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CVE-2026-45705— OpenSIPS: OOB Read in Multipart Body Boundary Parsing

Quick assessment

Affected
OpenSIPS opensips
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.

OpenSIPS是OpenSIPS组织开源的一个 GPL 许可的 SIP 服务器实现。 OpenSIPS 3.6.6之前版本和4.0.0-rc1之前版本存在缓冲区错误漏洞，该漏洞源于multipart body parser中的find_line_delimiter()函数通过strncmp()搜索MIME边界分隔符时存在越界读取，可能导致越界读取。

CVSS 5.3 · Medium EPSS 0.51% · P41

Possible ATT&CK Techniques 1 AI

T1203 · Exploitation for Client Execution

Affected Version Matrix 2

VendorProduct Version RangeStatus
OpenSIPS opensips >= 3.4.0, < 3.6.6 affected
>= 4.0.0-beta, < 4.0.0-rc1 affected
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I. Basic Information for CVE-2026-45705

Vulnerability Information
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Vulnerability Title
OpenSIPS: OOB Read in Multipart Body Boundary Parsing
Source: CVE Program / CVE List V5
Vulnerability Description
OpenSIPS is a Session Initiation Protocol (SIP) server implementation. In versions prior to 3.6.6 and 4.0.0-rc1, the find_line_delimiter() function in the multipart body parser performs an out-of-bounds read via strncmp() when searching for MIME boundary delimiters. After finding a -- pattern near the end of the body, the function compares delimiter.len bytes (typically 20-70) starting from a position at or past the logical end of the body buffer, reading past the body boundary. The bug triggers when a SIP message has Content-Type: multipart/mixed with a boundary parameter and its body contains -- within two to three bytes of the body's end without being followed by the actual boundary delimiter. This issue has been fixed in versions 3.6.6 and 4.0.0-rc1.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
跨界内存读
Source: CVE Program / CVE List V5
Vulnerability Title
OpenSIPS 缓冲区错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
OpenSIPS是OpenSIPS组织开源的一个 GPL 许可的 SIP 服务器实现。 OpenSIPS 3.6.6之前版本和4.0.0-rc1之前版本存在缓冲区错误漏洞，该漏洞源于multipart body parser中的find_line_delimiter()函数通过strncmp()搜索MIME边界分隔符时存在越界读取，可能导致越界读取。
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
OpenSIPS opensips >= 3.4.0, < 3.6.6 -

II. Public POCs for CVE-2026-45705

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III. Intelligence Information for CVE-2026-45705

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Patches & Fixes for CVE-2026-45705 (2)

Vendor Advisories for CVE-2026-45705 (1)

Same Patch Batch · OpenSIPS · 2026-08-04 · 8 CVEs total

CVE-2026-45538 9.8 CRITICAL OpenSIPS: Stack Buffer Overflow in sip_to_json() Header Name Copy
CVE-2026-45100 9.1 CRITICAL OpenSIPS: Buffer Overflow in Base64 Encode Transformation
CVE-2026-45537 9.1 CRITICAL OpenSIPS: Global Buffer Overflow in construct_uri
CVE-2026-45084 8.7 HIGH OpenSIPS: Denial of service in presence.handle_publish() from unchecked Content-Type state
CVE-2026-45809 8.7 HIGH OpenSIPS: Denial of Service in watcherinfo XML generation from oversized watcher URI
CVE-2026-46334 8.7 HIGH OpenSIPS: Denial of Service in SDP bandwidth parsing via QoS SDP cloning
CVE-2026-45103 7.5 HIGH OpenSIPS: SIP Message Smuggling via TCP Content-Length Integer Overflow

IV. Related Vulnerabilities

Same product: opensips
Same vendor: OpenSIPS
Same weakness: CWE-125

V. Comments for CVE-2026-45705

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