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

Goal: 1000 CNY · Raised: 1359 CNY

100%
Buy Us a Coffee

CVE-2026-45084— OpenSIPS: Denial of service in presence.handle_publish() from unchecked Content-Type state

Quick assessment

Affected
OpenSIPS opensips
Exploitation
Public or AI PoC available; prioritize validation
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 3.4.0版本至3.6.5版本存在异常处理不当漏洞，该漏洞源于presence模块的handle_publish()函数在处理带有Event: presence标头和消息体的SIP PUBLISH请求且配置enable_sphere_check=1时，未先调用parse_content_type_hdr()便调用get_content_type()宏，导致取消引用未初始化或NULL的Content-T

CVSS 8.7 · High EPSS 0.66% · P50

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service

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
Get alerts for future matching vulnerabilities Log in to subscribe

I. Basic Information for CVE-2026-45084

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Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.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
OpenSIPS: Denial of service in presence.handle_publish() from unchecked Content-Type state
Source: CVE Program / CVE List V5
Vulnerability Description
OpenSIPS is a Session Initiation Protocol (SIP) server implementation. Versions 3.4.0 through 3.6.5 contain a denial of service vulnerability in the presence module. When the presence module's handle_publish() function processes a SIP PUBLISH request with an Event: presence header and a message body while the configuration option enable_sphere_check=1 is set, it invokes the get_content_type() macro without first calling parse_content_type_hdr(), causing it to dereference uninitialized or NULL Content-Type parsing state and crash. If a Content-Type header is present but unparsed, msg->content_type->parsed is NULL and is dereferenced as a content_t pointer; if the request lacks a Content-Type header entirely, msg->content_type itself is NULL, and both cases lead to a crash. A remote attacker can therefore cause a denial of service against an affected instance with a single PUBLISH request over UDP or TCP, using either a valid Content-Type: application/pidf+xml request or one with the header removed, and the vulnerable code path itself does not enforce authentication (though a deployment's routing configuration may require it before this route is reached). The issue has been fixed in version 3.6.6 and 4.0.0-rc1.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
空指针解引用
Source: CVE Program / CVE List V5
Vulnerability Title
OpenSIPS 异常处理不当漏洞
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 3.4.0版本至3.6.5版本存在异常处理不当漏洞，该漏洞源于presence模块的handle_publish()函数在处理带有Event: presence标头和消息体的SIP PUBLISH请求且配置enable_sphere_check=1时，未先调用parse_content_type_hdr()便调用get_content_type()宏，导致取消引用未初始化或NULL的Content-T
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-2026-45084

# POC Description Source Link Shenlong Link
AI-Generated POC Premium
Qwen3.6-35B-A3B · 7497 chars
Pro+ exclusive includes:
Vulnerability reproduction recording (real sandbox build + trigger, exclusive)
In-depth vulnerability mechanism
Trigger conditions & impact
Full executable POC code
Exploit chain & mitigation
POC zip download
100+ AI POC generations per month

III. Intelligence Information for CVE-2026-45084

请登录查看更多情报信息。

Vendor Advisories for CVE-2026-45084 (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-2026-45809 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
CVE-2026-45705 5.3 MEDIUM OpenSIPS: OOB Read in Multipart Body Boundary Parsing

IV. Related Vulnerabilities

Same product: opensips
Same vendor: OpenSIPS
Same weakness: CWE-476

V. Comments for CVE-2026-45084

No comments yet

Leave a comment