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CVE-2026-42046— libcaca: Heap OOB write in canvas import functions caused by int overflow

Quick assessment

Affected
cacalabs libcaca
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

libcaca是cacalabs开源的一个软件库。可将图像转换为彩色ASCII艺术品。 libcaca 0.99.beta20及之前版本存在安全漏洞，该漏洞源于画布导入功能中的整数溢出，可能导致攻击者通过提供特制的caca格式文件造成堆越界写入，进而导致内存损坏或远程代码执行。

CVSS 7.8 · High EPSS 0.22% · P13

Affected Version Matrix 1

VendorProduct Version RangeStatus
cacalabs libcaca <= 0.99.beta20 affected
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I. Basic Information for CVE-2026-42046

Vulnerability Information
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Vulnerability Title
libcaca: Heap OOB write in canvas import functions caused by int overflow
Source: CVE Program / CVE List V5
Vulnerability Description
libcaca is a colour ASCII art library. In 0.99.beta20 and earlier, an integer overflow vulnerability in libcaca's canvas import functionality allows an attacker to cause a controlled heap out-of-bounds write (heap overflow) by supplying a crafted file in the "caca" format. Depending on the build configuration and memory allocator, this may lead to memory corruption or remote code execution. This is the same vulnerability as CVE-2021-3410 but the fix at that time was not fully correct. Commit fb77acff9ba6bb01d53940da34fb10f20b156a23 fixes this vulnerability.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
堆缓冲区溢出
Source: CVE Program / CVE List V5
Vulnerability Title
libcaca 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
libcaca是cacalabs开源的一个软件库。可将图像转换为彩色ASCII艺术品。 libcaca 0.99.beta20及之前版本存在安全漏洞，该漏洞源于画布导入功能中的整数溢出，可能导致攻击者通过提供特制的caca格式文件造成堆越界写入，进而导致内存损坏或远程代码执行。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
cacalabs libcaca <= 0.99.beta20 -

II. Public POCs for CVE-2026-42046

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III. Intelligence Information for CVE-2026-42046

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Patches & Fixes for CVE-2026-42046 (1)

Vendor Advisories for CVE-2026-42046 (1)

Other References for CVE-2026-42046 (1)

IV. Related Vulnerabilities

Same product: libcaca
Same weakness: CWE-122

V. Comments for CVE-2026-42046

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