CVE-2026-11850
krb5-admin-server: An integer underflow vulnerability was found in MIT krb5 in the berval2tl_data() function in plugins/kdb/ldap/libkdb_...
CVE-2026-11850 is fixed in 37 products on 1 platform, first by krb5-admin-server 1.19.2-2ubuntu0.8, released June 11, 2026. It is not reported as exploited. Patch Radar priority: Routine.
Routine
CVSS
5.0
Medium
Exploitation
None reported
No vendor assessment
CISA KEV
Not listed
Not in the Known Exploited Vulnerabilities catalog
EPSS
0.0027
19th percentile
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.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| krb5 · Debian 14 | 1.22.1-3 | DEBIAN-CVE-2026-11850 | Jun 25, 2026 |
| krb5 · opensuse-leap 16.0 | 1.21.3-160000.4.1 | OPENSUSE-SU-2026:21238-1 | Jul 5, 2026 |
| krb5 · sles 15.6 | 1.20.1-150600.11.19.1 | SUSE-SU-2026:2848-1 | Jul 10, 2026 |
| krb5 · sles 15.7 | 1.20.1-150600.11.19.1 | SUSE-SU-2026:2848-1 | Jul 10, 2026 |
| krb5-admin-server · Ubuntu 22.04.1 LTS (jammy) | 1.19.2-2ubuntu0.8 | krb5-admin-server 1.19.2-2ubuntu0.8 | Jun 11, 2026 |
| krb5-admin-server · Ubuntu 24.04.5 LTS (noble) | 1.20.1-6ubuntu2.7 | krb5-admin-server 1.20.1-6ubuntu2.7 | Jun 11, 2026 |
| krb5-admin-server · Ubuntu 26.04.1 LTS (resolute) | 1.22.1-2ubuntu4.1 | krb5-admin-server 1.22.1-2ubuntu4.1 | Jun 11, 2026 |
| krb5-debuginfo · amzn 2023 | 1.21.3-8.amzn2023.0.1 | ALAS2023-2026-1939 | Jul 20, 2026 |
| krb5-debugsource · amzn 2023 | 1.21.3-8.amzn2023.0.1 | ALAS2023-2026-1939 | Jul 20, 2026 |
| krb5-devel · amzn 2023 | 1.21.3-8.amzn2023.0.1 | ALAS2023-2026-1939 | Jul 20, 2026 |
| krb5-gss-samples · Ubuntu 22.04.1 LTS (jammy) | 1.19.2-2ubuntu0.8 | krb5-gss-samples 1.19.2-2ubuntu0.8 | Jun 11, 2026 |
| krb5-gss-samples · Ubuntu 24.04.5 LTS (noble) | 1.20.1-6ubuntu2.7 | krb5-gss-samples 1.20.1-6ubuntu2.7 | Jun 11, 2026 |
| krb5-gss-samples · Ubuntu 26.04.1 LTS (resolute) | 1.22.1-2ubuntu4.1 | krb5-gss-samples 1.22.1-2ubuntu4.1 | Jun 11, 2026 |
| krb5-k5tls · Ubuntu 22.04.1 LTS (jammy) | 1.19.2-2ubuntu0.8 | krb5-k5tls 1.19.2-2ubuntu0.8 | Jun 11, 2026 |
| krb5-k5tls · Ubuntu 24.04.5 LTS (noble) | 1.20.1-6ubuntu2.7 | krb5-k5tls 1.20.1-6ubuntu2.7 | Jun 11, 2026 |
| krb5-k5tls · Ubuntu 26.04.1 LTS (resolute) | 1.22.1-2ubuntu4.1 | krb5-k5tls 1.22.1-2ubuntu4.1 | Jun 11, 2026 |
