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CVE-2026-124747— Busybox: heap buffer overflow in wget ftp resume when the resume offset exceeds the reported file size

Quick assessment

Affected
Red Hat Red Hat Enterprise Linux 6
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.

BusyBox 中存在一个漏洞：在使用 File Transfer Protocol (FTP) 恢复下载时，wget 工具未能验证恢复偏移量是否超过了服务器报告的文件大小，从而导致整数计算错误。恶意的 FTP 服务器或处于通信路径上的网络攻击者可通过返回精心构造的文件大小元数据来利用此问题，引发由攻击者控制数据触发的堆缓冲区溢出。成功利用该漏洞可能允许攻击者执行任意代码或导致应用程序崩溃，进而造成拒绝服务（DoS）。

CVSS 7.5 · High
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I. Basic Information for CVE-2026-124747

Vulnerability Information
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Vulnerability Title
Busybox: heap buffer overflow in wget ftp resume when the resume offset exceeds the reported file size
Source: CVE Program / CVE List V5
Vulnerability Description
A flaw was found in BusyBox. When resuming a download over File Transfer Protocol (FTP), the wget utility fails to verify that the resume offset does not exceed the file size reported by the server, resulting in an integer calculation error. A malicious FTP server or an on-path network attacker can exploit this issue by returning crafted file size metadata, triggering a heap-based buffer overflow with attacker-controlled data. Successful exploitation may allow an attacker to execute arbitrary code or crash the application, resulting in a denial of service (DoS).
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
跨界内存写
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Red Hat Red Hat Enterprise Linux 6 - cpe:/o:redhat:rhel_els:6
Red Hat Red Hat Hardened Images - cpe:/a:redhat:hummingbird:1

II. Public POCs for CVE-2026-124747

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III. Intelligence Information for CVE-2026-124747

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Other References for CVE-2026-124747 (2)

Same Patch Batch · Red Hat · 2026-11-10 · 11 CVEs total

CVE-2026-120399 7.5 HIGH Flightctl-api: flightctl-remote-access: flightctl: unbounded tls handshake in conncontext
CVE-2026-125712 7.5 HIGH Gst-plugins-base: gst-plugins-base: missing bounds checks in rtcp sdes packet parsing
CVE-2026-125704 7.5 HIGH Gstreamer: gstreamer: use-after-free in gstreamer core buffer value deserialization
CVE-2026-125652 6.8 MEDIUM Keycloak-services: keycloak-services: client-level mandatory pkce bypass via login-actions
CVE-2026-125672 6.6 MEDIUM Cockpit: cockpit-storaged: tang keyserver address from an untrusted luks header clevis tok
CVE-2026-121885 6.5 MEDIUM Podman: untrusted image labels allow auto-update to restart arbitrary systemd units
CVE-2026-125707 6.1 MEDIUM Gst-plugins-bad: gst-plugins-bad: off-by-one write in mxf demuxer temporal offset table
CVE-2026-125706 5.5 MEDIUM Gst-plugins-bad: gst-plugins-bad: missing bounds checks in mpeg ps pes header parsing
CVE-2026-125703 5.5 MEDIUM Gst-plugins-bad: gst-plugins-bad: bounds check errors in mxf vanc packet handling
CVE-2026-125709 4.2 MEDIUM Libstdc++: overflow leaves streambuf in inconsistent state on i/o error.

IV. Related Vulnerabilities

Same product: Red Hat Enterprise Linux 6
Same vendor: Red Hat
Same weakness: CWE-787