{"answers":{"affected":"2 open source packages ship an affected version, including seroval. It affects 1 product.","exploited":"There is no known exploitation of CVE-2026-23956 in the wild and no public exploit code.","fix":"Upgrade seroval to 1.4.1 or later.","what":"CVE-2026-23956 is a high-severity denial of service vulnerability in lxsmnsyc seroval, published on 22 Jan 2026. An attacker can exploit it over the internet without logging in, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2026-23956 and fix it if it is affected.\n\nWhat it is: CVE-2026-23956 is a high-severity denial of service vulnerability in lxsmnsyc seroval, published on 22 Jan 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.\nExploitation: There is no known exploitation of CVE-2026-23956 in the wild and no public exploit code.\n\nAffected packages and fixed versions:\n- seroval (npm): affected from 0.2.0; fixed in 1.4.1\n- seroval (npm): affected from 0.2.0; fixed in 1.4.1\n\nTask:\n1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.\n2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.\n3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.\n4. Run the tests and summarise what changed and why.\n5. If nothing in the project is affected, say so and change nothing.\n\nReference: https://insights.sbomify.com/CVE-2026-23956/ (Markdown: https://insights.sbomify.com/CVE-2026-23956/index.md)","id":"CVE-2026-23956","markdown":"https://insights.sbomify.com/CVE-2026-23956/index.md","name":"CVE-2026-23956","record":{"aliases":["GHSA-hx9m-jf43-8ffr"],"analysis":{"component_type":"library","fix_type":"upgrade","impacts":["denial_of_service"],"network_reachable":"yes","non_default_config":false,"product_category":"JavaScript serialization library","requires_auth":"none","summary":"Attackers can cause denial of service in applications using seroval by providing malicious RegExp patterns that exhaust memory or trigger catastrophic backtracking.","user_interaction":"not_required","vuln_class":"denial_of_service"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"GitHub_M","cpe":[{"product":"seroval","vendor":"lxsmnsyc"}],"cvss":{"score":7.5,"severity":"high","source":"cna","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","version":"3.1"},"cwes":[{"id":"CWE-1333","name":"Inefficient Regular Expression Complexity"}],"description":"seroval facilitates JS value stringification, including complex structures beyond JSON.stringify capabilities. In versions 0.2.0 through 1.4.0, overriding RegExp serialization with extremely large patterns can exhaust JavaScript runtime memory during deserialization. Additionally, overriding RegExp serialization with patterns that trigger catastrophic backtracking can lead to ReDoS (Regular Expression Denial of Service). This issue has been fixed in version 1.4.1.","ecosystems":["npm"],"exploits":{"exploitdb":0,"first_seen":null,"github_poc":0,"max_poc_stars":null,"metasploit":0,"nuclei":0,"refs":[],"tier":"none_known"},"has_fix":true,"headline":"seroval affected by Denial of Service via RegExp serialization","id":"CVE-2026-23956","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"npm","product":null,"products":[],"type":"denial_of_service","year":"2026"},"n_packages":2,"n_references":3,"next":{"headline":"seroval is vulnerable to Denial of Service via array serialization","id":"CVE-2026-23957"},"packages":[{"ecosystem":"npm","fixed":["1.4.1"],"introduced":["0.2.0"],"last_affected":[],"package":"seroval","purl":null,"source":"GHSA-hx9m-jf43-8ffr"},{"ecosystem":"npm","fixed":["1.4.1"],"introduced":["0.2.0"],"last_affected":[],"package":"seroval","purl":"pkg:npm/seroval","source":"GHSA-hx9m-jf43-8ffr"}],"prev":{"headline":"EVerest vulnerable to concatenation of strings literal and integers","id":"CVE-2026-23955"},"products":["seroval"],"published":"2026-01-22","related":[{"cvss_score":7.5,"headline":"seroval is vulnerable to Denial of Service via array serialization","id":"CVE-2026-23957","kev_date_added":null,"published":"2026-01-22"},{"cvss_score":7.5,"headline":"Seroval affected by Denial of Service via Deeply Nested Objects","id":"CVE-2026-24006","kev_date_added":null,"published":"2026-01-22"},{"cvss_score":7.5,"headline":"seroval Affected by Remote Code Execution via JSON Deserialization","id":"CVE-2026-23737","kev_date_added":null,"published":"2026-01-21"},{"cvss_score":7.3,"headline":"seroval Affected by Prototype Pollution via JSON Deserialization","id":"CVE-2026-23736","kev_date_added":null,"published":"2026-01-21"}],"sources":[{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"class":"attribution","licence":"CC BY 4.0","name":"GitHub Advisory Database","prefix":"GHSA"},{"class":"attribution","licence":"US public information, NVD API terms","name":"NVD"},{"class":"attribution","licence":"CWE Terms of Use","name":"CWE (MITRE)"},{"class":"attribution","licence":"FIRST CVSS licence","name":"CVSS (FIRST)"}],"ssvc":{"automatable":"yes","exploitation":"none","technical_impact":"partial"},"state":"PUBLISHED","updated":"2026-05-20","vendors":["lxsmnsyc"]},"summary":"Attackers can cause denial of service in applications using seroval by providing malicious RegExp patterns that exhaust memory or trigger catastrophic backtracking.","url":"https://insights.sbomify.com/CVE-2026-23956/"}