| krb5-kdc · Ubuntu 22.04.1 LTS (jammy) | 1.19.2-2ubuntu0.8 | krb5-kdc 1.19.2-2ubuntu0.8 | Jun 11, 2026 |
| krb5-kdc · Ubuntu 24.04.5 LTS (noble) | 1.20.1-6ubuntu2.7 | krb5-kdc 1.20.1-6ubuntu2.7 | Jun 11, 2026 |
| krb5-kdc · Ubuntu 26.04.1 LTS (resolute) | 1.22.1-2ubuntu4.1 | krb5-kdc 1.22.1-2ubuntu4.1 | Jun 11, 2026 |
| krb5-kdc-ldap · Ubuntu 22.04.1 LTS (jammy) | 1.19.2-2ubuntu0.8 | krb5-kdc-ldap 1.19.2-2ubuntu0.8 | Jun 11, 2026 |
| krb5-kdc-ldap · Ubuntu 24.04.5 LTS (noble) | 1.20.1-6ubuntu2.7 | krb5-kdc-ldap 1.20.1-6ubuntu2.7 | Jun 11, 2026 |
| krb5-kdc-ldap · Ubuntu 26.04.1 LTS (resolute) | 1.22.1-2ubuntu4.1 | krb5-kdc-ldap 1.22.1-2ubuntu4.1 | Jun 11, 2026 |
| krb5-kpropd · Ubuntu 22.04.1 LTS (jammy) | 1.19.2-2ubuntu0.8 | krb5-kpropd 1.19.2-2ubuntu0.8 | Jun 11, 2026 |
| krb5-kpropd · Ubuntu 24.04.5 LTS (noble) | 1.20.1-6ubuntu2.7 | krb5-kpropd 1.20.1-6ubuntu2.7 | Jun 11, 2026 |
| krb5-kpropd · Ubuntu 26.04.1 LTS (resolute) | 1.22.1-2ubuntu4.1 | krb5-kpropd 1.22.1-2ubuntu4.1 | Jun 11, 2026 |
| krb5-libs · amzn 2023 | 1.21.3-8.amzn2023.0.1 | ALAS2023-2026-1939 | Jul 20, 2026 |
| krb5-libs-debuginfo · amzn 2023 | 1.21.3-8.amzn2023.0.1 | ALAS2023-2026-1939 | Jul 20, 2026 |
| krb5-locales · Ubuntu 22.04.1 LTS (jammy) | 1.19.2-2ubuntu0.8 | krb5-locales 1.19.2-2ubuntu0.8 | Jun 11, 2026 |
| krb5-locales · Ubuntu 24.04.5 LTS (noble) | 1.20.1-6ubuntu2.7 | krb5-locales 1.20.1-6ubuntu2.7 | Jun 11, 2026 |
| krb5-locales · Ubuntu 26.04.1 LTS (resolute) | 1.22.1-2ubuntu4.1 | krb5-locales 1.22.1-2ubuntu4.1 | Jun 11, 2026 |
| krb5-multidev · Ubuntu 22.04.1 LTS (jammy) | 1.19.2-2ubuntu0.8 | krb5-multidev 1.19.2-2ubuntu0.8 | Jun 11, 2026 |
| krb5-multidev · Ubuntu 24.04.5 LTS (noble) | 1.20.1-6ubuntu2.7 | krb5-multidev 1.20.1-6ubuntu2.7 | Jun 11, 2026 |
| krb5-multidev · Ubuntu 26.04.1 LTS (resolute) | 1.22.1-2ubuntu4.1 | krb5-multidev 1.22.1-2ubuntu4.1 | Jun 11, 2026 |
| krb5-otp · Ubuntu 22.04.1 LTS (jammy) | 1.19.2-2ubuntu0.8 | krb5-otp 1.19.2-2ubuntu0.8 | Jun 11, 2026 |
| krb5-otp · Ubuntu 24.04.5 LTS (noble) | 1.20.1-6ubuntu2.7 | krb5-otp 1.20.1-6ubuntu2.7 | Jun 11, 2026 |
| krb5-otp · Ubuntu 26.04.1 LTS (resolute) | 1.22.1-2ubuntu4.1 | krb5-otp 1.22.1-2ubuntu4.1 | Jun 11, 2026 |
| krb5-pkinit · Ubuntu 22.04.1 LTS (jammy) | 1.19.2-2ubuntu0.8 | krb5-pkinit 1.19.2-2ubuntu0.8 | Jun 11, 2026 |
