NPM: protobufjs: Denial of Service via infinite loop in .proto option parsing

NPM: protobufjs: Denial of Service via infinite loop in .proto option parsing vulnerability discovered by ? in WordPress Npm protobufjs versions = 7.5.0, = 7.6.4...

GHSA-J3F2-48V5-CCWW protobufjs: Denial of Service via infinite loop in .proto option parsing

Summary protobufjs parsed option names by advancing through schema tokens until it reached an = token, without checking for end of input. A crafted .proto schema that opens an option declaration but ends prematurely could cause the option parser to loop without ever terminating. This affects the...

CVE-2026-59876

A flaw was found in protobufjs. The Text Format extension, responsible for compiling protobuf definitions into JavaScript functions, improperly parsed string-keyed map entries. This allowed a specially crafted map entry with the key proto to modify the prototype of the returned map object. An...

protobufjs: protobufjs: Arbitrary code execution due to unsafe expression generation from crafted protobuf descriptors

A flaw was found in protobufjs, a library used to compile protobuf definitions into JavaScript functions. A remote attacker could exploit this vulnerability by providing a crafted descriptor that includes a non-string default value for a bytes field. This could lead to the generation of an unsafe...

@forwardimpact/libcodegen (>=0.1.47, <=0.1.52) potentially affected by CVE-2026-59876 via protobufjs-cli (2.0.1)

protobufjs-cli NPM version 2.0.1 is affected by a known vulnerability. The following packages have a transitive dependency on protobufjs-cli and may be impacted: - @forwardimpact/libcodegen =0.1.47, =0.1.52 Source cves: CVE-2026-59876 Source advisory: SNYK:JS-PROTOBUFJSCLI-17900555...

@agentgate-hedera/passport (>=0.1.1, <=0.1.3), @aliceo2/bookkeeping (1.19.0) +116 more potentially affected by CVE-2026-59876 via protobufjs (>=8.2.0, <=8.6.4)

protobufjs NPM version =8.2.0, =0.1.1, =1.16.0, =1.0.5, =0.0.4, =0.0.4, =0.0.4, =0.0.4, =0.1.37, =0.1.29, =9.1.1-az29, =9.1.1-az31 - @freon4dsl/core 3.0.0-beta.1 - @freon4dsl/core-svelte 3.0.0-beta.1 and more Source cves: CVE-2026-59876 Source advisory: SNYK:JS-PROTOBUFJS-17900554...

Prototype Pollution

Overview protobufjs-cli is a Translates between file formats and generates static code as well as TypeScript definitions. Affected versions of this package are vulnerable to Prototype Pollution through the textformat file. An attacker can modify the prototype of the returned map object by supplyi...

Prototype Pollution

Overview Affected versions of this package are vulnerable to Prototype Pollution through the textformat file. An attacker can modify the prototype of the returned map object by supplying a specially crafted map entry with the key proto. Note: This is only exploitable if the target schema contains...

Prototype Pollution

Overview protobufjs is a protocol buffer for JavaScript & TypeScript. Affected versions of this package are vulnerable to Prototype Pollution through the textformat file. An attacker can modify the prototype of the returned map object by supplying a specially crafted map entry with the key proto...

Infinite loop

Overview protobufjs is a protocol buffer for JavaScript & TypeScript. Affected versions of this package are vulnerable to Infinite loop in the option parsing. An attacker can cause the application to enter an infinite loop by submitting a crafted .proto schema that opens an option declaration and...

@abstraxn/signer-react (>=2.0.2, <=3.3.3), @account-kit/react (>=4.53.1-alpha.0, <=4.88.5) +685 more potentially affected by CVE-2026-59877 via protobufjs (>=7.5.0, <=7.6.4)

protobufjs NPM version =7.5.0, =2.0.2, =4.53.1-alpha.0, =4.15.0, =3.26.0, =0.1.0, =1.9.1, =2.1.7-alpha-2, =0.1.0, =1.0.0-canary.15, =0.0.2, =0.0.1, =0.0.0-experimental-02e44603-20260603, =0.0.0-experimental-02e44603-20260603, =0.28.2-next.0 and more Source cves: CVE-2026-59877 Source advisory:...

@0xchain/telemetry (>=1.1.0-beta.8, <=1.1.0-beta.18), @20206205tech/nestjs-common (>=0.8.0, <=0.11.3) +1136 more potentially affected by CVE-2026-59877 via protobufjs (>=8.0.0, <=8.6.5)

protobufjs NPM version =8.0.0, =1.1.0-beta.8, =0.8.0, =1.0.0, =1.1.4, =0.3.1, =0.3.1, =0.7.1, =0.7.0, =0.8.0 and more Source cves: CVE-2026-59877 Source advisory: SNYK:JS-PROTOBUFJS-17900550...

Infinite loop

Overview Affected versions of this package are vulnerable to Infinite loop in the option parsing. An attacker can cause the application to enter an infinite loop by submitting a crafted .proto schema that opens an option declaration and ends prematurely. Remediation Upgrade...

CVE-2026-59876

protobufjs compiles protobuf definitions into JavaScript JS functions. From 8.2.0 until 8.6.5, the protobufjs Text Format extension parsed string-keyed map entries using ordinary property assignment, allowing a map entry with key proto to change the prototype of the returned map object instead of...

CVE-2026-59877

protobufjs compiles protobuf definitions into JavaScript JS functions. Prior to 7.6.5 and 8.6.6, protobufjs parsed option names by advancing through schema tokens until reaching an = token without checking for end of input, so a crafted .proto schema that opens an option declaration and ends...

CVE-2026-59876 protobufjs: Text Format string map parsing can mutate returned map object prototype

protobufjs compiles protobuf definitions into JavaScript JS functions. From 8.2.0 until 8.6.5, the protobufjs Text Format extension parsed string-keyed map entries using ordinary property assignment, allowing a map entry with key proto to change the prototype of the returned map object instead of...

CVE-2026-59876

protobufjs compiles protobuf definitions into JavaScript JS functions. From 8.2.0 until 8.6.5, the protobufjs Text Format extension parsed string-keyed map entries using ordinary property assignment, allowing a map entry with key proto to change the prototype of the returned map object instead of...

CVE-2026-59876

CVE-2026-59876 affects protobufjs (Text Format extension) where, from 8.2.0 through 8.6.5, string-keyed map entries were parsed via ordinary property assignment, allowing a map entry with key proto to mutate the prototype of the returned map instead of creating an own entry in protobufjs/ext/text...

CVE-2026-59876 protobufjs: Text Format string map parsing can mutate returned map object prototype

protobufjs compiles protobuf definitions into JavaScript JS functions. From 8.2.0 until 8.6.5, the protobufjs Text Format extension parsed string-keyed map entries using ordinary property assignment, allowing a map entry with key proto to change the prototype of the returned map object instead of...

CVE-2026-59876 protobufjs: Text Format string map parsing can mutate returned map object prototype

protobufjs compiles protobuf definitions into JavaScript JS functions. From 8.2.0 until 8.6.5, the protobufjs Text Format extension parsed string-keyed map entries using ordinary property assignment, allowing a map entry with key proto to change the prototype of the returned map object instead of...