CVE-2026-115754: Serialize JavaScript: Cross-site scripting (XSS) via unescaped </script at the end of a serialized function body
Vulnerability summary
CVE-2026-115754 is a low (CVSS 2.1) vulnerability in yahoo serialize-javascript. EPSS estimates a 0.23% chance of exploitation in the next 30 days, higher than 14% of scored vulnerabilities.
Not severe (CVSS 2.1, network access); no exploitation reported by the 5 checked sources
Source freshness unavailable
How is this decided?Timeline
- 23-10-2026PublishedVulnerability first disclosed.
- 26-10-2026Last modifiedVulnerability information updated.
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 metrics
8 scores · 7 sources · 2 versions- NVDNIST2.1LowCVSS: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
- OSV · NpmEcosystem advisory · calculated2.1LowCVSS:4.0/AV:N/AC:H/AT:P/PR:L/UI:P/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N
- OSV · DebianEcosystem advisory · calculated2.3LowCVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:N/VI:N/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:XDiffers
- OSV · WolfiEcosystem advisory · calculated2.1LowCVSS:4.0/AV:N/AC:H/AT:P/PR:L/UI:P/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N
- OSV · ChainguardEcosystem advisory · calculated2.1LowCVSS:4.0/AV:N/AC:H/AT:P/PR:L/UI:P/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N
- OSV · UbuntuEcosystem advisory · calculated2.3LowCVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:NDiffers
EPSS trend
Probability
0.23%
Chance of exploitation in the next 30 days
Percentile
14%
Versus all other CVEs
30-day change
Change unavailable
Change unavailable
Known exploited
Compare KEV catalogs
CISA KEVNot in the CISA KEV catalog.
ENISA CNWNot in the ENISA CNW catalog.
CIRCLNot in the CIRCL catalog.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Known conditions: network-reachable, low-privilege account, user interaction (CVSS vector). Other conditions: not stated in public data.
Chainguard39 products
- airflow-2All versions (No fix recorded)
- airflow-core-2All versions (No fix recorded)
- arangodb-3.11All versions (No fix recorded) | < 3.11.14.6-r3
- arangodb-3.12All versions (No fix recorded)
- argo-workflows-ui-3.7All versions (No fix recorded) | < 3.7.18-r14
Wolfi3 products
- argo-workflows-ui-4.0All versions (No fix recorded) | < 4.0.15-r1
- opensearch-dashboards-3All versions (No fix recorded) | < 3.9.0-r5
- tileserver-glAll versions (No fix recorded) | < 5.7.0-r1
Debian1 product
- node-serialize-javascriptAll versions (No fix recorded) | < 7.1.4+~5.0.4-1
Npm1 product
- serialize-javascript< 7.1.3
Ubuntu1 product
- node-serialize-javascriptAll versions (No fix recorded)
Yahoo1 product
- serialize-javascript< 7.1.3
6 vendors · 46 products
References
11 links- github.com/yahoo/serialize-javascript/security/advisories/GHSA-m5mm-p8h7-m29vVendor AdvisoryWEBAdvisoryX Refsource CONFIRMREPORT
- github.com/yahoo/serialize-javascript/commit/2864b3c6260a3bfd52d2db3e70d1a079de108a61PatchWEBFIXX Refsource MISCREPORT