| krb5-pkinit · Ubuntu 24.04.5 LTS (noble) | 1.20.1-6ubuntu2.7 | krb5-pkinit 1.20.1-6ubuntu2.7 | Jun 11, 2026 |
| krb5-pkinit · Ubuntu 26.04.1 LTS (resolute) | 1.22.1-2ubuntu4.1 | krb5-pkinit 1.22.1-2ubuntu4.1 | Jun 11, 2026 |
| krb5-pkinit · amzn 2023 | 1.21.3-8.amzn2023.0.1 | ALAS2023-2026-1939 | Jul 20, 2026 |
| krb5-pkinit-debuginfo · amzn 2023 | 1.21.3-8.amzn2023.0.1 | ALAS2023-2026-1939 | Jul 20, 2026 |
| krb5-server · amzn 2023 | 1.21.3-8.amzn2023.0.1 | ALAS2023-2026-1939 | Jul 20, 2026 |
| krb5-server-debuginfo · amzn 2023 | 1.21.3-8.amzn2023.0.1 | ALAS2023-2026-1939 | Jul 20, 2026 |
| krb5-server-ldap · amzn 2023 | 1.21.3-8.amzn2023.0.1 | ALAS2023-2026-1939 | Jul 20, 2026 |
| krb5-server-ldap-debuginfo · amzn 2023 | 1.21.3-8.amzn2023.0.1 | ALAS2023-2026-1939 | Jul 20, 2026 |
| krb5-user · Ubuntu 22.04.1 LTS (jammy) | 1.19.2-2ubuntu0.8 | krb5-user 1.19.2-2ubuntu0.8 | Jun 11, 2026 |
| krb5-user · Ubuntu 24.04.5 LTS (noble) | 1.20.1-6ubuntu2.7 | krb5-user 1.20.1-6ubuntu2.7 | Jun 11, 2026 |
| krb5-user · Ubuntu 26.04.1 LTS (resolute) | 1.22.1-2ubuntu4.1 | krb5-user 1.22.1-2ubuntu4.1 | Jun 11, 2026 |
| krb5-workstation · amzn 2023 | 1.21.3-8.amzn2023.0.1 | ALAS2023-2026-1939 | Jul 20, 2026 |
| krb5-workstation-debuginfo · amzn 2023 | 1.21.3-8.amzn2023.0.1 | ALAS2023-2026-1939 | Jul 20, 2026 |
| libgssapi-krb5-2 · Ubuntu 22.04.1 LTS (jammy) | 1.19.2-2ubuntu0.8 | libgssapi-krb5-2 1.19.2-2ubuntu0.8 | Jun 11, 2026 |
| libgssapi-krb5-2 · Ubuntu 24.04.5 LTS (noble) | 1.20.1-6ubuntu2.7 | libgssapi-krb5-2 1.20.1-6ubuntu2.7 | Jun 11, 2026 |
| libgssapi-krb5-2 · Ubuntu 26.04.1 LTS (resolute) | 1.22.1-2ubuntu4.1 | libgssapi-krb5-2 1.22.1-2ubuntu4.1 | Jun 11, 2026 |
| libgssrpc4 · Ubuntu 22.04.1 LTS (jammy) | 1.19.2-2ubuntu0.8 | libgssrpc4 1.19.2-2ubuntu0.8 | Jun 11, 2026 |
| libgssrpc4t64 · Ubuntu 24.04.5 LTS (noble) | 1.20.1-6ubuntu2.7 | libgssrpc4t64 1.20.1-6ubuntu2.7 | Jun 11, 2026 |
| libgssrpc4t64 · Ubuntu 26.04.1 LTS (resolute) | 1.22.1-2ubuntu4.1 | libgssrpc4t64 1.22.1-2ubuntu4.1 | Jun 11, 2026 |
| libk5crypto3 · Ubuntu 22.04.1 LTS (jammy) | 1.19.2-2ubuntu0.8 | libk5crypto3 1.19.2-2ubuntu0.8 | Jun 11, 2026 |
| libk5crypto3 · Ubuntu 24.04.5 LTS (noble) | 1.20.1-6ubuntu2.7 | libk5crypto3 1.20.1-6ubuntu2.7 | Jun 11, 2026 |
| libk5crypto3 · Ubuntu 26.04.1 LTS (resolute) | 1.22.1-2ubuntu4.1 | libk5crypto3 1.22.1-2ubuntu4.1 | Jun 11, 2026 |
