CVE-2026-11850— Krb5: krb5: integer underflow in berval2tl_data() leads to heap out-of-bounds read
Possible ATT&CK Techniques 2AI
T1210 · Exploitation of Remote Services T1068 · Exploitation for Privilege EscalationAffected Version Matrix 7
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| Red Hat | Red Hat Enterprise Linux 10 | any | affected |
| Red Hat | Red Hat Enterprise Linux 6 | any | affected |
| Red Hat | Red Hat Enterprise Linux 7 | any | affected |
| Red Hat | Red Hat Enterprise Linux 8 | any | affected |
| Red Hat | Red Hat Enterprise Linux 9 | any | affected |
| Red Hat | Red Hat Hardened Images | 1.22.2-8.hum1< * | unaffected |
| Red Hat | Red Hat OpenShift Container Platform 4 | any | affected |
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I. Basic Information for CVE-2026-11850
Vulnerability Information
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Vulnerability Title
Krb5: krb5: integer underflow in berval2tl_data() leads to heap out-of-bounds read
Source: NVD (National Vulnerability Database)
Vulnerability Description
An integer underflow vulnerability was found in MIT krb5 in the berval2tl_data() function in plugins/kdb/ldap/libkdb_ldap/ldap_principal2.c. The function performs an unsigned subtraction (bv_len - 2) without a prior bounds check. When bv_len is 0 or 1, the subtraction wraps to a large value which is then truncated to uint16_t, yielding 0xFFFE (65534) or 0xFFFF (65535). The subsequent malloc succeeds and memcpy reads up to 65534 bytes from a 0-1 byte buffer, resulting in a heap out-of-bounds read. The attack vector involves a malicious or compromised LDAP KDB backend returning a krbExtraData attribute with bv_len < 2, triggering the underflow when the KDC or kadmind reads principal data.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:L/I:N/A:H
Source: NVD (National Vulnerability Database)
Vulnerability Type
整数下溢(超界折返)
Source: NVD (National Vulnerability Database)
Vulnerability Title
MIT krb5 数字错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
MIT krb5（MIT Kerberos 5）是美国麻省理工（Massachusetts Institute Of Technology）大学的一套网络认证协议，它采用客户端/服务器结构，并且客户端和服务器端均可对对方进行身份认证（即双重验证），可防止窃听、防止replay攻击等。 MIT krb5存在数字错误漏洞，该漏洞源于berval2tl_data()函数中整数下溢，未进行边界检查的无符号减法导致后续malloc成功并读取超出缓冲区数据，可能导致堆越界读取。
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 |
|---|---|---|---|---|
| Red Hat | Red Hat Hardened Images | 1.22.2-8.hum1 ~ * | cpe:/a:redhat:hummingbird:1 | |
| 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 | |
| Red Hat | Red Hat OpenShift Container Platform 4 | - | cpe:/a:redhat:openshift:4 |
II. Public POCs for CVE-2026-11850
| # | POC Description | Source Link | Shenlong Link |
|---|
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Vendor Advisories for CVE-2026-11850 (3)
Same Patch Batch · Red Hat · 2026-06-11 · 5 CVEs total
| CVE-2026-11774 | 7.6 HIGH | 389-ds-base: 389-ds-base: integer overflow in sasl packet length bypasses size limit leadi |
| CVE-2026-53701 | 6.5 MEDIUM | Gstreamer1-plugins-bad-free: gstreamer: out-of-bounds write in h.266/vvc pps picture parti |
| CVE-2026-53702 | 6.5 MEDIUM | Gstreamer1-plugins-bad-free: gstreamer: stack buffer overflow in h.265 buffering period se |
| CVE-2026-11986 | 4.9 MEDIUM | Keycloak-rest-admin-ui-ext: authorization bypass vulnerability in the admin-ui-ext bulk ro |
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V. Comments for CVE-2026-11850
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