CVE-2026-115897
Serialize JavaScript: Cross-site scripting (XSS) via unescaped </script at the end of a serialized function body
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CVSS:4.0/AV:N/AC:H/AT:P/PR:L/UI:P/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
CVSS:4.0/AV:N/AC:H/AT:P/PR:L/UI:P/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N
Attack conditions and impact
Derived from the CNA (via NVD) CVSS 4.0 vector| Metric | Value | Meaning |
|---|---|---|
| Attack vector AV | N | Network |
| Attack complexity AC | H | High (conditions required) |
| Attack requirements AT | P | Present |
| Privileges required PR | L | Regular user |
| User interaction UI | P | Passive |
| Confidentiality (vulnerable system) VC | L | Low |
| Integrity (vulnerable system) VI | L | Low |
| Availability (vulnerable system) VA | N | None |
| Confidentiality (subsequent systems) SC | L | Low |
| Integrity (subsequent systems) SI | L | Low |
| Availability (subsequent systems) SA | N | None |
CVSS:4.0/AV:N/AC:H/AT:P/PR:L/UI:P/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Description
Serialize JavaScript serializes JavaScript values to a superset of JSON that includes regular expressions and functions. Prior to 7.1.3, the function-source escaping logic does not neutralize a bare closing-script prefix when attacker-influenced function source text ends exactly at that prefix. Because each function body is escaped independently, a delimiter supplied by surrounding serialized output can terminate an HTML script element, and a later serialized value supplies injected markup that becomes a live element in the page. Exploitation requires control of a serialized function's source text, such as through a spoofed toString(). This issue is fixed in version 7.1.3.
CVSS assessments
| Provider | Version | Score | Vector |
|---|---|---|---|
| NVD / [email protected] (Secondary) | 4.0 | 2.1 LOW | CVSS:4.0/AV:N/AC:H/AT:P/PR:L/UI:P/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X |
| CNA / GitHub_M | 4.0 | 2.1 LOW | CVSS:4.0/AV:N/AC:H/AT:P/PR:L/UI:P/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N |
Affected products and packages
CNA (CVE.org)
| Vendor | Product | Versions |
|---|---|---|
| yahoo | serialize-javascript | affected: < 7.1.3 |
Open-source packages (GitHub Advisory / OSV)
Serialize JavaScript: Cross-site scripting (XSS) via unescaped </script at the end of a serialized function body
| Ecosystem | Package | Affected versions | Fixed in |
|---|---|---|---|
| npm | serialize-javascript | < 7.1.3 | 7.1.3 |
Linux distribution status
Red Hat ↗ moderate
| Release | Package | Status | Fixed version / notes |
|---|---|---|---|
| Red Hat Hardened Images | dotnet10.0 | not affected | |
| Red Hat Hardened Images | dotnet8.0 | not affected | |
| Red Hat Hardened Images | dotnet9.0 | not affected | |
| Red Hat Hardened Images | grafana12.4 | affected | |
| Red Hat Hardened Images | grafana13.1 | not affected | |
| Red Hat Hardened Images | grafana13.2 | not affected | |
| Red Hat Hardened Images | prometheus3.13 | not affected |
Debian ↗
No record
Ubuntu ↗ Fetching
References (5)
- https://github.com/advisories/GHSA-m5mm-p8h7-m29v GHSA
- https://github.com/yahoo/serialize-javascript/commit/2864b3c6260a3bfd52d2db3e70d1a079de108a61 NVD, CNA, GHSA x_refsource_MISC
- https://github.com/yahoo/serialize-javascript/pull/235 NVD, CNA, GHSA x_refsource_MISC
- https://github.com/yahoo/serialize-javascript/releases/tag/v7.1.3 NVD, CNA, GHSA x_refsource_MISC
- https://github.com/yahoo/serialize-javascript/security/advisories/GHSA-m5mm-p8h7-m29v NVD, CNA, GHSA x_refsource_CONFIRM