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CVE-2026-114116 vyperlang CVE debrief

AI-assisted PatchSiren debrief based on the supplied source corpus. The CVE record was published on 2026-10-21T00:37:13.988Z and has not been modified since then. This vulnerability affects Vyper versions 0.1.0b1 through 0.5.0b1, allowing for literal value manipulation via line separators. Defenders should assess exposure and prioritize verification and potential remediation. The vulnerability enables attackers to hide characters like form feed and U+2028 as line breaks the Python parser ignores, silently changing address, integer or decimal constants.

Vendor
vyperlang
Product
vyper
CVSS
MEDIUM 6
CISA KEV
Not listed in stored evidence
Original CVE published
2026-10-21
Original CVE updated
2026-10-28
Advisory published
2026-10-21
Advisory updated
2026-10-28

Who should care

Defenders responsible for Vyper-based systems, particularly those using versions 0.1.0b1 through 0.5.0b1, should assess exposure and prioritize verification and potential remediation.

Why it matters

CVE-2026-114116 is a vulnerability in Vyper versions 0.1.0b1 through 0.5.0b1 that allows for literal value manipulation via line separators. Defenders should prioritize verification and potential remediation to prevent potential exploitation.

  • Verification of Vyper versions 0.1.0b1 through 0.5.0b1 is necessary to prevent potential literal value manipulation.
  • Defenders should review and update Vyper configurations to prevent potential exploitation.
  • Monitoring for suspicious activity or anomalies in Vyper-based systems is recommended.

Technical summary

Vyper versions 0.1.0b1 through 0.5.0b1 are vulnerable to literal value manipulation via line separators. An attacker contributing source code can hide characters like form feed and U+2028 as line breaks the Python parser ignores, silently changing address, integer or decimal constants. This vulnerability affects the way Vyper builds its source-line table with str.splitlines(). Defenders should prioritize verifying Vyper versions and configurations to prevent potential exploitation. The vulnerability does not provide explicit details on how to exploit but indicates a risk of silent constant changes.

Defensive priority

Defenders should prioritize verifying Vyper versions 0.1.0b1 through 0.5.0b1 for potential literal value manipulation via line separators.

Recommended defensive actions

  • Verify Vyper versions 0.1.0b1 through 0.5.0b1 for potential literal value manipulation via line separators.
  • Check for and apply vendor-provided patches or updates.
  • Monitor for suspicious activity or anomalies in Vyper-based systems.
  • Review and update Vyper configurations to prevent potential exploitation.
  • Perform asset inventory of Vyper-based systems.
  • Implement compensating controls for exposed systems.
  • Track exceptions and retest remediated assets.

Evidence notes

The CVE record and source item provide details on the vulnerability in Vyper versions 0.1.0b1 through 0.5.0b1. The NVD entry is currently UNCLASSIFIED. Evidence is limited to CVE Program and NVD records. Defenders should verify Vyper versions, review configurations, and monitor for suspicious activity. The vulnerability allows for literal value manipulation via line separators, potentially affecting address, integer, or decimal constants.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-114116 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-114116

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-114116 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-114116

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

  • Vyper through 0.5.0b1 Literal Value Manipulation via Line Separators

    Unverified legacy reference

    URL: https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/114xxx/CVE-2026-114116.json

    cve_program_cvelist_v5

  • Source reference

    Unverified legacy reference

    URL: https://github.com/vyperlang/vyper/security/advisories/GHSA-wvx7-39qj-2g9v

    Supplemental source - vendor-advisory

  • Source reference

    Unverified legacy reference

    URL: https://www.vulncheck.com/advisories/vyper-through-0.5-0b1-literal-value-manipulation-via-line-separators

    Supplemental source - third-party-advisory

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.