CVE-2026-40198 | STIGTSP Net::CIDR::Lite up to 0.22 on Perl _pack_ipv6 improper validation of syntactic correctness of input

VDB-356957 · CVE-2026-40198 · GCVE-0-2026-40198 STIGTSP NET::CIDR::LITE UP TO 0.22 ON PERL _PACK_IPV6 IMPROPER VALIDATION OF SYNTACTIC CORRECTNESS OF INPUT HISTORYDIFFRELATEJSONXMLCTI CVSS Meta Temp Score Current Exploit Price (≈) CTI Interest Score 7.0 $0-$5k 0.13 Summaryinfo A vulnerability classified as critical has been found in STIGTSP Net::CIDR::Lite up to 0.22 on Perl. The impacted element is the function _pack_ipv6. The manipulation leads to improper validation of syntactic correctness of input. This vulnerability is uniquely identified as CVE-2026-40198. The attack is possible to be carried out remotely. No exploit exists. It is recommended to upgrade the affected component. Detailsinfo A vulnerability was found in STIGTSP Net::CIDR::Lite up to 0.22 on Perl. It has been rated as critical. This issue affects the function _pack_ipv6. The manipulation with an unknown input leads to a improper validation of syntactic correctness of input vulnerability. Using CWE to declare the problem leads to CWE-1286. The product receives input that is expected to be well-formed - i.e., to comply with a certain syntax - but it does not validate or incorrectly validates that the input complies with the syntax. Impacted is confidentiality, integrity, and availability. The summary by CVE is: Net::CIDR::Lite versions before 0.23 for Perl does not validate IPv6 group count, which may allow IP ACL bypass. _pack_ipv6() does not check that uncompressed IPv6 addresses (without ::) have exactly 8 hex groups. Inputs like "abcd", "1:2:3", or "1:2:3:4:5:6:7" are accepted and produce packed values of wrong length (3, 7, or 15 bytes instead of 17). The packed values are used internally for mask and comparison operations. find() and bin_find() use Perl string comparison (lt/gt) on these values, and comparing strings of different lengths gives wrong results. This can cause find() to incorrectly report an address as inside or outside a range. Example: my $cidr = Net::CIDR::Lite->new("::/8"); $cidr->find("1:2:3"); # invalid input, incorrectly returns true This is the same class of input validation issue as CVE-2021-47154 (IPv4 leading zeros) previously fixed in this module. See also CVE-2026-40199, a related issue in the same function affecting IPv4 mapped IPv6 addresses. The advisory is shared at github.com. The identification of this vulnerability is CVE-2026-40198 since 04/10/2026. The exploitation is known to be easy. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. Technical details are known, but no exploit is available. Upgrading to version 0.23 eliminates this vulnerability. Applying the patch 25d65f85dbe4885959a10471725ec9d250a589c3 is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version. Productinfo Vendor STIGTSP Name Net::CIDR::Lite Version 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 0.10 0.11 0.12 0.13 0.14 0.15 0.16 0.17 0.18 0.19 0.20 0.21 0.22 License open-source CPE 2.3info 🔒 🔒 🔒 CPE 2.2info 🔒 🔒 🔒 CVSSv4info VulDB Vector: 🔒 VulDB Reliability: 🔍 CVSSv3info VulDB Meta Base Score: 7.3 VulDB Meta Temp Score: 7.0 VulDB Base Score: 7.3 VulDB Temp Score: 7.0 VulDB Vector: 🔒 VulDB Reliability: 🔍 CVSSv2info Vector Complexity Authentication Confidentiality Integrity Availability Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock VulDB Base Score: 🔒 VulDB Temp Score: 🔒 VulDB Reliability: 🔍 Exploitinginfo Class: Improper validation of syntactic correctness of input CWE: CWE-1286 / CWE-20 CAPEC: 🔒 ATT&CK: 🔒 Physical: No Local: No Remote: Yes Availability: 🔒 Status: Not defined Price Prediction: 🔍 Current Price Estimation: 🔒 0-Day Unlock Unlock Unlock Unlock Today Unlock Unlock Unlock Unlock Threat Intelligenceinfo Interest: 🔍 Active Actors: 🔍 Active APT Groups: 🔍 Countermeasuresinfo Recommended: Upgrade Status: 🔍 0-Day Time: 🔒 Upgrade: Net::CIDR::Lite 0.23 Patch: 25d65f85dbe4885959a10471725ec9d250a589c3 Timelineinfo 04/10/2026 CVE reserved 04/11/2026 +1 days Advisory disclosed 04/11/2026 +0 days VulDB entry created 04/11/2026 +0 days VulDB entry last update Sourcesinfo Advisory: 25d65f85dbe4885959a10471725ec9d250a589c3 Status: Confirmed CVE: CVE-2026-40198 (🔒) GCVE (CVE): GCVE-0-2026-40198 GCVE (VulDB): GCVE-100-356957 Entryinfo Created: 04/11/2026 04:11 Changes: 04/11/2026 04:11 (58) Complete: 🔍 Cache ID: 99:88A:101 Discussion No comments yet. Languages: en. Please log in to comment. ◂ PreviousOverviewNext ▸