| libkadm5 · amzn 2023 | 1.21.3-8.amzn2023.0.1 | ALAS2023-2026-1939 | Jul 20, 2026 |
| libkadm5-debuginfo · amzn 2023 | 1.21.3-8.amzn2023.0.1 | ALAS2023-2026-1939 | Jul 20, 2026 |
| libkadm5clnt-mit12 · Ubuntu 22.04.1 LTS (jammy) | 1.19.2-2ubuntu0.8 | libkadm5clnt-mit12 1.19.2-2ubuntu0.8 | Jun 11, 2026 |
| libkadm5clnt-mit12 · Ubuntu 24.04.5 LTS (noble) | 1.20.1-6ubuntu2.7 | libkadm5clnt-mit12 1.20.1-6ubuntu2.7 | Jun 11, 2026 |
| libkadm5clnt-mit12 · Ubuntu 26.04.1 LTS (resolute) | 1.22.1-2ubuntu4.1 | libkadm5clnt-mit12 1.22.1-2ubuntu4.1 | Jun 11, 2026 |
| libkadm5srv-mit12 · Ubuntu 22.04.1 LTS (jammy) | 1.19.2-2ubuntu0.8 | libkadm5srv-mit12 1.19.2-2ubuntu0.8 | Jun 11, 2026 |
| libkadm5srv-mit12 · Ubuntu 24.04.5 LTS (noble) | 1.20.1-6ubuntu2.7 | libkadm5srv-mit12 1.20.1-6ubuntu2.7 | Jun 11, 2026 |
| libkadm5srv-mit12 · Ubuntu 26.04.1 LTS (resolute) | 1.22.1-2ubuntu4.1 | libkadm5srv-mit12 1.22.1-2ubuntu4.1 | Jun 11, 2026 |
| libkdb5-10 · Ubuntu 22.04.1 LTS (jammy) | 1.19.2-2ubuntu0.8 | libkdb5-10 1.19.2-2ubuntu0.8 | Jun 11, 2026 |
| libkdb5-10t64 · Ubuntu 24.04.5 LTS (noble) | 1.20.1-6ubuntu2.7 | libkdb5-10t64 1.20.1-6ubuntu2.7 | Jun 11, 2026 |
| libkdb5-10t64 · Ubuntu 26.04.1 LTS (resolute) | 1.22.1-2ubuntu4.1 | libkdb5-10t64 1.22.1-2ubuntu4.1 | Jun 11, 2026 |
| libkrad0 · Ubuntu 22.04.1 LTS (jammy) | 1.19.2-2ubuntu0.8 | libkrad0 1.19.2-2ubuntu0.8 | Jun 11, 2026 |
| libkrad0 · Ubuntu 24.04.5 LTS (noble) | 1.20.1-6ubuntu2.7 | libkrad0 1.20.1-6ubuntu2.7 | Jun 11, 2026 |
| libkrad0 · Ubuntu 26.04.1 LTS (resolute) | 1.22.1-2ubuntu4.1 | libkrad0 1.22.1-2ubuntu4.1 | Jun 11, 2026 |
| libkrb5-3 · Ubuntu 22.04.1 LTS (jammy) | 1.19.2-2ubuntu0.8 | libkrb5-3 1.19.2-2ubuntu0.8 | Jun 11, 2026 |
| libkrb5-3 · Ubuntu 24.04.5 LTS (noble) | 1.20.1-6ubuntu2.7 | libkrb5-3 1.20.1-6ubuntu2.7 | Jun 11, 2026 |
| libkrb5-3 · Ubuntu 26.04.1 LTS (resolute) | 1.22.1-2ubuntu4.1 | libkrb5-3 1.22.1-2ubuntu4.1 | Jun 11, 2026 |
| libkrb5support0 · Ubuntu 22.04.1 LTS (jammy) | 1.19.2-2ubuntu0.8 | libkrb5support0 1.19.2-2ubuntu0.8 | Jun 11, 2026 |
| libkrb5support0 · Ubuntu 24.04.5 LTS (noble) | 1.20.1-6ubuntu2.7 | libkrb5support0 1.20.1-6ubuntu2.7 | Jun 11, 2026 |
| libkrb5support0 · Ubuntu 26.04.1 LTS (resolute) | 1.22.1-2ubuntu4.1 | libkrb5support0 1.22.1-2ubuntu4.1 | Jun 11, 2026 |
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