Goal Reached Thanks to every supporter — we hit 100%!

Goal: 1000 CNY · Raised: 1336 CNY

100%
Buy Us a Coffee

CVE-2026-12549— Libsoup: incomplete fix for cve-2026-2443: range suffix overflow in libsoup soupserver

Quick assessment

Affected
Red Hat Red Hat Enterprise Linux 10
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.

GNOME libsoup是GNOME基金会开源的一款GNOME的HTTP客户端/服务器库。 GNOME libsoup存在缓冲区错误漏洞，该漏洞源于缓冲区错误，当客户端发送后缀长度超过内容大小的Range请求时，生成的负起始值未正确限制，导致格式错误的HTTP 206响应和日志洪泛。

CVSS 4.8 · Medium EPSS 0.41% · P34

Affected Version Matrix 5

VendorProduct Version RangeStatus
Red Hat Red Hat Enterprise Linux 10 any affected
Red Hat Red Hat Enterprise Linux 6 any unknown
Red Hat Red Hat Enterprise Linux 7 any unknown
Red Hat Red Hat Enterprise Linux 8 any affected
Red Hat Red Hat Enterprise Linux 9 any affected
Get alerts for future matching vulnerabilities Log in to subscribe

I. Basic Information for CVE-2026-12549

Vulnerability Information
Have questions about the vulnerability? See if Shenlong's analysis helps!
View Shenlong Deep Dive ↗

Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.

Vulnerability Title
Libsoup: incomplete fix for cve-2026-2443: range suffix overflow in libsoup soupserver
Source: CVE Program / CVE List V5
Vulnerability Description
The fix for CVE-2026-2443 was regressed by a subsequent rework commit that replaced specific overflow checks with a general signed comparison. When a client sends a Range request with a suffix length exceeding the content size, the resulting negative start value is not properly clamped, leading to malformed HTTP 206 responses and log flooding.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
使用不正确的长度值访问缓冲区
Source: CVE Program / CVE List V5
Vulnerability Title
GNOME libsoup 缓冲区错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
GNOME libsoup是GNOME基金会开源的一款GNOME的HTTP客户端/服务器库。 GNOME libsoup存在缓冲区错误漏洞，该漏洞源于缓冲区错误，当客户端发送后缀长度超过内容大小的Range请求时，生成的负起始值未正确限制，导致格式错误的HTTP 206响应和日志洪泛。
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
Red Hat Red Hat Enterprise Linux 10 - cpe:/o:redhat:enterprise_linux:10
Red Hat Red Hat Enterprise Linux 6 - cpe:/o:redhat:enterprise_linux:6
Red Hat Red Hat Enterprise Linux 7 - cpe:/o:redhat:enterprise_linux:7
Red Hat Red Hat Enterprise Linux 8 - cpe:/o:redhat:enterprise_linux:8
Red Hat Red Hat Enterprise Linux 9 - cpe:/o:redhat:enterprise_linux:9

II. Public POCs for CVE-2026-12549

# POC Description Source Link Shenlong Link
AI-Generated POC Premium

No public POC found.

Login to generate AI POC

III. Intelligence Information for CVE-2026-12549

请登录查看更多情报信息。

Vendor Advisories for CVE-2026-12549 (3)

Other References for CVE-2026-12549 (1)

Same Patch Batch · Red Hat · 2026-06-22 · 4 CVEs total

CVE-2026-54099 8.8 HIGH Windows-machine-config-operator: windows-machine-config-operator: wicd csr extra-organizat
CVE-2026-54100 8.3 HIGH Windows-machine-config-operator: windows-machine-config-operator: ssh host key not verifie
CVE-2026-12725 5.9 MEDIUM Dnsmasq: dnsmasq: heap buffer overflow in log_query() when logging unsupported ds/dnskey r

IV. Related Vulnerabilities

Same product: Red Hat Enterprise Linux 10
Same vendor: Red Hat
Same weakness: CWE-805

V. Comments for CVE-2026-12549

No comments yet

Leave a comment