QSearchQSearch

CVE-2026-11850

5.0 MEDIUM

An integer underflow vulnerability was found in MIT krb5 in the berval2tl_data() function in plugins/kdb/ldap/libkdb_ldap/ldap_principal2.c

Published: 2026-06-11 · Last updated: 2026-06-11

Severity and scoring

CVSS
5.0 MEDIUM
Vector
CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:L/I:N/A:H
CWE
CWE-191

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

References

Related CVEs

Same CWE

  • CVE-2026-42542 — TDengine is an open source, time-series database optimized for Internet of Things devices (7.5 HIGH)
  • CVE-2026-42326 — ImageMagick is free and open-source software used for editing and manipulating digital images (5.1 MEDIUM)
  • CVE-2026-45469 — Integer underflow (wrap or wraparound) in Microsoft Office Excel allows an unauthorized attacker to execute code locally (7.8 HIGH)
  • CVE-2026-45463 — Heap-based buffer overflow in Microsoft Office allows an unauthorized attacker to execute code locally (8.4 HIGH)
  • CVE-2026-42981 — Integer underflow (wrap or wraparound) in Windows Performance Monitor allows an unauthorized attacker to execute code over a network (8.1 HIGH)