CVE-2026-3591— A stack use-after-return flaw in SIG(0) handling code may enable ACL bypass
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I. Basic Information for CVE-2026-3591
Vulnerability Information
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Vulnerability Title
A stack use-after-return flaw in SIG(0) handling code may enable ACL bypass
Source: NVD (National Vulnerability Database)
Vulnerability Description
A use-after-return vulnerability exists in the `named` server when handling DNS queries signed with SIG(0). Using a specially-crafted DNS request, an attacker may be able to cause an ACL to improperly (mis)match an IP address. In a default-allow ACL (denying only specific IP addresses), this may lead to unauthorized access. Default-deny ACLs should fail-secure. This issue affects BIND 9 versions 9.20.0 through 9.20.20, 9.21.0 through 9.21.19, and 9.20.9-S1 through 9.20.20-S1. BIND 9 versions 9.18.0 through 9.18.46 and 9.18.11-S1 through 9.18.46-S1 are NOT affected.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N
Source: NVD (National Vulnerability Database)
Vulnerability Type
返回栈上的变量地址
Source: NVD (National Vulnerability Database)
Vulnerability Title
ISC BIND 9 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
ISC BIND 9是ISC组织的一个域名系统软件。 ISC BIND 9 9.20.0至9.20.20版本、9.21.0至9.21.19版本和9.20.9-S1至9.20.20-S1版本存在安全漏洞，该漏洞源于处理使用SIG(0)签名的DNS查询时存在释放后重用，可能导致访问控制列表错误匹配IP地址。
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
II. Public POCs for CVE-2026-3591
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Same Patch Batch · ISC · 2026-03-25 · 5 CVEs total
| CVE-2026-3608 | 7.5 HIGH | Stack overflow in Kea daemons |
| CVE-2026-3104 | 7.5 HIGH | Memory leak in code preparing DNSSEC proofs of non-existence |
| CVE-2026-1519 | 7.5 HIGH | Excessive NSEC3 iterations cause high CPU load during insecure delegation validation |
| CVE-2026-3119 | 6.5 MEDIUM | Authenticated query containing a TKEY record may cause named to terminate unexpectedly |
IV. Related Vulnerabilities
Same product: BIND 9
- CVE-2026-3119
Authenticated query containing a TKEY record may cause named - CVE-2026-3104
Memory leak in code preparing DNSSEC proofs of non-existence - CVE-2026-1519
Excessive NSEC3 iterations cause high CPU load during insecu - CVE-2025-13878
Malformed BRID/HHIT records can cause named to terminate une - CVE-2025-40780
Cache poisoning due to weak PRNG
Same vendor: ISC
- CVE-2026-3119
Authenticated query containing a TKEY record may cause named - CVE-2026-3104
Memory leak in code preparing DNSSEC proofs of non-existence - CVE-2026-1519
Excessive NSEC3 iterations cause high CPU load during insecu - CVE-2026-3608
Stack overflow in Kea daemons - CVE-2025-13878
Malformed BRID/HHIT records can cause named to terminate une
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