SB2026091609 - Multiple vulnerabilities in IBM Rational Developer for i
Published: September 16, 2026
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 17 vulnerabilities.
1) Uncontrolled Recursion (CVE-ID: CVE-2026-13506)
CWE-ID: CWE-674 - Uncontrolled Recursion
CVSSv4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to improper state management in the lazy ASN.1 sequence parser when forcing sequence evaluation that resets the nesting-depth guard. A remote attacker can supply crafted ASN.1 data to cause a denial of service.
2) Inadequate Encryption Strength (CVE-ID: CVE-2026-59651)
CWE-ID: CWE-326 - Inadequate Encryption Strength
CVSSv4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N]
The vulnerability allows a remote attacker to bypass keystore integrity protection.
The vulnerability exists due to weak cryptographic key strength in BKS keystore version handling when accepting a legacy version with a 16-bit integrity MAC key. A remote attacker can supply a crafted legacy keystore to bypass keystore integrity protection.
3) Incorrect calculation (CVE-ID: CVE-2025-14813)
CWE-ID: CWE-682 - Incorrect Calculation
CVSSv4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N]
The vulnerability allows a remote attacker to cause cryptographic operations to fail.
The vulnerability exists due to improper implementation in G3413CTRBlockCipher when encrypting or decrypting more than 255 blocks. A remote attacker can supply data that exceeds this limit to cause cryptographic operations to fail.
The issue affects the GOST-R-3413-2015 CTR mode implementation because it uses a single-byte counter instead of a counter size aligned with the algorithm definition.
4) LDAP injection (CVE-ID: CVE-2026-0636)
CWE-ID: CWE-90 - Improper Neutralization of Special Elements used in an LDAP Query ('LDAP Injection')
CVSSv4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N]
The vulnerability allows a remote attacker to manipulate LDAP queries.
The vulnerability exists due to improper neutralization of special elements used in an LDAP query in LDAPStoreHelper when processing user-supplied input for LDAP queries. A remote attacker can supply crafted input to manipulate LDAP queries.
This issue is associated with the prov modules.
5) Uncontrolled Memory Allocation (CVE-ID: CVE-2026-12185)
CWE-ID: CWE-789 - Uncontrolled Memory Allocation
CVSSv4: 6.7 [CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to uncontrolled memory allocation in the BKS/UBER keystore parser when allocating from untrusted lengths before integrity check. A remote attacker can supply a crafted keystore file to cause a denial of service.
6) Improper Verification of Cryptographic Signature (CVE-ID: CVE-2026-12803)
CWE-ID: CWE-347 - Improper Verification of Cryptographic Signature
CVSSv4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N]
The vulnerability allows a remote attacker to forge authenticated ciphertexts across nonces.
The vulnerability exists due to improper cryptographic binding in KCCMBlockCipher MAC processing when AAD is absent. A remote attacker can craft data that exploits the missing nonce binding to forge authenticated ciphertexts across nonces.
7) Improper Verification of Cryptographic Signature (CVE-ID: CVE-2026-12816)
CWE-ID: CWE-347 - Improper Verification of Cryptographic Signature
CVSSv4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N]
The vulnerability allows a remote attacker to forge message authentication codes.
The vulnerability exists due to improper cryptographic implementation in IESEngine stream-mode MAC processing when deriving keys through a length-dependent KDF split. A remote attacker can supply crafted input to forge message authentication codes.
8) Improper Verification of Cryptographic Signature (CVE-ID: CVE-2026-12860)
CWE-ID: CWE-347 - Improper Verification of Cryptographic Signature
CVSSv4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N]
The vulnerability allows a remote attacker to bypass RSA PKCS#1 signature verification.
The vulnerability exists due to improper signature verification in RSA PKCS#1 verification when processing the NULL-omitted path. A remote attacker can provide a crafted signature to bypass RSA PKCS#1 signature verification.
9) LDAP injection (CVE-ID: CVE-2026-59652)
CWE-ID: CWE-90 - Improper Neutralization of Special Elements used in an LDAP Query ('LDAP Injection')
CVSSv4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N]
The vulnerability allows a remote attacker to inject arbitrary LDAP filter elements.
The vulnerability exists due to LDAP injection in the legacy jdk1.4 LDAPStoreHelper when constructing LDAP filters from untrusted input. A remote attacker can supply crafted input to inject arbitrary LDAP filter elements.
10) Uncontrolled Memory Allocation (CVE-ID: CVE-2026-14682)
CWE-ID: CWE-789 - Uncontrolled Memory Allocation
CVSSv4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to uncontrolled memory allocation in definite-length read processing when performing an unbounded up-front allocation. A remote attacker can supply crafted input with a large declared length to cause a denial of service.
11) Improper Certificate Validation (CVE-ID: CVE-2026-8763)
CWE-ID: CWE-295 - Improper Certificate Validation
CVSSv4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N]
The vulnerability allows a remote attacker to bypass name constraints validation.
The vulnerability exists due to improper certificate validation in name constraints processing when handling rfc822Name and URI values with a trailing dot. A remote attacker can supply a crafted identifier to bypass name constraints validation.
12) Resource exhaustion (CVE-ID: CVE-2026-15055)
CWE-ID: CWE-400 - Resource exhaustion
CVSSv4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to uncontrolled resource consumption in PKCS#8 / PBES2 decryptor KDF processing when honoring an unbounded cost from input. A remote attacker can supply crafted encrypted input to cause a denial of service.
13) Covert Timing Channel (CVE-ID: CVE-2026-5598)
CWE-ID: CWE-385 - Covert Timing Channel
CVSSv4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N]
The vulnerability allows a remote attacker to disclose sensitive information.
The vulnerability exists due to a covert timing channel in FrodoEngine.java in the BC-JAVA core modules when performing cryptographic operations. A remote attacker can measure timing differences to disclose sensitive information.
14) Uncontrolled Memory Allocation (CVE-ID: CVE-2026-58060)
CWE-ID: CWE-789 - Uncontrolled Memory Allocation
CVSSv4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to uncontrolled memory allocation in HSS public-key verification when processing an unbounded level count. A remote attacker can provide a crafted public key to cause a denial of service.
15) Improper Certificate Validation (CVE-ID: CVE-2026-58062)
CWE-ID: CWE-295 - Improper Certificate Validation
CVSSv4: 8.8 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:H/VA:N/SC:N/SI:N/SA:N]
The vulnerability allows a remote attacker to bypass certificate status validation.
The vulnerability exists due to improper certificate validation in stapled OCSP response processing when accepting a response without binding it to the checked certificate. A remote attacker can supply a crafted stapled OCSP response to bypass certificate status validation.
16) Resource exhaustion (CVE-ID: CVE-2026-58063)
CWE-ID: CWE-400 - Resource exhaustion
CVSSv4: 6.7 [CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to uncontrolled resource consumption in BCFKS keystore load KDF processing when honoring an unbounded cost from an untrusted file. A remote attacker can supply a crafted keystore file to cause a denial of service.
17) Resource exhaustion (CVE-ID: CVE-2026-13586)
CWE-ID: CWE-400 - Resource exhaustion
CVSSv4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to uncontrolled resource consumption in PKCS#12 MAC and bag-decryption KDF processing when handling an excessive iteration count from input. A remote attacker can supply crafted PKCS#12 data to cause a denial of service.
Remediation
Install update from vendor's website.