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    CVE-2026-88388

    Espruino 2v29 (commit bffc6d0) contains a stack-based buffer overflow vulnerability in the JavaScript error stack-trace handling path on 64-bit builds. A remote attacker can supply JavaScript input that triggers an exception and reaches jslPrintTokenLineMarker(), which passes the address of a 4-byte int column variable to jsvGetLineAndCol() as a size_t pointer. jsvGetLineAndCol() performs an 8-byte write through the mismatched pointer, overwriting adjacent stack memory.

    Published:Sep 24, 2026
    Last Modified:Sep 26, 2026
    EPS:Sep 24, 2026
    EPSS Score:0.00171
    CVSS Score:7.5

    Affected Products

    Vendor
    Espruino
    Product
    Espruino

    Exploits

    No exploit reference

    Common Weakness Enumeration

    CWE-121 Stack-based Buffer Overflow

    Common Attack Pattern Enumeration and Classification (CAPEC)

    No CAPEC recorded yet

    Related CVEs

    CVE-2026-88389 (CVSS 6.2) — Espruino 2v29 (commit bffc6d0) contains a NULL pointer dereference vulnerability in jslGetRawString() in src/j…
    CVE-2026-88390 (CVSS 7.7) — An out-of-bounds write vulnerability in jslGetTokenValueAsString() in Espruino 2v29 (commit bffc6d0) allows cr…
    CVE-2024-25200 (CVSS 7.5) — Espruino 2v20 (commit fcc9ba4) was discovered to contain a Stack Overflow via the jspeFactorFunctionCall at sr…
    CVE-2024-25201 (CVSS 7.5) — Espruino 2v20 (commit fcc9ba4) was discovered to contain an Out-of-bounds Read via jsvStringIteratorPrintfCall…
    CVE-2020-19693 (CVSS 9.8) — An issue found in Espruino Espruino 6ea4c0a allows an attacker to execute arbitrrary code via oldFunc paramete…
    CVE-2020-23257 (CVSS 7.5) — Buffer Overflow vulnerability found in Espruino 2v05.41 allows an attacker to cause a denial of service via th…
    CVE-2022-25044 (CVSS 7.8) — Espruino 2v11.251 was discovered to contain a stack buffer overflow via src/jsvar.c in jsvNewFromString.…
    CVE-2022-25465 (CVSS 7.8) — Espruino 2v11 release was discovered to contain a stack buffer overflow via src/jsvar.c in jsvGetNextSibling.…
    CVE-2021-46325 (CVSS 7.8) — Espruino 2v10.246 was discovered to contain a stack buffer overflow via src/jsutils.c in vcbprintf.…
    CVE-2021-46324 (CVSS 7.8) — Espruino 2v11.251 was discovered to contain a stack buffer overflow via src/jsvar.c in jsvNewFromString.…

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High