoha:libsixel:1.3.2:*:*:*:*:*:*:*
    cpe:2.3:a:saitoha:libsixel:1.3.2:*:*:*:*:*:*:*
  • cpe:2.3:a:saitoha:libsixel:1.3.3:*:*:*:*:*:*:*
    cpe:2.3:a:saitoha:libsixel:1.3.3:*:*:*:*:*:*:*
  • cpe:2.3:a:saitoha:libsixel:1.3.4:*:*:*:*:*:*:*
    cpe:2.3:a:saitoha:libsixel:1.3.4:*:*:*:*:*:*:*
  • cpe:2.3:a:saitoha:libsixel:1.3.5:*:*:*:*:*:*:*
    cpe:2.3:a:saitoha:libsixel:1.3.5:*:*:*:*:*:*:*
  • cpe:2.3:a:saitoha:libsixel:1.3.6:*:*:*:*:*:*:*
    cpe:2.3:a:saitoha:libsixel:1.3.6:*:*:*:*:*:*:*
  • cpe:2.3:a:saitoha:libsixel:1.4.0:*:*:*:*:*:*:*
    cpe:2.3:a:saitoha:libsixel:1.4.0:*:*:*:*:*:*:*
  • cpe:2.3:a:saitoha:libsixel:1.4.1:*:*:*:*:*:*:*
    cpe:2.3:a:saitoha:libsixel:1.4.1:*:*:*:*:*:*:*
  • cpe:2.3:a:saitoha:libsixel:1.4.2:*:*:*:*:*:*:*
    cpe:2.3:a:saitoha:libsixel:1.4.2:*:*:*:*:*:*:*
  • cpe:2.3:a:saitoha:libsixel:1.4.3:*:*:*:*:*:*:*
    cpe:2.3:a:saitoha:libsixel:1.4.3:*:*:*:*:*:*:*
  • cpe:2.3:a:saitoha:libsixel:1.4.4:*:*:*:*:*:*:*
    cpe:2.3:a:saitoha:libsixel:1.4.4:*:*:*:*:*:*:*
  • cpe:2.3:a:saitoha:libsixel:1.4.5:*:*:*:*:*:*:*
    cpe:2.3:a:saitoha:libsixel:1.4.5:*:*:*:*:*:*:*
  • cpe:2.3:a:saitoha:libsixel:1.4.6:*:*:*:*:*:*:*
    cpe:2.3:a:saitoha:libsixel:1.4.6:*:*:*:*:*:*:*
  • cpe:2.3:a:saitoha:libsixel:1.4.7:*:*:*:*:*:*:*
    cpe:2.3:a:saitoha:libsixel:1.4.7:*:*:*:*:*:*:*
  • cpe:2.3:a:saitoha:libsixel:1.4.8:*:*:*:*:*:*:*
    cpe:2.3:a:saitoha:libsixel:1.4.8:*:*:*:*:*:*:*
  • cpe:2.3:a:saitoha:libsixel:1.4.9:*:*:*:*:*:*:*
    cpe:2.3:a:saitoha:libsixel:1.4.9:*:*:*:*:*:*:*
  • cpe:2.3:a:saitoha:libsixel:1.4.10:*:*:*:*:*:*:*
    cpe:2.3:a:saitoha:libsixel:1.4.10:*:*:*:*:*:*:*
  • cpe:2.3:a:saitoha:libsixel:1.4.11:*:*:*:*:*:*:*
    cpe:2.3:a:saitoha:libsixel:1.4.11:*:*:*:*:*:*:*
  • cpe:2.3:a:saitoha:libsixel:1.4.12:*:*:*:*:*:*:*
    cpe:2.3:a:saitoha:libsixel:1.4.12:*:*:*:*:*:*:*
  • cpe:2.3:a:saitoha:libsixel:1.4.13:*:*:*:*:*:*:*
    cpe:2.3:a:saitoha:libsixel:1.4.13:*:*:*:*:*:*:*
  • cpe:2.3:a:saitoha:libsixel:1.5.0:*:*:*:*:*:*:*
