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

Goal: 1000 CNY · Raised: 1359 CNY

100%
Buy Us a Coffee

CVE-2026-39944— Ceph: CephX AES Authentication error

Quick assessment

Affected
ceph ceph
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.

Ceph是Ceph社区开源的一款分布式存储系统。 Ceph 20.2.4之前版本和19.2.6之前版本存在加密问题漏洞，该漏洞源于RADOS Gateway (RGW)使用AES-128-CBC保护STS会话令牌且未提供消息认证，允许持有有效STS令牌的攻击者篡改令牌中的acct_type、perm_type和is_admin字段，伪造is_admin值触发全局管理覆盖，绕过所有能力检查，可能导致远程升级至RGW完全管理权限。

CVSS 8.8 · High EPSS 0.29% · P20

Affected Version Matrix 2

VendorProduct Version RangeStatus
ceph ceph >= 19.0.0, < 19.2.6 affected
>= 20.0.0, < 20.2.4 affected
Get alerts for future matching vulnerabilities Log in to subscribe

I. Basic Information for CVE-2026-39944

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Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.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
Ceph: CephX AES Authentication error
Source: CVE Program / CVE List V5
Vulnerability Description
Ceph is an open-source distributed storage platform providing object, block, and file storage. In versions prior to 20.2.4 and 19.2.6, the RADOS Gateway (RGW) protects STS session tokens with an AES-128-CBC handler that provides no message authentication, allowing an attacker who holds any valid STS token to tamper with it undetected and escalate to full RGW administrative access. Because the ciphertext is unauthenticated, the attacker can perform a CBC bit-flip on the acct_type, perm_type, and is_admin fields of their own token, and a forged is_admin value triggers a global administrative override that bypasses all capability checks. The attack is reachable remotely over the RGW S3 endpoint and is a self-contained modification of a token the attacker already possesses, requiring no encryption oracle and no network observation. It requires only a single valid STS token, which need not carry any elevated privileges, with STS enabled. This issue is fixed in versions 20.2.4 and 19.2.6.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
使用已被攻破或存在风险的密码学算法
Source: CVE Program / CVE List V5
Vulnerability Title
Ceph 加密问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Ceph是Ceph社区开源的一款分布式存储系统。 Ceph 20.2.4之前版本和19.2.6之前版本存在加密问题漏洞，该漏洞源于RADOS Gateway (RGW)使用AES-128-CBC保护STS会话令牌且未提供消息认证，允许持有有效STS令牌的攻击者篡改令牌中的acct_type、perm_type和is_admin字段，伪造is_admin值触发全局管理覆盖，绕过所有能力检查，可能导致远程升级至RGW完全管理权限。
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
ceph ceph >= 19.0.0, < 19.2.6 -

II. Public POCs for CVE-2026-39944

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

No public POC found.

Login to generate AI POC

III. Intelligence Information for CVE-2026-39944

请登录查看更多情报信息。

Vendor Advisories for CVE-2026-39944 (1)

Vendor Pages for CVE-2026-39944 (2)

Same Patch Batch · ceph · 2026-08-27 · 4 CVEs total

CVE-2026-50152 9.1 CRITICAL Ceph Monitor subscription handler improperly authorizes config-key store reads, exposing c
CVE-2025-30156 8.9 HIGH Ceph: AES-CBC misuse in CephX and RADOSGW enables authentication bypass and credential for
CVE-2026-54330 8.1 HIGH Ceph RGW SigV4 handler accepts unsigned x-amz-* headers on presigned requests, allowing pr

IV. Related Vulnerabilities

Same product: ceph
Same vendor: ceph
Same weakness: CWE-327

V. Comments for CVE-2026-39944

No comments yet

Leave a comment