CVE-2026-23943— Pre-auth SSH DoS via unbounded zlib inflate
Get alerts for future matching vulnerabilitiesLog in to subscribe
I. Basic Information for CVE-2026-23943
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View Shenlong Deep Dive ↗ Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.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
Pre-auth SSH DoS via unbounded zlib inflate
Source: NVD (National Vulnerability Database)
Vulnerability Description
Improper Handling of Highly Compressed Data (Compression Bomb) vulnerability in Erlang OTP ssh (ssh_transport modules) allows Denial of Service via Resource Depletion. The SSH transport layer advertises legacy zlib compression by default and inflates attacker-controlled payloads pre-authentication without any size limit, enabling reliable memory exhaustion DoS. Two compression algorithms are affected: * zlib: Activates immediately after key exchange, enabling unauthenticated attacks * zlib@openssh.com: Activates post-authentication, enabling authenticated attacks Each SSH packet can decompress ~255 MB from 256 KB of wire data (1029:1 amplification ratio). Multiple packets can rapidly exhaust available memory, causing OOM kills in memory-constrained environments. This vulnerability is associated with program files lib/ssh/src/ssh_transport.erl and program routines ssh_transport:decompress/2, ssh_transport:handle_packet_part/4. This issue affects OTP from OTP 17.0 until OTP 28.4.1, 27.3.4.9 and 26.2.5.18 corresponding to ssh from 3.0.1 until 5.5.1, 5.2.11.6 and 5.1.4.14.
Source: NVD (National Vulnerability Database)
CVSS Information
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Type
对高度压缩数据的处理不恰当(数据放大攻击)
Source: NVD (National Vulnerability Database)
Vulnerability Title
Erlang/OTP 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Erlang/OTP是Erlang/OTP开源的一个JavaScript编写的处理处理异常的库。该库可以捕捉node.js内置API引发的异常。 Erlang/OTP 17.0至28.4.1版本、27.3.4.9版本和26.2.5.18版本存在安全漏洞，该漏洞源于对高压缩数据处理不当，可能导致通过资源耗尽进行拒绝服务攻击。
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
II. Public POCs for CVE-2026-23943
| # | POC Description | Source Link | Shenlong Link |
|---|
AI-Generated POCPremium
No public POC found.
Login to generate AI POCIII. Intelligence Information for CVE-2026-23943
请登录查看更多情报信息。
Same Patch Batch · Erlang · 2026-03-13 · 3 CVEs total
| CVE-2026-23942 | SFTP root escape via component-agnostic prefix check in ssh_sftpd | |
| CVE-2026-23941 | Request smuggling via first-wins Content-Length parsing in inets httpd |
IV. Related Vulnerabilities
Same product: OTP
- CVE-2026-32147
SFTP chroot bypass via path traversal in SSH_FXP_FSETSTAT - CVE-2026-28808
ScriptAlias CGI targets bypass directory auth in inets httpd - CVE-2026-32144
OCSP designated-responder authorization bypass via missing s - CVE-2026-28810
Predictable DNS Transaction IDs Enable Cache Poisoning in Bu - CVE-2026-23941
Request smuggling via first-wins Content-Length parsing in i
Same vendor: Erlang
- CVE-2026-32147
SFTP chroot bypass via path traversal in SSH_FXP_FSETSTAT - CVE-2026-28808
ScriptAlias CGI targets bypass directory auth in inets httpd - CVE-2026-32144
OCSP designated-responder authorization bypass via missing s - CVE-2026-28810
Predictable DNS Transaction IDs Enable Cache Poisoning in Bu - CVE-2026-23941
Request smuggling via first-wins Content-Length parsing in i
Same weakness: CWE-409
- CVE-2026-27460
Tandoor Recipes Affected by Denial of Service via Recipe Imp - CVE-2026-40148
PraisonAI Affected by Decompression Bomb DoS via Recipe Bund - CVE-2026-39373
JWCrypto: JWE ZIP decompression bomb - CVE-2026-3114
Zip Bomb Denial of Service via Unrestricted Archive Decompre - CVE-2026-32044
OpenClaw < 2026.3.2 - Tar Archive Safety Bypass in Skills In
V. Comments for CVE-2026-23943
No comments yet