    cpe:2.3:a:saitoha:libsixel:1.5.0:*:*:*:*:*:*:*
  • cpe:2.3:a:saitoha:libsixel:1.5.1:*:*:*:*:*:*:*
    cpe:2.3:a:saitoha:libsixel:1.5.1:*:*:*:*:*:*:*
  • cpe:2.3:a:saitoha:libsixel:1.5.2:*:*:*:*:*:*:*
    cpe:2.3:a:saitoha:libsixel:1.5.2:*:*:*:*:*:*:*
  • cpe:2.3:a:saitoha:libsixel:1.5.3:*:*:*:*:*:*:*
    cpe:2.3:a:saitoha:libsixel:1.5.3:*:*:*:*:*:*:*
  • cpe:2.3:a:saitoha:libsixel:1.6.0:*:*:*:*:*:*:*
    cpe:2.3:a:saitoha:libsixel:1.6.0:*:*:*:*:*:*:*
  • cpe:2.3:a:saitoha:libsixel:1.6.1:*:*:*:*:*:*:*
    cpe:2.3:a:saitoha:libsixel:1.6.1:*:*:*:*:*:*:*
  • cpe:2.3:a:saitoha:libsixel:1.7.0:*:*:*:*:*:*:*
    cpe:2.3:a:saitoha:libsixel:1.7.0:*:*:*:*:*:*:*
  • cpe:2.3:a:saitoha:libsixel:1.7.1:*:*:*:*:*:*:*
    cpe:2.3:a:saitoha:libsixel:1.7.1:*:*:*:*:*:*:*
  • cpe:2.3:a:saitoha:libsixel:1.7.2:*:*:*:*:*:*:*
    cpe:2.3:a:saitoha:libsixel:1.7.2:*:*:*:*:*:*:*
  • cpe:2.3:a:saitoha:libsixel:1.7.3:*:*:*:*:*:*:*
    cpe:2.3:a:saitoha:libsixel:1.7.3:*:*:*:*:*:*:*
  • cpe:2.3:a:saitoha:libsixel:1.8.0:*:*:*:*:*:*:*
    cpe:2.3:a:saitoha:libsixel:1.8.0:*:*:*:*:*:*:*
  • cpe:2.3:a:saitoha:libsixel:1.8.1:*:*:*:*:*:*:*
    cpe:2.3:a:saitoha:libsixel:1.8.1:*:*:*:*:*:*:*
  • cpe:2.3:a:saitoha:libsixel:1.8.2:*:*:*:*:*:*:*
    cpe:2.3:a:saitoha:libsixel:1.8.2:*:*:*:*:*:*:*
  • cpe:2.3:a:saitoha:libsixel:1.8.3:*:*:*:*:*:*:*
    cpe:2.3:a:saitoha:libsixel:1.8.3:*:*:*:*:*:*:*
  • cpe:2.3:a:saitoha:libsixel:1.8.4:*:*:*:*:*:*:*
    cpe:2.3:a:saitoha:libsixel:1.8.4:*:*:*:*:*:*:*
  • cpe:2.3:a:saitoha:libsixel:1.8.5:*:*:*:*:*:*:*
    cpe:2.3:a:saitoha:libsixel:1.8.5:*:*:*:*:*:*:*
  • cpe:2.3:a:saitoha:libsixel:1.8.6:*:*:*:*:*:*:*
    cpe:2.3:a:saitoha:libsixel:1.8.6:*:*:*:*:*:*:*
  • cpe:2.3:a:saitoha:libsixel:1.8.7:*:*:*:*:*:*:*
    cpe:2.3:a:saitoha:libsixel:1.8.7:*:*:*:*:*:*:*
  • cpe:2.3:a:saitoha:libsixel:1.8.7-r1:*:*:*:*:*:*:*
    cpe:2.3:a:saitoha:libsixel:1.8.7-r1:*:*:*:*:*:*:*

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